CN1584346A - Shielding spiral conveyor hydraulic system with proportional feedback control and accumulator oil supplementary - Google Patents
Shielding spiral conveyor hydraulic system with proportional feedback control and accumulator oil supplementary Download PDFInfo
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- CN1584346A CN1584346A CN 200410025408 CN200410025408A CN1584346A CN 1584346 A CN1584346 A CN 1584346A CN 200410025408 CN200410025408 CN 200410025408 CN 200410025408 A CN200410025408 A CN 200410025408A CN 1584346 A CN1584346 A CN 1584346A
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Abstract
A hydraulic system of shield spiral conveying machine with ratio feedback control and energy storing device for oil supplement consists of a three-position and four-way solenoid change valve, a motor, a rotation sensor, a one-way valve, a liquid-controlled one-way valve, a throttle valve, a two-position and two-way solenoid reversal valve, a shift sensor, a hydraulic cylinder, a range switch, a stop ball valve, a unloading valve, an overflow valve and an energy storing device. The machine has a sensor to monitor rotation and makes variable pump controlled according soil cabin pressure so as to control soil discharge volume and to achieve a hydraulic control system of a continuous real time controllable spiral-conveying machine. The energy-storing device is used oil supplement to close exhaust outlet reliably when accident occurs to guarantee safety for tunnel engineering. The electric feedback and ratio feedback are used to control turbulence to soil body when shield tunneling and reduce settlement of earth surface. The machine can be adaptable for various strata reliably.
Description
Affiliated technical field
The present invention relates to fluid pressure actuator, relate in particular to the shield screw conveyer hydraulic system of a kind of Proportional Feedback control and accumulator repairing.
Background technique
The shield structure is a kind of technology-intensive Important Project equipment that is exclusively used in the subterranean tunnel engineering excavation.Under the shielding that can support circle that strata pressure can advance again or special shape steel tube structures such as rectangle and horse shoe shaped in the stratum, work such as it can be finished excavation, is unearthed, tunnel support.Its maximum characteristics be exactly whole tunnel excavating process all be under this is known as the shielding of steel structure of shield, to finish, can avoid to greatest extent caving in and surface deformable.Compare with traditional tunnel piercing technology, safe and reliable, advantages such as mechanization degree is high, good work environment, earth volume is few, progress is fast, construction cost is low that shield construction has, especially in geological condition complexity, level of ground water height and edpth of tunnel when big can only rely on the shield structure.
Modern shield structure control ground settlement and the fundamental sum effective method that reduces soil disturbance are to adopt pressure balance (mud-water balance and earth pressure balance) technology.Requirement is in time adjusted the amount of being unearthed according to the variation of working surface actual pressure, guarantees that working surface has proper supporting pressure.Method commonly used at present is by preestablishing native cabin internal pressure value to reach the purpose of good ground, adjusting according to the ground settlement situation in construction again, is that the soil pressure of a kind of " hysteresis formula " is corrected.Because the virtual stress more complicated of soil layer on the excavation face, this preestablish and the result that adjusts of lagging behind can make ground produce bigger protuberance or subsides, stratum effect stable and ground settlement control depends on workmen's experience to a great extent, and construction quality is difficult to guarantee.Therefore, the rotating speed of how adjusting screw conveyor in real time according to working surface soil pressure or surface deformable is the key technical problem that concerns the reliable driving of shield structure.
Screw conveyor is the important component part of shield structure, and the earth that it is mainly used to knife cutting be got off in the shield structure sealed compartment is discharged the shield body, keeps sealed compartment pressure simultaneously.Earth carries compression to form sealing soil plug by screw rod, forms certain resistance, can keep the sealed compartment internal pressure to be stabilized in the prespecified range.The effective means that keeps sealed compartment pressure and working surface water and soil pressure to balance each other in the shield-tunneling construction is according to the unearthed amount of native cabin pressure adjustment in real time, requires the helical feed machine hydraulic system accurately to control the conveyor rotating speed in real time according to the feedback signal of native cabin pressure.Sealed compartment under any circumstance all should be able to be reliably airtight to prevent the accident of gushing, and requires the screw conveyor gate under any circumstance all can reliably close.
Summary of the invention
For problem that overcomes shield-tunneling construction process existence in the background technique and the requirement of satisfying shield-tunneling construction, the object of the present invention is to provide the shield screw conveyer hydraulic system of a kind of Proportional Feedback control and accumulator repairing, can control the rotating speed of screw conveyor in real time, and guarantee the safety of tunnel construction.
The technical solution adopted for the present invention to solve the technical problems comprises: two 3-position 4-way solenoid directional control valves, motor, speed probe, one-way valve, throttle valve, two Pilot operated check valves, the bi-bit bi-pass solenoid directional control valve, oil hydraulic cylinder, displacement transducer, position limit switch, by ball valve, the off-load ball valve, relief valve, accumulator.The oil inlet P of first 3-position 4-way solenoid directional control valve
1Respectively with the oil inlet P of second 3-position 4-way solenoid directional control valve
2, one-way valve filler opening A
5Be communicated with; The oil return inlet T of first 3-position 4-way solenoid directional control valve
1Respectively with the oil return inlet T of second 3-position 4-way solenoid directional control valve
2, the off-load ball valve oil return inlet T
3, relief valve oil return inlet T
4Be communicated with; The oil outlet A of first 3-position 4-way solenoid directional control valve
1Be communicated with the oil outlet B of first 3-position 4-way solenoid directional control valve with the actuator port A of motor
1Be communicated with the actuator port B of motor; Speed probe is installed on the output shaft of motor; The filler opening A of first Pilot operated check valve
3Oil outlet A with second 3-position 4-way solenoid directional control valve
2Be communicated with the oil outlet B of first Pilot operated check valve
3Be communicated with the rodless cavity of oil hydraulic cylinder; The filler opening A of second Pilot operated check valve
4Oil outlet B with second 3-position 4-way solenoid directional control valve
2Be communicated with the oil outlet B of second Pilot operated check valve
4Respectively with the oil outlet B of bi-bit bi-pass solenoid directional control valve
7, oil hydraulic cylinder rod chamber be communicated with; Displacement transducer is built in the oil hydraulic cylinder the inside; Position limit switch is fixedly mounted on the oil hydraulic cylinder two ends; The oil outlet B of one-way valve
5Respectively with the filler opening A of throttle valve
6, by the actuator port A of ball valve
8Be communicated with the oil outlet B of throttle valve
6Filler opening A with the bi-bit bi-pass solenoid directional control valve
7Be communicated with, by the actuator port B of ball valve
8Respectively with the actuator port S of accumulator, the oil inlet P of relief valve
4, the off-load ball valve oil inlet P
3Be communicated with.
The present invention compares with background technique, and the useful effect that has is:
1) adopts native cabin pressure electricity feedback and variable displacement pump Proportional Feedback hydraulic control technology, realized the Adjustable real-time of screw conveyor rotating speed, to the disturbance of the soil body, reduce surface deformable in the time of controlling shield driving preferably;
The mud mouth gate reliably closes the safety of assurance tunnel construction when 2) adopting the accumulator repairing to realize off-position or paroxysmal disorderly closedown state.
The present invention can make shield structure screw conveyer system adapt to the stratum of various complexity, system reliability height.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing is a structural principle schematic representation of the present invention.
Among the figure: 1. 3-position 4-way solenoid directional control valve, 2. motor, 3. speed probe, 4. one-way valve, 5. 3-position 4-way solenoid directional control valve, 6. throttle valve, 7. Pilot operated check valve, 8. bi-bit bi-pass solenoid directional control valve, 9. Pilot operated check valve, 10. oil hydraulic cylinder, 11. displacement sensors, 12. position limit switch, 13. by ball valve, 14. off-load ball valves, 15. relief valve, 16. accumulators.
Embodiment
As shown in drawings, the present invention includes two 3-position 4-way solenoid directional control valves 1,5, motor 2, speed probe 3, one-way valve 4, throttle valve 6, two Pilot operated check valves 7,9, bi-bit bi-pass solenoid directional control valve 8, oil hydraulic cylinder 10, displacement transducer 11, position limit switch 12, by ball valve 13, off-load ball valve 14, relief valve 15, accumulator 16.The oil inlet P of first 3-position 4-way solenoid directional control valve 1
1Respectively with the oil inlet P of second 3-position 4-way solenoid directional control valve 5
2, one-way valve 4 filler opening A
5Be communicated with; The oil return inlet T 1 of first 3-position 4-way solenoid directional control valve 1 respectively with the oil return inlet T of second 3-position 4-way solenoid directional control valve 5
2, off-load ball valve 14 oil return inlet T
3, relief valve 15 oil return inlet T
4Be communicated with; The oil outlet A of first 3-position 4-way solenoid directional control valve 1
1Be communicated with the oil outlet B of first 3-position 4-way solenoid directional control valve 1 with the actuator port A of motor 2
1Be communicated with the actuator port B of motor 2; Speed probe 3 is installed on the output shaft of motor 2; The filler opening A of first Pilot operated check valve 9
3Oil outlet A with second 3-position 4-way solenoid directional control valve 5
2Be communicated with the oil outlet B of first Pilot operated check valve 9
3Be communicated with the rodless cavity of oil hydraulic cylinder 10; The filler opening A of second Pilot operated check valve 7
4Oil outlet B with second 3-position 4-way solenoid directional control valve 5
2Be communicated with the oil outlet B of second Pilot operated check valve 7
4Respectively with the oil outlet B of bi-bit bi-pass solenoid directional control valve 8
7, oil hydraulic cylinder 10 rod chamber be communicated with; Displacement transducer 11 is built in oil hydraulic cylinder 10 the insides; Position limit switch 12 is fixedly mounted on oil hydraulic cylinder 10 two ends; The oil outlet B of one-way valve 4
5Respectively with the filler opening A of throttle valve 6
6, by the actuator port A of ball valve 13
8Be communicated with the oil outlet B of throttle valve 6
6Filler opening A with bi-bit bi-pass solenoid directional control valve 8
7Be communicated with, by the actuator port B of ball valve 13
8Respectively with the actuator port S of accumulator 16, the oil inlet P of relief valve 15
4, off-load ball valve 14 oil inlet P
3Be communicated with.
Working principle of the present invention is as follows:
During the casting of shield screw conveyer, the keying of mud mouth gate is the override level, and should open the mud mouth gate earlier this moment, then starting motor 2.System pressure oil is through entering the oil inlet P of 3-position 4-way solenoid directional control valve 5
2, 3-position 4-way solenoid directional control valve 5 is in the b position, the oil inlet P in the 3-position 4-way solenoid directional control valve 5 at this moment
2With oil outlet A
2Be communicated with oil return inlet T
2With oil outlet B
2Be communicated with, pressure oil is through the oil outlet A of 3-position 4-way solenoid directional control valve 5
2Flow out, enter the filler opening A of Pilot operated check valve 9
3, from the oil outlet B of Pilot operated check valve 9
3Flow out, enter the rodless cavity of oil hydraulic cylinder 10, the piston rod that promotes oil hydraulic cylinder travels forward.The pressure oil of oil hydraulic cylinder rod chamber enters the oil outlet B of Pilot operated check valve 7
4, from the filler opening A of Pilot operated check valve 7
4Flow out, enter the oil outlet B of 3-position 4-way solenoid directional control valve 5
2, then from the oil return inlet T of 3-position 4-way solenoid directional control valve 5
2Flow out, flow back to fuel tank at last.When hydraulic cylinder piston rod was pushed ahead, the mud mouth gate was opened, and its opening amount increases gradually.Displacement transducer 11 is used for detecting in real time the forward displacement of oil hydraulic cylinder 10, and when detected forward displacement equaled predefined displacement, 5 outages of 3-position 4-way solenoid directional control valve were in meta, and the piston rod of oil hydraulic cylinder is fixed on desired location.Position limit switch 12 in the system is used to provide the limit position information of mud mouth gate oil hydraulic cylinder.
When the piston rod of oil hydraulic cylinder 10 was pushed ahead desired location, 3-position 4-way solenoid directional control valve 1 got the electric d position that is in, the oil inlet P in the 3-position 4-way solenoid directional control valve 1
1With oil outlet A
1Be communicated with oil return inlet T
1With oil outlet B
1Be communicated with, system pressure oil enters the oil inlet P of 3-position 4-way solenoid directional control valve 1
1, through the oil outlet A of 3-position 4-way solenoid directional control valve 1
1Flow out, enter the actuator port A of motor 2, motor 2 is just changeing, and pressure oil enters the oil outlet B of 3-position 4-way solenoid directional control valve 1 by motor 2 actuator port B
1, then from the oil return inlet T of 3-position 4-way solenoid directional control valve 1
1Flow out, flow back to fuel tank at last.
During motor 2 counter-rotatings, 3-position 4-way solenoid directional control valve 1 gets the electric c position that is in, the oil inlet P in the 3-position 4-way solenoid directional control valve 1
1With oil outlet B
1Be communicated with oil return inlet T
1With oil outlet A
1Be communicated with, system pressure oil enters the oil inlet P of 3-position 4-way solenoid directional control valve 1
1, through the oil outlet B of 3-position 4-way solenoid directional control valve 1
1Flow out, enter the actuator port B of motor 2, pressure oil enters the oil outlet A of 3-position 4-way solenoid directional control valve 1 by motor 2 actuator port A
1, then from the oil return inlet T of 3-position 4-way solenoid directional control valve 1
1Flow out, flow back to fuel tank at last.
In the shield-tunneling construction process,, reduce surface deformable in order to control disturbance to the soil body, key factor be to keep in the sealed compartment advance the soil amount and the casting amount is complementary.Under the certain condition of cutterhead rotating speed and fltting speed, the casting amount in the sealed compartment and the rotating speed of screw conveyor are directly proportional, thereby should be specifically noted that the rotating speed of adjusting screw conveyor in the construction, so that the sealed compartment pressure surge is controlled at minimum radius.Can adjust the rotating speed of screw conveyor this moment according to the earth pressure of the soil pressure case actual measurement that is positioned at sealed compartment.Prescribe a time limit when earth pressure surpasses going up of target soil pressure setting, the rotating speed of screw conveyor increases, and strengthens the casting amount; Prescribe a time limit when earth pressure is lower than the following of target soil pressure setting, the rotating speed of screw conveyor reduces, and reduces the casting amount; When earth pressure was positioned at the scope of target soil pressure setting, screw conveyor rotated casting with constant speed.The rotating speed of motor 2 is detected in real time by the speed probe 3 that is installed on its output shaft in the system, speed probe 3 detects controlled parameter output quantity, amplify through shaping, comparison and gain adjustment, the passing ratio amplification controller is controlled the proportional control valve of main driven pump, make the corresponding proportional variation of main driven pump discharge capacity, thereby reach the rotating speed of required screw conveyor.Adopt the control strategy of native cabin pressure electricity feedback and variable displacement pump Proportional Feedback hydraulic control motor rotating speed, can control the casting amount of screw conveyor in real time, to the disturbance of the soil body, reduce ground settlement in the time of controlling shield driving preferably.
When the shield structure stops construction or section of jurisdiction installation, should close the mud mouth gate earlier, motor stall then.System pressure oil enters the oil inlet P of 3-position 4-way solenoid directional control valve 5
2, 3-position 4-way solenoid directional control valve 5 is in a position, the oil inlet P in the 3-position 4-way solenoid directional control valve 5 at this moment
2With oil outlet B
2Be communicated with oil return inlet T
2With oil outlet A
2Be communicated with, pressure oil is through the oil outlet B of 3-position 4-way solenoid directional control valve 5
2Flow out, enter the filler opening A of Pilot operated check valve 7
4, from the oil outlet B of Pilot operated check valve 7
4Flow out, enter the rodless cavity of hydraulic jack 10, the piston rod that promotes oil hydraulic cylinder moves backward.The pressure oil of oil hydraulic cylinder rodless cavity enters the oil outlet B of Pilot operated check valve 9
3, from the filler opening A of Pilot operated check valve 9
3Flow out, enter the oil outlet A of 3-position 4-way solenoid directional control valve 5
2, then from the oil return inlet T of 3-position 4-way solenoid directional control valve 5
2Flow out, flow back to fuel tank at last.When the rollback displacement of displacement transducer 11 detected oil hydraulic cylinders 10 was in the limit position on position limit switch 12 left sides, 5 outages of 3-position 4-way solenoid directional control valve were in meta, mud mouth closing gate.This moment 3-position 4-way solenoid directional control valve 1 also outage be in meta, motor 2 stalls.
During the system proper functioning, bi-bit bi-pass solenoid directional control valve 8 the electric closed condition that is in, pressure oil enters the filler opening A of one-way valve 4
5, from the oil outlet B of one-way valve 4
5Flow out, enter actuator port A by ball valve 13
8, from actuator port B by ball valve 13
8Flow out, enter the actuator port S of accumulator 16, accumulator 16 carries out the pressurising accumulation of energy.
At off-position or paroxysmal disorderly closedown state, in order to prevent the accident of gushing, should be able to guarantee reliably closing of screw conveyer mud mouth gate, to guarantee the earth pressure balance in soil pressure cabin.During the system sudden power, accumulator 16 serves as the function of pump, and pressure oil enters actuator port B by ball valve 13 through accumulator 16 actuator port S
8, from actuator port A by ball valve 13
8Flow out, enter the filler opening A of throttle valve 6
6, from the oil outlet B of throttle valve 6
6Flow out, enter the filler opening A of bi-bit bi-pass solenoid directional control valve 8
7, from the oil outlet B of bi-bit bi-pass solenoid directional control valve 8
7Flow out, enter the rod chamber of oil hydraulic cylinder 10, flow is provided for oil hydraulic cylinder 10, the mud extraction port strobe is slowly closed, the hydraulic oil of oil hydraulic cylinder rodless cavity enters the oil outlet B of Pilot operated check valve 9
3, through the filler opening A of Pilot operated check valve 9
3Flow out, enter the oil outlet A of 3-position 4-way solenoid directional control valve 5
2, then from the oil return inlet T of 3-position 4-way solenoid directional control valve 5
2Flow out, flow back to fuel tank at last.The closing velocity of mud mouth gate can be regulated by throttle valve 6.In the shutdown situation of long period, on should in time blinding off a line by ball valve 13, in case, cause the phenomenon of poor sealing owing to leak and cause that clossing pressure is low excessively.
Relief valve 15 and off-load ball valve 14 play the safety protection effect, can prevent accumulator 16 superpressures.When accumulator 16 pressure surpass the pressure of relief valve 15 settings, the oil inlet P of relief valve 15
4With oil outlet T
4Conducting, the pressure oil of accumulator 16 flows out from relief valve 15, flows back to fuel tank.Also can open off-load ball valve 14 this moment, and the pressure oil of accumulator 16 flows out from off-load ball valve 14, flows back to fuel tank at last.
Claims (1)
1, the shield screw conveyer hydraulic system of a kind of Proportional Feedback control and accumulator repairing is characterized in that comprising: two 3-position 4-way solenoid directional control valves (1,5), motor (2), speed probe (3), one-way valve (4), throttle valve (6), two Pilot operated check valves (7,9), bi-bit bi-pass solenoid directional control valve (8), oil hydraulic cylinder (10), displacement transducer (11), position limit switch (12), by ball valve (13), off-load ball valve (14), relief valve (15), accumulator (16); The oil inlet P of first 3-position 4-way solenoid directional control valve (1)
1Respectively with the oil inlet P of second 3-position 4-way solenoid directional control valve (5)
2, one-way valve (4) filler opening A
5Be communicated with; The oil return inlet T of first 3-position 4-way solenoid directional control valve (1)
1Respectively with the oil return inlet T of second 3-position 4-way solenoid directional control valve (5)
2, off-load ball valve (14) oil return inlet T
3, relief valve (15) oil return inlet T
4Be communicated with; The oil outlet A of first 3-position 4-way solenoid directional control valve (1)
1Be communicated with the oil outlet B of first 3-position 4-way solenoid directional control valve (1) with the actuator port A of motor (2)
1Be communicated with the actuator port B of motor (2); Speed probe (3) is installed on the output shaft of motor (2); The filler opening A of first Pilot operated check valve (9)
3Oil outlet A with second 3-position 4-way solenoid directional control valve (5)
2Be communicated with the oil outlet B of first Pilot operated check valve (9)
3And the rodless cavity of oil hydraulic cylinder (10) is communicated with; The filler opening A of second Pilot operated check valve (7)
4Oil outlet B with second 3-position 4-way solenoid directional control valve (5)
2Be communicated with the oil outlet B of second Pilot operated check valve (7)
4Respectively with the oil outlet B of bi-bit bi-pass solenoid directional control valve (8)
7, oil hydraulic cylinder (10) rod chamber be communicated with; Displacement transducer (11) is built in oil hydraulic cylinder (10) the inside; Position limit switch (12) is fixedly mounted on oil hydraulic cylinder (10) two ends; The oil outlet B of one-way valve (4)
5Respectively with the filler opening A of throttle valve (6)
6, by the actuator port A of ball valve (13)
8Be communicated with the oil outlet B of throttle valve (6)
6Filler opening A with bi-bit bi-pass solenoid directional control valve (8)
7Be communicated with, by the actuator port B of ball valve (13)
8Respectively with the actuator port S of accumulator (16), the oil inlet P of relief valve (15)
4, off-load ball valve (14) oil inlet P
3Be communicated with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100254080A CN1300472C (en) | 2004-06-16 | 2004-06-16 | Shielding spiral conveyor hydraulic system with proportional feedback control and accumulator oil supplementary |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100254080A CN1300472C (en) | 2004-06-16 | 2004-06-16 | Shielding spiral conveyor hydraulic system with proportional feedback control and accumulator oil supplementary |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1584346A true CN1584346A (en) | 2005-02-23 |
| CN1300472C CN1300472C (en) | 2007-02-14 |
Family
ID=34601214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100254080A Expired - Fee Related CN1300472C (en) | 2004-06-16 | 2004-06-16 | Shielding spiral conveyor hydraulic system with proportional feedback control and accumulator oil supplementary |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1300472C (en) |
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| CN101225844B (en) * | 2006-12-04 | 2010-12-22 | 丹科斯公司 | System and valve devcie for quickly and exigently closing hydraulic actuated valve |
| CN101498281B (en) * | 2009-02-20 | 2011-01-05 | 哈尔滨工业大学 | Direct drive type hydraulic variable pitch controlling mechanism for wind power generator |
| CN101576107B (en) * | 2009-06-01 | 2011-07-13 | 浙江大学 | Energy recovery device in shield duct piece assembling driving system |
| CN101440833B (en) * | 2008-12-09 | 2012-07-18 | 吕晶 | Modularization digital closed loop power mechanism |
| CN102797728A (en) * | 2011-12-29 | 2012-11-28 | 南京工程学院 | Variable flywheel-based energy-saving hydraulic vibration system and working mode thereof |
| CN102852709A (en) * | 2012-09-06 | 2013-01-02 | 刘志兵 | Hydraulic engine and control method thereof |
| CN103016018A (en) * | 2012-12-26 | 2013-04-03 | 浙江大学 | Closed energy-saving shield screw conveyor hydraulic system |
| CN103419841A (en) * | 2013-08-19 | 2013-12-04 | 中铁隧道装备制造有限公司 | Automatic levelling and steering device of shield trackless trailer in circular tunnel |
| CN103591075A (en) * | 2013-11-29 | 2014-02-19 | 徐州重型机械有限公司 | Hydraulic control system synchronous with crane and balancing weight hydraulic cylinder and flow control valve |
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| CN105888685A (en) * | 2016-06-18 | 2016-08-24 | 无锡市翱宇特新科技发展有限公司 | Displacement control device of shielding screw conveyer |
| CN106246642A (en) * | 2016-09-21 | 2016-12-21 | 长春工业大学 | A kind of oil circuit control to pilot operated valve device implements the locking loop individually controlled |
| CN106246623A (en) * | 2016-08-30 | 2016-12-21 | 徐州五洋科技股份有限公司 | A kind of activating feeder hydraulic gate constant pressure hydraulic control system |
| CN106438591A (en) * | 2016-08-26 | 2017-02-22 | 辽宁三三工业有限公司 | Proportional-control high-precision propelling hydraulic system for earth pressure balance shield tunneling machine and control method |
| CN108644161A (en) * | 2018-05-22 | 2018-10-12 | 中冶宝钢技术服务有限公司 | The hydraulic module of emergent repairing |
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| JP2002369614A (en) * | 2001-06-15 | 2002-12-24 | Yanmar Agricult Equip Co Ltd | Combine harvester |
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| CN101225844B (en) * | 2006-12-04 | 2010-12-22 | 丹科斯公司 | System and valve devcie for quickly and exigently closing hydraulic actuated valve |
| CN101440833B (en) * | 2008-12-09 | 2012-07-18 | 吕晶 | Modularization digital closed loop power mechanism |
| CN101498281B (en) * | 2009-02-20 | 2011-01-05 | 哈尔滨工业大学 | Direct drive type hydraulic variable pitch controlling mechanism for wind power generator |
| CN101576107B (en) * | 2009-06-01 | 2011-07-13 | 浙江大学 | Energy recovery device in shield duct piece assembling driving system |
| CN102797728B (en) * | 2011-12-29 | 2015-02-04 | 南京工程学院 | Variable flywheel-based energy-saving hydraulic vibration system and working mode thereof |
| CN102797728A (en) * | 2011-12-29 | 2012-11-28 | 南京工程学院 | Variable flywheel-based energy-saving hydraulic vibration system and working mode thereof |
| CN102852709A (en) * | 2012-09-06 | 2013-01-02 | 刘志兵 | Hydraulic engine and control method thereof |
| CN103016018A (en) * | 2012-12-26 | 2013-04-03 | 浙江大学 | Closed energy-saving shield screw conveyor hydraulic system |
| CN103419841A (en) * | 2013-08-19 | 2013-12-04 | 中铁隧道装备制造有限公司 | Automatic levelling and steering device of shield trackless trailer in circular tunnel |
| CN103419841B (en) * | 2013-08-19 | 2016-02-03 | 中铁工程装备集团有限公司 | Shield structure trackless trailer automatic leveling steering hardware in circular tunnel |
| CN103591075A (en) * | 2013-11-29 | 2014-02-19 | 徐州重型机械有限公司 | Hydraulic control system synchronous with crane and balancing weight hydraulic cylinder and flow control valve |
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| CN104444893A (en) * | 2014-11-27 | 2015-03-25 | 中联重科股份有限公司 | Winch control system |
| CN105888685A (en) * | 2016-06-18 | 2016-08-24 | 无锡市翱宇特新科技发展有限公司 | Displacement control device of shielding screw conveyer |
| CN106438591A (en) * | 2016-08-26 | 2017-02-22 | 辽宁三三工业有限公司 | Proportional-control high-precision propelling hydraulic system for earth pressure balance shield tunneling machine and control method |
| CN106246623A (en) * | 2016-08-30 | 2016-12-21 | 徐州五洋科技股份有限公司 | A kind of activating feeder hydraulic gate constant pressure hydraulic control system |
| CN106246623B (en) * | 2016-08-30 | 2018-07-27 | 徐州五洋科技股份有限公司 | A kind of activating feeder hydraulic gate constant pressure hydraulic control system |
| CN106246642A (en) * | 2016-09-21 | 2016-12-21 | 长春工业大学 | A kind of oil circuit control to pilot operated valve device implements the locking loop individually controlled |
| CN108644161A (en) * | 2018-05-22 | 2018-10-12 | 中冶宝钢技术服务有限公司 | The hydraulic module of emergent repairing |
| CN110762064A (en) * | 2018-07-27 | 2020-02-07 | 比亚迪股份有限公司 | Hydraulic control system and garbage truck |
| CN110762064B (en) * | 2018-07-27 | 2021-09-03 | 比亚迪股份有限公司 | Hydraulic control system and garbage truck |
| CN109026153A (en) * | 2018-08-03 | 2018-12-18 | 中国电建集团铁路建设有限公司 | A kind of pre- prevention and control device of earth pressure balanced shield, EPBS gas |
| CN108895049A (en) * | 2018-08-28 | 2018-11-27 | 长沙学院 | A kind of Feedback Oil accurate positioning stabilization control device and method of hydraulic cylinder |
| CN110541715A (en) * | 2019-10-15 | 2019-12-06 | 徐州徐工基础工程机械有限公司 | Mud control system and push bench |
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