CN104196777A - Programmable integrated control system capable of controlling inlet and outlet oil ways independently - Google Patents
Programmable integrated control system capable of controlling inlet and outlet oil ways independently Download PDFInfo
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- CN104196777A CN104196777A CN201410448782.5A CN201410448782A CN104196777A CN 104196777 A CN104196777 A CN 104196777A CN 201410448782 A CN201410448782 A CN 201410448782A CN 104196777 A CN104196777 A CN 104196777A
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Abstract
The invention discloses a programmable integrated control system capable of controlling inlet and outlet oil ways independently. The programmable integrated control system comprises an integrated hydraulic valve, a controller, an active input device, a hydraulic actuator, a hydraulic oil source and a hydraulic oil tank. The integrated hydraulic valve comprises five two-position two-way electro-hydraulic proportional valves and is connected with a bridge-type circuit through a hydraulic pipeline. The active input device is connected with the controller through a circuit, and the controller is connected with the integrated hydraulic valve through a circuit; the hydraulic actuator is connected with the integrated hydraulic valve through a pipeline, and the integrated hydraulic valve is connected with the hydraulic oil source and the hydraulic oil tank through pipelines. The programmable integrated control system has high efficiency and response performance and is simple in structure and easy to achieve; the integrated hydraulic valve is simple in design, convenient to machine, good in interchangeability and capable of meeting the requirements of different types of hydraulic actuators and has various variable median functions, and a valve element is easy to design and machine.
Description
Technical field
The present invention relates to a kind of integrated form control system able to programme, relate in particular to a kind of integrated form control system able to programme that hydraulic circuit is independently controlled of importing and exporting.
Background technique
In traditional valve control hydraulic system, the four-way valve that general employing " controlled " is one to one controlled a hydraulic actuator.Because the spool of four-way valve is mechanically fixed together, this has just caused four-way valve after receiving control signal, spool starts mobile under the excitation of control signal, the movement of spool has changed the orifice size of inlet/outlet oil circuit simultaneously, thereby is controlling the flow that enters, flows out hydraulic actuator.Valve control hydraulic system generally comprises Symmetrical Valve control asymmetric cylinder or motor, Asymmetry Valve control asymmetric cylinder or motor, Symmetrical Valve control asymmetrical cylinder and Asymmetry Valve control asymmetrical cylinder etc.The oil-feed of hydraulic actuator and go out the flow-rate ratio that the Area Ratio of oil pocket has determined to enter and flow out hydraulic actuator, due to equating into and out of oil pocket Area Ratio of asymmetric cylinder or motor, thereby its inlet/outlet flow also equates.Yet, in Symmetrical Valve control asymmetrical cylinder hydraulic system, due to the unequal of the oil suction chamber of asymmetrical cylinder and fuel-displaced cavity area ratio and there is nonuniqueness, therefore, caused inlet/outlet flow unequal, its ratio equals the Area Ratio into and out of oil pocket.Owing to controlling at a four-way valve in " controlling one to one " of a hydraulic actuator, the spool of four-way valve is being controlled the flow of inlet/outlet oil circuit simultaneously, and no matter be in the hydraulic system of Symmetrical Valve control asymmetrical cylinder or Asymmetry Valve control asymmetrical cylinder, the movement of spool can only meet the flow that enters or flow out in hydraulic actuator two oil circuits one of them, thereby has caused the inefficient and lower response performance of hydraulic control system.Conventionally in the design and course of working of four-way valve, need to process according to demand the Symmetrical Valve and the Asymmetry Valve that are adapted to dissimilar hydraulic actuator, thereby cause the interchangeability of hydrovalve poor, spool design processing difficulties etc.
Summary of the invention
In order to overcome prior art above shortcomings, the invention provides a kind of inlet/outlet hydraulic circuit and can carry out the independent integrated form control system able to programme of controlling, this invention is simple in structure, control performance good, and has higher efficiency and response performance.
The technical solution adopted for the present invention to solve the technical problems is:
A kind ofly import and export the integrated form control system able to programme that oil circuit is independently controlled, comprise integrated hydraulic valve, controller, active input device, hydraulic actuator, hydraulic oil source and hydraulic oil container, described integrated hydraulic valve comprises five bi-bit bi-pass electro-hydraulic proportional valves, by hydraulic pipe line and " bridge " formula loop, links together; Described active input device is connected with controller by circuit, and controller is connected with integrated hydraulic valve by circuit; Described hydraulic actuator is connected with integrated hydraulic valve by pipeline, and integrated hydraulic valve is connected with hydraulic oil container with hydraulic oil source by pipeline.
Further, at hydraulic actuator oil suction chamber, place is provided with the first pressure transducer, at hydraulic actuator, go out oil pocket place and the second pressure transducer is installed, displacement transducer or speed probe are installed on hydraulic actuator, all the sensors is all connected with controller by circuit.
Described controller sends automatically controlled signal by different control logics to five bi-bit bi-pass electro-hydraulic proportional valves, automatically controlled signal drives the electromagnet action of electro-hydraulic proportional valve and is with movable valve plug action, and then change the on off operating mode of five electro-hydraulic proportion reversing valves, thereby can realize the Telescopic of hydraulic actuator or clockwise and anticlockwise function and O, H, Y, K, M, P, J, C, N-type Median Function.
The invention has the beneficial effects as follows: the present invention has higher efficiency and response performance, simple in structure, implement easily, wherein integrated hydraulic valve simplicity of design, easy to process, interchangeability good, spool design easy processing, can adapt to the demand of dissimilar hydraulic actuator, and there is multiple variable Median Function.
Accompanying drawing explanation
Fig. 1 is that final controlling element is the integrated form control system figure able to programme that the import and export oil circuit of oil hydraulic cylinder is independently controlled;
Fig. 2 is that final controlling element is the integrated form control system figure able to programme that the import and export oil circuit of oil hydraulic motor is independently controlled;
Fig. 3 imports and exports the integrated form control system block diagram able to programme that oil circuit is independently controlled.
In above-mentioned accompanying drawing, 1. displacement transducer, 2. oil hydraulic cylinder, 3. the first pressure transducer, 4. integrated hydraulic valve, 4A. the first bi-bit bi-pass proportional cartridge valve I, 4B. the second bi-bit bi-pass proportional cartridge valve, 4C. the 3rd bi-bit bi-pass proportional cartridge valve, 4D. the 4th bi-bit bi-pass proportional cartridge valve, 4E. the 5th bi-bit bi-pass proportional cartridge valve, 5. hydraulic oil source, 6. hydraulic oil container, 7. controller, 8. initiatively input device, 9. the second pressure transducer, 10. load, 11. speed probes, 12. oil hydraulic motors.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be described in more detail with concrete embodiment.
Import and export the integrated form control system able to programme that oil circuit is independently controlled, as depicted in figs. 1 and 2, it comprises integrated hydraulic valve 4, controller 7, active input device 8, hydraulic actuator 2, hydraulic oil source 5, hydraulic oil container 6; Described hydraulic actuator 2 can be oil hydraulic cylinder, can be also oil hydraulic motor; Shown in Fig. 1, be wherein that hydraulic actuator is the integrated form control system able to programme that the import and export oil circuit of oil hydraulic cylinder is independently controlled; Shown in Fig. 2, be that hydraulic actuator is the integrated form control system figure able to programme that the import and export oil circuit of oil hydraulic motor is independently controlled;
Described integrated hydraulic valve 4 comprises five bi-bit bi-pass electro-hydraulic proportional valve 4A, 4B, 4C, 4D, 4E, by hydraulic pipe line and " bridge " formula loop, link together, its Placement as depicted in figs. 1 and 2, described integrated hydraulic valve 4 comprises the first bi-bit bi-pass electro-hydraulic proportional valve 4A, the second bi-bit bi-pass electro-hydraulic proportional valve 4B, the 3rd bi-bit bi-pass electro-hydraulic proportional valve 4C, the 4th bi-bit bi-pass electro-hydraulic proportional valve 4D and the 5th bi-bit bi-pass electro-hydraulic proportional valve 4E, the first connecting passage of the first connecting passage of the first bi-bit bi-pass electro-hydraulic proportional valve 4A and the 4th bi-bit bi-pass electro-hydraulic proportional valve 4D is connected with described hydraulic actuator jointly, the first connecting passage of the first connecting passage of the second bi-bit bi-pass electro-hydraulic proportional valve 4B and the 5th bi-bit bi-pass electro-hydraulic proportional valve 4E is connected with described hydraulic actuator jointly, the second connecting passage of the second connecting passage of the first connecting passage of the 3rd bi-bit bi-pass electro-hydraulic proportional valve 4C, the 4th bi-bit bi-pass electro-hydraulic proportional valve 4D and the 5th bi-bit bi-pass electro-hydraulic proportional valve 4E is connected with described hydraulic oil source jointly, the second connecting passage of the second connecting passage of the second connecting passage of the first bi-bit bi-pass electro-hydraulic proportional valve 4A, the second bi-bit bi-pass electro-hydraulic proportional valve 4B and the 3rd bi-bit bi-pass electro-hydraulic proportional valve 4C is connected with described hydraulic oil container jointly,
Described active input device 8 is connected with controller 7 by circuit, controller 7 by circuit respectively with integrated hydraulic valve mutually the electromagnetic coil of the first bi-bit bi-pass electro-hydraulic proportional valve 4A in 4, the electromagnetic coil of the electromagnetic coil of the second bi-bit bi-pass electro-hydraulic proportional valve 4B, the 3rd bi-bit bi-pass electro-hydraulic proportional valve 4C, the electromagnetic coil of the 4th bi-bit bi-pass electro-hydraulic proportional valve 4D be connected with the electromagnetic coil of the 5th bi-bit bi-pass electro-hydraulic proportional valve 4E; At hydraulic actuator, 2 oil suction chamber places are provided with the first pressure transducer 3, go out oil pocket place the second pressure transducer 9 is installed at hydraulic actuator 2, when hydraulic actuator 4 is oil hydraulic cylinder, displacement transducer 1 are installed thereon; When hydraulic actuator 4 is oil hydraulic motor, speed probe 12 is installed thereon; All sensors are all connected with controller by circuit.
The workflow of importing and exporting the integrated form control system able to programme that oil circuit independently controls is described below in conjunction with Fig. 3: pumping source provides power for whole hydraulic system, after controller receives the input signal of active input device, to bi-bit bi-pass electro-hydraulic proportional valve output automatically controlled signal, and then control enter, the flow of efflux cylinder pressure or oil hydraulic motor, controller is by the dual feedback of pressure transducer and displacement or speed probe, change in real time the automatically controlled signal of exporting, thereby obtain displacement or the rotating speed of demand.
Table 1 integrated hydraulic valve valve events and middle bit function are realized list
Table 1 is that integrated hydraulic valve valve events and middle bit function are realized list, the working state of importing and exporting the integrated form control system able to programme that oil circuit independently controls is described: when the second bi-bit bi-pass electro-hydraulic proportional valve 4B and the 4th bi-bit bi-pass electro-hydraulic proportional valve 4D (for simplicity, hereinafter to be referred as Proportional valve 4B and Proportional valve 4D, other is roughly the same called for short.) open, when Proportional valve 4A, Proportional valve 4C and Proportional valve 4E close simultaneously, the protruding or oil hydraulic motor forward of the piston rod of oil hydraulic cylinder; simultaneously When Proportional valve 4A and 4E open simultaneously, when Proportional valve 4B, Proportional valve 4C and Proportional valve 4D close simultaneously, the piston rod of oil hydraulic cylinder is to retracting or oil hydraulic motor reversion; When five Proportional valve 4A, Proportional valve 4B, Proportional valve 4C, Proportional valve 4D and Proportional valve 4E Close All, realize O type Median Function; When Proportional valve 4A, Proportional valve 4B, Proportional valve 4D and Proportional valve 4E open simultaneously, when Proportional valve 4C closes, realize H type Median Function; When Proportional valve 4A and Proportional valve 4B open simultaneously, when Proportional valve 4C, Proportional valve 4D and Proportional valve 4E close simultaneously, realize Y type Median Function; When Proportional valve 4A and Proportional valve 4D open simultaneously, when Proportional valve 4B, Proportional valve 4C and Proportional valve 4E close simultaneously, realize K type Median Function; When Proportional valve, 4C opens, and when Proportional valve 4A, Proportional valve 4B, Proportional valve 4D and Proportional valve 4E close simultaneously, realizes M type Median Function; When Proportional valve 4D and Proportional valve 4E open simultaneously, when Proportional valve 4A, Proportional valve 4B and Proportional valve 4C close simultaneously, realize P type Median Function; When Proportional valve, 4B opens, and when Proportional valve 4A, Proportional valve 4C, Proportional valve 4D and Proportional valve 4E close simultaneously, realizes J type Median Function; When Proportional valve, 4C opens, and when Proportional valve 4A, Proportional valve 4B, Proportional valve 4D and Proportional valve 4E close simultaneously, realizes C type Median Function; When Proportional valve, 4A opens, and when Proportional valve 4B, Proportional valve 4C, Proportional valve 4D and Proportional valve 4E close simultaneously, realizes N-type Median Function.
Claims (5)
1. import and export the integrated form control system able to programme that oil circuit is independently controlled for one kind, it is characterized in that: comprise integrated hydraulic valve, controller, active input device, hydraulic actuator, hydraulic oil source and hydraulic oil container, described integrated hydraulic valve comprises five bi-bit bi-pass electro-hydraulic proportional valves, by hydraulic pipe line and " bridge " formula loop, links together; Described active input device is connected with controller by circuit, and controller is connected with integrated hydraulic valve by circuit; Described hydraulic actuator is connected with integrated hydraulic valve by pipeline, and integrated hydraulic valve is connected with hydraulic oil container with hydraulic oil source by pipeline.
2. a kind of integrated form control system able to programme that oil circuit is independently controlled of importing and exporting according to claim 1, it is characterized in that: at hydraulic actuator oil suction chamber, place is provided with the first pressure transducer, at hydraulic actuator, go out oil pocket place the second pressure transducer is installed, displacement transducer or speed probe are installed on hydraulic actuator, and all sensors are all connected with controller by circuit.
3. a kind of integrated form control system able to programme that oil circuit is independently controlled of importing and exporting according to claim 1, it is characterized in that: described integrated hydraulic valve comprises the first bi-bit bi-pass electro-hydraulic proportional valve, the second bi-bit bi-pass electro-hydraulic proportional valve, the 3rd bi-bit bi-pass electro-hydraulic proportional valve, the 4th bi-bit bi-pass electro-hydraulic proportional valve and the 5th bi-bit bi-pass electro-hydraulic proportional valve, the first connecting passage of the first connecting passage of the first bi-bit bi-pass electro-hydraulic proportional valve and the 4th bi-bit bi-pass electro-hydraulic proportional valve is connected with described hydraulic actuator jointly; The first connecting passage of the first connecting passage of the second bi-bit bi-pass electro-hydraulic proportional valve and the 5th bi-bit bi-pass electro-hydraulic proportional valve is connected with described hydraulic actuator jointly; The second connecting passage of the second connecting passage of the first connecting passage of the 3rd bi-bit bi-pass electro-hydraulic proportional valve, the 4th bi-bit bi-pass electro-hydraulic proportional valve and the 5th bi-bit bi-pass electro-hydraulic proportional valve is connected with described hydraulic oil source jointly; The second connecting passage of the second connecting passage of the second connecting passage of the first bi-bit bi-pass electro-hydraulic proportional valve, the second bi-bit bi-pass electro-hydraulic proportional valve and the 3rd bi-bit bi-pass electro-hydraulic proportional valve is connected with described hydraulic oil container jointly.
4. a kind of integrated form control system able to programme that oil circuit is independently controlled of importing and exporting according to claim 1, is characterized in that: described hydraulic actuator can be oil hydraulic cylinder, can be also oil hydraulic motor.
5. a kind of integrated form control system able to programme that oil circuit is independently controlled of importing and exporting according to claim 1, it is characterized in that: at hydraulic actuator oil suction chamber, place is provided with the first pressure transducer, at hydraulic actuator, go out oil pocket place the second pressure transducer is installed, when hydraulic actuator is oil hydraulic cylinder, displacement transducer is installed thereon; When hydraulic actuator is oil hydraulic motor, speed probe is installed thereon; All sensors are all connected with controller by circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410448782.5A CN104196777A (en) | 2014-09-04 | 2014-09-04 | Programmable integrated control system capable of controlling inlet and outlet oil ways independently |
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| CN201410448782.5A CN104196777A (en) | 2014-09-04 | 2014-09-04 | Programmable integrated control system capable of controlling inlet and outlet oil ways independently |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588150A (en) * | 2017-10-19 | 2018-01-16 | 燕山大学 | Especially big load hydraulic bjuffer |
| CN108412829A (en) * | 2018-04-09 | 2018-08-17 | 徐州燕大传动与控制技术有限公司 | A kind of separately adjustable load-sensitive formula multi-way valve of inlet and outlet throttling side energy |
| CN108506259A (en) * | 2018-04-09 | 2018-09-07 | 徐州燕大传动与控制技术有限公司 | A kind of load sensing formula multi-way valve of the inlet and outlet independent control of valve post-compensation |
| CN108661965A (en) * | 2018-05-28 | 2018-10-16 | 徐州燕大传动与控制技术有限公司 | A kind of 3 position-5 way load port independent control multi-way valve with Y type Median Functions |
| CN108716491A (en) * | 2018-05-28 | 2018-10-30 | 徐州燕大传动与控制技术有限公司 | A kind of 3 position-5 way load port independent control multi-way valve with O-shaped Median Function |
| CN109139578A (en) * | 2018-08-14 | 2019-01-04 | 大连海事大学 | A kind of bridge-type Pneumatic power-saving circuit |
| CN110945264A (en) * | 2017-05-22 | 2020-03-31 | 肯德隆（菲林根）有限公司 | Adjustable vibration damper |
| CN111156211A (en) * | 2019-12-24 | 2020-05-15 | 江苏理工学院 | Large-scale hydraulic press movable cross beam plunger type leveling hydraulic system |
| CN111373159A (en) * | 2018-01-11 | 2020-07-03 | 日立建机株式会社 | Construction machine |
| CN111734877A (en) * | 2020-07-09 | 2020-10-02 | 四川航天烽火伺服控制技术有限公司 | Ball valve actuator |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1259427A (en) * | 1998-10-16 | 2000-07-12 | 哈斯凯注塑系统有限公司 | Intelligent type hydraulic valve oil distributor used for injection molding machine, and method therefor |
| US20030106313A1 (en) * | 2001-12-10 | 2003-06-12 | Caterpillar Inc. | Electro-hydraulic valve control system and method |
| CN101184897A (en) * | 2005-05-31 | 2008-05-21 | 卡特彼勒公司 | Hydraulic system having imv ride control configuration |
| US20100107623A1 (en) * | 2007-05-31 | 2010-05-06 | Caterpillar Inc. | Hydraulic system having an external pressure compensator |
| CN103328829A (en) * | 2010-12-17 | 2013-09-25 | 卡特彼勒公司 | Independent metering valve with flow limiter |
| CN203348203U (en) * | 2013-07-02 | 2013-12-18 | 山东泰丰液压股份有限公司 | Speed-regulating hydraulic control valve group of large-flow two-way cartridge valve |
-
2014
- 2014-09-04 CN CN201410448782.5A patent/CN104196777A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1259427A (en) * | 1998-10-16 | 2000-07-12 | 哈斯凯注塑系统有限公司 | Intelligent type hydraulic valve oil distributor used for injection molding machine, and method therefor |
| US20030106313A1 (en) * | 2001-12-10 | 2003-06-12 | Caterpillar Inc. | Electro-hydraulic valve control system and method |
| CN101184897A (en) * | 2005-05-31 | 2008-05-21 | 卡特彼勒公司 | Hydraulic system having imv ride control configuration |
| US20100107623A1 (en) * | 2007-05-31 | 2010-05-06 | Caterpillar Inc. | Hydraulic system having an external pressure compensator |
| CN103328829A (en) * | 2010-12-17 | 2013-09-25 | 卡特彼勒公司 | Independent metering valve with flow limiter |
| CN203348203U (en) * | 2013-07-02 | 2013-12-18 | 山东泰丰液压股份有限公司 | Speed-regulating hydraulic control valve group of large-flow two-way cartridge valve |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110945264B (en) * | 2017-05-22 | 2021-09-03 | 肯德隆（菲林根）有限公司 | Adjustable vibration damper |
| CN110945264A (en) * | 2017-05-22 | 2020-03-31 | 肯德隆（菲林根）有限公司 | Adjustable vibration damper |
| CN107588150A (en) * | 2017-10-19 | 2018-01-16 | 燕山大学 | Especially big load hydraulic bjuffer |
| CN111373159B (en) * | 2018-01-11 | 2022-08-16 | 日立建机株式会社 | Construction machine |
| CN111373159A (en) * | 2018-01-11 | 2020-07-03 | 日立建机株式会社 | Construction machine |
| CN108412829A (en) * | 2018-04-09 | 2018-08-17 | 徐州燕大传动与控制技术有限公司 | A kind of separately adjustable load-sensitive formula multi-way valve of inlet and outlet throttling side energy |
| CN108506259A (en) * | 2018-04-09 | 2018-09-07 | 徐州燕大传动与控制技术有限公司 | A kind of load sensing formula multi-way valve of the inlet and outlet independent control of valve post-compensation |
| CN108506259B (en) * | 2018-04-09 | 2022-02-11 | 徐州燕大传动与控制技术有限公司 | Load sensing type multi-way valve with independently controlled inlet and outlet for valve post compensation |
| CN108412829B (en) * | 2018-04-09 | 2022-02-11 | 徐州燕大传动与控制技术有限公司 | Load sensitive type multi-way valve with independently adjustable inlet and outlet throttling edges |
| CN108661965A (en) * | 2018-05-28 | 2018-10-16 | 徐州燕大传动与控制技术有限公司 | A kind of 3 position-5 way load port independent control multi-way valve with Y type Median Functions |
| CN108716491A (en) * | 2018-05-28 | 2018-10-30 | 徐州燕大传动与控制技术有限公司 | A kind of 3 position-5 way load port independent control multi-way valve with O-shaped Median Function |
| CN109139578A (en) * | 2018-08-14 | 2019-01-04 | 大连海事大学 | A kind of bridge-type Pneumatic power-saving circuit |
| CN111156211B (en) * | 2019-12-24 | 2021-12-21 | 江苏理工学院 | Large-scale hydraulic press movable cross beam plunger type leveling hydraulic system |
| CN111156211A (en) * | 2019-12-24 | 2020-05-15 | 江苏理工学院 | Large-scale hydraulic press movable cross beam plunger type leveling hydraulic system |
| CN111734877A (en) * | 2020-07-09 | 2020-10-02 | 四川航天烽火伺服控制技术有限公司 | Ball valve actuator |
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Application publication date: 20141210 |