CN105221508A - A kind of actuating motor direct-driving type servovalve - Google Patents
A kind of actuating motor direct-driving type servovalve Download PDFInfo
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- CN105221508A CN105221508A CN201510718416.1A CN201510718416A CN105221508A CN 105221508 A CN105221508 A CN 105221508A CN 201510718416 A CN201510718416 A CN 201510718416A CN 105221508 A CN105221508 A CN 105221508A
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Abstract
The invention provides a kind of progression less, the stability of a system is high, good reliability, and resistance tocrocking is strong, and maintenance cost is low, and application is wider, manufacture difficulty and the lower actuating motor direct-driving type servovalve of cost.It comprises main valve plug, valve body, spring, valve body end cap, feed screw nut, ball screw and actuating motor; Main valve plug is slidably mounted in valve body; Four hydraulic fluid ports are provided with in valve body; Main valve plug regulates the on-state between four hydraulic fluid ports by the change of three positions, left, center, right; The left end of main valve plug is offseted by spring and valve body end cap; The right-hand member of main valve plug is connected with feed screw nut, and feed screw nut is installed on ball screw, and actuating motor comprises servo motor shaft, servo motor rotor, servo motor stator and rotating coder; The left end of servo motor shaft is connected with ball screw; Servo motor rotor is connected with servo motor shaft, and servo motor stator is enclosed within outside servo motor rotor, and rotating coder is installed on the right-hand member of servo motor shaft.
Description
Technical field
The present invention relates to a kind of servovalve, specifically refer to a kind of actuating motor direct-driving type servovalve.
Background technique
Servovalve makes again hydraulic control servovalve mainly refer to electrohydraulic control, and it is after accepting electric simulation signal, corresponding flow and the pressure exporting modulation.It is electro-hydraulic converting element, is also power amplification element, and low power faint electrical input signal can be converted to powerful hydraulic energy (flow and pressure) and export by it.In electrohydraulic servo system, electric part and hydraulic part couple together by it, and the conversion and the hydraulic pressure that realize electric liquid signal amplify.Electrohydraulic control is the core that electrohydraulic servo system controls.
Electrohydraulic control is generally divided into moving coil and magneto two kinds by torque motor pattern.Traditional servovalve major part adopts magneto torque motor, and this type of servovalve also can be divided into nozzle baffle type and the large class of jet-type two.Producer's major part of current domestic production servovalve is based on nozzle baffle type.For the working principle of existing force feedback type servovalve, further combined with accompanying drawing 1, servovalve of the prior art comprises, 1-permanent magnet; 2-armature; 3-turns round axle; 4-nozzle; 5-spring sheet; 6-filter; 7-guiding valve; 8-coil; The critical pieces such as 9-yoke.During the input of servovalve spacing current, armature and baffle plate mediate.At this moment the pressure p a=pb in nozzle 4 two chamber, guiding valve 7 two end pressure is equal, and guiding valve is in zero-bit.After input current, electromagnetic torque makes armature 2 together with baffle plate deflection θ angle.If θ is deflection clockwise, then because the skew of baffle plate makes pa > pb, guiding valve moves right.The movement of guiding valve, drive again baffle plate and armature opposite spin (counterclockwise) by feedback spring sheet, two nozzle pressure differences reduce again.Near the original equilibrium position (position during no signal) of armature, the electromagnetic torque of torque motor, guiding valve two side pressure difference act on by spring sheet the moment three that the moment of armature and nozzle pressure act on baffle plate and average out, and armature just no longer moves.Act on oil pressure on guiding valve and feedback spring deformation force balances mutually, guiding valve is located on the position leaving zero-bit one segment distance simultaneously.The mode that this dependence equalising torque decides spool position is called force feedback type.If ignore the power of nozzle act on baffle plate, then the equalising torque that produces of motor electromagnetic torque and guiding valve two end unbalanced pressure, spring sheet is also just subject to the effect of electromagnetic torque.Therefore its distortion, the Distance geometry electromagnetic torque that namely guiding valve leaves zero-bit is directly proportional.Simultaneously because the electromagnetic torque of torque motor and input current are directly proportional, so the displacement of guiding valve is directly proportional to the electric current of input, namely be directly proportional to input current by the flow of guiding valve, and the polarity of electric current determines the direction of liquid stream, so just meets the functional requirement to electrohydraulic control.
At present, the producer of the servovalve of domestic production said structure mainly contains: research institute of Aviation Industry Corporation the 609, research institute of Aviation Industry Corporation the 618, Beijing Machine Tool Inst., research institute of China Academy of Launch Vehicle Technology the 18, Shanghai Aerospace Control Engineering Inst., Jiujiang Zhongchuan Instrument Co., Ltd. (4 41 factory) and No.704 Inst. China Ship Heavy Ind Co..The producer of external production servovalve mainly contains: Moog company of the U.S., Dowty company of Britain, Team company of the U.S., Muscovite " motherland " design bureau, Butterworth Huo get factory etc., and also there are the servovalve product of oneself in U.S. Park company, EatonVickers company, German Bosch company, Rexroth company etc. in addition.The inventor of present patent application finds, the servovalve of said structure, when reality uses, exists following deficiency:
1, prior art none be not adopt electricity to drive deflection motor (actual for electromagnet), the driving force of deflection motor is less, mostly adopts secondary structure, and pilot stage adopts dual-nozzle configuration, and main valve generation adopts slide-valve structure.When causing practical application like this, the linearity is undesirable, and zero-bit is easily drifted about.Special comparatively large by ambient temperature, influence of vibration, have impact on reliability.
2, the twin nipple in existing structure and flow-stopping plate difficulty in reality is processed is comparatively large, and cost is very high.Have impact on the use of servovalve on general industry equipment.
3, the gap of nozzle and flow-stopping plate is very little, requires very high in actual use, generally all need to reach NAS7 level turbidity test to the turbidity test of fluid.Be subject to pollution and can cause nozzle or throttle orifice local if fluid is unclean or all block, cause causing frequency response to decline, differentiate rate of falling low, serious causes system unstable, servovalve inefficacy.
For above-mentioned deficiency, present servovalve institute problem in urgent need to solve is as follows:
1, increase the driving force of electromagnetic coil, make energy Direct driver main valve plug under most of application, reduce the progression of servovalve, improve the stability of a system and reliability.
2, improve servovalve fluid resistance tocrocking, so in use greatly can reduce maintenance cost, expand the application of servovalve.
3, be reduced in the manufacture difficulty in manufacturing process, significantly reduce manufacture cost, improve the application of servovalve on general industrial products further.
In sum, be badly in need of at present wanting a kind of progression less, the stability of a system is high, good reliability, and resistance tocrocking is strong, and maintenance cost is low, and application is wider, manufacture difficulty and the lower servovalve of cost.
Summary of the invention
The technical problem to be solved in the present invention is, provide a kind of progression less, the stability of a system is high, good reliability, and resistance tocrocking is strong, and maintenance cost is low, and application is wider, manufacture difficulty and the lower actuating motor direct-driving type servovalve of cost.
For solving the problems of the technologies described above, technological scheme provided by the invention is: a kind of actuating motor direct-driving type servovalve, and it comprises main valve plug, valve body, spring, valve body end cap, feed screw nut, ball screw and actuating motor; Described main valve plug is slidably mounted in valve body; Four hydraulic fluid ports are provided with in described valve body; Described main valve plug regulates the on-state between four hydraulic fluid ports by the change of three positions, left, center, right; The left end of described main valve plug is offseted by spring and valve body end cap; The right-hand member of main valve plug is connected with feed screw nut, and described feed screw nut is installed on ball screw, and described actuating motor comprises servo motor shaft, servo motor rotor, servo motor stator and rotating coder; The left end of described servo motor shaft is connected with ball screw; Described servo motor rotor is connected with servo motor shaft, and servo motor stator is enclosed within outside servo motor rotor, and rotating coder is installed on the right-hand member of servo motor shaft.
As preferably, described servo motor model number is: the DSD2-028SO44U-45-31 type that German Baumueller Nuernberg GmbH produces, and nominal torque is 0.6Nm, and rated power is the motor of 280W.
As preferably, the model of described rotating coder is: the EQN1325 type multi-turn absolute value encoder of Heidenhain company, precision is: 2500PPR.
After adopting said structure, tool of the present invention has the following advantages: the employing Miniature servo-motors Direct driver main valve plug of the invention carries out axial Bit andits control, and present actuating motor technology is very ripe, and cost has also dropped to receptible degree.The main valve plug of servovalve is directly connected with the axle of actuating motor by ball screw, drives main valve plug to move axially when actuating motor rotates by ball screw.And the rotating coder carried by actuating motor can the axial internal clearance of accurate control bound core to reach the object accurately controlled.And closed loop control can be formed by the pressure transducer being arranged on oil outlet, and accurately to control the delivery pressure of servovalve, the real duplex feedback control effects implementing pressure versus flow.Through facts have proved that the present invention possesses some beneficial effect following.
1, scheme is simple, and technology maturation, improves the reliability of whole servo-system.
2, compared with traditional servovalve, eliminate the higher flow-stopping plate of difficulty of processing and spray nozzle device, the difficulty of processing of whole servovalve is reduced greatly, while raising reliability, reduce processing cost, the application of servovalve is expanded further.
3, because of actuating motor reliable operation, without the nozzle arrangements of the precision of traditional servo valves, the anti-contamination level of oil liquid like this for whole system improves greatly, uses actual user cost greatly to reduce, expands the application of servovalve too.
4, because the position of main valve plug is completely by Serve Motor Control, like this when ambient temperature, humidity etc. change, servovalve is not affected completely, improve the reliability of practical application.
In sum, the invention provides a kind of progression less, the stability of a system is high, good reliability, and resistance tocrocking is strong, and maintenance cost is low, and application is wider, manufacture difficulty and the lower servovalve of cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of modal servovalve in prior art.
Fig. 2 is the structural representation of actuating motor direct-driving type servovalve of the present invention when being in meta.
Fig. 3 is the structural representation of actuating motor direct-driving type servovalve of the present invention when being in the left position of action
As shown in the figure: 1, permanent magnet, 2, armature, 3, turn round axle, 4, nozzle, 5, spring sheet, 6, filter, 7, guiding valve, 8, coil, 9, yoke; 11, main valve plug, 12, valve body, 13, spring, 14, valve body end cap, 15, feed screw nut, 16, ball screw, 17, servo motor shaft, 18, servo motor rotor, 19, servo motor stator, 110, rotating coder.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
By reference to the accompanying drawings 2 and accompanying drawing 3, a kind of actuating motor direct-driving type servovalve, it comprises main valve plug 11, valve body 12, spring 13, valve body end cap 14, feed screw nut 15, ball screw 16 and actuating motor; Described main valve plug 11 is slidably mounted in valve body 12; Four hydraulic fluid ports are provided with in described valve body 12; Described main valve plug 11 regulates the on-state between four hydraulic fluid ports by the change of three positions, left, center, right; The left end of described main valve plug 11 is offseted by spring 13 and valve body end cap 14; The right-hand member of main valve plug 11 is connected with feed screw nut 15, and described feed screw nut 15 is installed on ball screw 16, and described actuating motor comprises servo motor shaft 17, servo motor rotor 18, servo motor stator 19 and rotating coder 110; The left end of described servo motor shaft 17 is connected with ball screw 16; Described servo motor rotor 18 is connected with servo motor shaft 17, and servo motor stator 19 is enclosed within outside servo motor rotor 18, and rotating coder 110 is installed on the right-hand member of servo motor shaft 17.
As preferably, described servo motor model number is: the DSD2-028SO44U-45-31 type that German Baumueller Nuernberg GmbH produces, and nominal torque is 0.6Nm, and rated power is the motor of 280W.
As preferably, the model of described rotating coder 110 is: the EQN1325 type multi-turn absolute value encoder of Heidenhain company, precision is: 2500PPR.
After adopting said structure, tool of the present invention has the following advantages: the employing Miniature servo-motors Direct driver main valve plug of the invention carries out axial Bit andits control, and present actuating motor technology is very ripe, and cost has also dropped to receptible degree.The main valve plug of servovalve is directly connected with the axle of actuating motor by ball screw, drives main valve plug to move axially when actuating motor rotates by ball screw.And the rotating coder carried by actuating motor can the axial internal clearance of accurate control bound core to reach the object accurately controlled.And closed loop control can be formed by the pressure transducer being arranged on oil outlet, and accurately to control the delivery pressure of servovalve, the real duplex feedback control effects implementing pressure versus flow.Through facts have proved that the present invention possesses some beneficial effect following.
1, scheme is simple, and technology maturation, improves the reliability of whole servo-system.
2, compared with traditional servovalve, eliminate the higher flow-stopping plate of difficulty of processing and spray nozzle device, the difficulty of processing of whole servovalve is reduced greatly, while raising reliability, reduce processing cost, the application of servovalve is expanded further.
3, because of actuating motor reliable operation, without the nozzle arrangements of the precision of traditional servo valves, the anti-contamination level of oil liquid like this for whole system improves greatly, uses actual user cost greatly to reduce, expands the application of servovalve too.
4, because the position of main valve plug is completely by Serve Motor Control, like this when ambient temperature, humidity etc. change, servovalve is not affected completely, improve the reliability of practical application.
In sum, the invention provides a kind of progression less, the stability of a system is high, good reliability, and resistance tocrocking is strong, and maintenance cost is low, and application is wider, manufacture difficulty and the lower servovalve of cost.
The operating principle of the servovalve that the present invention relates to is as follows:
By reference to the accompanying drawings 2, when servovalve is in meta, main valve plug 11 mediates, and now A, B hydraulic fluid port is cut off by main valve plug, and A, B mouth is in obstructed state.During servovalve work:
L, to move to left: as shown in Figure 3, now actuating motor coil 9 obtains current excitation actuating motor is rotated, thus drive screw mandrel 16 by feed screw nut 15, main valve plug to be moved to the left, now because main valve plug is moved to the left, P mouth and A mouth is caused to be connected, T mouth and B mouth are connected simultaneously, drive external oil cylinder or other hydraulic actuators.Now the openings of sizes of P mouth and A mouth is proportional to the displacement distance of spool 11, is also proportional to the number of turns that servo motor shaft 17 rotates simultaneously.Also be proportional to the signal of actuating motor input simultaneously.
2, move to right: when actuating motor reverses, contrary with the spool movement direction of accompanying drawing 3, now P mouth and B mouth are connected, and A mouth and T mouth are connected, and realize the counteragent of executive component.
3, the rotating coder 110 that the position that actuating motor rotates carries by motor carries out feedback control, thus realizes the object of accurately control.
4 and under the spring 13 of main valve plug left end is in pressured state for a long time, makes feed screw nut 15 be close to ball screw 16 all the time, eliminate the drive gap between ball screw and feed screw nut, improve control accuracy.
Be described the present invention and mode of execution thereof above, this description does not have restricted, and shown in accompanying drawing is also one of embodiments of the present invention, and actual structure is not limited thereto.If generally speaking those of ordinary skill in the art enlightens by it, when not departing from the invention aim, designing the mode of structure similar to this technological scheme and embodiment without creationary, all should protection scope of the present invention be belonged to.
Claims (3)
1. an actuating motor direct-driving type servovalve, is characterized in that: it comprises main valve plug (11), valve body (12), spring (13), valve body end cap (14), feed screw nut (15), ball screw (16) and actuating motor; Described main valve plug (11) is slidably mounted in valve body (12); Four hydraulic fluid ports are provided with in described valve body (12); Described main valve plug (11) regulates the on-state between four hydraulic fluid ports by the change of three positions, left, center, right; The left end of described main valve plug (11) is offseted by spring (13) and valve body end cap (14); The right-hand member of main valve plug (11) is connected with feed screw nut (15), described feed screw nut (15) is installed on ball screw (16), and described actuating motor comprises servo motor shaft (17), servo motor rotor (18), servo motor stator (19) and rotating coder (110); The left end of described servo motor shaft (17) is connected with ball screw (16); Described servo motor rotor (18) is connected with servo motor shaft (17), servo motor stator (19) is enclosed within servo motor rotor (18) outward, and rotating coder (110) is installed on the right-hand member of servo motor shaft (17).
2. actuating motor direct-driving type servovalve according to claim 1, is characterized in that: described servo motor model number is: the DSD2-028SO44U-45-31 type that German Baumueller Nuernberg GmbH produces, and nominal torque is 0.6Nm, and rated power is the motor of 280W.
3. actuating motor direct-driving type servovalve according to claim 1, is characterized in that: the model of described rotating coder (110) is: the EQN1325 type multi-turn absolute value encoder of Heidenhain company, precision is: 2500PPR.
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| CN201510718416.1A CN105221508A (en) | 2015-10-29 | 2015-10-29 | A kind of actuating motor direct-driving type servovalve |
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| CN201510718416.1A CN105221508A (en) | 2015-10-29 | 2015-10-29 | A kind of actuating motor direct-driving type servovalve |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105697704A (en) * | 2016-03-04 | 2016-06-22 | 苏州道森钻采设备股份有限公司 | Screw rod transmission mechanism changeable in rotation speed and torque |
| CN108246809A (en) * | 2018-01-31 | 2018-07-06 | 湖北环电磁装备工程技术有限公司 | The forging roll that a kind of no frame permanent magnet synchronous motor directly drives |
| CN108311623A (en) * | 2018-01-31 | 2018-07-24 | 湖北环电磁装备工程技术有限公司 | A kind of forging roll that rimless combination type permanent-magnet linear synchronous motor directly drives |
| CN108757622A (en) * | 2018-08-14 | 2018-11-06 | 三河沃达液压控制系统有限公司 | Direct Action Type digital servo valve |
| CN109114255A (en) * | 2018-09-28 | 2019-01-01 | 江苏扬州富达液压机械集团有限公司 | A kind of servo synchronization hydraulic valve and its application |
| CN110582662A (en) * | 2017-04-28 | 2019-12-17 | 株式会社富士金 | fluid control valve and fluid control device using the same |
| CN112196854A (en) * | 2020-09-19 | 2021-01-08 | 安徽工程大学 | Two-stage electro-hydraulic servo valve |
| CN113162313A (en) * | 2021-04-15 | 2021-07-23 | 浙大城市学院 | Two-dimensional motor and servo valve |
| CN113983011A (en) * | 2021-12-31 | 2022-01-28 | 青州海盾液压机械有限公司 | Intelligent digital hydraulic system |
| CN116255493A (en) * | 2023-05-15 | 2023-06-13 | 苏州海卓伺服驱动技术有限公司 | Servo valve adjusting and controlling method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105697704A (en) * | 2016-03-04 | 2016-06-22 | 苏州道森钻采设备股份有限公司 | Screw rod transmission mechanism changeable in rotation speed and torque |
| CN110582662A (en) * | 2017-04-28 | 2019-12-17 | 株式会社富士金 | fluid control valve and fluid control device using the same |
| CN108246809A (en) * | 2018-01-31 | 2018-07-06 | 湖北环电磁装备工程技术有限公司 | The forging roll that a kind of no frame permanent magnet synchronous motor directly drives |
| CN108311623A (en) * | 2018-01-31 | 2018-07-24 | 湖北环电磁装备工程技术有限公司 | A kind of forging roll that rimless combination type permanent-magnet linear synchronous motor directly drives |
| CN108757622A (en) * | 2018-08-14 | 2018-11-06 | 三河沃达液压控制系统有限公司 | Direct Action Type digital servo valve |
| CN109114255A (en) * | 2018-09-28 | 2019-01-01 | 江苏扬州富达液压机械集团有限公司 | A kind of servo synchronization hydraulic valve and its application |
| CN112196854A (en) * | 2020-09-19 | 2021-01-08 | 安徽工程大学 | Two-stage electro-hydraulic servo valve |
| CN113162313A (en) * | 2021-04-15 | 2021-07-23 | 浙大城市学院 | Two-dimensional motor and servo valve |
| CN113983011A (en) * | 2021-12-31 | 2022-01-28 | 青州海盾液压机械有限公司 | Intelligent digital hydraulic system |
| CN113983011B (en) * | 2021-12-31 | 2022-02-25 | 青州海盾液压机械有限公司 | Intelligent digital hydraulic system |
| CN116255493A (en) * | 2023-05-15 | 2023-06-13 | 苏州海卓伺服驱动技术有限公司 | Servo valve adjusting and controlling method and system |
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Application publication date: 20160106 |