CN101737371B - Zero maintaining mechanism of 2D digital servo valve - Google Patents
Zero maintaining mechanism of 2D digital servo valve Download PDFInfo
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- CN101737371B CN101737371B CN2010101088261A CN201010108826A CN101737371B CN 101737371 B CN101737371 B CN 101737371B CN 2010101088261 A CN2010101088261 A CN 2010101088261A CN 201010108826 A CN201010108826 A CN 201010108826A CN 101737371 B CN101737371 B CN 101737371B
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Abstract
The invention relates to a zero maintaining mechanism of a2D digital servo valve, which comprises an upper balance wheel connected with a motor shaft, a lower balance wheel connected with a valve plug, a swing shaft and a zero maintaining spring, wherein the middle of the upper balance wheel is provided with a mounting hole for the motor shaft to pass through, the upper end of the upper balance wheel is provided with a through groove in a cutting way, two half parts of the upper end of the upper balance wheel are fixedly connected, the lower end of the upper balance wheel is provided with a notch which is internally provided with the swing shaft, one end of the swing shaft extends into a limit hole of a motor mounting plate, the upper part of the lower balance wheel can be rotatably sleeved on the swing shaft, the lower part of the lower balance wheel is provided with a mounting hole for the valve plug to pass through, the lower end of the lower balance is provided with a through groove in a cutting way, two half parts of the lower end of the lower balance wheel are fixedly connected, the upper end of the zero maintaining spring is fixedly connected with the lower part of the lower balance wheel, and the lower end of the zero maintaining spring is fixedly connected with the motor mounting plate. The invention can effectively ensure zero stability when a digital electro-hydraulic servo system is initialized, and prevent false operation of an executing mechanism, caused by zero offset, from causing potential safety hazards of the masses and equipment.
Description
Technical field
The present invention relates to 2D digital servo valve field, especially a kind of Zero maintaining mechanism of 2D digital servo valve.
Background technique
In recent years, the 2D digital servo valve that utilizes the servo screw mechanism principle work because of its have dynamically good, precision is high, simple in structure, cheap and characteristics that contamination resistance is strong are applied to metallic material testing machine, earthquake simulation test platform and relevant important events such as Aero-Space electrohydraulic servo system by success.The 2D digital servo valve utilizes the translation interface of multipole AC servo motor as its electromechanical.Generally speaking, be to power on (this moment, control signal was zero) to digital servo valve earlier in the initialization procedure of electrohydraulic servo system, then restart oil hydraulic pump and feed hydraulic oil.Work as opening power, when the control signal of motor was zero, servovalve should be in closed condition, and promptly spool should be in strict mechanical zero; Yet the working principle owing to servo screw mechanism is in vacant state freely in fact between spool and the valve pocket, considers extraneous random disturbances factor, is difficult to guarantee the mechanical zero that is in of spool strictness this moment; If this moment, spool departed from zero-bit slightly, after oil hydraulic pump was opened feeding fluid, based on the working principle of servo screw mechanism, spool can be got back to zero-bit automatically; Yet in this process, fluid might be able to get into a chamber of actuator's (oil hydraulic cylinder), causes the unexpected misoperation of equipment, causes the potential safety hazard of the person and equipment.Therefore, how when initialization, keeping its zero-bit stable, avoid the misoperation of actuator, is very crucial problem during the 2D digital servo valve manufactures and designs.
Summary of the invention
Be difficult to guarantee that zero-bit is stable, cause actuator's misoperation and the deficiency of the potential safety hazard of the person that causes and equipment easily when overcoming the initialization of existing 2D digital servo valve, the present invention can guarantee effectively when a kind of initialization is provided that zero-bit stablizes, avoids zero drift to cause actuator's misoperation and the Zero maintaining mechanism of the 2D digital servo valve of the potential safety hazard of the person that causes and equipment.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of Zero maintaining mechanism of 2D digital servo valve; Comprise that the last escapement that is connected with motor shaft, the following escapement that is connected with spool, swing axis and zero-bit keep spring, the said escapement middle part of going up has the mounting hole that the power supply arbor passes, and said last end-grain cutting of going up escapement has groove; The said upper end two halves that goes up escapement is fixedly connected; Said lower end of going up escapement has notch, and swing axis is installed in the said notch, and said swing axis one end stretches in the spacing hole of motor mounting plate; The said top of escapement down is sleeved on the said swing axis rotationally; The said bottom of escapement down has the mounting hole that supplies spool to pass, and the said following end-grain cutting of escapement down has groove, and the said lower end two halves of escapement down is fixedly connected; Said zero-bit keeps the upper end of spring to be fixedly connected with the said bottom of escapement down, and said zero-bit keeps the lower end of spring to be fixedly connected with said motor mounting plate.
Further, the said bottom of escapement down is provided with groove, and said zero-bit keeps the upper end of spring to be fixedly mounted in the said groove.
Further again, two grooves about the bottom of said following escapement is provided with, said zero-bit keeps the upper end of spring that two assembly departments are arranged, and said assembly department is fixed in the said groove.
Said zero-bit keeps the lower end of spring to be installed on the cushion block, and said cushion block is fixedly mounted on the said motor mounting plate.
The said upper end left-half that goes up escapement has unthreaded hole, and the said upper end right half part of going up escapement has tapped hole, and screw passes said unthreaded hole and is installed in the said tapped hole.
The said lower end left-half of escapement down has unthreaded hole, and the said lower end right half part of escapement down has tapped hole, and screw passes said unthreaded hole and is installed in the said tapped hole.
Technical conceive of the present invention is: the 2D digital servo valve must make its coincidence to the electrical null position of multipole AC servo motor and the mechanical zero adjustment of spool before coming into operation.The electrical null position adjustment of motor is accomplished in the moment of opening power by controller automatically.And the mechanical zero of spool need be on the servovalve test stand by the manual work adjustment, its process is: open controller power source, controller control motor arrives electrical null position automatically, and powers on and to motor certain location torque is provided; Unclamp the zeroing screw, the slight rotational valve core of hand adjustment, under the situation about all blocking in A and B two chambeies, the spool corner position that A chamber and B cavity pressure equate promptly is the mechanical zero of spool, tightens the zeroing screw then, zeroing is accomplished.
The 2D digital servo valve can come into operation after through the zero-bit adjustment, constitutes the digital electro-hydraulic servo-system.In the initialization procedure of system, generally be to power on for the controller of digital servo valve earlier (this moment, the control signal of motor was zero), drive oil hydraulic pump then and feed hydraulic oil.When the initialization opening power, when the control signal of motor was zero, servovalve should be in closed condition under the perfect condition, and promptly spool should be in strict mechanical zero; Yet owing to the working principle of servo screw mechanism, essence is to be in vacant state freely between spool and the valve pocket, considers extraneous random disturbances factor, is difficult to guarantee the mechanical zero that is in of spool strictness this moment; If this moment, spool departed from zero-bit slightly, after oil hydraulic pump was opened feeding fluid, based on the working principle of servo screw mechanism, spool can be got back to zero-bit automatically; Yet in this process, fluid might be able to get into a chamber (A chamber or B chamber) of actuator's (oil hydraulic cylinder), causes the unexpected misoperation of equipment, causes the person and device security hidden danger.Therefore, how when initialization, keeping its zero-bit stable, avoid the misoperation of actuator, is very crucial problem during the 2D digital servo valve manufactures and designs, and has designed Zero maintaining mechanism for this reason.
The 2D digital servo valve of needs zeroing is loaded on the servovalve test stand; Earlier screw is all unclamped; Manual work adjustment upward escapement, following escapement and zero-bit keeps the feasible escapement down in position of spring roughly to be in the neutral position (promptly to moving axially of two ends stroke about equally being provided to spool) of escapement lower recess; Tighten screw, keep spring compression on cushion block zero-bit, tighten screw subsequently and will go up escapement and be pressed on the motor shaft; Opening power, controller control motor arrives electrical null position automatically, and powers on and to motor certain location torque is provided; The slight rotational valve core of hand adjustment finds the spool corner position that makes that A chamber and B cavity pressure equate, promptly is the mechanical zero of spool; Tighten the zeroing screw then, zeroing is accomplished.
Can see, zero-bit keep spring can the limiting valve mandrel to the degrees of freedom that moves and rotate both direction, thereby keep the zero-bit of spool stable at the initial phase of system, avoid the misoperation of actuator; And when digital valve gets into normal working state; The axial motion of spool is to lean on the difference of the hydraulic coupling at servo screw mechanism two ends to promote; Hydraulic coupling often numerical value is bigger, if the rigidity selection is suitable, the zero-bit maintenance resistance that spring brought can not influence the dynamic performance of valve.
Beneficial effect of the present invention mainly shows: 1, Zero maintaining mechanism is simple in structure, compact; When effectively keeping the spool zero-bit, can play transmission and moment amplification; 2 compare with common gear drive, and this Zero maintaining mechanism rotary inertia is little, helps promoting the dynamic performance of 2D digital servo valve; 3, this Zero maintaining mechanism can play position-limiting action to servovalve when effectively keeping the spool zero-bit, and driving mechanism breaks away from engagement when preventing that the motor corner is excessive; 4, the artificial mechanism zeroing of 2D digital servo valve is convenient in the design of this Zero maintaining mechanism; 5, keep spring rate to select under the suitable situation in zero-bit, this Zero maintaining mechanism can not influence the dynamic performance of 2D digital servo valve.
Description of drawings
Fig. 1 is the structural principle schematic representation of the 2D digital servo valve of band Zero maintaining mechanism.
Fig. 2 is the enlarged diagram of spool valve pocket left end.
Fig. 3 is the structural representation of spool.
Fig. 4 keeps the structural representation of spring for zero-bit.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1～Fig. 4, a kind of Zero maintaining mechanism of 2D digital servo valve comprises that the last escapement 4 that is connected with motor shaft, the following escapement 9 that is connected with spool, swing axis 8 and zero-bit keep spring 14; Said escapement 4 middle parts of going up have the mounting hole that the power supply arbor passes; Said last end-grain cutting of going up escapement 4 has groove, and the said upper end two halves that goes up escapement 4 is fixedly connected, and said lower end of going up escapement 4 has notch; Swing axis 8 is installed in the said notch; Said swing axis 8 one ends stretch in the spacing hole of motor mounting plate, and the said top of escapement 9 down is sleeved on the said swing axis 8 rotationally, and the said bottom of escapement 9 down has the mounting hole that supplies spool to pass; The said following end-grain cutting of escapement 9 down has groove; The lower end two halves of said escapement 9 down is fixedly connected, and said zero-bit keeps the upper end of spring 14 to be fixedly connected with the said bottom of escapement 9 down, and said zero-bit keeps the lower end of spring 14 to be fixedly connected with said motor mounting plate 1.
Said zero-bit keeps the lower end of spring 14 to be installed on the cushion block 15, and said cushion block 15 is fixedly mounted on the said motor mounting plate 1.
In the present embodiment, the 2D digital servo valve comprises compositions such as multipole AC servo motor 6, Zero maintaining mechanism, servo screw mechanism, valve body 31, back shroud 27, right plug ring 33, concentric ring 32, plug 29, motor mounting plate 1, screw 2,3,5,10,12,13,16,17,18,26,28,30,34 and O RunddichtringO 19,20,21,22,23,24.
Said multipole AC servo motor 6 is positioned at valve body 31 upper ends as the electromechanical converter that drives digital valve, is connected with motor mounting plate 1 through screw 2,3,34 etc.
As shown in Figure 1, Zero maintaining mechanism comprises escapement 4, escapement 9, swing axis 8, zero-bit keep spring 14 and cushion block 15 etc. down; End-grain cutting has groove on the last escapement 4, on one side it be a unthreaded hole with hole that screw 5 cooperates, Yi Bian then be tapped hole, so can regulate the relative position between 6 in escapement 4 and the motor easily, and the artificial mechanism that helps the 2D servovalve returns to zero; In two apertures of last escapement bottom, an end is concordant with the escapement end face by solid pressure for swing axis 8, and the other end is then reserved the position-limit mechanism that the spacing hole of certain-length on motor mounting plate 1 constitutes servovalve; The hole that following escapement 9 lower ends have been cut groove and screw 13 cooperations equally is unthreaded hole on one side, Yi Bian then be tapped hole, with the relative position between escapement 9 and the spool 11 under convenient the adjusting, the artificial mechanism that helps the 2D servovalve returns to zero; Last escapement 4 is meshed through swing axis 8 with following escapement 9 and constitutes the moment enlarger of approximate stable drive ratio; Compare with traditional gear drive; It is simple in structure; Rotary inertia is little, in the output torque requirement that has reduced multipole AC servo motor 6, can also promote the dynamic performance of 2D digital servo valve; Go up escapement 4 when preventing that the displacement of motor angle of rotation is excessive and break away from engagement, on motor mounting plate 1, have the spacing hole of circle, constitute the position-limit mechanism of servovalve with swing axis 8 with following escapement 9; Following escapement 9 lower ends link to each other with spool 11, and are fixing through screw 13; It is leaf springs of spring steel that zero-bit keeps spring 14, can make it have moderate rigidity through after the corresponding heat treatment; Zero-bit keeps spring 14 upper ends to be pressed on down in the groove of escapement 9 bottoms through screw 10,12, and the lower end is pressed on the motor mounting plate 1 through screw 16,17 and cushion block 15.
As shown in figures 1 and 3; Servo screw mechanism is the control structure of leading of realizing valve core of servo valve corner and axial straight-line displacement (main valve opening) conversion; It comprises spool 11 and valve pocket 25 etc.; Spool 11 cooperates formation sensitive cavity d with valve pocket 25, back shroud 27, offer two couples of axisymmetric high low pressure hole f and c on the spool 11 shoulder surfaces near sensitive cavity d end; Spool 11 is loaded in the valve pocket 25, passes through sealings such as O RunddichtringO 20,21,22,23,24 between valve pocket 25 and the valve body 31; Concentric ring 32 and right plug ring 33 are housed to guarantee the location between spool 11, valve pocket 25 and the valve body 31 on the spool 11; Offer a pair of axisymmetric spiral chute on the internal surface of valve pocket 25, an end and the sensitive cavity d of this groove communicate, and the other end and high low pressure hole f and c constitute the resistance half-bridge, and the resistance half-bridge is through the pressure in the spiral chute control sensitive cavity d.
The working principle of 2D digital servo valve is following: the right chamber of 2D digital servo valve communicates with oil-feed P mouth (system pressure) through spool 11 bar internal channels and aperture b through aperture a, and its area is the half the of left sensitive cavity d; The pressure of left side sensitive cavity d is controlled with the flowed friction half-bridge that c connects with two crossing small bow-shaped areas of the spiral chute e that is opened in valve pocket 25 internal surfaces by a pair of high low pressure hole f that is opened on the spool 11 left end shoulders.If do not consider the surge influence of power of frictional force and valve port, the pressure of left sensitive cavity d is the half the of P mouth pressure (system pressure) when static state, and spool 11 axially keeps static balances, and the masked area of the both sides, high low pressure hole of intersecting with spiral chute e equates.When direction rotational valve core 11 (to face the spool extension bar) counterclockwise; Then on high-tension side masked area increases, the masked area of low voltage side reduces, and the pressure of left sensitive cavity d raises, and promotion spool 11 moves to right; High low pressure hole f and c get back to the both sides of spiral chute e again simultaneously; Be in the position that both sides, high low pressure hole masked area equates, the pressure recovery of left sensitive cavity d is the half the of P mouth pressure (system pressure), keeps axial force balance; If clockwise direction rotational valve core 11, change then just in time on the contrary, spool 11 is moved to the left; Can see; The converting motion of converting motion between the angle of rotation displacement of spool 11 and the axial straight-line displacement and common mechanical screw mechanism is consistent; Difference is that the axial motion of spool 11 is driven by the hydraulic pressure static pressure, realizes that therefore the displacement of 2D digital servo valve core angle of rotation and the control structure of leading of axially straight-line displacement (main valve opening) conversion are called as the hydraulic servo screw mechanism.
Present embodiment is that the 2D digital servo valve of the 300L flow band Zero maintaining mechanism of 16mm is an example with the valve core diameter, in conjunction with accompanying drawing the present invention is described further.
The working principle of present embodiment: the 2D digital servo valve must make its coincidence to the electrical null position of multipole AC servo motor 6 and the mechanical zero adjustment of spool 11 before coming into operation.The electrical null position adjustment of motor 6 is accomplished in the moment of opening power by controller automatically.And the mechanical zero of spool 11 need be on the servovalve test stand by the manual work adjustment, its process is: open controller power source, controller control motor 6 arrives electrical null positions automatically, and powers on and to motor certain location torque is provided; Unclamp zeroing screw 13, the slight rotational valve core 11 of hand adjustment, under the situation about all blocking in A and B two chambeies, the spool corner position that A chamber and B cavity pressure equate promptly is the mechanical zero of spool 11, tightens zeroing screw 13 then, the completion of returning to zero.
The 2D digital servo valve can come into operation after through the zero-bit adjustment, constitutes the digital electro-hydraulic servo-system.In the initialization procedure of system, generally be to power on for the controller of digital servo valve earlier (this moment, the control signal of motor was zero), drive oil hydraulic pump then and feed hydraulic oil.When the initialization opening power, when the control signal of motor 6 was zero, servovalve should be in closed condition under the perfect condition, and promptly spool 11 should be in strict mechanical zero; Yet owing to the working principle of servo screw mechanism, essence is to be in vacant state freely between spool 11 and the valve pocket 25, considers extraneous random disturbances factor, is difficult to guarantee the mechanical zero that is in of spool 11 strictnesses this moment; If this moment, spool 11 departed from zero-bit slightly, after oil hydraulic pump was opened feeding fluid, based on the working principle of servo screw mechanism, spool 11 can be got back to zero-bit automatically; Yet in this process, fluid might be able to get into a chamber (A chamber or B chamber) of actuator's (oil hydraulic cylinder), causes the unexpected misoperation of equipment, causes the person and device security hidden danger.Therefore, how when initialization, keeping its zero-bit stable, avoid the misoperation of actuator, is very crucial problem during the 2D digital servo valve manufactures and designs, and has designed Zero maintaining mechanism for this reason.
Like Fig. 1 and shown in Figure 4, Zero maintaining mechanism comprises escapement 4, escapement 9, swing axis 8, zero-bit keep spring 14 and cushion block 15 down; The hole that end-grain cutting has groove and screw 5 to cooperate on the last escapement 4 is unthreaded hole on one side, then is tapped hole on one side, so can regulate the relative position between 6 in escapement 4 and the motor easily, and the artificial mechanism that helps the 2D servovalve returns to zero; In two apertures of last escapement bottom, an end is concordant with the escapement end face by solid pressure for swing axis 8, and the other end is then reserved the position-limit mechanism that the spacing hole of certain-length on motor mounting plate 1 constitutes servovalve; The hole that following escapement 9 lower ends have been cut groove and screw 13 cooperations equally is unthreaded hole on one side, Yi Bian then be tapped hole, with the relative position between escapement 9 and the spool 11 under convenient the adjusting, the artificial mechanism that helps the 2D servovalve returns to zero; Last escapement 4 is meshed through swing axis 8 with following escapement 9 and constitutes the moment enlarger of approximate stable drive ratio; Compare with traditional gear drive; It is simple in structure; Rotary inertia is little, in the output torque requirement that has reduced multipole AC servo motor 6, can also promote the dynamic performance of 2D digital servo valve; Go up escapement 4 when preventing that the displacement of motor angle of rotation is excessive and break away from engagement, on motor mounting plate 1, have the spacing hole of circle, constitute the position-limit mechanism of servovalve with swing axis 8 with following escapement 9.Following escapement 9 lower ends link to each other with spool 11, and are fixing through screw 13; It is leaf springs of spring steel that zero-bit keeps spring 14, can make it have moderate rigidity through after the corresponding heat treatment; Zero-bit keeps spring 14 upper ends to be pressed on down in the groove of escapement 9 bottoms through screw 10,12, and the lower end is pressed on the motor mounting plate 1 through screw 16,17 and cushion block 15.
The artificial zeroing process of the 2D digital valve of band Zero maintaining mechanism is following: the 2D digital servo valve that will return to zero is loaded on the servovalve test stand; Earlier screw 5,13,16,17 is all unclamped; Manual work adjustment upward escapement 4, following escapement 9 and zero-bit keeps the feasible escapement 9 down in position of spring 14 roughly to be in the neutral position (promptly to moving axially of two ends stroke about equally being provided to spool) of escapement 4 lower recess; Tighten screw 16,17 and keep spring 14 to be pressed on the cushion block 15 zero-bit, tighten screw 5 subsequently and will go up escapement and be pressed on the motor shaft; Opening power; Controller control motor 6 arrives electrical null positions automatically, and powers on and to motor certain location torque is provided, the slight rotational valve core 11 of hand adjustment; Find the spool corner position that makes that A chamber and B cavity pressure equate; Promptly be the mechanical zero of spool 11, tighten zeroing screw 13 then, zeroing is accomplished.
Can see, zero-bit keep spring 14 can the limiting valve mandrel to the degrees of freedom that moves and rotate both direction, thereby keep the zero-bit of spool 11 stable at the initial phase of system, avoid the misoperation of actuator; And when digital valve gets into normal working state; The axial motion of spool 11 is to lean on the difference of the hydraulic coupling at servo screw mechanism two ends to promote; Hydraulic coupling often numerical value is bigger, if the rigidity selection is suitable, the resistance that zero-bit keeps spring 14 to be brought can not influence the dynamic performance of valve.
Above-mentioned embodiment is used for explaining the present invention, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (6)
1. the Zero maintaining mechanism of a 2D digital servo valve; It is characterized in that: said Zero maintaining mechanism comprises that the last escapement that is connected with motor shaft, the following escapement that is connected with spool, swing axis and zero-bit keep spring, and the said escapement middle part of going up has the mounting hole that the power supply arbor passes, and said last end-grain cutting of going up escapement has groove; The said upper end two halves that goes up escapement is fixedly connected; Said lower end of going up escapement has notch, and swing axis is installed in the said notch, and said swing axis one end stretches in the spacing hole of motor mounting plate; The said top of escapement down is sleeved on the said swing axis rotationally; The said bottom of escapement down has the mounting hole that supplies spool to pass, and the said following end-grain cutting of escapement down has groove, and the said lower end two halves of escapement down is fixedly connected; Said zero-bit keeps the upper end of spring to be fixedly connected with the said bottom of escapement down, and said zero-bit keeps the lower end of spring to be fixedly connected with said motor mounting plate.
2. the Zero maintaining mechanism of 2D digital servo valve as claimed in claim 1 is characterized in that: the said bottom of escapement down is provided with groove, and said zero-bit keeps the upper end of spring to be fixedly mounted in the said groove.
3. the Zero maintaining mechanism of 2D digital servo valve as claimed in claim 2 is characterized in that: two grooves about the bottom of escapement is provided with under said, said zero-bit keep the upper end of spring that two assembly departments are arranged, and said assembly department is fixed in the said groove.
4. like the Zero maintaining mechanism of the described 2D digital servo valve of one of claim 1-3, it is characterized in that: said zero-bit keeps the lower end of spring to be installed on the cushion block, and said cushion block is fixedly mounted on the said motor mounting plate.
5. the Zero maintaining mechanism of 2D digital servo valve as claimed in claim 4; It is characterized in that: the said upper end left-half that goes up escapement has unthreaded hole; The said upper end right half part of going up escapement has tapped hole, and screw passes said unthreaded hole and is installed in the said tapped hole.
6. the Zero maintaining mechanism of 2D digital servo valve as claimed in claim 4; It is characterized in that: the said lower end left-half of escapement down has unthreaded hole; The said lower end right half part of escapement down has tapped hole, and screw passes said unthreaded hole and is installed in the said tapped hole.
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| CN2010101088261A CN101737371B (en) | 2010-02-09 | 2010-02-09 | Zero maintaining mechanism of 2D digital servo valve |
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| CN101737371B true CN101737371B (en) | 2012-05-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438551A (en) * | 2016-08-25 | 2017-02-22 | 浙江工业大学 | Bourdon tube force feedback type 2D electrical-hydraulic pressure servo valve |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297282A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Online zeroing method for proportional valve |
| CN102312877A (en) * | 2011-09-19 | 2012-01-11 | 浙江工业大学 | 2D large-stroke displacement servo operated valve |
| CN103277531A (en) * | 2013-04-27 | 2013-09-04 | 浙江工业大学 | Pre-stretching-pre-twisting type simplified full-bridge 2D electro-hydraulic proportional reversing valve |
| CN103256401A (en) | 2013-04-27 | 2013-08-21 | 浙江工业大学 | Prestretching-pretwisting type full-bridge 2D electro-hydraulic proportional directional valve |
| CN104791316B (en) * | 2015-01-30 | 2016-11-23 | 浙江工业大学 | A kind of pressure direct-detecting mode hand adjustment overflow valve |
| CN106122145B (en) * | 2016-07-19 | 2018-11-06 | 浙江工业大学 | A kind of microminiature 2D electromagnetic switch valves of spring reset |
| CN106122146B (en) * | 2016-07-19 | 2018-05-08 | 浙江工业大学 | The microminiature 2D electromagnetic switch valves that a kind of hydraulic pressure resets |
| CN109489971B (en) * | 2018-11-22 | 2020-01-03 | 燕山大学 | Micro flow measurement system and method for electro-hydraulic servo valve |
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| US3410308A (en) * | 1967-12-05 | 1968-11-12 | Moog Inc | Moving coil electrohydraulic servovalve |
| CN201228805Y (en) * | 2008-07-02 | 2009-04-29 | 浙江工业大学 | Stepwise pneumatic digital valve |
| CN201650907U (en) * | 2010-02-09 | 2010-11-24 | 浙江工业大学 | Zero position holding mechanism of 2D digital servo valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3410308A (en) * | 1967-12-05 | 1968-11-12 | Moog Inc | Moving coil electrohydraulic servovalve |
| CN201228805Y (en) * | 2008-07-02 | 2009-04-29 | 浙江工业大学 | Stepwise pneumatic digital valve |
| CN201650907U (en) * | 2010-02-09 | 2010-11-24 | 浙江工业大学 | Zero position holding mechanism of 2D digital servo valve |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438551A (en) * | 2016-08-25 | 2017-02-22 | 浙江工业大学 | Bourdon tube force feedback type 2D electrical-hydraulic pressure servo valve |
| CN106438551B (en) * | 2016-08-25 | 2018-01-05 | 浙江工业大学 | Bourdon tube force feedback type 2D Electric hydraulic pressure servo valves |
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| CN101737371A (en) | 2010-06-16 |
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Effective date of registration: 20220322 Address after: 310005 No. 1, Wuyi lane, Hushu South Road, Gongshu District, Hangzhou, Zhejiang Patentee after: Hangzhou Diwei Electrohydraulic digital control technology Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310014 City Zhaohui District Six Patentee before: ZHEJIANG University OF TECHNOLOGY |