CN1752465A - Digital input type electrohydraulic servo-valve - Google Patents
Digital input type electrohydraulic servo-valve Download PDFInfo
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- CN1752465A CN1752465A CNA2005100197237A CN200510019723A CN1752465A CN 1752465 A CN1752465 A CN 1752465A CN A2005100197237 A CNA2005100197237 A CN A2005100197237A CN 200510019723 A CN200510019723 A CN 200510019723A CN 1752465 A CN1752465 A CN 1752465A
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- fixed orifices
- orifice
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Abstract
The present invention relates to a digital input type electrohydraulic servo valve. Its technical scheme is as follows: a signal input socket is set on the top end of valve cover, said signal input socket is connected with embedded digital servo amplifier mounted in the valve cover interior, said embedded digital servo amplifier is connected with a valve coil, in the valve body a main valve core is mounted, and in the main valve core interior a pilot valve core is mounted, the upper end of said pilot valve core and valve coil are fixedly mounted together, the lower portion of valve coil is equipped with a magnet steel, and upper end and lower end of the valve coil are equipped with reset spring respectively, four fixed orifices are arranged in the form of series-connection, the diameter of orifice is 1-1.2mm, and the oil channel distance of two first fixed orifices and two second fixed orifices is 45-50mm.
Description
One, technical field
The invention belongs to a kind of electrohydraulic control.Relate in particular to a kind of digital input type electrohydraulic servo-valve.
Two, background technique
Electrohydraulic control is the core parts of hydraulic control system, and in industrial extensive application, it can be converted into large-power hydraulic output with low power electric energy input, and equipment is accurately controlled.Electrohydraulic control and servocontroller, Detecting element, actuator, instruction element are used, and can form different open loops or closed loop control system, as position control system, Force control system, speed control system etc.Electrohydraulic control generally can be divided into nozzle baffle type and slide valve electro-hydraulic servo valve, and slide valve electro-hydraulic servo valve can be divided into single-stage sliding valve and secondary guiding valve electrohydraulic control again.
At present, secondary guiding valve electrohydraulic control usually adopts two fixed orifices and two settable orifices to form full-bridges, to the main valve plug position control (Sun Wenzhi. hydraulic control system. Beijing. Beijing National Defense Industry Press, 1985), little because of the hydraulic system damping, the dynamic characteristic of valve is relatively poor; The size of its fixed orifice is less in addition, is stopped up by hydraulic oil internal contamination thing easily.So pollution problem is caused the fault of electrohydraulic servo system by servovalve more than 70%, cause servovalve to lose efficacy, its control accuracy and reliability are reduced, use and be subjected to narrow limitation.
Three, summary of the invention
The present invention seeks on the basis of secondary guiding valve electrohydraulic control, a kind of level of integration height, control accuracy height are provided, respond the digital input type electrohydraulic servo-valve fast, that contamination resistance is strong.
For achieving the above object, the technical solution adopted in the present invention is: the upper end at valve gap is provided with signal input socket, and the signal input socket Embedded Digital Servo amplifier interior with being installed in valve gap is connected, and the Embedded Digital Servo amplifier is connected with valve coil.Main valve plug is housed in valve body, guide's spool is housed in the main valve plug, the upper end and the valve coil of guide's spool are fixedly installed togather, and are provided with magnet steel in the valve coil bottom, have Returnning spring on valve coil.
Four fixed orifices tandem arrangement that takes the shape of the letter U, the processing of two first fixed orifices is at the middle part of main valve plug, the processing of two second fixed orifices is on the top of main valve plug, one first fixed orifice is communicated with one second fixed orifice, communicate with a settable orifice again, another first fixed orifice is communicated with another second fixed orifice, communicates with another settable orifice again.Four fixed restriction bore dias are 1～1.2mm.
The P bore that described two first fixed orifices are processed respectively at main valve plug is on the position, and two second fixed orifices are processed respectively in the main valve plug inboard radial position corresponding with guide's spool convex shoulder; The oil duct distance of two first fixed orifices and two second fixed orifices is 45～50mm.
Described Embedded Digital Servo amplifier is that microprocessor, single-chip microcomputer, communication module, servoamplifier, boost pressure circuit are integrated in the control panel.Servoamplifier is connected with microprocessor, microprocessor is connected with single-chip microcomputer, single-chip microcomputer is connected with communication module, and boost pressure circuit is connected with servoamplifier; Microprocessor is connected with signal input socket respectively with communication module, and servoamplifier is connected with valve coil.The skeleton of valve coil is coated with the banded copper ring of one deck outward, forms the electric convolution damping ring.
Owing to adopt technique scheme, the present invention has level of integration height, control accuracy height, responds the advantage fast, that contamination resistance is strong, is in particular in:
1, the present invention is provided with the Embedded Digital Servo amplifier, has realized integrated with electrohydraulic control.This Embedded Digital Servo amplifier can carry out online self diagnosis to the fault of valve, and can realize remote monitoring and warning by field bus technique.
2, the present invention changes a minor diameter fixed orifice into two larger-diameter fixed orifices on structure, settable orifice pressure reduction significantly can be reduced, the aperture is extended to 1～1.2mm by original 0.7mm, and contamination resistance is greatly improved, and filter precision only needs 10～20 μ m.In addition, selecting the oil duct distance of fixed orifice is 45～50mm, has effectively prevented the influence of jet to fluidised form and restriction effect, makes that the control effect is optimized, servovalve stagnates, and ring is less than normal in 1% less than 3%, zero.
3, the present invention is coated with the banded copper ring of one deck outside the skeleton of valve coil, can produce independently electric eddy current type damping ring, has obtained optimum damping parameter, and its damping constant is reached about 0.7.
Four, description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the structural representation of main valve plug among Fig. 1 [7];
Fig. 3 is the structural representation of Embedded Digital Servo amplifier [2] among Fig. 1;
Five, embodiment
Below in conjunction with embodiment the present invention is further described: Fig. 1 is a kind of structural representation of the present invention.As shown in the figure, be provided with signal input socket [1] in the upper end of this device valve gap [19], signal input socket [1] the Embedded Digital Servo amplifier [2] interior with being installed in valve gap [19] is connected, Embedded Digital Servo amplifier [2] is connected with valve coil [4], Embedded Digital Servo amplifier [2] can carry out online self diagnosis to the fault of this device, and can realize remote monitoring and warning by field bus technique.
Main valve plug [7] is housed in valve body [16], guide's spool [11] is housed in the main valve plug [7], can form the mechanical location feedback.The upper end of guide's spool [11] and valve coil [4] are fixedly installed togather, and the top of guide's spool [11] is threaded with zero-bit adjusting knob [3].Be provided with magnet steel [6] in valve coil [4] bottom, have Returnning spring [18] on valve coil [4], under the action of a magnetic field of magnet steel [6], energising valve coil [4] produces thrust and drives guide's spool [11] generation axial displacement.
For preventing the influence of jet to fluidised form and restriction effect, this device as shown in Figure 2, adopt four fixed orifices [14], [15], [9], [13] tandem arrangement that takes the shape of the letter U, two first fixed orifices [14], [15] process the middle part in main valve plug [7], two second fixed orifices [9], [13] process the top in main valve plug [7], first fixed orifice [14] is communicated with second fixed orifice [9], communicates with settable orifice [10] again; First fixed orifice [15] is communicated with second fixed orifice [13], communicates with settable orifice [12] again.U-shaped 4 hole tandem arrangement can significantly reduce settable orifice [10], [12] pressure reduction.
Two first fixed orifices [14] and [15] process P bore at main valve plug [7] respectively on the position, and two second fixed orifices [9] and [13] process respectively in main valve plug [7] the inboard radial position corresponding with guide's spool [11] convex shoulder.First fixed orifice [14], [15] are 45～50mm with the oil duct distance of second fixed orifice [9], [13].
In order to increase the resistance of pilot stage liquid, four fixed orifices [14], [15], [9], [13] enlarged-diameter are 1～1.2mm, can strengthen contamination resistance simultaneously.
The Embedded Digital Servo amplifier [2] of this device is integrated in microprocessor [24], single-chip microcomputer [21], communication module [22], servoamplifier [25], boost pressure circuit [20] in the control panel [23] as shown in Figure 3.Servoamplifier [25] is connected with microprocessor [24], microprocessor [24] is connected with single-chip microcomputer [21], single-chip microcomputer [21] is connected with communication module [22], and boost pressure circuit [20] is connected with servoamplifier [25]; Microprocessor [24] is connected with signal input socket [1] respectively with communication module [22], and servoamplifier [25] is connected with valve coil [4].
In Embedded Digital Servo amplifier [2], set up boost pressure circuit [20], can reduce the influence of the inertial element of valve coil [4] resistance and valve coil [4] inductance composition greatly, the frequency band of broadening servoamplifier [25].
In addition, be coated with the banded copper ring [5] of one deck outside the skeleton of valve coil [4], can form the electric convolution damping ring, can improve the damping of guide's spool [11], the damping constant of this device pilot stage is reached about 0.7, dynamic stability obviously improves.
The working principle of this device is: the control figure signal is delivered to Embedded Digital Servo amplifier [2] from signal input socket [1], be transported to valve coil [4] by producing corresponding control current after the computing, under the action of a magnetic field of magnet steel [6], energising valve coil [4] produces thrust and drives guide's spool [11] generation axial displacement, the orifice size of settable orifice [10] and [12] is changed, and the liquid resistance is asymmetric; The while guide controls oil and decides throttle orifice [14], [15] and second level fixed orifice [9], [13] by main valve plug [7] last first, flows back to low pressure port T through settable orifice [10] and [12], constitutes U-shaped full-bridge control oil channel.The orifice size of settable orifice [10] and [12] changes, and the liquid resistance is asymmetric, causes U-shaped full-bridge imbalance, thereby causes that both sides guide's control-oil pressure does not wait.The guide controls oil and enters main valve plug [7] two ends through control oil duct [8] and [17] again, makes main valve plug [7] axially loaded imbalance, and generation moves axially, and the valve port of main valve plug [7] is changed, thereby control working connection flow changes.When main valve plug [7] axial displacement with after guide's spool [11] axial displacement equates, the orifice size of settable orifice [10] and [12] has equated again, liquid resistance symmetry, U-shaped full-bridge balance, both sides guide's control-oil pressure equates that main valve plug [7] axially loaded restores balance, and axial motion stops, the valve port opening of main valve plug [7] remains unchanged, and the working connection flow also remains unchanged.
Claims (5)
1, a kind of digital input type electrohydraulic servo-valve, it is characterized in that being provided with signal input socket [1] in the upper end of valve gap [19], signal input socket [1] the Embedded Digital Servo amplifier [2] interior with being installed in valve gap [19] is connected, Embedded Digital Servo amplifier [2] is connected with valve coil [4], main valve plug [7] is housed in valve body [16], guide's spool [11] is housed in the main valve plug [7], the upper end of guide's spool [11] and valve coil [4] are fixedly installed togather, be provided with magnet steel [6] in valve coil [4] bottom, on valve coil [4], have Returnning spring [18];
Four fixed orifices [14], [15], [9], [13] tandem arrangement that takes the shape of the letter U, two first fixed orifices [14], [15] process the middle part in main valve plug [7], two second fixed orifices [9], [13] process the top in main valve plug [7], first fixed orifice [14] is communicated with second fixed orifice [9], communicates with settable orifice [10] again; First fixed orifice [15] is communicated with second fixed orifice [13], communicates with settable orifice [12] again.
2, digital input type electrohydraulic servo-valve according to claim 1, it is characterized in that described two first fixed orifices [14] and [15] process P bore at main valve plug [7] respectively on the position, two second fixed orifices [9] and [13] process respectively in main valve plug [7] the inboard radial position corresponding with guide's spool [11] convex shoulder; Two first fixed orifices [14], [15] are 45～50mm with the oil duct distance of two second fixed orifices [9], [13].
3,, it is characterized in that described fixed orifice [14], [15], [9], [13] diameter are 1～1.2mm according to claim 1 or 2 described digital input type electrohydraulic servo-valves.
4, digital input type electrohydraulic servo-valve according to claim 1 is characterized in that described Embedded Digital Servo amplifier [2] is with microprocessor [24], single-chip microcomputer [21], communication module [22], servoamplifier [25], boost pressure circuit [20], is integrated in the control panel [23]; Servoamplifier [25] is connected with microprocessor [24], microprocessor [24] is connected with single-chip microcomputer [21], single-chip microcomputer [21] is connected with communication module [22], and boost pressure circuit [20] is connected with servoamplifier [25]; Microprocessor [24] is connected with signal input socket [1] respectively with communication module [22], and servoamplifier [25] is connected with valve coil [4].
5, digital input type electrohydraulic servo-valve according to claim 1 is characterized in that the skeleton of described valve coil [4] is coated with the banded copper ring [5] of one deck outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100197237A CN100348873C (en) | 2005-11-03 | 2005-11-03 | Digital input type electrohydraulic servo-valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100197237A CN100348873C (en) | 2005-11-03 | 2005-11-03 | Digital input type electrohydraulic servo-valve |
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| CN1752465A true CN1752465A (en) | 2006-03-29 |
| CN100348873C CN100348873C (en) | 2007-11-14 |
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| CNB2005100197237A Expired - Fee Related CN100348873C (en) | 2005-11-03 | 2005-11-03 | Digital input type electrohydraulic servo-valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213243A (en) * | 2011-06-01 | 2011-10-12 | 武汉科技大学 | Composite high-efficiency high-flow servo valve |
| CN103615423A (en) * | 2013-12-04 | 2014-03-05 | 中国航空工业第六一八研究所 | Electro-hydraulic servo valve sleeve locating structure |
| CN111404493A (en) * | 2020-04-26 | 2020-07-10 | 广东海洋大学 | Electro-hydraulic servo valve digital amplifier with safety protection and built-in test function |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839364B (en) * | 2010-04-29 | 2012-01-18 | 浙江工业大学 | Chatter compensation method for hysteresis-loop nonlinearity of digital-valve transmission mechanism |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4378031A (en) * | 1979-05-22 | 1983-03-29 | Koehring Company | Electrohydraulic servovalve |
| GB2158971A (en) * | 1984-02-22 | 1985-11-20 | Koehring Co | Digital servovalve structure and method |
| LU88558A1 (en) * | 1994-11-16 | 1996-07-15 | Hydrolux Sarl | Pilot operated servo valve |
| US5573036A (en) * | 1996-01-11 | 1996-11-12 | Sargent Controls & Aerospace/Dover Diversified Inc. | Electro-hydraulic servovalve having mechanical feedback |
| JP3904288B2 (en) * | 1997-05-30 | 2007-04-11 | 株式会社トキメック | Electro-hydraulic servo valve |
| CN2572033Y (en) * | 2002-09-16 | 2003-09-10 | 刘长青 | Two-stage electrohydraulic digital servo valve |
-
2005
- 2005-11-03 CN CNB2005100197237A patent/CN100348873C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213243A (en) * | 2011-06-01 | 2011-10-12 | 武汉科技大学 | Composite high-efficiency high-flow servo valve |
| CN102213243B (en) * | 2011-06-01 | 2014-03-26 | 武汉科技大学 | Composite high-efficiency high-flow servo valve |
| CN103615423A (en) * | 2013-12-04 | 2014-03-05 | 中国航空工业第六一八研究所 | Electro-hydraulic servo valve sleeve locating structure |
| CN111404493A (en) * | 2020-04-26 | 2020-07-10 | 广东海洋大学 | Electro-hydraulic servo valve digital amplifier with safety protection and built-in test function |
| CN111404493B (en) * | 2020-04-26 | 2024-04-09 | 广东海洋大学 | Electrohydraulic servo valve digital amplifier with safety protection and built-in test functions |
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| CN100348873C (en) | 2007-11-14 |
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