CN102305307A - Linear servo device of hydraulic valve and operating method thereof - Google Patents

Linear servo device of hydraulic valve and operating method thereof Download PDF

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Publication number
CN102305307A
CN102305307A CN201110227007A CN201110227007A CN102305307A CN 102305307 A CN102305307 A CN 102305307A CN 201110227007 A CN201110227007 A CN 201110227007A CN 201110227007 A CN201110227007 A CN 201110227007A CN 102305307 A CN102305307 A CN 102305307A
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Prior art keywords
hydrovalve
pwm pulse
armature
spool
average voltage
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CN201110227007A
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CN102305307B (en
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杨龙兴
杨浩轩
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Nantong Huade Metal Forming Machine Co., Ltd.
Jiangsu University of Technology
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Jiangsu University of Technology
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Abstract

The invention belongs to a linear servo device of a hydraulic valve and an operating method thereof. The device comprises a pair of cylinders which are alternately arranged, a first magnet exciting coil and a second magnet exciting coil which are respectively sheathed on the cylinders, a first armature and a second armature which are respectively arranged in the cylinders, and a magnet partition body used for connecting the first armature and the second armature, wherein, the outside end of the first armature is in rigid connection with the valve core of the hydraulic valve; the power supply ends of the first magnet exciting coil and the second magnet exciting coil are respectively connected with a first PWM (pulse-width modulation) pulse direct current (DC) power supply and a second PWM pulse DC power supply; and the first PWM pulse DC power supply and the second PWM pulse DC power supply are connected with an intelligent controller, and the intelligent controller is suitable for controlling average voltage ratio of PWM pulse output by the first PWM pulse DC power supply and the second PWM pulse DC power supply so as to control displacement of the valve core and further control the opening size of the hydraulic valve. The linear servo device provided by the invention has the advantages that the armature cores controlled by the double coils replace a DC proportional electromagnet controlled by a single coil so as to accurately and gradually control the opening size, thus preventing great change of motion sate of the controlled object.

Description

The linear servo device and the method for work thereof of hydrovalve
Technical field
The present invention relates to a kind of linear servo device and method of work thereof of hydrovalve.
Background technique
Control unit in the hydrovalve Hydraulic Power Transmission System is the common components in the commercial production control, is used for direction, pressure and the flow of controlling liquid.It is made up of valve body, spool and liquid flow path etc.That the control of its spool can be adopted is manual, motor-driven, surge, electronic, electricity surges etc., and electronic control is owing to interrelate with control circuit, easily is automated and is widely used.But common solenoid valve is inhaled the moving armature core after adopting coil electricity, drive spool by iron core again and produce motion, again after dead electricity by spring reset armature core and spool, thereby the break-make of control flow.Therefore this controlling method, is controlled the violent change that object can experience motion state usually because the core of the armature in an instant motion impact of energising is bigger, is unfavorable for the accurate control of controlled object state.Especially in the control of Proportional valve; Adopt the unicoil of direct current proportion electro-magnet to control the suction size of armature and the balance method of spring force; Thereby the control openings of sizes reaches the size of proportional control speed, pressure, flow; Be subjected to especially that spring force changes, control accuracy is low, limited the application of Proportional valve.
The principle of existing coil control armature core motion is illustrated in fig. 1 shown below.When field coil D switches on, the magnetic conduction cylinder B and the magnetic guiding loop C that are made by soft magnetic material will be electromagnet by the magnetizes of coil D, and armature C is produced suction, and when the position 1 by Fig. 1 (a) is drawn onto the position 2 of Fig. 1 (b), armature C will no longer move.This movement velocity is uncontrolled, and armature C is very short by the time of 1 arrival equilibrium position 2, position, and control accuracy is low.
Summary of the invention
Technical problem to be solved by this invention provides a kind of linear servo device and method of work thereof of simple in structure, hydrovalve that control accuracy is higher.
For solving the problems of the technologies described above; The linear servo device of hydrovalve of the present invention; Comprise: first, second cylindrical shell of alternate setting; Be sheathed on first, second field coil on first, second cylindrical shell respectively; Be located at first, second armature in said first, second cylindrical shell respectively, be used to connect the separated magnet of first, second armature; The outboard end of first armature and the spool of said hydrovalve are rigidly connected; The power end of first, second field coil links to each other with first, second pwm pulse DC electrical source respectively; First, second pwm pulse DC electrical source and one be suitable for controlling this first, second pwm pulse DC electrical source output pwm pulse average voltage than and the intelligent controller controlling the displacement of said spool and then control the openings of sizes of said hydrovalve links to each other.
Further, for strengthening the Electromagnetic Control effect, said first, second cylindrical shell is a magnetic conductive cylinder, and the two end part of first, second cylindrical shell are connected with first, second magnetic guiding loop respectively.
Further, for guaranteeing to control effect, the coaxial setting of said first, second cylindrical shell; Described is to be used to be rigidly connected the cylindrical body of said first, second armature at a distance from magnet.During practical implementation, be provided with lubricant oil in the cylindrical shell.
The pipeline at said hydrovalve place is provided with the flow transducer of the openings of sizes that links to each other with said intelligent controller, be used to detect said hydrovalve.The openings of sizes of the said hydrovalve of this moment is suitable for calculating through hydraulic pressure value and specific discharge.
 
The method of work of the linear servo device of described hydrovalve, it comprises:
Hydrovalve is under the effect of its Returnning spring, and its initial position is a closed state;
When this hydrovalve of needs unlatching is extremely preset openings of sizes; Intelligent controller is control first earlier; The second pwm pulse DC electrical source is exported respectively by zero and is begun first of enhancing gradually; Second pwm pulse; Simultaneously change first gradually; The average voltage ratio of second pwm pulse; So that said first; Magnetic force on second armature is unbalance and overcome the active force of the Returnning spring in this hydrovalve; And make the spool in this hydrovalve that slowly displacement take place; Slowly to open this hydrovalve; When the opening of this hydrovalve reaches preset size; Keep current said first; The second pwm pulse average voltage ratio; This moment, said spool was said first; Be in the equilibrium position under the effect of second armature, the openings of sizes of said hydrovalve is remained unchanged;
When needs are adjusted the openings of sizes of this hydrovalve; Intelligent controller is adjusted said first, second pwm pulse average voltage ratio gradually; The said spool of this moment is slowly adjusted the equilibrium position under the effect of said first, second armature; When the opening of said hydrovalve reaches required size; Stop to change the average voltage ratio of said first, second pwm pulse, the spool of this moment stops at second equilibrium position;
When needs are closed this hydrovalve; Intelligent controller is corresponding adjusts said first, second pwm pulse average voltage ratio gradually; So that said spool under the effect of said first, second armature slowly to the operating position displacement; When said hydraulic valve closes, stop to export said first, second pwm pulse.
Said intelligent controller detects the openings of sizes of said hydrovalve through said flow transducer, to adjust the average voltage ratio of first, second pwm pulse gradually, in real time, makes the openings of sizes of said hydrovalve remain on preset size.
Compared with prior art; The present invention has the following advantages: it is original that (1) the present invention adopts twin coil control armature core to replace--the direct current proportion electro-magnet of mechanical structure; Can accurately, little by little control the size of opening, avoid being occurred the situation of the violent change of motion state by the control object.Specifically: adopt an intelligent controller to adjust the pwm pulse average voltage ratio of first, second pwm pulse DC electrical source output gradually, to control the openings of sizes of said hydrovalve.
Description of drawings
The structural representation of the linear servo device of the hydrovalve of Fig. 1 (a) and Fig. 1 (b) unicoil control of the prior art armature core motion;
Fig. 2 is the structural representation of the linear servo device of the hydrovalve among the embodiment;
Fig. 3 is in the schematic representation of another location for the armature in the linear servo device among Fig. 2;
Fig. 4 is the structural representation of said linear servo device control spool.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further.
Embodiment 1
Like Fig. 2-4; The linear servo device of the hydrovalve of present embodiment comprises: first, second cylindrical shell 2,12 of alternate setting; Be sheathed on first, second field coil 4,14 on first, second cylindrical shell 2,12 respectively; Be located at first, second armature 3,13 in said first, second cylindrical shell 2,12 respectively, be used to connect the separated magnet 5 of first, second armature 3,13; The spool 7 of the outboard end of first armature 3 and said hydrovalve 6 is rigidly connected; The power end of first, second field coil 4,14 links to each other with first, second pwm pulse DC electrical source respectively; First, second pwm pulse DC electrical source and one be suitable for controlling this first, second pwm pulse DC electrical source output pwm pulse average voltage than and the intelligent controller controlling the displacement of said spool and then control the openings of sizes of said hydrovalve links to each other.
Wherein, the circuit structure and the principle of intelligent controller and first, second pwm pulse DC electrical source can be referring to " the monolithic processor controlled μ s of PIC level pwm pulse Research of Power ", document sources: " electric machining and mould ", 2011 03 phases.
Said first, second cylindrical shell 2,12 is a magnetic conductive cylinder, and the two end part of first, second cylindrical shell 2,12 are connected with first, second magnetic guiding loop 1,11 respectively.
Said first, second cylindrical shell 2,12 coaxial settings; Described at a distance from magnet 5 cylindrical body for said first, second armature 3,13 that is used to be rigidly connected.
The pipeline at said hydrovalve 6 places is provided with the flow transducer of the openings of sizes that links to each other with said intelligent controller, be used to detect said hydrovalve.
Like Fig. 2; First, second armature 3, use between 13 at a distance from magnet 5 (like copper) and be rigidly connected; Under two field coils situation identical with armature; When the pulsed voltage U1 that exports respectively when first, second pwm pulse DC electrical source uses the identical pwm pulse of width to drive first, second field coil respectively with U2 simultaneously; The average voltage of pulsed voltage U1 and U2 equates that the magnetic field suction that is produced also equates; But, do not have axial force to produce, and first armature 3 does not arrive the equilibrium position, receives the effect of axial force to the right, can drive second armature 13 and move right because second armature 13 is balance in the illustrated case.But along with moving right of second armature 13, also be in non-equilibrium site, receive the effect of axial force left, first, second armature 3,13 stop motions reach equilibrium position shown in Figure 3 behind two power equal and opposite in directions.
If the pwm pulse average voltage of the first pulsed voltage U1 is less than the second pulsed voltage U2, the equilibrium position will be moved to the direction of first armature 3 of little average voltage so.Obviously; The pwm pulse average voltage of pulsed voltage U1 and U2 affects the equilibrium position of each armature; The corresponding equilibrium position of each average voltage; Therefore; As long as the pwm pulse average voltage ratio of pulsed voltage U1 and U2 gradually changes; Just slowly move gradually controllably the equilibrium position, reaches the purpose of accurate control.
Spool 7 among Fig. 4 is subjected to the control of first armature 3 to produce side-to-side movement, thus the opening h size through the said hydrovalve 6 of control, and then control inlet flow rate q1 realizes accurately proportional control to what of rate of discharge q2.
(embodiment 2)
The method of work of the linear servo device of described hydrovalve comprises:
Hydrovalve 6 is under the effect of its Returnning spring 8, and its initial position is a closed state;
When needs are opened this hydrovalve 6 to preset openings of sizes; Intelligent controller is control first earlier; The second pwm pulse DC electrical source is exported respectively by zero and is begun first of enhancing gradually; Second pwm pulse; Simultaneously change first gradually; The average voltage ratio of second pwm pulse; So that said first; Second armature 3; Magnetic force on 13 is unbalance and overcome the active force of the Returnning spring 8 in this hydrovalve 8; And make the spool 7 in this hydrovalve 8 that slowly displacement take place; Slowly to open this hydrovalve 8; When the opening of this hydrovalve 8 reaches preset size; Keep current said first; The second pwm pulse average voltage ratio; This moment, said spool was said first; Second armature 3; Be in the equilibrium position under 13 the effect, the openings of sizes of said hydrovalve 6 is remained unchanged;
When needs are adjusted the openings of sizes of this hydrovalve 6; Intelligent controller is adjusted said first, second pwm pulse average voltage ratio gradually; The said spool 7 of this moment is slowly adjusted the equilibrium position under the effect of said first, second armature 3,13; When the opening of said hydrovalve 6 reaches required size; Stop to change the average voltage ratio of said first, second pwm pulse, the spool 7 of this moment stops at second equilibrium position;
When needs are closed this hydrovalve 6; Intelligent controller is corresponding adjusts said first, second pwm pulse average voltage ratio gradually; So that said spool 7 under the effect of said first, second armature slowly to the operating position displacement; When said hydrovalve 6 cuts out, stop to export said first, second pwm pulse.
Said intelligent controller detects the openings of sizes of said hydrovalve 6 through said flow transducer, to adjust the average voltage ratio of first, second pwm pulse gradually, in real time, makes the openings of sizes of said hydrovalve 6 remain on preset size.
The above embodiment of the present invention only is that giving an example that the present invention did is described, and embodiment of the present invention is not limited thereto.The modification of doing for belonging under spirit of the present invention and the principle, combination, simplification, substitute etc. is the equivalence replacement, all still is included within protection scope of the present invention.

Claims (6)

1. the linear servo device of a hydrovalve; It is characterized in that comprising: first, second cylindrical shell of alternate setting; Be sheathed on first, second field coil on first, second cylindrical shell respectively; Be located at first, second armature in said first, second cylindrical shell respectively, be used to connect the separated magnet of first, second armature;
The outboard end of first armature and the spool of said hydrovalve are rigidly connected;
The power end of first, second field coil links to each other with first, second pwm pulse DC electrical source respectively;
First, second pwm pulse DC electrical source and one be suitable for controlling this first, second pwm pulse DC electrical source output pwm pulse average voltage than and the intelligent controller controlling the displacement of said spool and then control the openings of sizes of said hydrovalve links to each other.
2. the linear servo device of hydrovalve according to claim 1, it is characterized in that: said first, second cylindrical shell is a magnetic conductive cylinder, and the two end part of first, second cylindrical shell are connected with first, second magnetic guiding loop respectively.
3. the linear servo device of hydrovalve according to claim 1 is characterized in that: the coaxial setting of said first, second cylindrical shell; Described is to be used to be rigidly connected the cylindrical body of said first, second armature at a distance from magnet.
4. the linear servo device of hydrovalve according to claim 1 is characterized in that: the pipeline at said hydrovalve place is provided with the flow transducer of the openings of sizes that links to each other with said intelligent controller, be used to detect said hydrovalve.
5. the method for work of the linear servo device of the described hydrovalve of one of said claim 1-4 is characterized in that:
Hydrovalve is under the effect of its Returnning spring, and its initial position is a closed state;
When this hydrovalve of needs unlatching is extremely preset openings of sizes; Intelligent controller is control first earlier; The second pwm pulse DC electrical source is exported respectively by zero and is begun first of enhancing gradually; Second pwm pulse; Simultaneously change first gradually; The average voltage ratio of second pwm pulse; So that said first; Magnetic force on second armature is unbalance and overcome the active force of the Returnning spring in this hydrovalve; And make the spool in this hydrovalve that slowly displacement take place; Slowly to open this hydrovalve; When the opening of this hydrovalve reaches preset size; Keep current said first; The second pwm pulse average voltage ratio; This moment, said spool was said first; Be in the equilibrium position under the effect of second armature, the openings of sizes of said hydrovalve is remained unchanged;
When needs are adjusted the openings of sizes of this hydrovalve; Intelligent controller is adjusted said first, second pwm pulse average voltage ratio gradually; The said spool of this moment is slowly adjusted the equilibrium position under the effect of said first, second armature; When the opening of said hydrovalve reaches required size; Stop to change the average voltage ratio of said first, second pwm pulse, the spool of this moment stops at second equilibrium position;
When needs are closed this hydrovalve; Intelligent controller is corresponding adjusts said first, second pwm pulse average voltage ratio gradually; So that said spool under the effect of said first, second armature slowly to the operating position displacement; When said hydraulic valve closes, stop to export said first, second pwm pulse.
6. the method for work of the linear servo device of hydrovalve according to claim 5; It is characterized in that: said intelligent controller detects the openings of sizes of said hydrovalve through said flow transducer; To adjust the average voltage ratio of first, second pwm pulse gradually, in real time, make the openings of sizes of said hydrovalve remain on preset size.
CN 201110227007 2011-08-09 2011-08-09 Linear servo device of hydraulic valve and operating method thereof Active CN102305307B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103674073A (en) * 2012-08-31 2014-03-26 鼎佳(天津)汽车电子有限公司 Three-pole-piece sensor
CN104879551A (en) * 2015-05-22 2015-09-02 南京航空航天大学 Pneumatic proportional valve system based on switch strategy and control method thereof
CN105064807A (en) * 2015-08-06 2015-11-18 苏州好压净化设备有限公司 Multi-coil magnetic levitation electromagnetic motion mechanism and magnetic levitation electromagnetic lock
CN108406051A (en) * 2018-05-22 2018-08-17 江苏理工学院 A kind of weld tracker

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103674073A (en) * 2012-08-31 2014-03-26 鼎佳(天津)汽车电子有限公司 Three-pole-piece sensor
CN104879551A (en) * 2015-05-22 2015-09-02 南京航空航天大学 Pneumatic proportional valve system based on switch strategy and control method thereof
CN105064807A (en) * 2015-08-06 2015-11-18 苏州好压净化设备有限公司 Multi-coil magnetic levitation electromagnetic motion mechanism and magnetic levitation electromagnetic lock
CN108406051A (en) * 2018-05-22 2018-08-17 江苏理工学院 A kind of weld tracker
CN108406051B (en) * 2018-05-22 2021-05-18 江苏理工学院 Welding seam tracking device

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