CN101368584A - Novel emergency protection mechanism of three-stage electrohydraulic servo valve - Google Patents
Novel emergency protection mechanism of three-stage electrohydraulic servo valve Download PDFInfo
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- CN101368584A CN101368584A CNA2008101372275A CN200810137227A CN101368584A CN 101368584 A CN101368584 A CN 101368584A CN A2008101372275 A CNA2008101372275 A CN A2008101372275A CN 200810137227 A CN200810137227 A CN 200810137227A CN 101368584 A CN101368584 A CN 101368584A
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Abstract
The invention provides a novel emergency protective mechanism for a three-level electro-hydraulic servo-valve, which comprises a dual-position four-way electromagnetic reversing valve, double hydraulic control stop valve, a floating sleeve, a piston, a piston rod, an adjusting bolt and a nut; the dual-position four-way electromagnetic reversing valve is mounted on a valve block used for mounting the three-level electro-hydraulic servo-valve; the double hydraulic control stop valve is arranged between the guide valve and the valve body of the three-level electro-hydraulic servo-valve; namely, the double hydraulic control stop valve is arranged on the valve body; the floating sleeve, the piston, the piston rod, the adjusting bolt and the nut are mounted on the right end cover of the three-level electro-hydraulic servo-valve. The novel emergency protective mechanism for a three-level electro-hydraulic servo-valve has the advantages of simple structure, convenient implementation, reliable performance, immediate protection, improving the safety of the system greatly, being applicable to a plurality of large devices which apply three-level electro-hydraulic servo-valves, such as a multi-free-degree motion stimulator and a vibration test bench.
Description
(1) technical field
The present invention relates to servovalve emergency protection technology, when being specifically related to the fault of a kind of three-stage electrical fluid servo valve own or it control the Hydrauservo System fault time emergency protection.
(2) technical background
The contour performance equipment of six freedom-degree motion simulator, vibration mechine and load loader adopts three-stage electrical fluid servo valve control oil hydraulic cylinder to be used as the motivational drive part usually, realizes required function by the fore and aft motion of valve control oil hydraulic cylinder.When device fails, need emergency protecting equipment and finish error protection, make equipment be in safe position.
(3) summary of the invention
The object of the present invention is to provide a kind of system failure protection that is used for, improve the novel emergency protection mechanism of three-stage electrohydraulic servo valve of security of system.
The object of the present invention is achieved like this: it comprises two-position four-way solenoid directional control valve, double hydraulic control stop valve, floating bushing, piston, piston rod, adjustment screw bolt and nut, and the two-position four-way solenoid directional control valve is installed in the valve piece that is used to install three-stage electrical fluid servo valve; The double hydraulic control stop valve is installed between the pilot valve and valve body of three-stage electrical fluid servo valve, promptly on the valve body; Floating bushing, piston, piston rod, adjustment screw bolt and nut are installed on the right end cap of three-stage electrical fluid servo valve.
The present invention also has some technical characteristicss like this:
1, described two-position four-way solenoid directional control valve connects pilot valve, double hydraulic control stop valve, floating bushing, piston and the piston rod of three-stage electrical fluid servo valve respectively;
2, described piston is arranged in the outside step of three-stage electrical fluid servo valve right end cap, and piston and piston rod are integrated, and floating bushing is arranged on the piston rod;
3, described piston rod left end has a groove, and piston rod connects the three-stage electrical fluid servo valve spool by the left end groove;
4, the right-hand member of described three-stage electrical fluid servo valve spool is provided with n type hook, and piston rod is connected spool by the left end groove with n type hook;
5, described adjustment bolt passes the right end cap of three-stage electrical fluid servo valve, and it installs nut at the three-stage electrical fluid servo valve right end cap outside one end.
The present invention designed a kind of when being used for the fault of three-stage electrical fluid servo valve own or it control the Hydrauservo System fault time emergency protection mechanism, the safety protection when it can the realization system breaks down.The two-position four-way solenoid directional control valve had both been controlled the fuel feeding of pilot valve, controlled the double hydraulic control stop valve again, also controlled floating bushing, piston and piston rod; The two-position four-way solenoid directional control valve is a standard piece, is easy to buy reliable performance; Floating bushing, piston, piston rod, adjustment screw bolt and nut are installed on the right end cap of three-stage electrical fluid servo valve, and be simple in structure, volume is little, reliable working performance, when the double hydraulic control stop valve guarantees emergency protection about spool two control chambers cavitation phenomenon can not take place.
Under the normal condition, two-position four-way solenoid directional control valve energising, servovalve enables, and pressure oil is pulled to the oil-feed port of pilot valve, and piston and piston rod be to left movement simultaneously, touches the step of right end cap up to the piston left side and stop motion; Floating bushing moves right up to the contact upper piston and by dead.The motion in the certain limit on left and right directions of spool this moment is unrestricted, and pilot valve can be controlled the spool proper motion, and three-stage electrical fluid servo valve can proper functioning.When servovalve fault or system are in an emergency, the outage of two-position four-way solenoid directional control valve, the pilot valve oil-feed port communicates with fuel tank, piston, piston rod and floating bushing acting in conjunction simultaneously is fixed to a certain appropriate location with spool, and this position just makes the piston rod of oil hydraulic cylinder in the system get back to home with certain speed.
The present invention is simple in structure, and it is convenient to realize, reliable performance, and protection is timely, the Security that can improve system greatly.It can be used in many main equipments that use three-stage electrical fluid servo valve, as multifreedom motion simulator, vibration mechine etc.
(4) description of drawings
Fig. 1 hydraulic schematic diagram during for emergency protection mechanism proper functioning of the present invention;
Fig. 2 hydraulic schematic diagram during for emergency protection mechanism emergency protection of the present invention.
(5) embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments:
In conjunction with Fig. 1 and Fig. 2, three-stage electrical fluid servo valve and oil hydraulic cylinder comprise that left end cap 1, valve body 2, valve pocket 3, right-hand member have spool 4, right end cap 5, pilot valve 11, double hydraulic control stop valve 12, replaceable orifice plug 14, replaceable orifice plug 15, the replaceable orifice plug 16 of n type hook, the piston rod 17 of oil hydraulic cylinder; Be provided with spool left side control chamber I, the right control chamber II of spool, floating bushing left side control chamber III, the right control chamber IV of floating bushing (also being piston left side control chamber), the right control chamber V of piston, oil hydraulic cylinder left side control chamber VI, the right control chamber VII of oil hydraulic cylinder in the valve.Present embodiment comprises that two-position four-way solenoid directional control valve 10, double hydraulic control stop valve 12, floating bushing 6, piston 7, left end have piston rod 13 (annotate: piston 7 and piston rod 13 are one), adjustment bolt 8 and the nut 9 of a groove.Two-position four-way solenoid directional control valve 10 is installed in the valve piece that is used to install three-stage electrical fluid servo valve; Double hydraulic control stop valve 12 is installed between pilot valve 11 and the valve body 2, promptly on the valve body 2; Floating bushing 6, piston 7, piston rod 13, adjustment bolt 8 and nut 9 are installed on the right end cap of three-stage electrical fluid servo valve.
1, proper functioning
In conjunction with Fig. 1, two-position four-way solenoid directional control valve 10 when electric, the oil-feed port of pilot valve (P1 mouth) leads to pressure oil; Double hydraulic control stop valve 12 is by making all obstructed fuel tank of two control chambers about spool; Simultaneously pressure oil enters III chamber and V chamber, and the IV chamber leads to fuel tank, and piston and piston rod be to left movement, touches the step of right end cap up to the piston left side and stop motion; Floating bushing moves right up to the contact upper piston and by dead.Groove is at the meta of n type hook at this moment, and also gapped between n type hook and the floating bushing, so spool motion in the certain limit on left and right directions is unrestricted, pilot valve can be controlled the spool proper motion.
2, emergency protection
In conjunction with Fig. 2, during 10 outages of two-position four-way solenoid directional control valve, the oil-feed port of pilot valve (P1 mouth) leads to fuel tank; Double hydraulic control stop valve 12 is opened and is made that two control chambers all lead to fuel tank about spool; The A mouth leads to high pressure, the B mouth leads to fuel tank, just pressure oil enters the IV chamber, and the logical fuel tank in III chamber and V chamber, piston and piston rod move right, floating bushing is to left movement, final piston right side touches the adjustment bolt and can not move, the left groove of floating bushing and piston rod is firmly embraced spool by n type hook and is fixed on some positions (when this position, spool and valve pocket have certain opening), this position is that piston moves right the position that touches when adjusting bolt, just can change the position that spool finally is fixed so change the position of adjusting bolt, can change the size of spool and valve pocket opening.
The position of spool is fixed; controlled by pilot valve; spool and valve pocket have certain opening; pressure oil enters oil hydraulic cylinder left side control chamber (VI) from B1; the right control chamber of oil hydraulic cylinder (VII) is by the logical fuel tank of A1 simultaneously; so just make the piston rod 17 of oil hydraulic cylinder move to home, thereby play the emergency protection effect with certain speed.
When piston rod hauled spool and moves right, double hydraulic control stop valve 12 was opened and is made that two control chambers all lead to fuel tank about spool, thereby prevents that two control chambers produce cavitation phenomenon about spool.
Replaceable orifice plug is used to regulate the speed of emergency protection.
Claims (6)
1. novel emergency protection mechanism of three-stage electrohydraulic servo valve, it is characterized in that it comprises two-position four-way solenoid directional control valve, double hydraulic control stop valve, floating bushing, piston, piston rod, adjustment screw bolt and nut, the two-position four-way solenoid directional control valve is installed in the valve piece that is used to install three-stage electrical fluid servo valve; The double hydraulic control stop valve is installed between the pilot valve and valve body of three-stage electrical fluid servo valve, promptly on the valve body; Floating bushing, piston, piston rod, adjustment screw bolt and nut are installed on the right end cap of three-stage electrical fluid servo valve.
2. novel emergency protection mechanism of three-stage electrohydraulic servo valve according to claim 1 is characterized in that described two-position four-way solenoid directional control valve connects the pilot valve of three-stage electrical fluid servo valve, double hydraulic control stop valve, floating bushing, piston and piston rod respectively.
3. novel emergency protection mechanism of three-stage electrohydraulic servo valve according to claim 2 is characterized in that described piston is arranged in the outside step of three-stage electrical fluid servo valve right end cap, and piston and piston rod are integrated, and floating bushing is arranged on the piston rod.
4. novel emergency protection mechanism of three-stage electrohydraulic servo valve according to claim 3 is characterized in that described piston rod left end has a groove, and piston rod connects the three-stage electrical fluid servo valve spool by the left end groove.
5. novel emergency protection mechanism of three-stage electrohydraulic servo valve according to claim 4 is characterized in that the right-hand member of described three-stage electrical fluid servo valve spool is provided with n type hook, and piston rod is connected spool by the left end groove with n type hook.
6. novel emergency protection mechanism of three-stage electrohydraulic servo valve according to claim 5 is characterized in that described adjustment bolt passes the right end cap of three-stage electrical fluid servo valve, and it installs nut at the three-stage electrical fluid servo valve right end cap outside one end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101372275A CN101368584A (en) | 2008-09-28 | 2008-09-28 | Novel emergency protection mechanism of three-stage electrohydraulic servo valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101372275A CN101368584A (en) | 2008-09-28 | 2008-09-28 | Novel emergency protection mechanism of three-stage electrohydraulic servo valve |
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|---|---|
| CN101368584A true CN101368584A (en) | 2009-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101372275A Pending CN101368584A (en) | 2008-09-28 | 2008-09-28 | Novel emergency protection mechanism of three-stage electrohydraulic servo valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889256A (en) * | 2011-07-22 | 2013-01-23 | 上海航天控制工程研究所 | Triple redundancy servo valve, valve pressure debugging method and assembly used for debugging method |
| CN108779791A (en) * | 2016-03-24 | 2018-11-09 | 株式会社多田野 | Hydraulic system |
| CN114704508A (en) * | 2022-04-13 | 2022-07-05 | 浙江大学 | Multi-margin hydraulic system for electro-hydraulic servo six-degree-of-freedom parallel robot |
-
2008
- 2008-09-28 CN CNA2008101372275A patent/CN101368584A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889256A (en) * | 2011-07-22 | 2013-01-23 | 上海航天控制工程研究所 | Triple redundancy servo valve, valve pressure debugging method and assembly used for debugging method |
| CN102889256B (en) * | 2011-07-22 | 2017-08-29 | 上海航天控制工程研究所 | The component of the method and adjustment method of triplex redundance servo valve and debugging valve pressure |
| CN108779791A (en) * | 2016-03-24 | 2018-11-09 | 株式会社多田野 | Hydraulic system |
| CN114704508A (en) * | 2022-04-13 | 2022-07-05 | 浙江大学 | Multi-margin hydraulic system for electro-hydraulic servo six-degree-of-freedom parallel robot |
| CN114704508B (en) * | 2022-04-13 | 2023-01-24 | 浙江大学 | Multi-margin hydraulic system for electro-hydraulic servo six-degree-of-freedom parallel robot |
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Open date: 20090218 |