CN85105425A - Y-type plug-in electro-hydraulic ratio combination valve - Google Patents
Y-type plug-in electro-hydraulic ratio combination valve Download PDFInfo
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Abstract
The present invention is made up of bidirectional current controlled adjuster, two-way high pressure resistant proportionality electromagnet, valve gap, sliding valve style pilot stage, two-way threeway plug-in type flow transducer, two-way threeway plug-in type master selector, end cap and eight parts of receptacle body.It is that both arms involve differential controlled cell combination.It is not only compatible, and four-side-four arm involves controlled and with the advantage of two-way plug-in valve as single armed controlled cell technological scheme, and adopts " flow-displacement-force feedback " reach the new principle of " speed-dynamic pressure feedback ", the static and dynamic performance of raising valve in the valve.Can derive the hand adjustment of threeway plug-in type, electrical feedback proportional combination valve through appropriate change.
Description
The present invention is the direction that belongs to convection cell in the liquid control system, the device that flow is realized proportional control.
Traditional four-side-four arm involves controlled flowed friction basic control unit, as servovalve or the direction Proportional valve of employing with four control limits, see Fig. 1 (a), then can realize motion or power proportional control to two-way performer, but because the resistance of four arm liquid of hydraulic pressure full-bridge places on the same spool, rigidity involves mutually.Lost each arm independence controllability, when engineering is used, lost the possibility that pressure or flow parameter to each controlled cavity volume carry out independently controlling and realizing compound control function and since the quality of guiding valve and size restrictions the dynamic response characteristic of this class valve, be difficult to make the plug-in type structure.
The two-way plug-in valve that grows up at early seventies is the minimum independent component that constitutes any flowed friction control system as a kind of technological scheme of single armed control flowed friction basic control unit.As an elementary cell that independence is controlled, adopt a two-way plug-in valve unit block, can not satisfy in the hydraulic system complete control requirements of parameter such as the direction of a controlled cavity volume and flows.For improving the flow control gain of hydraulic pressure half-bridge, the control of two brachium pontis is intended adopting the synchronization discrepancy flowing mode, adopts a pair of two logical plug-in type series flow control valves to be combined into the hydraulic pressure half-bridge, and this has not only increased the technical difficulty of two arm synchronization control, and not compact on the structure yet, (referring to Fig. 1 (b).
An even more ideal technological scheme is to adopt threeway cartridge valve-both arms to involve differential controlled hydraulic pressure half-bridge basic control unit.See Fig. 1 (c), its compatibility the advantage of above two kinds of technological schemes, compact structure not only, and ride gain increases.If control the direction and the flow of single-acting or double-action differential cylinder, only need such valve with it.It has more on the principle with respect to four-side and two-way plug-in valve and structural rationality, novelty.Special for this reason proposition the present invention.
The present invention is the Y-type plug-in electro-hydraulic ratio combination valve that can work in high-pressure fluid medium.(see figure 2)＜hereinafter to be referred as the electric-hydraulic proportion combination valve 〉, it is made up of eight parts, i.e. bidirectional current controlled adjuster (1); Two-way high pressure resistant proportionality electromagnet (2);＜hereinafter to be referred as proportion electro-magnet〉valve gap (3); The sliding valve style pilot stage; Two-way threeway plug-in type flow transducer; Two-way threeway plug-in type master selector; End cap (5); Receptacle body (4).
Threeway plug-in mounting electric-hydraulic proportion combination valve involves differential controlled hydraulic pressure half-bridge control unit combination as both arms, and its master selector is the threeway plug-in type guiding valve with two control valve ports (27), (28).Its flow transducer also is the threeway plug-in type guiding valve with two control valve ports (35), (36).In order to shorten its axial dimension, be convenient to realize the plug-in type structure, its hydraulic fluid port P mouth (30), A mouth (32) is axial arranged, O mouth (25) radial arrangement, the epicoele of master selector (16) is as the controlled cavity volume of pilot valve control.Master selector spool (26) and flow transducer spool (39) are two-way controlled for the no signal meta.Pilot stage also is to be two-way controlled hydraulic pressure half-bridge with respect to the no signal meta.Valve gap (3) is the adpting flange that pilot stage and proportion electro-magnet (2) and receptacle body (4) join together.End cap (5) is the adpting flange of master selector.
As further description: flow transducer spool (39) and guide's spool (11) coaxial arrangement, feedback spring (46) is arranged therebetween, it makes the flow by flow transducer valve port (35), (36) be converted into displacement Z, the motion compresses of spool (39) or loosen feedback spring (46), this spring force acts on guide's spool (11), balances each other with the electromagnetic force of importing.Realize the loop control theory of " flow-displacement-force feedback " in the valve, make this valve have good steady state controling precision.The present invention simultaneously also is provided with damper (49) between main and pilot stage, realized inter-stage " speed-dynamic pressure feedback ", has improved the dynamic characteristic of valve.
Mechanical centering when in addition, the master selector spool (26) of electric-hydraulic proportion combination valve and flow transducer spool (39) all adopt single spring to realize no signal.Two spring centered mechanisms of conventional direction valve have been replaced.Thereby make the present invention more compact.
If the present invention replaces proportion electro-magnet (2) with a corresponding hand adjustment mechanism (80), can derive hand adjustment ratio combination valve, (see figure 3).
If the present invention detects the displacement signal of flow transducer spool with high pressure resistant displacement transducer, and be converted to voltage signal, feed back on the bidirectional current controlled adjuster, compare, realize the closed loop control of " flow-displacement-electricity feedback " in the valve with input electrical signal.Constitute the electrical feedback proportional combination valve.
Be three kinds of embodiments of the present invention below, description and accompanying drawing by embodiment provide details of the present invention.
Accompanying drawing 2 is organigrams of first embodiment of the present invention.The appellation Y-type plug-in electro-hydraulic ratio combination valve.Parts among the figure (1) are the bidirectional current controlled adjusters, and it supplies with the two-way control electrical signal of proportion electro-magnet (2).Parts (2) are two-way high pressure resistant proportionality electromagnets, and it gives guide's spool (11) input bi-directional electromagnetic power.It has two characteristics, and one is proportional for exporting electromagnetic force and input electrical signal.It is two for when input electrical signal is constant, and the displacement of output electromagnetic force and armature (8) has nothing to do.Valve gap (3) is made hollow, and sliding valve style pilot stage parts are equipped with in its upper end, also have the guide and control runner (12), (13), (48), (52).The upper-end surface of valve gap (3) is connected by screw (7) with proportion electro-magnet (2), pack into the lower end of valve gap (3) of the big end of flow transducer valve pocket (31).Guaranteed concentricity.Valve gap (3) is linked by the left side of screw (9) with receptacle body (4).End cap (5) lower end is a hollow, is used for installing the big end of master selector valve pocket (29), and end cap (5) also has the guide and controls runner (14).End cap (5) is connected by screw (15) with the right-hand part of receptacle body (4).Receptacle body (4) left side, right-hand part are all made hollow, and the left side has runner (33) and A mouth (32), settle two-way threeway plug-in type flow transducer parts in the middle of it.The receptacle body right-hand part is equipped with two-way threeway plug-in type master selector parts in it, and has runner (31), (33) and P mouth (30), O mouth (25), and runner (31) makes threeway plug-in type master selector parts link up mutually with the flow transducer parts.The sliding valve style pilot stage comprises, guide's spool (11), damper (49), cushion block (10), feedback spring (46) and guide's valve pocket (54).Have control valve port (50), (55) on guide's valve pocket (54).Guide's spool (11) is the guiding valve on two controls limit, and cushion block (10) can be adjusted the no signal meta of proportion electro-magnet (2) and guide's spool (11).Two-way threeway plug-in type flow transducer parts comprise, main spring (41), flow transducer valve pocket (37), flow transducer spool (39), nut (43) is adjusted in locking nut (44), (45), upper and lower spring seat (42) and (40), the pull bar (38) of spool (39).Valve port (35) on the flow transducer spool (39), (36) can have trapezoidal or other geometrical shapies according to different requirements.Flow transducer spool (39) is the concentric garden of a secondary post guiding valve, and it is two-way controlled.Adjust nut (43) and can adjust the pre compressed magnitude of main spring (41).Wait other part combination to carry out the mechanical centering function of flow transducer spool (39) by (45), (44), (43), (42), (41), (40), (38).Two-way threeway plug-in type master selector parts comprise, nut (19) is adjusted, main spring (22), upper spring seat (20), lower spring cup (21) in locking nut (17), (18).Pull bar (24), master selector valve pocket (29), master selector spool (26).Have valve port (27), (28) on the master selector valve pocket (29).Master selector spool (26) is the concentric garden of a secondary post guiding valve, and it is two-way controlled.Adjust nut (19) and can adjust the pre compressed magnitude of main spring (22).Wait other part combination to carry out the mechanical centering function of master selector spool (26) by (17), (18), (19), (20), (21), (22), (24).Valve port (35), (36), (27), (28) can be controlled the direction and the flow of system fluid, axial arranged P mouth (30), (25) three hydraulic fluid ports of the O mouth of A mouth (32) and radial arrangement are interfaces of the external oil circuit of Y-type plug-in electro-hydraulic ratio combination valve.
Its working principle is, when the no electrical signal input of proportion electro-magnet (2), and electromagnet no-output power.Guide's spool (11) is in meta under the effect of zeroing spring (6) and feedback spring (46).Guide's fluid through runner (33), (48), through valve port (55), runner (12), flows to O mouth (25) by valve port (50) cavity volume (51) from P mouth (30).The pressure of cavity volume (16) is identical with the pressure of cavity volume (51), runner (14), (13), and the pre-compression force of hydraulic coupling on the master selector spool (26) and spring (22) makes spool (26) also be in meta.Because its valve port (27) and (28) are negative opening, so there is not main flow to flow through valve port (27) or (28).When valve was imported positive electrical signal, at first to the motion of+y direction, valve port (50) turned down guide's spool (11), and valve port (55) increases, the pressure p of controlled cavity volume (16)
3Reduce, master selector spool (26) is at P
1-P
3The pressure difference effect under, move to+directions X, just have fluid to flow to cavity volume (31) and (56) from P mouth (30), cavity volume (56) is communicated with damper (49), cavity volume (47).When stable state, cavity volume (47) equates with the pressure of cavity volume (56), because under the unequal hydraulic coupling and spring force effect that the area difference of flow transducer spool (39) causes, flow transducer spool (39) moves to+Z direction.Fluid at cavity volume (31) arrives A mouth (32) through valve port (35).Obtained like this and the proportional displacement Z of input electrical signal.Because two valve ports (35), (36) of flow transducer are particular design, promptly the flow by valve port (35) or (36) is directly proportional with the displacement Z of flow transducer spool.Therefore also obtain and the proportional main flow Q of input electrical signal
ZThis moment liquid from P mouth (30) to A mouth (32).In like manner, when valve input negative electricity signal, controlled cavity volume pressure p
3Raise, master selector spool (26) moves to-directions X, and valve port (27) is opened.Epicoele (47) height of the pressure ratio flow transducer spool (39) of while A mouth (32), so the flow transducer spool is to the motion of-Z direction, valve port (36) is opened, the liquid of A mouth (32) is through cavity volume (34), arrive cavity volume (31) by valve port (36), cavity volume (56), because the valve port (27) of master selector is opened, so liquid flows to O mouth (25) from A mouth (32); Promptly obtain and the proportional main flow Q of input electrical signal
Z
When system is subjected to external interference, system pressure p for example
1Reduce suddenly, if the positive electrical signal of input is a certain setting, the trend that minimizing is arranged by the flow of valve port (28), the displacement Z of flow transducer spool reduces, the decrement of feedback spring (46) increases, because electromagnetic force is constant, so the valve port of guide's spool (50) turns down, valve port (55) increases, the pressure P of controlled cavity volume (16)
3Reduce,, main flow by valve port (28), (35) is recovered or approach original setting so master selector spool (26) has increased to the displacement of+directions X.The control principle of " flow-displacement-force feedback " in Here it is the valve.The existence of this internal feedback has limited the pressure and the temperature drift of valve characteristic.The electric-hydraulic proportion combination valve has the two-way main flow Q of output
ZWith the proportional characteristic of input electrical signal.When input electrical signal was constant, the bidirectional traffics of its output still can keep constant substantially when load variations, promptly have Flow characteristicss such as level.
(2 〕 ， And remove bidirectional current controlled adjuster (1) and promptly constitute present embodiment with the proportion electro-magnet of hand adjustment mechanism (80) replacement in first embodiment.Accompanying drawing 3 is organigrams of second embodiment of the present invention, appellation threeway plug-in type hand adjustment ratio combination valve.Hand adjustment mechanism (80) comprises, regulating handle (82), adjusting screw rod (83), hand adjustment mechanism body (87), Regulation spring (89), steel ball (90), graduated ring (91), stop screw (81), lock screw (92), O RunddichtringO (85).O RunddichtringO (85) plays the seal action between high pressure cavity volume (93) and zero-pressure chamber (84).Hand adjustment mechanism body (87) is to go up the hollow steel part of below, garden, it with valve gap (3) between connect with screw (86), link to each other with steel ball (90) on the Regulation spring (89), the lower end links to each other with cushion block (10) on guide's spool.Its working procedure is.Adjust adjusting screw rod (83), by steel ball (90) pressure spring (89), this spring force acts on guide's spool (11), and guide's spool (11) is in the no signal meta under the effect of feedback spring (46) and Regulation spring (89).If handle with sleeve (82), handle (82) rotates with screw rod (83), promoting steel ball (90) in axial direction moves, compression or pull-off spring (89), change the active force that imposes on guide's spool (11), so the valve port (50) of guide's spool (11), (55) change, the pressure P of the controlled cavity volume (16) of master selector
3Change.Master selector spool (26) is under two end pressure difference effects, and overcome friction, spring force move.The same with embodiment 1, the valve port (35) of flow transducer spool or (36) are also corresponding opens, just have main flow from the P mouth to the A mouth, or from the A mouth to the O mouth.Regulating handle (82) for hand adjustment mechanism rotates a certain angle along clockwise direction, the main flow that a correspondence just arranged from A mouth (32) to O mouth (25).Equally, regulating handle (82) rotates a certain angle in the counterclockwise direction, the main flow that a correspondence just arranged from P mouth (30) to A mouth (32).The output main stream amount and the rotating angle of handle that are valve are proportional, and its inside also contains the closed loop control new principle of " flow-displacement-force feedback " and inter-stage " speed-dynamic pressure feedback ".Its static and dynamic performance and electric-hydraulic proportion combination valve are similar.
The 3rd embodiment of the present invention as shown in Figure 4, appellation threeway plugged electric feedback proportional combination valve.Compile the new code name the same Fig. 2 of all the other code names except that different with first embodiment parts in addition among the＜present embodiment figure 〉, it is made of ten parts, has increased by two parts than embodiment's scheme of Fig. 2.One is high pressure resistant displacement transducer (61), and it comprises displacement transducer body (64), induction rod (62) and nut (63).High pressure resistant displacement transducer (61) and flow transducer spool (39) coaxial arrangement.It two is measuring amplifier (60).One end of induction rod (62) inserts displacement transducer body (64), and the other end has screw thread to link to each other with nut (63), and the other end of nut (63) is connected with pull bar (38).Like this, flow transducer spool (39) can drive induction rod and moves together.There is a screw end cap (5) upper end, is used to install and fix high pressure resistant displacement transducer body (64).The guide that end cap (5) has controls runner (14) and is communicated with the runner (66) of receptacle body (4).End cap (5) is linked by the left side of screw (15) with receptacle body (4).Pack into the lower end of end cap (5) of the big end of flow transducer valve pocket (37).Have the guide on the valve gap and control runner (71), (70), (69), (68), it is linked by the right-hand part of screw (9) with receptacle body (4).Pack into the lower end of valve gap (3) of the big end of master selector valve pocket (29).Guide in the receptacle body (4) controls runner and is (67), (66).High pressure resistant displacement transducer (61) can detect the displacement signal of flow transducer spool (39), and they are converted to voltage signal linearly, amplify through measuring amplifier (60), feed back to bidirectional current controlled adjuster (1) and upward compare with the input voltage signal of setting, its difference is input to proportion electro-magnet (2) again.Then, the value of the output displacement of automatic modified flow rate sensor spool (39).At last, make output flow sensor shift value Z near or reach desirable setting value.Because the control valve port (35) of flow transducer, the particular design of (36), promptly the flow of the displacement of flow transducer spool (39) and output is proportional, and just the flow of last output is desirable setting flow value.The loop control theory that Here it is so-called " flow-displacement-electricity feedback ".In this scheme, guide's spool (11) and master selector coaxial arrangement use feedback spring (46) to connect therebetween, so the control principle of its double containing " displacement-force feedback ", and damper (32) still plays " speed-dynamic pressure feedback " of inter-stage.
The output bidirectional traffics of present embodiment are proportional with the two-way electrical signal of input, and its output flow is only relevant with its input electrical signal, and when changing for operating load, it is constant substantially that the flow of its output also can keep.Because present embodiment has been Duoed two parts than first embodiment, so manufacture cost increases to some extent.Yet its static properties is better than the electric-hydraulic proportion combination valve.
More than three kinds of embodiments direction that is convection cell, the device that flow is realized control.Its main feature is as follows:
(1) Shu Chu main flow can be two-way, promptly A mouth (32) to O mouth (25) or P mouth (30) to A mouth (32), and continuously, proportional control, can accomplish does not have the zero-bit dead band.When no input electrical signal, no matter how high the pressure of system is, do not have main flow to pass through this valve, protected operating load like this.
(2) static characteristic good linearity, the ring that stagnates is little, the dynamic response frequency f
-3dbSimilar product frequency height than four-side and two-way plug-in valve.
(3) in the engineering hydraulic system of work bandwidth below 20Hz, only with a threeway ratio combination valve can be continuously, ratio ground, control the direction and the speed of single-acting or double-action differential cylinder accurately.Simplified system widely.
(4) this product can be electric-hydraulic proportion control, can be hand adjustment control, can be " force feedback type ", also can be " electricity feedback " formula, adds the Comprehensive Control principle of " displacement-force feedback ".
(5) since it have with servovalve than beautiful control characteristic of steady state with than higher work bandwidth, and cheap, operating pressure differential is low, and working medium is not had the characteristics of specific (special) requirements, makes it might replace the general industry servovalve.To be widely used in operating load and change greatly, in the high engineering hydraulic control system of speed regulation required precision.
Claims (13)
1, convection cell direction, flow control device in the liquid control system, a kind of Y-type plug-in electro-hydraulic ratio combination valve.It comprises bidirectional current controlled adjuster [1], two-way high pressure resistant proportionality electromagnet [2].Feature of the present invention is that it also comprises valve gap [3]; Sliding valve style pilot stage parts; Two-way threeway plug-in type flow transducer parts; Two-way plug-in type master selector parts; End cap [5]; Receptacle body [4].
Above-mentioned sliding valve style pilot stage parts, it comprises cushion block [10], guide's spool [11], guide's valve pocket [54], feedback spring [46], damper [49].
The formula flow transducer is inserted in above-mentioned two-way threeway.It comprises adjusts nut [43].Locking nut [44], [45], upper spring seat [42], main spring [41], lower spring cup [40], flow transducer spool [39], valve pocket [37], flow transducer pull bar [38].
Above-mentioned two-way threeway plug-in type master selector parts, it comprises adjusting nut [19], upper spring seat [20], main spring [22], lower spring cup [21], master selector spool [26].Master selector valve pocket [29], master selector valve core rod [24].Locking nut [17], [18].
2, Y-type plug-in electro-hydraulic ratio combination valve according to claim 1, hollow is all made on wherein above-mentioned valve gap (3), receptacle body (4) left side, have runner (33), (48), (52), (12), (13) and A mouth (32), setting slide valve formula pilot stage parts and two-way threeway plug-in type flow transducer in the middle of it join the valve gap (3) and receptacle body (4) left side together by screw (9).
3, threeway inserting-mounting type electrohydraulic combination valve according to claim 1, hollow is all made on wherein above-mentioned end cap (5), receptacle body (4) right side, have runner (14), O mouth (25), P mouth (30), settle two-way threeway plug-in type master selector parts in the middle of it, by screw (15), the end cap (5) and receptacle body (4) right side are joined together.And has runner (31), and two-way threeway plug-in type flow transducer is linked up mutually with two-way threeway plug-in type master selector parts.
4, Y-type plug-in electro-hydraulic ratio combination valve according to claim 1, wherein above-mentioned two-way threeway plug-in type flow transducer parts, by locking nut (45), (44), adjust nut (43), upper spring seat (42), main spring (41), lower spring cup (40) wait other part combination, carry out the mechanical centering function of flow transducer spool (39).
5, Y-type plug-in electro-hydraulic ratio combination valve according to claim 1, wherein above-mentioned two-way threeway plug-in type master selector parts, by locking nut (17), (18), adjusting nut (19), upper spring seat (20), main spring (22), lower spring cup (21) wait other part combination to carry out the mechanical centering function of master selector spool (26).
6, Y-type plug-in electro-hydraulic ratio combination valve according to claim 1, wherein, above-mentioned two-way threeway plug-in type flow transducer parts are the concentric guiding valves of threeway plug-in type secondary with two control valve ports (35), (36).
7, Y-type plug-in electro-hydraulic ratio combination valve according to claim 1, wherein, above-mentioned two-way threeway plug-in type master selector parts are the concentric guiding valves of threeway plug-in type secondary with two control valve ports (27), (28).
8, Y-type plug-in electro-hydraulic ratio combination valve according to claim 1, wherein, three oil through P mouths (30), the A mouth (32) of above-mentioned receptacle body are axial arranged, O mouth (25) is a radial arrangement.
9, Y-type plug-in electro-hydraulic ratio combination valve according to claim 1, wherein, above-mentioned two-way high pressure resistant proportionality electromagnet (2) replaces with hand adjustment mechanism (80), remove bidirectional current controlled adjuster (1), promptly constitute threeway plug-in type hand adjustment ratio combination valve.
10, according to described Y-type plug-in electro-hydraulic ratio combination valve of claim 1 to 9 or threeway plug-in type hand adjustment ratio combination valve, wherein, above-mentioned guide's spool (11) is a coaxial arrangement with flow transducer spool (39), connect by feedback spring (46), realize the closed loop control of " flow-displacement-force feedback " in the valve.Damper (49) is set between pilot stage and flow transducer, realizes inter-stage " speed-dynamic pressure feedback " control.
11, according to the described Y-type plug-in electro-hydraulic ratio combination valve of claim 1, wherein, increase a measuring amplifier (60) and a high pressure resistant displacement transducer (61), be threeway plugged electric feedback proportional combination valve, high pressure resistant displacement transducer (61) and flow transducer spool (39) coaxial arrangement, detect the displacement of spool (39), realize " flow-displacement-electricity feedback " closed loop control in the valve.Guide's spool (11) and master selector coaxial arrangement connect with spring (46), realize " displacement-force feedback " control, and damper (49) is set between pilot stage and master selector, realize inter-stage " speed-dynamic pressure feedback " control.
12, according to the described three kinds of ratio combination valves of claim 1 to 11, wherein, the valve port (35) on the flow transducer spool (39), (36) have by the difference requirement and have different geometrical shapies.
13, according to the described three kinds of ratio combination valves of claim 1 to 12, that their product form can have is board-like, tubular type and card format.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85105425A CN85105425B (en) | 1985-07-11 | 1985-07-11 | Y-type plug-in electro-hydraulic ratio combination valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85105425A CN85105425B (en) | 1985-07-11 | 1985-07-11 | Y-type plug-in electro-hydraulic ratio combination valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85105425A true CN85105425A (en) | 1987-01-28 |
| CN85105425B CN85105425B (en) | 1987-04-22 |
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ID=4794470
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85105425A Expired CN85105425B (en) | 1985-07-11 | 1985-07-11 | Y-type plug-in electro-hydraulic ratio combination valve |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044634C (en) * | 1996-11-13 | 1999-08-11 | 中国人民解放军第二炮兵工程学院 | Hydraulic system for large erecting equipment |
| CN100485196C (en) * | 2006-02-11 | 2009-05-06 | 中国矿业大学 | Electrohydraulic unloading valve with both hydraulic control mode and electrohydraulic control mode |
| CN101929482A (en) * | 2010-08-25 | 2010-12-29 | 太原理工大学 | Proportional flow valve controlled by pilot flow closed loop |
| CN102588372A (en) * | 2012-03-09 | 2012-07-18 | 太原理工大学 | Electro-hydraulic proportional relief valve |
| CN102840192A (en) * | 2012-06-28 | 2012-12-26 | 三一重工股份有限公司 | System and method for monitoring power of hydraulic system |
| CN103758799A (en) * | 2014-01-26 | 2014-04-30 | 天津大学 | Electric feedback servo hydraulic motor driven by two motors |
| CN109139591A (en) * | 2018-09-25 | 2019-01-04 | 中国农业大学 | A kind of adaptive pilot-operated type electric-hydraulic proportion screw-in cartridge valve of mountain and hill |
-
1985
- 1985-07-11 CN CN85105425A patent/CN85105425B/en not_active Expired
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044634C (en) * | 1996-11-13 | 1999-08-11 | 中国人民解放军第二炮兵工程学院 | Hydraulic system for large erecting equipment |
| CN100485196C (en) * | 2006-02-11 | 2009-05-06 | 中国矿业大学 | Electrohydraulic unloading valve with both hydraulic control mode and electrohydraulic control mode |
| CN101929482A (en) * | 2010-08-25 | 2010-12-29 | 太原理工大学 | Proportional flow valve controlled by pilot flow closed loop |
| CN101929482B (en) * | 2010-08-25 | 2013-04-03 | 太原理工大学 | Proportional flow valve controlled by pilot flow closed loop |
| CN102588372A (en) * | 2012-03-09 | 2012-07-18 | 太原理工大学 | Electro-hydraulic proportional relief valve |
| CN102588372B (en) * | 2012-03-09 | 2014-12-03 | 太原理工大学 | Electro-hydraulic proportional relief valve |
| CN102840192A (en) * | 2012-06-28 | 2012-12-26 | 三一重工股份有限公司 | System and method for monitoring power of hydraulic system |
| CN102840192B (en) * | 2012-06-28 | 2015-03-18 | 三一重工股份有限公司 | System and method for monitoring power of hydraulic system |
| CN103758799A (en) * | 2014-01-26 | 2014-04-30 | 天津大学 | Electric feedback servo hydraulic motor driven by two motors |
| CN103758799B (en) * | 2014-01-26 | 2015-10-28 | 天津大学 | The electric feedback servo oil hydraulic motor of Dual-motors Driving |
| CN109139591A (en) * | 2018-09-25 | 2019-01-04 | 中国农业大学 | A kind of adaptive pilot-operated type electric-hydraulic proportion screw-in cartridge valve of mountain and hill |
| CN109139591B (en) * | 2018-09-25 | 2020-03-10 | 中国农业大学 | Mountain and hill self-adaptation pilot-operated type electro-hydraulic proportional threaded cartridge valve |
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| Publication number | Publication date |
|---|---|
| CN85105425B (en) | 1987-04-22 |
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