CN205298131U - Both ends damping variable leads accuse type 2D electric -hydraulic proportional reversing valve - Google Patents
Both ends damping variable leads accuse type 2D electric -hydraulic proportional reversing valve Download PDFInfo
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- CN205298131U CN205298131U CN201620071130.9U CN201620071130U CN205298131U CN 205298131 U CN205298131 U CN 205298131U CN 201620071130 U CN201620071130 U CN 201620071130U CN 205298131 U CN205298131 U CN 205298131U
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- reversing valve
- spool
- elastic helix
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Abstract
The utility model discloses a both ends damping variable leads accuse type 2D electric -hydraulic proportional reversing valve, including switching -over valve, two proportion electro -magnets and two pressure -torsion shaft couplings, every proportion electro -magnet is connected with the case through the pressure -torsion shaft coupling respectively, the pressure -torsion shaft coupling includes first connecting portion, second connecting portion, first elasticity spiral component, second elasticity spiral component, bellows, connecting portion, and the mounting panel, first elasticity spiral component revolves to the same with second elasticity spiral component's. Implement the beneficial effects of the utility model are that: 2D electric -hydraulic proportional reversing valve adopts the structure of pressure -torsion shaft coupling, and when armature promoted the second connecting portion towards moving spool valve, first elasticity spiral component and second elasticity spiral component produced and twist reverse relatively in order to drive first connecting portion rotary motion, and it has zero friction transmission, flexible good, and advantages such as simple and convenient are assembled in small and processing.
Description
Technical field
The utility model relates to electro-hydraulic proportional control system field, more specifically, it relates to a kind of two ends damping type variable leads control type 2D electro-hydraulic proportion reversing valve.
Background technology
Electro-hydraulic proportional valve is adoption rate control techniques, a kind of Hydraulic Elements between switch type hydraulic valve and electrohydraulic servo valve. Owing to electro-hydraulic proportional valve can combine with electronic controls, thus it is convenient to various input, output signal are carried out calculation process, to realize complicated controlling functions. Meanwhile, electro-hydraulic proportional valve has the advantages such as antipollution, low cost and fast response time, obtains a wide range of applications in the industrial production.
Existing electro-hydraulic proportion reversing valve generally can adopt Direct Action Type and lead the design of control type two kinds of structures. Direct action type electrohydraulic proportional reversing valve is by the motion of ratio electro-magnet Direct driver spool, and its structure is simple, and can work under zero pressure, but owing to large discharge control cannot be realized by the restriction of ratio electro-magnet output thrust. Lead control type electro-hydraulic proportion reversing valve to change by the pressure of pilot valve control bound sensitive cavity, produce bigger hydraulic static pressure-driven main valve plug motion, it is possible to realize large discharge control, but its complex structure, and control pressure operation cannot be led zero.
Practical novel content
The technical problems to be solved in the utility model is, for the above-mentioned defect of prior art, it is provided that a kind of high-pressure high-flow, and structure simple two ends damping type variable leads control type 2D electro-hydraulic proportion reversing valve.
The utility model solves the technical scheme that its technical problem adopts: constructs a kind of two ends damping type variable and leads control type 2D electro-hydraulic proportion reversing valve, comprise reversing valve, two ratio electro-magnet being connected to described reversing valve two ends, and two pressures turn round shaft coupling; Described reversing valve comprises valve body, and the spool being arranged in described valve body; Described in each, ratio electro-magnet comprises housing, and the armature being arranged in described housing; Described spool left end shoulder is offered radial symmetry distribution two to left end pressure hole, left end pressure hole is communicated by two with system pressure mouth P mouth;Described spool right-hand member offers with two pairs of left end pressure hole symmetries two to right-hand member pressure hole, and right-hand member pressure hole is communicated by two with system pressure mouth P mouth; Described valve inner has been offered and left experienced passage and right experience passage, described left experience passage and communicates with spool left end sensitive cavity, described right experience passage and communicates with spool right-hand member sensitive cavity; When described 2D electro-hydraulic proportion reversing valve is in the starting position of balance, described left experience passage and two left end pressure hole is formed the first transfer area, described right experience passage and two to right-hand member pressure hole formed the 2nd transfer area, the first transfer area is identical with the 2nd transfer area;
Ratio electro-magnet described in each is turned round shaft coupling by described pressure respectively and is connected with described spool; Pressure described in each turn round shaft coupling comprise the 2nd connection section that the first connection section being fixedly connected with described spool one end is fixedly connected with described armature, be connected to described first connection section and the first elastic helix part between described 2nd connection section and the 2nd elastic helix part, scalable corrugated tube, projection at described 2nd connection section away from the connection section on the outer wall of one end of described first connection section, and the mounting plate being fixedly mounted on described valve body;
Described first connection section is the right cylinder that external diameter is identical with described 2nd connection section; Described first elastic helix part is identical with the rotation direction of described 2nd elastic helix part, and described first elastic helix part and described 2nd elastic helix part respectively the projection on the same end face of described first connection section be separated from each other; Described corrugated tube is sleeved on described first connection section and the outside of described 2nd connection section, one end of described corrugated tube is connected with described mounting plate, the other end of described corrugated tube is connected with described connection section, and described corrugated tube and described spool, described first connection section, described 2nd connection section, and described armature all coaxially arranges; Described first connection section, described 2nd connection section, described first elastic helix part, described 2nd elastic helix part, described corrugated tube, described connection section, and described mounting plate is integrated;
When described armature promote described 2nd connection section towards described valve core movement time, described connection section compresses described corrugated tube, and described first elastic helix part with described 2nd elastic helix part generation relative torsion to drive described first connection section rotary motion.
Leading in control type 2D electro-hydraulic proportion reversing valve at damping type variable in two ends described in the utility model, described corrugated tube is the cylindrical hollow housing with multiple transverse wave.
Leading in control type 2D electro-hydraulic proportion reversing valve at damping type variable in two ends described in the utility model, described mounting plate comprises the plate body in square, and is opened in the through hole at described Ban Ti center; Described first connection section can stretch motion in described through hole.
Leading in control type 2D electro-hydraulic proportion reversing valve at damping type variable in two ends described in the utility model, described 2D electro-hydraulic proportion reversing valve also comprises two springs; The corresponding bullet holder of each spring is between described valve body and described connection section.
Leading in control type 2D electro-hydraulic proportion reversing valve at damping type variable in two ends described in the utility model, described 2D electro-hydraulic proportion reversing valve also comprises two sleeves; Each sleeve correspondence is sleeved on described corrugated tube and the outside of described connection section; One end of sleeve described in each is fixedly connected with described mounting plate, and its other end is connected with described housing.
Leading in control type 2D electro-hydraulic proportion reversing valve at damping type variable in two ends described in the utility model, described sleeve is square hollow structure.
Leading in control type 2D electro-hydraulic proportion reversing valve at damping type variable in two ends described in the utility model, described left end pressure hole and right-hand member pressure hole are the circular through hole of band rectangle deep gouge.
Implement damping type variable in two ends of the present utility model and lead control type 2D electro-hydraulic proportion reversing valve, there is following useful effect: described 2D electro-hydraulic proportion reversing valve adopts pressure to turn round the structure of shaft coupling, when armature promotes the 2nd connection section towards valve core movement, first elastic helix part and the 2nd elastic helix part produce relative torsion to drive the first connection section rotary motion, thus the translational motion of armature is turned into the rotary motion of spool, compared with other electro-hydraulic proportion reversing valve, described 2D electro-hydraulic proportion reversing valve has without friction transmission, flexible, the advantage such as volume is little and process and assemble is easy, moreover, when reversing valve operating pressure is zero or during decompression, owing to now spool axial resistance is almost nil, can directly promote spool by ratio electro-magnet completely, play the feature of direct-acting valve.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the internal structure schematic diagram that the two ends damping type variable that the better embodiment of the utility model provides leads control type 2D electro-hydraulic proportion reversing valve;
Fig. 2 is the A portion enlarged view in Fig. 1;
Fig. 3 is the structure iron that the pressure torsion shaft coupling of two in the 2D electro-hydraulic proportion reversing valve shown in Fig. 1 is connected with spool, armature respectively;
Fig. 4 is the local structural graph that the pressure in the 2D electro-hydraulic proportion reversing valve shown in Fig. 1 turns round shaft coupling;
Fig. 5 is that the pressure in the 2D electro-hydraulic proportion reversing valve shown in Fig. 1 turns round the first elastic helix part of shaft coupling and degree of the disturbing sketch of described 2nd elastic helix part;
Fig. 6 is the structure iron of the spool in the 2D electro-hydraulic proportion reversing valve shown in Fig. 1.
Embodiment
In order to technology feature of the present utility model, object and effect are had understanding clearly, now compare accompanying drawing and embodiment of the present utility model is described in detail. In description of the present utility model, it is to be understood that term " first ", " the 2nd ", " left end ", " right-hand member " etc. are only for describing object, and can not be interpreted as instruction or hint relative importance.
As shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 4, better embodiment of the present utility model provides a kind of two ends damping type variable to lead control type 2D electro-hydraulic proportion reversing valve, and it comprises reversing valve 1, ratio electro-magnet 2, pressure turn round shaft coupling 3, spring 4 and sleeve 5.
Specifically, as shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 6, this reversing valve 1 comprises valve body 11, and the spool 12 being arranged in valve body 11. Left end pressure hole 121 is communicated by offer radial symmetry distribution on this spool 12 left end shoulder two by left end pressure hole 121, two with system pressure mouth P mouth, and A mouth and B mouth are respectively working oil mouth, and T mouth is oil return oil mouth. This spool 12 right-hand member is offered with two pairs of left end pressure hole 121 symmetries two and is communicated with system pressure mouth P mouth equally by right-hand member pressure hole 123 by right-hand member pressure hole 123, two. This valve body 11 inside has been offered and left experienced passage 122 and right experience passage 124, when 2D electro-hydraulic proportion reversing valve is in the starting position of balance, this is left experiences passage 122 and two left end pressure hole 121 is formed the first transfer area, this is right experiences passage 124 and two right-hand member pressure hole 123 is formed the 2nd transfer area, and the first transfer area is identical with the 2nd transfer area. In the present embodiment, left end pressure hole 121 and right-hand member pressure hole 123 are the circular through hole of band rectangle deep gouge.Adopt this structure, it is possible to improve speed gain when spool 12 rotates, finally make the dynamic response of valve faster.
In other embodiment of the present utility model, left end pressure hole 121 and radial 360 degree of right-hand member pressure hole 123 can be 2 or 6, but quantity is necessary for even number. When processing conditions meets, increase the number of left end pressure hole 121 and right-hand member pressure hole 123, speed gain when spool 12 rotates can be improved on the one hand, finally make the dynamic response of valve faster; The control remaining of pilot stage can be increased on the other hand, when a certain or certain some pressure hole block, also have other pressure hole to work. It is necessary for even number, it is ensure that spool 12 is in radial force balance, and processing is easier.
This ratio electro-magnet 2 is provided with two, and two ratio electro-magnet 2 are connected to the two ends of reversing valve 1. Each ratio electro-magnet 2 comprises housing 21, and the armature 22 being arranged in housing 21. In the present embodiment, each ratio electro-magnet is turned round shaft coupling 3 by pressure respectively and is connected with spool 12. Ratio electro-magnet 2 is structure common in prior art, does not repeat them here.
Such as Fig. 2, Fig. 3, Fig. 4 and consult shown in Fig. 1, this pressure turn round shaft coupling 3 for the translational motion of the armature 22 in ratio electro-magnet 2 being turned into the rotary motion of the spool 12 in reversing valve 1. Pressure is turned round shaft coupling 3 and is comprised the first connection section 31, the 2nd connection section 32, first elastic helix part 33, the 2nd elastic helix part 34, corrugated tube 35, connection section 36 and mounting plate 37. First connection section 31, the 2nd connection section 32, first elastic helix part 33, the 2nd elastic helix part 34, corrugated tube 35, connection section 36, and mounting plate 37 is integrated, its globality structure is better, comparatively easy during 2D electro-hydraulic proportion reversing valve described in assembly and disassembly.
Wherein, such as Fig. 4 and consult shown in Fig. 1, Fig. 2, this first connection section 31 is fixedly connected with one end of spool 12, and the 2nd connection section 32 is fixedly connected with armature 22, and the first connection section 31 is the right cylinder that external diameter is identical with the 2nd connection section 32. This first elastic helix part 33 and the 2nd elastic helix part 34 are connected between the first connection section 31 and the 2nd connection section 32, also namely the first elastic helix part 33 is connected to the first connection section 31 both ends of the surface adjacent with the 2nd connection section 32, and the 2nd elastic helix part 34 is connected to the first connection section 31 both ends of the surface adjacent with the 2nd connection section 32 equally. In the present embodiment, first elastic helix part 33 is identical with the rotation direction of the 2nd elastic helix part 34, and first elastic helix part 33 and the 2nd elastic helix part 34 respectively the projection on the same end face of the first connection section 31 be separated from each other, this is projected as fan annular, and two projections are arranged axisymmetricly. This corrugated tube 35 for having the cylindrical hollow housing of multiple transverse wave, its motion of can stretching under the drive of connection section 36. Corrugated tube 35 is sleeved on the first connection section 31 and the outside of the 2nd connection section 32, its one end is connected with mounting plate 37, its the other end is connected with connection section 36, and corrugated tube 35 and spool 12, first connection section 31, the 2nd connection section 32, and armature 22 is all coaxially arranged. This connection section 36 projection is on the outer wall of the 2nd connection section 32 away from one end of the first connection section 31, and in the present embodiment, connection section 36 is circular ring structure. This mounting plate 37 is fixedly mounted on valve body 11, is fixedly mounted on reversing valve 1 so that pressure turns round shaft coupling 3.In the present embodiment, mounting plate 37 comprises the plate body 371 in square, and through hole 372, first connection section 31 being opened in Ban Ti 371 center can stretch motion in through hole 372. When armature 22 promotes the 2nd connection section 32 to move towards spool 12, connection section 36 compress bellows 35, and the first elastic helix part 33 and the 2nd elastic helix part 34 produce relative torsion to drive the first connection section 31 rotary motion.
Consult shown in Fig. 5, in the present embodiment, it may be preferred that the first elastic helix part 33 and the 2nd elastic helix part 34 are that identical structure reverse symmetry is arranged, and its mathematical model is as follows:
X=�� r
L=�� r
Wherein:
��: the first elastic helix part or central angle corresponding to the 2nd elastic helix part end on projection;
R: the first elastic helix part or radius corresponding to the 2nd elastic helix part end on projection;
The central angle that on ��: the first elastic helix part or the 2nd elastic helix part, any one section of spirochete end on projection is corresponding;
X: the arc length that central angle �� is corresponding;
L: the arc length that central angle �� is corresponding;
The angle that ��: the first elastic helix part, the 2nd cross section, elastic helix part x place turn over;
The amount of deflection at the w: the first elastic helix part, the 2nd elastic helix part x place;
The dislocation distance of the ��: the first elastic helix part and the 2nd elastic helix part.
In Fig. 5, �� l is the variable quantity of the arc length that central angle �� is corresponding. Above-mentioned mathematical model reaction pressure can turn round the first elastic helix part 33 in shaft coupling 3 and degree of the disturbing changing conditions after the expansion of the 2nd elastic helix part 34 preferably, the energy of deformation of the first elastic helix part 33 and the 2nd elastic helix part 34 is fitted design requirements more, and pressure is turned round the effect amplified and is reached best.
As shown in Figure 1 and Figure 2, this spring 4 is provided with two, and the corresponding bullet holder of each spring 4 is between valve body 11 and connection section 36. This sleeve 5 is provided with two equally, and each sleeve 5 is sleeved on the outside of corrugated tube 35 with connection section 36, and one end of sleeve 5 is fixedly connected with mounting plate 37, and the other end of sleeve 5 is connected with housing 21. In the present embodiment, sleeve 5 is square hollow structure. Adopt the structure of this sleeve 5, it is possible to make pressure turn round shaft coupling 3 and firmly be connected between reversing valve 1 and ratio electro-magnet 2.
In Fig. 6, described left end pressure hole (121) and described right-hand member pressure hole (123) are the circular through hole of band rectangle deep gouge.
The concrete principle of work of described 2D electro-hydraulic proportion reversing valve: when armature 22 promotes the 2nd connection section 32 to move towards spool 12, due to the structural limitations of corrugated tube 35,2nd connection section 32 can only translational motion, can effectively limit the 32 sections of rotary motions of the 2nd connection section. similar between first elastic helix part 33 and the 2nd elastic helix part 34 is in DNA double spirane structure, this double-spiral structure axile displacement distance, the relation of approximate right-angle triangle two between square edge and hypotenuse is formed between circumference arc length and structure length of run three, obviously, because the length of spirane structure is constant, when the 2nd connection section 32 makes the first connection section 31 and the dislocation of the 2nd connection section 32 change by the push-and-pull effect of armature 22, the camber line distance of the first elastic helix part 33 and the 2nd elastic helix part 34 then must be made to change, namely there is relative torsion in the first elastic helix part 33 and the 2nd elastic helix part 34, thus drive the first connection section 31 rotary motion, to realize the rotary motion that the translational motion of armature 22 is turned into spool 12. such as, when reversing valve 1 right-hand member electro-magnet 2 obtains electric, spool 12 will turn clockwise (from the direction of valve body 11 faced by right-hand member electro-magnet 2), now left end experiences passage 122 and the minimizing of left end pressure hole 121 transfer area, the left cavity pressure decline of spool 12, with reason, now right-hand member experiences passage 124 increases with right-hand member pressure hole 123 transfer area, and the right cavity pressure of spool 12 raises.In the uneven situation of left and right two cavity pressure, spool 12 will move to left, along with spool 12 moves to left, turn round the effect of shaft coupling 3 in pressure under, spool 12 will again be rotated counterclockwise (from the direction of valve body 11 faced by right-hand member electro-magnet 2) and return initial rest position, complete electrical-liquid control. With reason, reversing valve 1 left end electro-magnet 2 obtains electric, and spool 12 will move to right, and complete electrical-liquid control. Compared with other electro-hydraulic proportion reversing valve, the pressure that pressure turns round shaft coupling 3 is turned round switching process and be there is not frictional force and gap, and the distance misplaced or force amplifying function can be adjusted by changing the double-spiral structure parameter of the first elastic helix part 33 and the 2nd elastic helix part 34. Moreover, when reversing valve 1 operating pressure is zero or during decompression, owing to now spool axial resistance is almost nil, can directly promote spool by ratio electro-magnet 2 completely, play the feature of direct-acting valve.
Above in conjunction with accompanying drawing, embodiment of the present utility model is described; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; the those of ordinary skill of this area is under enlightenment of the present utility model; not departing from the utility model objective and in scope situation that claim is protected, also can make a lot of form, these all belong within protection of the present utility model.
Claims (7)
1. a two ends damping type variable leads control type 2D electro-hydraulic proportion reversing valve, it is characterized in that: comprise reversing valve (1), two ratio electro-magnet (2) being connected to described reversing valve (1) two ends, and two pressures turn round shaft coupling (3); Described reversing valve (1) comprises valve body (11), and the spool (12) being arranged in described valve body (11); Described in each, ratio electro-magnet (2) comprises housing (21), and the armature (22) being arranged in described housing (21); Described spool (12) left end shoulder is offered radial symmetry distribution two to left end pressure hole (121), left end pressure hole (121) is communicated by two with system pressure mouth P mouth; Described spool (12) right-hand member offers with two pairs of left end pressure holes (121) symmetries two to right-hand member pressure hole (123), and right-hand member pressure hole (123) is communicated by two with system pressure mouth P mouth; Described valve body (11) inside has been offered and left experienced passage (122) and right experience passage (124), described left experience passage (122) and communicate with spool (12) left end sensitive cavity, described right experience passage (124) and communicate with spool (12) right-hand member sensitive cavity; When described 2D electro-hydraulic proportion reversing valve is in the starting position of balance, described left experience passage (122) and two left end pressure hole (121) is formed the first transfer area, described right experience passage (124) with two to right-hand member pressure hole (123) formed the 2nd transfer area, described first transfer area is identical with described 2nd transfer area;
Ratio electro-magnet (2) described in each is turned round shaft coupling (3) by described pressure respectively and is connected with described spool (12), pressure described in each is turned round shaft coupling (3) and is comprised the first connection section (31) being fixedly connected with described spool (12) one end, the 2nd connection section (32) being fixedly connected with described armature (22), the the first elastic helix part (33) being connected between described first connection section (31) and described 2nd connection section (32) and the 2nd elastic helix part (34), scalable corrugated tube (35), projection at described 2nd connection section (32) away from the connection section (36) on the outer wall of one end of described first connection section (31), and the mounting plate (37) being fixedly mounted on described valve body (11),
Described first connection section (31) and described 2nd connection section (32) are the identical right cylinder of external diameter; Described first elastic helix part (33) is identical with the rotation direction of described 2nd elastic helix part (34), and described first elastic helix part (33) and described 2nd elastic helix part (34) respectively the projection on the same end face of described first connection section (31) be separated from each other; Described corrugated tube (35) is sleeved on the outside of described first connection section (31) with described 2nd connection section (32), one end of described corrugated tube (35) is connected with described mounting plate (37), the other end of described corrugated tube (35) is connected with described connection section (36), and described corrugated tube (35) and described spool (12), described first connection section (31), described 2nd connection section (32), and described armature (22) all coaxially arranges; Described first connection section (31), described 2nd connection section (32), described first elastic helix part (33), described 2nd elastic helix part (34), described corrugated tube (35), described connection section (36), and described mounting plate (37) is integrated;
When described armature (22) promotes described 2nd connection section (32) to move towards described spool (12), described connection section (36) compresses described corrugated tube (35), and described first elastic helix part (33) produces relative torsion to drive the rotary motion of described first connection section (31) with described 2nd elastic helix part (34).
2. damping type variable in two ends according to claim 1 leads control type 2D electro-hydraulic proportion reversing valve, it is characterised in that: described corrugated tube (35) is for having the cylindrical hollow housing of multiple transverse wave.
3. damping type variable in two ends according to claim 1 leads control type 2D electro-hydraulic proportion reversing valve, it is characterized in that: described mounting plate (37) comprises the plate body (371) in square, and it is opened in the through hole (372) at described plate body (371) center; Described first connection section (31) can be stretched motion in described through hole (372).
4. damping type variable in two ends according to claim 1 leads control type 2D electro-hydraulic proportion reversing valve, it is characterised in that: described 2D electro-hydraulic proportion reversing valve also comprises two springs (4); The corresponding bullet holder of each spring (4) is between described valve body (11) and described connection section (36).
5. damping type variable in two ends according to claim 1 leads control type 2D electro-hydraulic proportion reversing valve, it is characterised in that: described 2D electro-hydraulic proportion reversing valve also comprises two sleeves (5); Each sleeve (5) correspondence is sleeved on the outside of described corrugated tube (35) with described connection section (36); One end of sleeve described in each (5) is fixedly connected with described mounting plate (37), and its other end is connected with described housing (21).
6. damping type variable in two ends according to claim 5 leads control type 2D electro-hydraulic proportion reversing valve, it is characterised in that: described sleeve (5) is square hollow structure.
7. damping type variable in two ends according to claim 1 leads control type 2D electro-hydraulic proportion reversing valve, it is characterised in that: described left end pressure hole (121) and right-hand member pressure hole (123) are the circular through hole of band rectangle deep gouge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620071130.9U CN205298131U (en) | 2016-01-25 | 2016-01-25 | Both ends damping variable leads accuse type 2D electric -hydraulic proportional reversing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620071130.9U CN205298131U (en) | 2016-01-25 | 2016-01-25 | Both ends damping variable leads accuse type 2D electric -hydraulic proportional reversing valve |
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| Publication Number | Publication Date |
|---|---|
| CN205298131U true CN205298131U (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620071130.9U Expired - Fee Related CN205298131U (en) | 2016-01-25 | 2016-01-25 | Both ends damping variable leads accuse type 2D electric -hydraulic proportional reversing valve |
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| CN (1) | CN205298131U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605013A (en) * | 2016-01-25 | 2016-05-25 | 浙江大学城市学院 | Two-end damping variable guide control type two-dimensional electro-hydraulic proportional directional valve |
-
2016
- 2016-01-25 CN CN201620071130.9U patent/CN205298131U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605013A (en) * | 2016-01-25 | 2016-05-25 | 浙江大学城市学院 | Two-end damping variable guide control type two-dimensional electro-hydraulic proportional directional valve |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20170125 |
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| CF01 | Termination of patent right due to non-payment of annual fee |