CN207728949U - A kind of electro-hydraulic directional control valve spool - Google Patents
A kind of electro-hydraulic directional control valve spool Download PDFInfo
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- CN207728949U CN207728949U CN201721564078.1U CN201721564078U CN207728949U CN 207728949 U CN207728949 U CN 207728949U CN 201721564078 U CN201721564078 U CN 201721564078U CN 207728949 U CN207728949 U CN 207728949U
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- control valve
- directional control
- spool
- hydraulic directional
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Abstract
The utility model discloses a kind of electro-hydraulic directional control valve spool, including connection structure, multiple buffer structures positioned at connection structure one end, the spool active section that is arranged between buffer structure；Connection structure includes spool screw rod, and spool screw rod is located at one end of electro-hydraulic directional control valve spool；Buffer structure includes pressure buffer section one, pressure buffer section two；Spool screw rod is sequentially connected pressure buffer section one, spool active section, pressure buffer section two.The utility model has the advantages that realize that automated job, frictional resistance are small, elliptical gear is small have wide development and application foreground by improving original hydraulicdirectional control valve structure.
Description
Technical field
The utility model is related to hydraulicdirectional control valve technical field, more particularly to a kind of electro-hydraulic directional control valve valve
Core.
Background technology
Hydraulicdirectional control valve is the key core component in Industry Control hydraulic system, it stretches hydraulic actuator oil cylinder
The control action of direction and flow is played in contracting, the positive and negative rotation of hydraulic motor.
Existing hydraulicdirectional control valve is made in valve opening directly by manual, motor-driven or solenoid valve control hydraulic pressure valve core
Line moves, and achievees the purpose that change hydraulic oil direction and hydraulic fluid port opening size with this to control hydraulic valve flow；There are operations
Inconvenience can not achieve automated job, and spool is big by frictional resistance in commutation, and impact force is big under external force for spool
The shortcomings of.
Therefore, how to provide the valve core of hydraulic reversing valve that a kind of frictional resistance is small, elliptical gear is small is people in the art
The problem of member's urgent need to resolve.
Utility model content
In view of this, the utility model provides a kind of electro-hydraulic directional control valve, have that frictional resistance is small, elliptical gear is small
The advantages of.
To achieve the above object, the utility model adopts the following technical solution：
A kind of electro-hydraulic directional control valve spool, including connection structure, multiple buffering knots positioned at described connection structure one end
Structure, the spool active section being arranged between the buffer structure；
The connection structure includes spool screw rod, and the spool screw rod is located at the one of the electro-hydraulic directional control valve spool
End；
The buffer structure includes pressure buffer section one, pressure buffer section two；
The spool screw rod is sequentially connected the pressure buffer section one, the spool active section, the pressure buffer section two.
The hydraulicdirectional control valve of the prior art be all by manually, surge or solenoid valve directly control hydraulic pressure valve core make it is axial
Linear motion controls hydraulic valve flow to achieve the purpose that change hydraulic oil direction and hydraulic fluid port opening size.
Electro-hydraulic directional control valve spool is equipped with spool screw rod in the utility model, in the bull of the spool screw rod and nut
Thread helix connects to form spiral bindiny mechanism, and the spool screw rod connects servo motor output end by screw-drive mechanism,
By the convert rotational motion of servo motor input at the linear motion of electro-hydraulic directional control valve spool, to reach control hydraulic oil
The purpose in direction and flow.In addition, controlling electro-hydraulic directional control valve valve core movement by motor, electro-hydraulic directional control valve is improved
Frequency response.The pressure buffer section of setting reduces the elliptical gear that electro-hydraulic directional control valve spool is generated when motor operates, and makes electricity
The work of hydrodynamic pressure change-over valve core is more steady.
Preferably, the electro-hydraulic directional control valve valve body coordinated with the electro-hydraulic directional control valve spool, the electric hydaulic
Change-over valve core is threaded through in the electro-hydraulic directional control valve valve body.
Preferably, the electro-hydraulic directional control valve valve body and the electro-hydraulic directional control valve spool are clearance fit.It is electronic
Hydraulicdirectional control valve valve body and electro-hydraulic directional control valve spool fit clearance are small, both play sealing function, while also reducing electricity
Frictional force when hydrodynamic pressure change-over valve core commutates, can ensure that electro-hydraulic directional control valve spool is normally made under driving force effect
Industry.
Preferably, the spool active section is provided with multiple, and is spaced apart and is equipped between multiple spool active sections
The logical oily undercut groove of spool.
Preferably, multiple pressure oil passages are equipped between the logical oily undercut groove of the spool and the electro-hydraulic directional control valve valve body
And oil input channel.
Electro-hydraulic directional control valve spool moves axially under the driving of motor, and passes through the logical oily undercut groove of oil input channel and spool
The connection of middle pressure oil passage and the conversion for being closed the various oil ducts of realization.
Preferably, the electro-hydraulic directional control valve valve body is equipped with multiple back oil roads.
Preferably, the both ends of the electro-hydraulic directional control valve spool offer drain path.
Preferably, the drain path is connected to the back oil road, and the fluid in the electro-hydraulic directional control valve spool is logical
It crosses the drain path and flows back into the back oil road.On the one hand, the fluid at electro-hydraulic directional control valve spool both ends is logical by draining
Road flows into the back oil road of valve body, ensures that electro-hydraulic directional control valve spool both ends are in region of no pressure, makes electro-hydraulic directional control valve spool
External force is minimum when for linear motion；On the other hand the outer force transmission mechanism such as bearing of electro-hydraulic directional control valve spool can also be risen
To lubricating action, the service life of electro-hydraulic directional control valve spool is improved.
Preferably, the pressure buffer section two offers rotation stop groove, and the electro-hydraulic directional control valve valve body is equipped with and institute
The corresponding pin hole of rotation stop groove is stated, the pin hole matching is provided with rotation stop pin, and the rotation stop pin is after the pin hole described in insertion
It is slidably connected in rotation stop groove and with the rotation stop groove.Coordinated by the rotation stop groove and the rotation stop pin, prevents the electronic liquid
Pressure change-over valve core rotates under the action of motor, plays the role of being fixedly connected.
On the one hand the utility model constitutes spiral bindiny mechanism, and then and servo motor by the way that spool screw rod and valve body is arranged
Output end connection, the rotary motion of servo motor becomes moving along a straight line by servomotor by screw-drive mechanism, utilizes
The forward and backward of servo motor completes the push pull maneuver of electro-hydraulic directional control valve spool.Reach control hydraulic oil direction to change, adjust
Hydraulic fluid port opening size, using servo motor as power source, improves electronic liquid to control the purpose of hydraulic valve flow
It presses the working efficiency of reversal valve, simplify operating process.On the other hand by the way that pressure buffer section is arranged, to the spool of high-speed motion
Cushioning effect is played in both ends hydraulic fluid pressure impact so that electro-hydraulic directional control valve work is more steady.Simultaneously because electronic liquid
It is clearance fit to press change-over valve core and electrohydraulic steering valve valve opening, and the two fit clearance is small, has not only acted as sealing function,
Also there is very small frictional force simultaneously, frictional resistance is small when can ensure the normal straight line motion of spool, and commutate；In addition exist
Pressure buffer section offers rotation stop groove, coordinates with rotation stop pin on valve body, prevents electro-hydraulic directional control valve spool from making in servo motor
It rotates under.Finally, it is provided at both ends with drain path in electro-hydraulic directional control valve spool, drain path ensures electronic liquid
Pressure change-over valve core both ends are in region of no pressure, and play lubricating action to spool external force transmission mechanism bearing, improve electronic
The service life of valve core of hydraulic reversing valve.
The utility model realizes the automated job of hydraulicdirectional control valve by the improvement to hydraulic valve valve core structure, gram
Original hydraulic valve disadvantage that frictional resistance is big, elliptical gear is big in commutation has been taken, while having also assured that electric hydaulic commutates
Valve core both ends are in region of no pressure, and have carried out lubrication to bearing, improved service life.Therefore there is the utility model friction to hinder
The advantage that power is small, elliptical gear is small has wide development and application foreground.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 attached drawings are the utility model structure diagram；
Fig. 2 attached drawings are the utility model A-A directional profile figures；
Fig. 3 attached drawings are the utility model B-B directional profile figures；
Fig. 4 attached drawings are the utility model embodiment schematic diagram.
In figure：1- servo motors, the first thrust ball bearings of 2-, 3- nuts, the second thrust ball bearings of 4-, 5- servo motors
Seat, 6- electro-hydraulic directional control valve valve bodies, 7- electro-hydraulic directional control valve spools, 8- rotation stop grooves, 9- rotation stop pins, 10- screw plugs, 11- pressures
Power oil channel, 12- spool screw rods, 13- nut inner threads, 14-B mouthfuls of oil input channels, 15-A mouthfuls of oil input channels, 17- back oil roads, 18-
One annular opening slot, 19- the second annular opening slots, 20- pin holes, 211- pressure buffers section one, 212- pressure buffers section two, 22-
Spool active section, the logical oily undercut groove of 23- spools, 24- drain paths.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
The utility model is realized the automated job of hydraulicdirectional control valve, is overcome by the improvement to hydraulic pressure valve arrangement
Original hydraulic valve frictional resistance in commutation is big, the big disadvantage of elliptical gear, while also assuring electro-hydraulic directional control valve valve
Core both ends are in region of no pressure, and have carried out rotary lubrication to bearing.Therefore the utility model has frictional resistance small, elliptical gear
Small advantage has wide development and application foreground.
Please refer to the utility model Figure of description Fig. 1, attached drawing 4：The present embodiment includes electro-hydraulic directional control valve spool 7
And matched electro-hydraulic directional control valve valve body 6, electro-hydraulic directional control valve spool 7 include connection structure, are located at connection structure
Multiple buffer structures of one end, the spool active section 22 being arranged between the buffer structure；
Connection structure includes spool screw rod 12, and spool screw rod 12 is located at one end of electro-hydraulic directional control valve spool 7；
Buffer structure includes pressure buffer section 1, pressure buffer section 2 212；
Spool screw rod 12 is sequentially connected pressure buffer section 1, spool active section 22, pressure buffer section 2 212.
Spool screw rod 12 is connect by nut 3 with servo motor 1.
Servo motor 1 is connected to the axial side of electro-hydraulic directional control valve valve body 6 by servo motor seat 5；Nut 3 is installed
Inside servo motor seat 5, the output shaft of servo motor 1 and the inside of 3 one end of nut are attached by key；Nut 3 is another
The inside at end is threadedly coupled with 7 one end of electro-hydraulic directional control valve spool by nut inner thread 13；3 one end of nut and servo motor
It is equipped with the first thrust ball bearing 2 between 1, the second thrust ball bearing 4 is equipped between 3 other end of nut and servo motor 1；Nut 3
There is the annular opening slot of inside axis direction recess close to the position at its both ends, and be first close to 1 one end of servo motor
Annular opening slot 18 is the second annular opening slot 19 close to 6 one end of electro-hydraulic directional control valve valve body；In first annular open slot
First thrust ball bearing 2 is installed in 18, the second thrust ball bearing 4 is installed in the second annular opening slot 19.
Further, matched electro-hydraulic directional control valve valve body 6 is externally provided in electro-hydraulic directional control valve spool 7, it is described
Electro-hydraulic directional control valve spool 7 is threaded through in the electro-hydraulic directional control valve valve body 6.
Further, electro-hydraulic directional control valve valve body 6 and electro-hydraulic directional control valve spool 7 are clearance fit.Fit clearance is small,
Both sealing function is played, while also reducing frictional force when electro-hydraulic directional control valve spool 7 commutates, can ensure electronic liquid
Press the normal operation under 1 driving effect of servo motor of change-over valve core 7.
Further, spool active section 22 is provided with multiple, and is spaced apart between multiple spool active sections 22 and is equipped with spool
Logical oil undercut groove 23.
It should be noted that：Quantity, the size of the logical oily undercut groove of spool are basis and electro-hydraulic directional control valve spool
The structure setting of the valve body of cooperation, the feature being not limited in the present embodiment attached drawing；
Further, multiple pressure oil passages 11 are equipped between the logical oily undercut groove 23 of spool and electro-hydraulic directional control valve valve body 6.
Further, electro-hydraulic directional control valve valve body 6 includes B mouthfuls of oil input channels 14, A mouthfuls of oil input channels equipped with multiple oil input channels
15。
Electro-hydraulic directional control valve spool 7 moves axially under the driving of servo motor 1, and leads to oily undercut groove 23 by spool
Middle pressure oil passage 11 is connected to and is closed with various oil input channels, realizes the conversion of various oil ducts.
Further, electro-hydraulic directional control valve valve body 6 is equipped with multiple back oil roads 17.
Further, the both ends of electro-hydraulic directional control valve spool 7 offer drain path 24.
Further, drain path 24 is connected to back oil road 17, and the fluid in electro-hydraulic directional control valve spool 7 is logical by draining
Road 24 flows back into back oil road 17.On the one hand, the fluid at 7 both ends of electro-hydraulic directional control valve spool flows into valve body by drain path 24
Back oil road 17, ensure that 7 both ends of electro-hydraulic directional control valve spool are in region of no pressure, electro-hydraulic directional control valve spool 7 made to make straight line
External force is minimum when movement；On the other hand profit can also be played to the outer force transmission mechanism such as bearing of electro-hydraulic directional control valve spool 7
Sliding effect, improves the service life of electro-hydraulic directional control valve spool 7.
Further, pressure buffer section 2 212 offers rotation stop groove 8, and electro-hydraulic directional control valve valve body 6 is equipped with and rotation stop groove
8 corresponding pin holes 20, the matching of pin hole 20 are provided with rotation stop pin 9, rotation stop pin 9 be inserted into rotation stop groove 8 after running through pin hole 20 and with only
Turn trough 8 is slidably connected.Coordinated by rotation stop groove 8 and rotation stop pin 9, prevents the electro-hydraulic directional control valve spool 7 in the work of motor
It rotates under, plays the role of being fixedly connected.
It should be noted that：The device that electro-hydraulic directional control valve rotates is prevented to be not limited to rotation stop groove and rotation stop pin.
Specifically, servo motor 1 drives electro-hydraulic directional control valve workflow as follows：In electro-hydraulic directional control valve is in
When the position of position, servo motor 1 drives servo motor 1 after obtaining PLC or PC controller digital signals.When servo motor 1 is counterclockwise
Rotation drives nut 3 to rotate counterclockwise, in the case where rotation stop pin 9 and rotation stop groove 8 act on, prevents 7 inverse time of electro-hydraulic directional control valve spool
Needle rotates, and therefore, 3 rotation of nut rotated counterclockwise pulls electro-hydraulic directional control valve spool 7 for linear motion, works as electric hydaulic
After change-over valve core 7 reaches designated position, the feedback signal of servo motor 1 passes to PLC or PC controllers, PLC or PC controllers
Control servomotor 1 stops operating, at this point, A mouthfuls of 15 oil inlets of oil input channel, complete hydraulic pressure valve core handoff procedure.
Similarly, in bit positions, servo motor 1 rotates clockwise, and nut 3, which rotates clockwise, pushes electric hydaulic commutation
Valve core 7 moves in a straight line, and when electro-hydraulic directional control valve spool 7 reaches designated position, 1 feedback signal of servo motor passes to PLC
Or PC controllers, PLC or PC controllers control servomotor 1 stop operating.At this point, B mouthfuls of 14 oil inlets of oil input channel, complete hydraulic pressure
Valve core handoff procedure.
It should be noted that：The gear of electro-hydraulic directional control valve control is not limited to the gear in the present embodiment；
In above-mentioned electro-hydraulic directional control valve shift process, electro-hydraulic directional control valve spool 7 will by screw-drive mechanism
The rotary motion of servo motor 1 becomes moving along a straight line, and electro-hydraulic directional control valve is automatically performed using the forward and backward of servo motor 1
The push pull maneuver of spool 7 changes hydraulic oil direction completion shift process to reach.It works in electro-hydraulic directional control valve spool 7
In the elliptical gear that is subject to can be weakened by pressure buffer section, and pass through the drain path on electro-hydraulic directional control valve spool 7 and protect
7 both ends of card electro-hydraulic directional control valve spool are in region of no pressure, while to electro-hydraulic directional control valve spool external force transmission mechanism bearing
Lubricating action is played, the service life of electro-hydraulic directional control valve spool 7 is improved.
On the one hand by improving hydraulicdirectional control valve structure, setting spool screw rod constitutes spiral with valve body and connect the utility model
Mechanism is connect with servo motor output end, and the rotary motion of servo motor is become electricity by servomotor by screw-drive mechanism
The linear motion of hydrodynamic pressure change-over valve core completes the push-and-pull of electro-hydraulic directional control valve spool using the forward and backward of servo motor
Action controls hydraulic valve flow to achieve the purpose that change hydraulic oil direction, adjust hydraulic fluid port opening size, while utilizing servo
Motor realizes automated job as power source, substantially increases the working efficiency of electro-hydraulic directional control valve.On the other hand logical
Setting pressure buffer section is crossed, cushioning effect is played to the spool both ends hydraulic fluid pressure impact of high-speed motion so that electric hydaulic
Reversal valve work is more steady.Again since electro-hydraulic directional control valve spool and electro-hydraulic directional control valve valve body are clearance fit, two
Person's fit clearance is small, not only plays sealing function, but also ensures the normal straight line motion of spool with very small frictional force, and changes
To when frictional resistance it is small；In addition rotation stop groove is offered in pressure buffer section, with rotation stop pin connection on valve body, prevents electric hydaulic from changing
It rotates under servo motor effect to valve core.In addition, it is logical to be provided at both ends with draining in electro-hydraulic directional control valve spool
Road, drain path ensures that electro-hydraulic directional control valve spool both ends are in region of no pressure, and is risen to spool external force transmission mechanism bearing
Lubricating action has been arrived, the service life of electro-hydraulic directional control valve spool is improved.
The present embodiment is hydraulicdirectional control valve used in hydraulic system of loading machine working device, current this hydraulicdirectional control valve
All it is artificial or hydraulic drive valve core movement achievees the purpose that shift.This operation can bring prodigious work strong to driver
Degree, and it is very high to the requirement of the qualification of driver's operation, and not only energy consumption also reduces operating efficiency, most importantly cannot
Realize automated job.
The utility model realizes hydraulicdirectional control valve automated job function by the improvement to hydraulic pressure valve arrangement, improves
Operating efficiency, overcomes that original hydraulic valve frictional resistance in commutation is big, and the big disadvantage of elliptical gear not only reduces electricity
Frictional resistance when hydrodynamic pressure change-over valve core commutates, also reduces electro-hydraulic directional control valve spool under motor high-speed motion
Elliptical gear, while also assuring that electro-hydraulic directional control valve spool both ends are in region of no pressure, and rotation profit has been carried out to bearing
It is sliding.Therefore the utility model has that work efficiency is high, frictional resistance is small, the small advantage of elliptical gear has and wide exploitation and answers
Use foreground.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use this practicality new
Type.Various modifications to these embodiments will be apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest range consistent with features of novelty.
Claims (10)
1. a kind of electro-hydraulic directional control valve spool, it is characterised in that：Including connection structure, positioned at the more of described connection structure one end
A buffer structure, the spool active section (22) being arranged between the buffer structure；
The connection structure includes spool screw rod (12), and the spool screw rod (12) is located at the electro-hydraulic directional control valve spool
(7) one end；
The buffer structure includes pressure buffer section one (211), pressure buffer section two (212)；
The spool screw rod (12) is sequentially connected the pressure buffer section one (211), the spool active section (22), the pressure
Breeze way two (212).
2. a kind of electro-hydraulic directional control valve spool as described in claim 1, it is characterised in that：The spool screw rod (12) passes through company
Fitting is connect with external motor.
3. a kind of electro-hydraulic directional control valve spool as described in claim 1, it is characterised in that：With the electro-hydraulic directional control valve valve
The electro-hydraulic directional control valve valve body (6) of core (7) cooperation, the electro-hydraulic directional control valve spool (7) are threaded through the electric hydaulic
In change valve (6).
4. a kind of electro-hydraulic directional control valve spool as claimed in claim 3, it is characterised in that：The electro-hydraulic directional control valve valve body
(6) and the electro-hydraulic directional control valve spool (7) is clearance fit.
5. a kind of electro-hydraulic directional control valve spool as claimed in claim 4, it is characterised in that：Spool active section (22) setting
Have multiple and spaced apart equipped with the logical oily undercut groove (23) of spool between multiple spool active sections (22).
6. a kind of electro-hydraulic directional control valve spool as claimed in claim 5, it is characterised in that：The logical oily undercut groove (23) of the spool
Multiple pressure oil passages (11) are equipped between the electro-hydraulic directional control valve valve body (6).
7. a kind of electro-hydraulic directional control valve spool as claimed in claim 3, it is characterised in that：The electro-hydraulic directional control valve valve body
(6) multiple back oil roads (17) are equipped with.
8. a kind of electro-hydraulic directional control valve spool as claimed in claim 7, it is characterised in that：The electro-hydraulic directional control valve spool
(7) both ends offer drain path (24).
9. a kind of electro-hydraulic directional control valve spool as claimed in claim 8, it is characterised in that：The drain path (24) with it is described
Back oil road (17) is connected to, and the fluid in the electro-hydraulic directional control valve spool (7) flows back into institute by the drain path (24)
State back oil road (17).
10. a kind of electro-hydraulic directional control valve spool as described in claim 3~9 is any, it is characterised in that：The pressure buffer section
Two (212) offer rotation stop groove (8), and the electro-hydraulic directional control valve valve body (6) is equipped with pin corresponding with the rotation stop groove (8)
Hole (20), pin hole (20) matching are provided with rotation stop pin (9), and the rotation stop pin (9) is inserted into institute afterwards through the pin hole (20)
It states in rotation stop groove (8) and is slidably connected with the rotation stop groove (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721564078.1U CN207728949U (en) | 2017-11-21 | 2017-11-21 | A kind of electro-hydraulic directional control valve spool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721564078.1U CN207728949U (en) | 2017-11-21 | 2017-11-21 | A kind of electro-hydraulic directional control valve spool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207728949U true CN207728949U (en) | 2018-08-14 |
Family
ID=63087853
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|---|---|---|---|
| CN201721564078.1U Active CN207728949U (en) | 2017-11-21 | 2017-11-21 | A kind of electro-hydraulic directional control valve spool |
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| CN (1) | CN207728949U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107883016A (en) * | 2017-11-21 | 2018-04-06 | 黎明液压有限公司 | A kind of electro-hydraulic directional control valve valve element |
-
2017
- 2017-11-21 CN CN201721564078.1U patent/CN207728949U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107883016A (en) * | 2017-11-21 | 2018-04-06 | 黎明液压有限公司 | A kind of electro-hydraulic directional control valve valve element |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An electrohydraulic directional valve spool Effective date of registration: 20221221 Granted publication date: 20180814 Pledgee: Wenzhou minshang Bank Co.,Ltd. Pledgor: CHINA LEEMIN HYDRAULIC Co.,Ltd. Registration number: Y2022980028575 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |