CN108547823A - A kind of rebound jetting type deflector electrohydraulic servo valve - Google Patents
A kind of rebound jetting type deflector electrohydraulic servo valve Download PDFInfo
- Publication number
- CN108547823A CN108547823A CN201810509716.2A CN201810509716A CN108547823A CN 108547823 A CN108547823 A CN 108547823A CN 201810509716 A CN201810509716 A CN 201810509716A CN 108547823 A CN108547823 A CN 108547823A
- Authority
- CN
- China
- Prior art keywords
- deflector
- valve
- servo valve
- rebound
- jet stream
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Servomotors (AREA)
Abstract
The present invention relates to a kind of rebound jetting type deflector electrohydraulic servo valves, including：Fluidic device：Setting is coupled in valve body with driving device, including jet stream disk, the oil back chamber being arranged in jet stream disk and the deflector with ω shape slots being arranged in oil back chamber；Power stage：Including the guiding valve being arranged in valve pocket, to control fluid flow direction and adjust pressure and flow；Feedback device：To feedback offset, including feedback rod, described feedback rod one end is connect with valve core of the spool valve, and the other end is connect with deflector；Driving device：Including the torque-motor and armature component being arranged on valve body, to drive deflector to shift, and then the spool of guiding valve is driven.Compared with existing deflector servo valve, the present invention eliminates the V-groove in deflector using rebound mode of jet, has many advantages, such as that reliability is higher, long lifespan.
Description
Technical field
The present invention relates to fluid control technology fields, more particularly, to a kind of rebound jetting type deflector electrohydraulic servo valve.
Background technology
Deflector jet servo valve appears in the 1970s, Moog companies of the U.S. in 1967 have researched and developed deflector
Jet servo valve is (referring to patent document：Mcfadden,Edward F,Williams,Leonard J.Free jet stream
deflector valve:US 3542051[P],1970-11-24).Compared with jet pipe servo valve, deflector servo valve
Major advantage is that the vibration being likely to occur in structure, simple in structure, reliable operation need not be eliminated around property fuel feed pump.Partially
The critical component of guide plate jet servo valve is deflector and jet stream disk, and structure has a direct impact the dynamic and static characteristic of servo valve,
Therefore occurs the patent of a collection of research deflector and jet stream dish structure in succession, it is intended to improve deflector jet servo valve prestage
Output characteristics.
1964, W.T.Swinehart researched and developed a kind of divided fluid stream valve, and fluid diverter is provided with V-type and square
The window that shape is combined is (referring to patent document：W.T.Swinehart.Control Valve with fluid diverter:
US 3362423[P],1968-1-9).October nineteen sixty-eight, F.E.Hill have researched and developed the local derviation plate valve with feedback device,
It is same using being provided with V-type and the deflector of window that rectangle is combined is (referring to patent document：F.E.Hill.Fluid
control valve with feedback:US 3405727[P],1968-10-15).1972, Morton Robert O
Solid deflector is placed between jet orifice and receiving port, by the movement of deflector be switched off and on jet orifice and receiving port it
Between oil circuit, in addition, change deflector cross sectional shape, effect when controlling liquid flow of comparison rectangle, trapezoidal, triangular-section
Fruit (referenced patent document：Morton Robert O.Fluid control valve:US 3866620A[P],1975-2-
18).1981, Stanley J.Hoffman, Jr. et al. proposed to improve local derviation harden structure, more using being opened up on deflector
The mode of a V-shape window mouth improves jet stream state (referring to patent document：Stanley J.Hoffman,Jr.,William
D.Waffner.Fail-safe single-stage servovalve:US 4442855A[P],1984-4-17).2004,
Muchlis Achmad are improved the structure of jet pipe servo valve, eliminate the flexible fuel feed pump of jet pipe servo valve, will
Jet orifice and receiving port are arranged in homonymy, and the mobile control that slotted deflector is cut by top enters the flow of receiving port, this
Kind of structure actually also belongs to deflector jet servo valve, but the deflector of its Weight type due to quality it is big so that servo valve is rung
Speed is answered to reduce (referring to patent document：Muchlis Achmad.Methods and apparatus for splitting
and directing a pressurized fluid jet within a servovalve:US 20060216167A1,
2006-9-28)。
2015, Tongji University Models-and-options credit health cares found deflector servo valve jet stream prestage flow field model, and proposition is taken appropriate
It reduces inlet pressure and improves the measures such as deflector lower face fillet processing quality to improve prestage cavitation (referring to paper
Document：Models-and-options credits are protected, Zhang Peng, Cen Bin deflectors the flow field analysis of jet servo valve prestage [J] China Construction Machinery journals, and 2015
(1),1-7).In the same year, Tongji University Models-and-options credits are protected requires solid in low and fluid for jet servo valve to oil cleanliness
The problem of grain object high-speed jet easy tos produce parts depreciation, carries out erosive wear numerical simulation, using computational fluid dynamics
(CFD) theoretical with erosion, erosive wear mathematical model is established, erosive wear rule is obtained, is easy to be rushed at receiver splitter
Erosion abrasion is (referring to paper document：Models-and-options credits are protected, Fu Jiahua, golden precious jade orchid jet pipe servo valves prestage erosive wear numerical simulation
[J] journal of Zhejiang university (engineering version), 2015,49 (12), 2252-2260).2016, Models-and-options credits, which are protected, proposed that a kind of jet pipe is watched
Valve nozzle and the receiver hole centering method of inspection are taken, the torque-motor of servo valve is mounted on nozzle centering Test bench, simultaneously
Injection stream inspection panel is correspondingly arranged below Test bench in nozzle pair；When according to non-Loading Control electric current, from servo valve
Jet impulse point position and torque-motor Loading Control electricity of the jet impulse column of nozzle transmitting on injection stream inspection panel
After stream, the deviating track of jet impulse column jet impulse point position on injection stream inspection panel judges nozzle and servo valve
Whether whether centering and servo valve occur bias drift failure (referring to patent document for two receiver holes：Models-and-options credits are protected, Li Changming,
Open a kind of jet pipe servo valve nozzles of sun and the receiver hole centering method of inspection：CN 2016105344156,2016-7-8).2017
Year, Lanzhou University of Science ＆ Technology Zhang Shuowen is to the V-arrangement water conservancy diversion window angle of jet deflection plate servo valve prestage to prestage flow field, two
Receiver hole pressure difference and the Wear rate of prestage carry out numerical analysis, propose that the increase of V-type water conservancy diversion window angle can reduce mill
Loss rate is (referring to paper document：Simulation study [D] of Zhang Shuowen jet deflection plate servo valve valve port erosions and valve characteristic variation is blue
State：Lanzhou University of Science ＆ Technology, 2017).
Currently, the deflector jet servo valve that exploitation uses mostly uses greatly the local derviation harden structure for being provided with V-shape window mouth, to this
For structure, during the work time, when deflector V-shape window mouth occur block or abrasion when, can influence servo valve flow and
Pressure gain, while servo valve zero bias phenomenon can be caused, or even cause servo defective valve.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of rebound jetting type is inclined
Guide plate electrohydraulic servo valve.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of rebound jetting type deflector electrohydraulic servo valve, including：
Fluidic device：Setting is coupled in valve body with driving device, including jet stream disk, the oil back chamber that is arranged in jet stream disk
And the deflector with ω shape slots being arranged in oil back chamber；
Power stage：Including the guiding valve being arranged in valve pocket, to control fluid flow direction and adjust pressure and flow；
Feedback device：To feedback offset, including feedback rod, described feedback rod one end is connect with valve core of the spool valve, separately
One end is connect with deflector；
Driving device：Including the torque-motor and armature component being arranged on valve body, to drive deflector to shift,
And then drive the spool of guiding valve.
Preferably, the jet stream disk is in flat disc, and upper end cover and bottom end cover is respectively set in both ends, the jet stream disk
Inside offers the oil back chamber of the rounded rectangle in section, and the deflector is the column plate of the rounded rectangle in section, and sets
It sets in oil back chamber, receiving channel and fluidic channel is additionally provided on the jet stream disk.
Preferably, there are two the receiving channel is set, there are one the fluidic channel is set, fluidic channel is located at local derviation
On the center line of plate, and face vertical with deflector front surface, two receiving channels difference it is oblique and with center line for symmetrical axial symmetry
Setting is opposite with deflector front surface in fluidic channel both sides, and respectively.
Preferably, described fluidic channel one end is connected to oil back chamber, and the other end is connect with oil-feed port, two receiving channels
One end is connected to oil back chamber, and the other end is connect with the both ends of valve pocket internal spool valve spool respectively.
Preferably, the front surface in deflector is arranged in the ω shape slots, the semi-cylindrical groove opened up side by side for twice, and two
Junction forms shunting and splits in the middle part of road semi-cylindrical groove, and in the case of no offset, which splits face vertical with fluidic channel.
Preferably, which further includes the oil return opening and load port being connected to valve pocket, there are two the load port is set.
Preferably, the armature component is connect by the external rod piece for being arranged bourdon tube with deflector.
Preferably, the radius of the semi-cylindrical groove is more than the width of receiving channel and fluidic channel outlet.
Compared with existing deflector servo valve technology, the deflector that tradition is provided with V-arrangement channel by the present invention replaces with ω shapes
The deflector of slot；The human body shape jet stream disk that conventional fluidic channel and receiving channel are distributed in both sides replaces with fluidic channel and connects
The inversion pawl font jet stream disk that channel is distributed in homonymy is received, is had the following advantages and beneficial effect：
(1) traditional deflector uses V-shape window mouth, and the outlet size of V-shape window mouth is smaller, if V-shape window mouth blocks,
Servo valve cisco unity malfunction；And the deflector for the jet flow type that rebounds eliminates V-shape window mouth, and blockage problem is not present, and improves work
The reliability of work.
(2) ω shapes slot is convenient for surface Hardening Treatment, enhances erosion resistance ability, extends servo valve working life.
(3) compared with Weight type deflector servo valve, deflector quality of the present invention is small, and response speed is faster.
Description of the drawings
Fig. 1 is the structural schematic diagram of the servo valve of the present invention.
Fig. 2 is the schematic cross-section of existing servo valve jet stream disk and deflector.
Fig. 3 is the structural schematic diagram of existing servo valve jet stream disk upper end cover.
Fig. 4 is the structural schematic diagram of existing servo valve jet stream disk bottom end cover.
Fig. 5 is the structural schematic diagram of existing servo valve deflector.
Fig. 6 is the schematic cross-section of the servo valve jet stream disk and deflector of the present invention.
Fig. 7 is the structural schematic diagram of servo valve jet stream disk upper end cover of the present invention.
Fig. 8 is the structural schematic diagram of servo valve jet stream disk bottom end cover of the present invention.
Fig. 9 is the structural schematic diagram of servo valve deflector of the present invention.
Figure 10 is the connection diagram of servo valve feedback rod of the present invention and guiding valve and deflector.
Figure 11 is Weight type deflector servo valve structural schematic diagram.
Description of symbols in figure：
1- torque-motors；2- armature components；3- deflectors；4- feedback rods；5- jet stream disks；6- guiding valves；7- load ports；8- is supplied
Hydraulic fluid port；9- oil return openings；The existing deflectors of 10-；11-V shape windows；The existing jet stream disks of 12-；13- oil back chambers；The existing jet stream disks of 14-
Upper end cover；The existing jet stream disk bottom end covers of 15-；16- receiving channels；17- fluidic channels；18- upper end covers；19- bottom end covers；20- points
Stream is split；21- semi-cylindrical grooves.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present invention provides a kind of rebound jetting type deflector servo valve, as shown in Figure 1, include torque-motor 1, jet stream disk 5,
Deflector 3, feedback rod 4 and guiding valve 6, torque-motor 1 are equipped with armature component 2, and jet stream disk 5 is equipped with oil back chamber 13, and deflector 3 is arranged
In the oil back chamber 13 of jet stream disk 5, such as Fig. 6-10, jet stream disk 5 is flat disc, and 5 both ends of jet stream disk are respectively equipped with upper end cover
18 and bottom end cover 19, oil back chamber 13 is arranged in the centre of jet stream disk 5, the rounded rectangle in 13 section of oil back chamber, and deflector 3 is flat
Long blocky, the rounded rectangle in section of deflector 3, deflector 3 is equipped with corresponding with receiving channel 16 and fluidic channel 17
Semi-cylindrical groove 21, servo valve are equipped with oil return opening 9 and two load ports 7.3 top of deflector connects armature component 2, under deflector 3
Portion connects feedback rod 4, the spool of the other end connection guiding valve 6 of feedback rod 4, and guiding valve 6 is set in the valve pocket of the servo valve, jet stream disk
5 are equipped with the receiving channel 16 and fluidic channel 17 of connection oil back chamber 13, and receiving channel 16 is respectively communicated to 6 both sides of guiding valve, jet stream
Channel 17 connects oil-feed port 8, by oil sources fuel feeding.
In the present embodiment, there are two receiving channel 16 is set, there are one fluidic channel 17 is set, deflector 3, receiving channel 16 with
In " pawl " font is inverted, fluidic channel 17 opens up twice half between receiving channel 16 on deflector 3 in fluidic channel 17 section
Cylindrical groove 21, two semi-cylindrical grooves side by side form ω shape slots, the end of ω shapes slot and receiving channel 16 and fluidic channel 17
Mouth is corresponding, and the centre of ω shape slots is that shunting splits 20, when deflector 3 is in an intermediate position, and 20 and fluidic channel 17 are split in shunting
Port is arranged bourdon tube to just, being connected by rod piece between deflector 3 and armature component 2 outside rod piece.Fluidic channel 17 and local derviation
3 anterior-posterior plane of plate is vertical, and the radius of semi-cylindrical groove 21 is slightly larger than receiving port width, and ω shapes slot runs through deflector up and down.
The operation principle of this servo valve is as follows：
Faint electric signal is enlarged into hydraulic pressure signal by deflector, hydraulic pressure signal amplification is input to and subsequently holds by guiding valve
Row mechanism, feedback rod feed back to the mechanical force that the displacement of guiding valve generates on the armature component of torque-motor.When torque-motor 1 is defeated
After entering non-zero signal, armature component 2 generates deflector 3 effect of power, and deflector 3 deviates centre position, fluidic channel 17
Incident fluid is reflected into receiving channel 16, the left-right asymmetry generation pressure difference of fluid through deflector semi-cylindrical groove 21, and driving is slided
Valve core moves, and guiding valve 6 deviates centre position and exports corresponding discharge, while the displacement of spool drives feedback rod 4, feeds back to torque
Motor 1, when the torque of torque and torque-motor that feedback component generates balances each other, deflector just returns in two receiving channels
Between near some equilbrium position, realize the SERVO CONTROL of output flow, such as Figure 10, deflector and armature component and feedback rod it
Between using welding by the way of be coupled.
Existing jet stream disk 12 is distributed in the structure type of 10 both sides of existing deflector using jet orifice with receiving channel, such as schemes
2-4,12 upper and lower side of jet stream disk are equipped with jet stream disk upper end cover 14 and jet stream disk bottom end cover 15, and only there are one jet orifices to work；Therewith
The deflector for being provided with V-shape window mouth 11 to match is easy to happen blocking, causes servo defective valve, such as Fig. 5.The deflector of Weight type by
It is big in quality so that servo valve response speed reduces, such as Figure 11.The deflector that tradition is provided with V-arrangement channel by the present invention replaces with
The deflector of ω shape slots；The human body shape jet stream disk that conventional fluidic channel and receiving channel are distributed in both sides replaces with fluidic channel
It is distributed in the inversion pawl font jet stream disk of homonymy with receiving channel, has the following advantages：Traditional deflector uses V-shape window mouth, V
The outlet size of shape window is smaller, if V-shape window mouth blocks, servo valve cisco unity malfunction；And the jet flow type that rebounds is inclined
Guide plate eliminates V-shape window mouth, and blockage problem is not present, improves the reliability of work.Meanwhile ω shape slots are convenient for surface treatment,
Enhance erosion resistance ability, extends servo valve working life.
The above-mentioned description to embodiment can be understood and applied the invention for ease of those skilled in the art.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to embodiments here, originally
Field technology personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in the protection models of the present invention
Within enclosing.
Claims (8)
1. a kind of rebound jetting type deflector electrohydraulic servo valve, which is characterized in that including：
Fluidic device：Setting is coupled in valve body with driving device, includes the oil return of jet stream disk (5), setting in jet stream disk (5)
Chamber (13) and the deflector (3) with ω shape slots being arranged in oil back chamber (13)；
Power stage：Including the guiding valve (6) being arranged in valve pocket, to control fluid flow direction and adjust pressure and flow；
Feedback device：To feedback offset, including feedback rod (4), the feedback rod (4) one end connects with guiding valve (6) spool
It connects, the other end is connect with deflector (3)；
Driving device：Including the torque-motor (1) being arranged on valve body and armature component (2), to drive deflector (3) to occur
Offset, and then drive the spool of guiding valve (6).
2. a kind of rebound jetting type deflector electrohydraulic servo valve according to claim 1, which is characterized in that the jet stream
Disk (5) is in flat disc, and upper end cover (18) and bottom end cover (19) is respectively set in both ends, is offered inside the jet stream disk (5)
The oil back chamber (13) of the rounded rectangle in section, the deflector (3) is the column plate of the rounded rectangle in section, and is arranged
In oil back chamber (13), receiving channel (16) and fluidic channel (17) are additionally provided on the jet stream disk (5).
3. a kind of rebound jetting type deflector electrohydraulic servo valve according to claim 2, which is characterized in that the reception
There are two channel (16) is set, there are one the fluidic channel (17) is set, fluidic channel (17) is located at the center line of deflector (3)
On, and face vertical with deflector (3) front surface, two receiving channels (16) are oblique respectively and are that symmetrical axial symmetry is set with center line
It sets in fluidic channel (17) both sides, and opposite with deflector (3) front surface.
4. a kind of rebound jetting type deflector electrohydraulic servo valve according to claim 3, which is characterized in that the jet stream
Channel (17) one end is connected to oil back chamber (13), and the other end is connect with oil-feed port (8), two receiving channel (16) one end with return
Oil pocket (13) is connected to, and the other end is connect with the both ends of valve pocket internal spool valve (6) spool respectively.
5. a kind of rebound jetting type deflector electrohydraulic servo valve according to claim 3, which is characterized in that the ω shapes
The front surface in deflector (3) is arranged in slot, and for the semi-cylindrical groove (21) that twice open up side by side, twice semi-cylindrical groove middle part connects
The place of connecing forms shunting and splits (20), and in the case of no offset, which splits (20) face vertical with fluidic channel (17).
6. a kind of rebound jetting type deflector electrohydraulic servo valve according to claim 1, which is characterized in that the servo valve is also
Include the oil return opening (9) being connected to valve pocket and load port (7), there are two the load port (7) is set.
7. a kind of rebound jetting type deflector electrohydraulic servo valve according to claim 1, which is characterized in that the armature
The rod piece that component (2) is arranged bourdon tube by outside is connect with deflector (3).
8. a kind of rebound jetting type deflector electrohydraulic servo valve according to claim 5, which is characterized in that the semicircle
The radius of cylindrical groove (21) is more than the width of receiving channel (16) and fluidic channel (17) outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810509716.2A CN108547823A (en) | 2018-05-24 | 2018-05-24 | A kind of rebound jetting type deflector electrohydraulic servo valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810509716.2A CN108547823A (en) | 2018-05-24 | 2018-05-24 | A kind of rebound jetting type deflector electrohydraulic servo valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108547823A true CN108547823A (en) | 2018-09-18 |
Family
ID=63495613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810509716.2A Pending CN108547823A (en) | 2018-05-24 | 2018-05-24 | A kind of rebound jetting type deflector electrohydraulic servo valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108547823A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488657A (en) * | 2019-01-07 | 2019-03-19 | 大连理工大学 | A kind of emulation modelling method of jet pipe electrohydraulic servo valve |
| CN113567108A (en) * | 2021-07-09 | 2021-10-29 | 同济大学 | Method for measuring erosion abrasion loss of valve port of slide valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1335870A (en) * | 1969-04-14 | 1971-10-09 | Seeck Industries Limited | Fluid powered actuators for applying torque |
| CN106337851A (en) * | 2016-10-27 | 2017-01-18 | 西安航空制动科技有限公司 | Deflected jet-type brake pressure servo valve |
| CN106640821A (en) * | 2017-02-10 | 2017-05-10 | 同济大学 | Dual-redundancy rebounding jet flow inclined guide plate servo valve |
| CN108035923A (en) * | 2017-11-10 | 2018-05-15 | 中航空工业南京伺服控制系统有限公司 | A kind of dissimilar redundancy electrohydraulic servo valve |
-
2018
- 2018-05-24 CN CN201810509716.2A patent/CN108547823A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1335870A (en) * | 1969-04-14 | 1971-10-09 | Seeck Industries Limited | Fluid powered actuators for applying torque |
| CN106337851A (en) * | 2016-10-27 | 2017-01-18 | 西安航空制动科技有限公司 | Deflected jet-type brake pressure servo valve |
| CN106640821A (en) * | 2017-02-10 | 2017-05-10 | 同济大学 | Dual-redundancy rebounding jet flow inclined guide plate servo valve |
| CN108035923A (en) * | 2017-11-10 | 2018-05-15 | 中航空工业南京伺服控制系统有限公司 | A kind of dissimilar redundancy electrohydraulic servo valve |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488657A (en) * | 2019-01-07 | 2019-03-19 | 大连理工大学 | A kind of emulation modelling method of jet pipe electrohydraulic servo valve |
| CN113567108A (en) * | 2021-07-09 | 2021-10-29 | 同济大学 | Method for measuring erosion abrasion loss of valve port of slide valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108547823A (en) | A kind of rebound jetting type deflector electrohydraulic servo valve | |
| CN100354072C (en) | Control valve in a percussion device and a method comprising a closed pressure space at the end position of the piston | |
| CN102507171B (en) | High-pressure water jet equipment part high-efficiency fatigue test device and test method thereof | |
| CN201497683U (en) | Speed-adjustable ejection device used in crash tests | |
| CN106337851A (en) | Deflected jet-type brake pressure servo valve | |
| CN107906084A (en) | Rock drill and its hydraulic pressure drilling control system | |
| CN113338790A (en) | Reversing valve of hydraulic rock drill | |
| CN106640821B (en) | A kind of dual redundant bounce-back jet stream deflector servo valve | |
| CN108266417A (en) | A kind of high water-based high pressure big flow proportional direction valve | |
| CN102155449A (en) | Digitally controlled leading type proportional flow valve | |
| CN108518370B (en) | A kind of electromagnetic proportional valve of flow saturation resistance | |
| CN108035923A (en) | A kind of dissimilar redundancy electrohydraulic servo valve | |
| CN108708884A (en) | Variable-gain pressure servo valve | |
| CN113236112A (en) | Signal oil output structure of hydraulic rock drill impact cylinder | |
| CN201187585Y (en) | High speed switch valve driven by piezo crystal | |
| CN108533559B (en) | A kind of rebound jetting type deflector electrohydraulic servo valve with hydrostatic support | |
| CN210499555U (en) | Hydraulic feeding type horizontal-axis-distance table surface grinding machine | |
| CN209738222U (en) | Die sinking hydraulic control system of injection molding machine | |
| CN206656062U (en) | A kind of three-way connection in automobile engine | |
| CN207315790U (en) | Rock drill and its hydraulic pressure drilling control system | |
| CN103090019A (en) | Regulating valve of axial flow sleeve | |
| CN103244749B (en) | Pressure reducing valve | |
| CN204878803U (en) | Extra -large -size reservoir atmospheric valve structure | |
| CN201222045Y (en) | Double flux direct-action electromagnetic valve | |
| CN201198568Y (en) | Compound desanding channel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180918 |