CN108316936A - Shield machine fltting speed control device - Google Patents
Shield machine fltting speed control device Download PDFInfo
- Publication number
- CN108316936A CN108316936A CN201810204317.5A CN201810204317A CN108316936A CN 108316936 A CN108316936 A CN 108316936A CN 201810204317 A CN201810204317 A CN 201810204317A CN 108316936 A CN108316936 A CN 108316936A
- Authority
- CN
- China
- Prior art keywords
- plunger
- jack
- flow distributor
- main body
- mandrel
- 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.)
- Granted
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 230000001737 promoting effect Effects 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 12
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
A kind of shield machine fltting speed control device, the device includes controller, three-position four-way valve, flow distributor, two propulsion jack, displacement sensor there are one being respectively mounted on each push rod for promoting jack, displacement sensor is electrically connected with the controller, to which each displacement signal for promoting jack is transferred to controller, flow distributor includes an entrance and two outlets, the entrance of flow distributor is connected with three-position four-way valve actuator port, each of flow distributor exports the rodless cavity for being respectively communicated with a propulsion jack, jack rod chamber is promoted to be connected to another actuator port of three-position four-way valve, flow distributor is monolithic construction.Present invention offer one kind is compact-sized, space is small, flow adjusts accurate shield machine fltting speed control device.
Description
Technical field
The present invention relates to a kind of shield machine fltting speed control device, accurately controlled more particularly to a kind of
Shield machine fltting speed control device.
Background technology
Shield machine propulsion action is realized by multiple hydraulic jacks, is needed to every during hydraulic jack moves ahead
The speed of a hydraulic jack is controlled, with keep the coordination of hydraulic jack with it is synchronous, this is just needed to entering hydraulic pressure thousand
The flow on jin top is controlled.Existing speed control unit is divided on the oil inlet pipe of each hydraulic jack in same group
Not She Zhi a flow regulator, to realize the independent control into oil stream amount to each hydraulic jack, but existing
Speed control unit is due to comprising multiple flow regulators, scattered distribution, and space is larger.And existing flow-rate adjustment
The variation of the aperture of the restriction of device is not linear enough, and flow adjustment is inaccurate.
Invention content
The present invention is to provide a kind of compact-sized, space to avoid above-mentioned existing deficiencies in the technology
Small, flow adjusts accurate shield machine fltting speed control device.
The present invention is to solve technical problem to adopt the following technical scheme that：
A kind of shield machine fltting speed control device, the device include controller, three-position four-way valve, flow distributor, two push away
Into jack, it is respectively mounted on each push rod for promoting jack there are one displacement sensor, displacement sensor is electrically connected with controller
It connects, to promote the displacement signal of jack to be transferred to controller by each, flow distributor includes that an entrance and two go out
Mouthful, the entrance of flow distributor is connected with three-position four-way valve actuator port, and the outlet of each of flow distributor connects respectively
Lead to the rodless cavity of a propulsion jack, jack rod chamber is promoted to be connected to another actuator port of three-position four-way valve, flows
It is monolithic construction to measure distributor.
Further, flow distributor includes main body, and pedestal is provided on the right side of main body, and throttling is provided on pedestal
Mouth is provided with entrance at the intermediate position of pedestal, and the both sides of main body are respectively arranged with first outlet, second outlet, and entrance passes through
Restriction is connected to first outlet, second outlet respectively, and cylindrical cavity is provided in main body, and being provided in cavity can be with
The plunger that main body is slidably matched, is provided with spring cavity on the left of plunger, and a plurality of access is offered on plunger, including：It is intermediate
Access, the first access, alternate path, wherein via intermedia is connected to entrance and spring cavity, and the first access is connected to first outlet and bullet
Spring chamber, alternate path are connected to second outlet and spring cavity, and there are two volume control device, each flow controls for setting on the left of main body
Device processed includes the mandrel for the cylindrical empty intracavitary that the actuator in portion outside the main body is arranged and stretches into main body, wherein the first core
Flow of the axis for controlling the first access, flow of second mandrel for controlling alternate path, the first mandrel and the second mandrel
End is disposed as taper；The right-hand end of plunger is provided with auxiliary section, and the axial cross section of auxiliary section is parabolic shape, on plunger
Auxiliary section and restriction can cooperatively form sealing；Restricting element is provided in via intermedia；It is provided in spring cavity
One end of resetting spring, resetting spring is abutted with main body, and the other end is abutted with plunger.
Further, it is provided with sealing ring at the cooperation of mandrel and main body.
Further, the groove for accommodating the sealing ring is provided in main body.
The speed control unit is under non-working condition, and three-position four-way valve is in middle position, and the plunger of flow distributor is in bullet
Under the action of spring, the auxiliary section on plunger is abutted with restriction always, the mandrel of each volume control device also seal against to
Corresponding tunnel end, flow distributor are closed；When promoting jack to need to push ahead, three-position four-way valve
Oil inlet is connected to an actuator port, another actuator port of three-position four-way valve and the oil return opening of three-position four-way valve connect,
Oil inlet P of the high pressure oil through three-position four-way valve, an actuator port enter the entrance of flow distributor, the pressure gram of hydraulic oil
Spring force is taken, plunger is moved to the left, and each mandrel is in quick condition, can keep abutting and following with plunger moving together with plunger
Dynamic, flow distributor is opened, and with the gradual increase of hydraulic fluid pressure, the aperture between the auxiliary section and restriction of plunger is gradual
Increase, the flow of hydraulic oil linearly increases, at this point, each rate of discharge all same, jack are pushed ahead.
In progradation, the size of fltting speed can in real time be detected by the displacement sensor being arranged on jack promotes position
It moves, and displacement signal is transferred to controller, displacement signal is transferred to control by controller according to the speed of each jack
Device, controller adjust each rate of discharge of flow distributor according to the speed of each jack, by controlling the position of each mandrel, adjust
The flow of its whole respective channels.Such as when controller judges that the speed of the first jack is less than the speed of the second jack, control
First mandrel is detached from plunger, and controls the displacement of the first mandrel so as to adjust the flow of the first access.It is supplemented by the first access
The flow of first outlet, to improve the fltting speed of the first jack, two jack of realization move synchronously.
Beneficial effects of the present invention are as follows：
1. flow distributor is monolithic construction, by the integrally disposed of multiple outlets of import of a flow distributor,
Multiple flow control devices are integrated in a valve body, structure is simplified, reduce space.
2. by the way that multiple communication paths for spring cavity and each outlet are arranged on plunger, and setting is used for accordingly
The flow rate adjusting mechanism for controlling each access, according to each specific flow demand in outlet, by the action of plunger and to each flow
The control of adjustment mechanism mandrel aperture can meet flow needs different in different propulsion jack, reach and be accurately controlled
The requirement of each rate of discharge, to ensure to promote moving synchronously for jack with group.
3. the right-hand end of plunger is provided with auxiliary section, it sets the axial cross section of auxiliary section to parabolic shape, the setting
The linearity that changes in flow rate at restriction can be improved, so as to meet the requirement of the throttling control to rate-of flow.
Description of the drawings
Fig. 1 is the hydraulic principle schematic diagram of the present invention.
Fig. 2 is the flow distributor structural schematic diagram of the present invention.
Reference numeral in figure is respectively：Three-position four-way valve 101, flow distributor 102, first promote jack 1,031 the
Two promote jack 1032, displacement sensor 104, controller 105, main body 1, pedestal 2, restriction 3, entrance 4, first outlet
11, second outlet 21, plunger 5, via intermedia 6, spring cavity 7, the first access 12, alternate path 22, volume control device13、
Volume control device23, the first actuator 14, the first mandrel 15, the second actuator 24, the second mandrel 25, auxiliary section 9, reset
Spring 32, restricting element 33.
Specific implementation mode
The present invention will be further described below with reference to the drawings.
Referring to attached drawing 1 and attached drawing 2.
A kind of shield machine fltting speed control device, the device include controller 105, three-position four-way valve 101, assignment of traffic
102, two propulsion jack of device each promote displacement sensor 104 there are one being respectively mounted on the push rod of jack, displacement sensing
Device 104 is electrically connected with controller 105, to which each displacement signal for promoting jack is transferred to controller, flow distributor
102 include that an entrance and two export, the entrance of flow distributor 102 and an actuator port phase of three-position four-way valve 101
Even, each of flow distributor 102 exports the rodless cavity for being respectively communicated with a propulsion jack, promotes jack rod chamber and three
Another actuator port of position four-way valve is connected to, and flow distributor is monolithic construction.
Flow distributor 102 includes main body 1, and the right side of main body 1 is provided with pedestal 2, restriction is provided on pedestal 2
3, the intermediate position of pedestal 2 is provided with entrance 4, the both sides of main body 1 are respectively arranged with first outlet 11, second outlet 21, stream
The first outlet 11 for measuring distributor 102 is connected to the rodless cavity of the first propulsion jack 1031, and the second of flow distributor 102 goes out
Mouth 21 is connected to the rodless cavity of the second propulsion jack 1032, and entrance 4 is gone out with first outlet 11, second respectively by restriction 3
Mouth 21 is connected to, and is provided with cylindrical cavity in main body 1, the plunger 5 that can be slidably matched with main body 1 is provided in cavity,
The left side of plunger 5 is provided with spring cavity 7, and a plurality of access is offered on plunger 5, including：Via intermedia 6, the first access 12,
Two accesses 22, wherein via intermedia 6 is connected to entrance 4 and spring cavity 7, and the first access 12 is connected to first outlet 11 and spring cavity 7,
Alternate path 22 is connected to second outlet 21 and spring cavity 7, and in 1 left side setting of main body, there are two volume control device, each flows
Control device includes the mandrel of the actuator being arranged outside main body 1 and the cylindrical empty intracavitary for stretching into main body 1, wherein the
One mandrel 15 is used to control the flow of the first access 12, and the second mandrel 25 is used to control the flow of alternate path 22, the first mandrel
15 and second the end of mandrel 25 be disposed as taper；The right-hand end of plunger 5 is provided with auxiliary section 9, and the axial direction of auxiliary section is cut
Face is parabolic shape, and the auxiliary section 9 and restriction 3 on plunger 5 can cooperatively form sealing；Section is provided in via intermedia 6
Fluid element 33；Resetting spring 32 is provided in spring cavity 7, one end of resetting spring 32 is abutted with main body 1, the other end and plunger
5 abut.
In order to avoid being revealed between mandrel 15,25 and main body 1, sealing is provided at the cooperation of mandrel and main body 1
Circle（It is not shown）, sealing ring can be set to the combination of multiple sealing rings, and be provided with accommodate the recessed of sealing ring on the body 1
Slot.
Under non-working condition, three-position four-way valve 101 is in middle position, the effect of the plunger 5 of flow distributor 102 in spring 32
Under, the auxiliary section 9 on plunger 5 is abutted with restriction 3 always, and the mandrel of each volume control device is also sealed against to corresponding
Tunnel end, flow distributor 102 are closed；When promoting jack 103 to need to push ahead, three-position four-way valve
101 oil inlet P is connected to actuator port A, and the actuator port B of three-position four-way valve 101 and the oil return inlet T of three-position four-way valve connect
It connects, oil inlet P of the high pressure oil through three-position four-way valve 101, actuator port A enter the entrance 4 of flow distributor 102, hydraulic oil
Pressure overcomes spring force, plunger 5 to be moved to the left, and each mandrel is in quick condition, can keep abutting with plunger and follow plunger 5
Move together, flow distributor 102 is opened, with the gradual increase of hydraulic fluid pressure, the auxiliary section 9 and restriction 3 of plunger 5 it
Between aperture gradually increase, the flow of hydraulic oil linearly increases, at this point, each rate of discharge all same, jack 103 is to being pushed forward
Into.
In progradation, the size of fltting speed can in real time be detected by the displacement sensor 104 being arranged on jack 103 to be pushed away
It is transferred to controller 105 into displacement, and by displacement signal, controller 105 is according to the speed of each jack 103, controller 105
It is transferred to controller 105 according to the speed of each jack, and by displacement signal, controller 105 is according to the speed of each jack
Degree adjustment each rate of discharge of flow distributor adjusts the flow of its respective channels by controlling the position of each mandrel.Such as work as control
When device 105 judges that the speed of the first jack 1031 is less than the speed of the second jack 1032, the first mandrel 15 of control is detached from column
Plug 5, and the displacement of the first mandrel 15 is controlled so as to adjust the flow of the first access 12.First outlet is supplemented by the first access 12
11 flow, to improve the fltting speed of the first jack 1031, two jack of realization move synchronously.
The above is only the better embodiment of the present invention, therefore all constructions according to described in present patent application range,
The equivalent change or modification that feature and principle are done, is included within the scope of present patent application.
Claims (5)
1. a kind of shield machine fltting speed control device, the device include controller, three-position four-way valve, flow distributor, two
Jack is promoted, displacement sensor there are one being respectively mounted on the push rod of jack, displacement sensor and controller electricity are each promoted
Connection, flow distributor include that an entrance and two export, the entrance of flow distributor and the actuator port A of three-position four-way valve
It is connected, each of flow distributor exports the rodless cavity for being respectively communicated with a propulsion jack, promotes jack rod chamber and three
The actuator port B connections of position four-way valve, flow distributor is monolithic construction.
2. a kind of shield machine fltting speed control device as described in claim 1, wherein the flow distributor includes main body,
It is provided with pedestal on the right side of main body, restriction is provided on pedestal, the intermediate position of pedestal is provided with entrance, main body
Both sides are respectively arranged with first outlet, second outlet, and entrance is connected to first outlet, second outlet respectively by restriction,
It is provided with cylindrical cavity in main body, the plunger that can be slidably matched with main body is provided in cavity, is arranged in the left side of plunger
There is spring cavity, a plurality of access is offered on plunger, including：Via intermedia, the first access, alternate path, wherein via intermedia
It is connected to entrance and spring cavity, the first access is connected to first outlet and spring cavity, and alternate path is connected to second outlet and spring cavity,
Setting is there are two volume control device on the left of main body, each volume control device include setting outside the main body the actuator in portion and
Stretch into the mandrel of the cylindrical empty intracavitary of main body, wherein the first mandrel is used to control the flow of the first access, and the second mandrel is used for
The end of the flow of control alternate path, the first mandrel and the second mandrel is disposed as taper；The right-hand end of plunger is provided with
The axial cross section of auxiliary section, auxiliary section is parabolic shape, and the auxiliary section and restriction on plunger can cooperatively form sealing；In
Between be provided with restricting element in access；Resetting spring is provided in spring cavity, one end of resetting spring is abutted with main body, another
End is abutted with plunger.
3. a kind of shield machine fltting speed control device as described in claim 1, is provided at the cooperation of mandrel and main body
Sealing ring.
4. a kind of shield machine fltting speed control device as claimed in claim 3, be provided in the main body accommodate it is described close
The groove of seal.
5. a kind of application process including shield machine fltting speed control device as claimed in claim 3, which is characterized in that should
For speed control unit under non-working condition, three-position four-way valve is in middle position, the plunger of flow distributor under the action of the spring,
Auxiliary section on plunger is abutted with restriction always, and the mandrel of each volume control device is also sealed against to corresponding path terminal
Portion, flow distributor are closed；When promoting jack to need to push ahead, oil inlet of the high pressure oil through three-position four-way valve
Mouth P, actuator port A enter the entrance of flow distributor, and the pressure of hydraulic oil overcomes spring force, plunger to be moved to the left, each mandrel
In quick condition, it can keep abutting with plunger and plunger is followed to move together, flow distributor is opened, with hydraulic oil pressure
The gradual increase of power, the aperture between the auxiliary section and restriction of plunger gradually increase, and the flow of hydraulic oil linearly increases, this
When, each rate of discharge all same, jack is pushed ahead；In progradation, the size of fltting speed can be by being arranged on jack
Displacement sensor detect forward displacement in real time, and displacement signal is transferred to controller, controller is according to each jack
Speed adjusts each rate of discharge of flow distributor, by controlling the position of each mandrel, adjusts the flow of its respective channels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810204317.5A CN108316936B (en) | 2018-03-13 | 2018-03-13 | Shield machine propulsion speed control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810204317.5A CN108316936B (en) | 2018-03-13 | 2018-03-13 | Shield machine propulsion speed control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108316936A true CN108316936A (en) | 2018-07-24 |
| CN108316936B CN108316936B (en) | 2019-06-25 |
Family
ID=62902028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810204317.5A Active CN108316936B (en) | 2018-03-13 | 2018-03-13 | Shield machine propulsion speed control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108316936B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09303078A (en) * | 1996-05-20 | 1997-11-25 | Hitachi Constr Mach Co Ltd | Breaking control device for broken type shield excavator |
| JP2001152781A (en) * | 1999-11-25 | 2001-06-05 | Hitachi Constr Mach Co Ltd | Apparatus and method for controlling shield machine |
| CN1560482A (en) * | 2004-03-12 | 2005-01-05 | 浙江大学 | Hydraulic propelling system for mining tunnel driving machine controlled by ratio flow pressure |
| JP2008045385A (en) * | 2006-08-21 | 2008-02-28 | Sanwa Kizai Co Ltd | Water-pressure feeder to water-pressure cylinder for compensation for buried-pipe propulsive-direction compensator |
| CN101575978A (en) * | 2009-06-01 | 2009-11-11 | 浙江大学 | Pressure-speed mixed control shield propulsion hydraulic system |
| CN201539262U (en) * | 2009-11-02 | 2010-08-04 | 一重集团大连设计研究院有限公司 | Hydraulic control loop of advancing cylinder for shield machine |
| CN102278124A (en) * | 2011-06-24 | 2011-12-14 | 北京市三一重机有限公司 | Energy-saving hydraulic shield propulsion system |
| CN102900715A (en) * | 2012-10-08 | 2013-01-30 | 北京索普液压机电有限公司 | Hydraulic control system for forklift, and forklift |
| CN203879512U (en) * | 2014-04-28 | 2014-10-15 | 北京市三一重机有限公司 | Open shield tunneling machine, supporting device and supporting device control system |
| CN106194868A (en) * | 2016-08-24 | 2016-12-07 | 苏州苏铸成套装备制造有限公司 | Case control structure is lifted in the synchronization of a kind of flask separator |
| CN206206301U (en) * | 2016-08-24 | 2017-05-31 | 中铁隧道股份有限公司 | A kind of shield/TBM quickly misses the stop the hydraulic control circuit of stepping platform |
-
2018
- 2018-03-13 CN CN201810204317.5A patent/CN108316936B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09303078A (en) * | 1996-05-20 | 1997-11-25 | Hitachi Constr Mach Co Ltd | Breaking control device for broken type shield excavator |
| JP2001152781A (en) * | 1999-11-25 | 2001-06-05 | Hitachi Constr Mach Co Ltd | Apparatus and method for controlling shield machine |
| CN1560482A (en) * | 2004-03-12 | 2005-01-05 | 浙江大学 | Hydraulic propelling system for mining tunnel driving machine controlled by ratio flow pressure |
| JP2008045385A (en) * | 2006-08-21 | 2008-02-28 | Sanwa Kizai Co Ltd | Water-pressure feeder to water-pressure cylinder for compensation for buried-pipe propulsive-direction compensator |
| CN101575978A (en) * | 2009-06-01 | 2009-11-11 | 浙江大学 | Pressure-speed mixed control shield propulsion hydraulic system |
| CN201539262U (en) * | 2009-11-02 | 2010-08-04 | 一重集团大连设计研究院有限公司 | Hydraulic control loop of advancing cylinder for shield machine |
| CN102278124A (en) * | 2011-06-24 | 2011-12-14 | 北京市三一重机有限公司 | Energy-saving hydraulic shield propulsion system |
| CN102900715A (en) * | 2012-10-08 | 2013-01-30 | 北京索普液压机电有限公司 | Hydraulic control system for forklift, and forklift |
| CN203879512U (en) * | 2014-04-28 | 2014-10-15 | 北京市三一重机有限公司 | Open shield tunneling machine, supporting device and supporting device control system |
| CN106194868A (en) * | 2016-08-24 | 2016-12-07 | 苏州苏铸成套装备制造有限公司 | Case control structure is lifted in the synchronization of a kind of flask separator |
| CN206206301U (en) * | 2016-08-24 | 2017-05-31 | 中铁隧道股份有限公司 | A kind of shield/TBM quickly misses the stop the hydraulic control circuit of stepping platform |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108316936B (en) | 2019-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201255257Y (en) | Power constant control valve | |
| CN105545852B (en) | High-speed switch pilot proportioning valve | |
| CN104989692B (en) | Compound control-type variable pump and control method thereof | |
| CN108316936A (en) | Shield machine fltting speed control device | |
| CN204717081U (en) | Adjustable flow type dynamic balance valve | |
| CN202187970U (en) | Proportional control multi-way valve for integration of load sensing shunting and converging system and integrally cast runner | |
| CN108412511B (en) | A kind of linear controller for shield machine | |
| CN203532367U (en) | Multi-gear power control variable displacement piston pump | |
| CN103201547A (en) | A new mechanism for fluid power transmission and control | |
| CN102913438B (en) | Hydraulic pump changeover valve | |
| CN103267012A (en) | Flow adjusting device capable of changing plunger volume | |
| JP6106292B2 (en) | Pressure compensation valve | |
| CN201027637Y (en) | Flux-sensitive control valve system used for load-sensitive hydraulic pump | |
| CN208185105U (en) | A kind of multiple directional control valve | |
| US4811607A (en) | Flow sensor | |
| CN110332171A (en) | A kind of double speed valve and dual-speed hydraulic system | |
| CN205064968U (en) | Switch valve with flow regulation function | |
| US20120006427A1 (en) | Hydraulic Valve Device | |
| CN105090149B (en) | Positive-feedback electro-hydraulic high-speed two-way switching valve | |
| CN103511369A (en) | Multi-gear power control variable piston pump | |
| CN109899161B (en) | Liquid fuel metering device | |
| CN103453192B (en) | Level pressure totally enclosed type pressure-reducing valve | |
| CN108412510B (en) | Speed composite regulation and control device for shield machine | |
| CN108266416B (en) | A kind of flow divider valve for double pump system | |
| CN106024511A (en) | Adjustable pressure relay |
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 | ||
| CB02 | Change of applicant information |
Address after: 510000 Guangzhou Nansha District, Guangdong Province, Mingzhuwan Starting Area, West Side of Industrial Fourth Road, self-compiled No. 2 (for office use only) (self-declaration) (MZ) Applicant after: China Railway Tunnel Bureau Group Co Ltd Applicant after: STATE KEY LABORATORY OF SHIELD MACHINE AND BORING TECHNOLOGY Address before: 471000 Luoyang, Henan, the old city of Zhuang Yuan Red Road Applicant before: China Railway Tunnel Bureau Group Co Ltd Applicant before: STATE KEY LABORATORY OF SHIELD MACHINE AND BORING TECHNOLOGY |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |