CN107725505A - Hydraulic system with different accessory flow regulating functions - Google Patents
Hydraulic system with different accessory flow regulating functions Download PDFInfo
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- CN107725505A CN107725505A CN201710873162.XA CN201710873162A CN107725505A CN 107725505 A CN107725505 A CN 107725505A CN 201710873162 A CN201710873162 A CN 201710873162A CN 107725505 A CN107725505 A CN 107725505A
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- Prior art keywords
- valve
- accessory
- pilot
- control
- load
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/255—Flow control functions
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40523—Flow control characterised by the type of flow control means or valve with flow dividers
- F15B2211/4053—Flow control characterised by the type of flow control means or valve with flow dividers using valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to hydraulic system, to solve the problems, such as that existing hydraulic system is adapted to very well with each flow difference accessory；Hydraulic system, including accessory hydraulic actuator, accessory control valve, plunger pump, accessory manipulation device, pilot control are provided；The load feedback oil circuit connection of plunger pump is connected with the left end of the load-sensitive valve；Controller and accessory manipulation device the linkage conducting that electric proportional pressure-reducing valve, output end are connected with the automatically controlled end of electric proportional pressure-reducing valve and the switch valve closed；The output end of electric proportional pressure-reducing valve and the load-sensitive valve right-hand member of plunger pump are connected, and the input of electric proportional pressure-reducing valve is connected through switch valve with pilot control.The present invention has corresponding different accessories, adjustable in flow, reduces energy loss, simple and convenient, person's operation easy to operation, improves operating efficiency, the discharge capacity of pump is reduced according to the accessory under different operating modes, the advantages that reducing energy consumption.
Description
Technical field
The present invention relates to a kind of hydraulic system, more specifically to a kind of with different accessory flow regulating functions
Hydraulic system.
Background technology
Engineering machinery is the different working condition of adaptation at present, is equipped with different accessories, and with the development of accessory, it is different
Flow, pressure and fluid flow direction required for the accessory of function are all each discrepant.
By taking excavator as an example, general excavator in order to adapt to different accessories, using the excavator of different tonnages come
With different accessories, in order to realize that the accessory of a range of different operating flow can be applied on same portion's excavator, greatly
Part main engine plants employ the method for compromise flow.Worked using maximum with the average value of minimum working flow to design accessory
Flow, part main engine plants, which employ, meets accessory maximum stream flow to design, and so in use, the comfortableness of operation is not
It is fine.For load sensitive system, a few hosts factory employs the method for limitation main valve movement travel, to realize different accessories
Flow restriction.It is the work operating mode for realizing different accessories for the existing excavator of load sensitive system, employs limitation master
The method of valve movement travel, come realize different accessories flow restriction.The size of flow is controlled in handoff procedure by valve, is saved
Stream loss is big, and due to limiting the displacement of valve element, the effective travel of valve is reduced, and control accuracy declines, the fine motion for the accessory that works
Property is bad.
The content of the invention
The technical problem to be solved in the present invention is to be asked for existing hydraulic system with what each flow difference accessory was adapted to very well
Topic, and provide it is a kind of with different accessory flow regulating functions with meet different flow accessory adaptation hydraulic system.
The present invention is such to realize the technical scheme of its purpose：There is provided one kind has different accessory flow regulating functions
Hydraulic system, including accessory hydraulic actuator, the accessory control valve, pumping hole and the accessory that are connected with accessory hydraulic actuator
The plunger pump of control valve work oil inlet connection, accessory manipulation device, the pilot control being connected with accessory control valve；The plunger
Load-sensitive valve is included in pump；It is characterized in that connect including electric proportional pressure-reducing valve, output end and the automatically controlled end of electric proportional pressure-reducing valve
Controller, the switch valve with accessory manipulation device linkage conducting and closing connect；The output end and post of the electric proportional pressure-reducing valve
The load-sensitive valve right-hand member connection of pump is filled in, the input of electric proportional pressure-reducing valve is connected through switch valve with pilot control.In the present invention
In, flow of the operating personnel according to required for accessory, on the controller set corresponding to output current, when accessory manipulation device have
When having the action for manipulating accessory work, controller exports corresponding electric current, electric proportional pressure-reducing valve by the pressure of pilot control press than
Pressure signal is transported to the control terminal of the load-sensitive valve of plunger pump after example decompression, the pressure of electric proportional pressure-reducing valve output, born
Carry the pressure that is collected from pumping hole of sensitive valve, pressure that spring, the load feedback oil circuit of load-sensitive valve end collect it is common
Act on the valve element of load-sensitive valve, control the discharge capacity of plunger pump together so that required for the discharge capacity and accessory of plunger pump
Flow is adapted.During the different accessory of connection traffic, controller exports different electric currents so that the discharge capacity of plunger pump and accessory institute
The flow needed is adapted.
In above-mentioned hydraulic system, the load feedback oil circuit of the plunger pump and the spring terminal of the load-sensitive valve are (i.e. left
End) connect, the opposite end (i.e. right-hand member) of the output end of the electric proportional pressure-reducing valve and the load-sensitive valve spring terminal of plunger pump is even
Connect.Realize that main pump output flow exports with electric proportional pressure-reducing valve in the case where engine speed is certain, main control valve opening is certain
Pressure increase and reduce.The degree that main pump flow reduces is directly proportional to the pressure that electric proportional pressure-reducing valve exports.Or the post
The spring terminal of the load feedback oil circuit of plug pump and the output end of the electric proportional pressure-reducing valve with the load-sensitive valve is connected.It is real
In the case that present engine speed is certain, main control valve opening is certain, pressure that main pump output flow exports with electric proportional pressure-reducing valve
Power increases and increased.The increased degree of main pump flow is directly proportional to the pressure that electric proportional pressure-reducing valve exports.
The accessory manipulation device and pilot valve, the two-way guide output end of the pilot valve correspond to and accessory control valve
Both ends are connected, and the oil inlet end of pilot valve is connected with pilot control.The switch valve is two-bit triplet pilot operated valve device, its first hydraulic fluid port with
The oil inlet connection of electric proportional pressure-reducing valve, the second hydraulic fluid port are connected with pilot control, and the 3rd hydraulic fluid port is connected with fuel tank loop, described to open
Close the hydraulic control end of valve and the oil-out of shuttle valve connects, two oil inlet ends of shuttle valve correspond to guide's output end company of the pilot valve
Connect, the first hydraulic fluid port turns on the second hydraulic fluid port when guide's output end of the pilot valve has effective pilot pressure output, the elder generation
Guide's output end of pilot valve does not have the first hydraulic fluid port during effective pilot pressure output to be turned on the 3rd hydraulic fluid port.
In above-mentioned hydraulic system, the switch valve can also be magnetic valve, and the Electromagnetic Control end of magnetic valve can be with control
Device connects, and is controlled by controller, or by accessory manipulation device is linked or be directly connected to realize coordinated signals.Filled when accessory manipulates
It is equipped with when manipulating the action of accessory and occurring, controller output power turns on switch valve, makes the pressure transmission of pilot control to electric
The oil inlet of proportional pressure-reducing valve, when accessory manipulation device is without the action for manipulating accessory, switch valve cut-off.
In the present invention, accessory manipulation device can also be the electronics control of electric control handle etc in addition to being pilot valve
Device processed, correspondingly, accessory control valve are magnetic valve, and the output end of accessory manipulation device is connected to accessory control valve
Electromagnetic Control end, the commutation of accessory control valve is controlled, realize the action control of accessory.
The present invention compared with prior art, has advantages below：
1. corresponding different accessories, adjustable in flow, energy loss is reduced.
2. it is simple and convenient, person's operation easy to operation, improve operating efficiency.
3. reducing the discharge capacity of pump according to the accessory under different operating modes, energy consumption is reduced.
Brief description of the drawings
Fig. 1 is the schematic diagram of hydraulic system in the embodiment of the present invention one.
Parts title and sequence number in figure：
Engine 1, hydraulic oil container 2, plunger pump 31, pioneer pump 32, banked direction control valves 4, accessory oil cylinder 5, shuttle valve 6, pilot valve 7,
Control valve group 8, switch valve 81, electric proportional pressure-reducing valve 82, controller 9.
Embodiment
Illustrate specific embodiment below in conjunction with the accompanying drawings.
Hydraulic system in the present embodiment is as shown in figure 1, it includes accessory hydraulic actuator, control valve group 8, multichannel
Valve, plunger pump 31, pilot valve 7, pioneer pump 32, controller 9.
Accessory hydraulic actuator can be accessory oil cylinder 5 or hydraulic motor and other use hydraulic energy conduct
The device of drive energy.
There are more linkage control valves, for controlling different hydraulic actuators, wherein just including being used to control in banked direction control valves
The hydraulic control accessory control valve 4 of accessory.
Load-sensitive valve, the load feedback oil circuit PL interfaces connection of plunger pump 31 and load-sensitive valve are included in plunger pump 31
Left end, the oil inlet of the pumping hole of plunger pump 31 and banked direction control valves connects, supplied to each control valve including accessory control valve 4
Oil.
The two-way guide output end of pilot valve 7 is connected with the hydraulic control end at accessory control valve 4D both ends, control accessory control valve 4
Commutation, realize the manipulation of accessory.
Pioneer pump 32 is used as pilot control, is driven together with plunger pump 31 by engine 1, and the liquid draw from hydraulic oil container
Force feed, the pumping hole of pioneer pump 32 are connected with guide's oil inlet of pilot valve 7.
Control valve group 8 includes switch valve 81, electric proportional pressure-reducing valve 82.The output end and load-sensitive of electric proportional pressure-reducing valve 82
The right-hand member connection of valve, the Electromagnetic Control end C of electric proportional pressure-reducing valve 82 are connected with controller 9.
Switch valve 81 is two-bit triplet pilot operated valve device, and its hydraulic control end O is connected with the oil outlet end C of shuttle valve 6, and two of shuttle valve 6 enter
Oily end a, b are connected with two guide's output ends of pilot valve 7 respectively.First hydraulic fluid port of switch valve 81 and the oil-feed of electric proportional pressure-reducing valve
The pumping hole of mouth connection, the second hydraulic fluid port and guide are connected, and the 3rd hydraulic fluid port is connected with fuel tank loop, and guide's output end of pilot valve has
During effective pilot pressure output, it is in upper, and the first hydraulic fluid port turns on the second hydraulic fluid port；Guide's output end of pilot valve does not have
When imitating pilot pressure output, it is in bottom, and the first hydraulic fluid port turns on the 3rd hydraulic fluid port.
In plunger pump 31, the right-hand member of load-sensitive valve has two oil pockets, wherein crossing the pumping hole of an oil pocket and plunger pump
Connection, another oil pocket are connected with the output terminals A hydraulic fluid port of electric proportional pressure-reducing valve 82.The pressure and plunger of electric ratio output end output
For the pump intake pressure collective effect of pump in the right-hand member of load-sensitive valve, the left end of load-sensitive valve has the elastic force of spring and load anti-
The pressure of feedback, load-sensitive valve both ends are finally reached balance, are achieved in the discharge capacity of plunger pump.
Hydraulic system in the present embodiment, corresponding different operating mode, operator is in the case of selected pattern, operated pilot
Valve 7, plunger pump 31 produce different discharge capacities to meet the working condition requirement of corresponding accessory, are not required to using in control banked direction control valves
The pilot pressure at the both ends of accessory control valve both ends 4, the amount of opening of the valve element of accessory control valve is set to reduce to control accessory oil cylinder 5
Working condition requirement, implements operation principle：
When excavator corresponds to different working conditions, requirement of the corresponding accessory to flow and pressure rating is different, when
When accessory oil cylinder 5 needs the low discharge to be operated, pilot valve 7 produces pressure signal and carries out feeding back to control valve group 8 by shuttle valve 6
In switch valve 81 on function position end (O ends), pressure makes switch in the presence of the spring force of 81 times function positions of switch valve is overcome
Valve 81 realizes commutation, and the fluid of pioneer pump 32 flows to the input of electric proportional pressure-reducing valve 82 by switch valve 81, after decompression
Right-hand member by pressure signal transmission to the load-sensitive valve of plunger pump 31 so that the valve element of load-sensitive valve moves to left, so as to reach
Reduce the purpose of pumpage.In the process, operator is according to the attribute of accessory, electric current corresponding to output, depressurizes electric ratio
Valve works in corresponding valve port position.In the case where the rotating speed of engine 1 is certain, the reduction of the discharge capacity of plunger pump 31, it is meant that be
The reduction of system flow, that is, the flow for passing through accessory control valve 4 reduce.Until load-sensitive valve reaches a new balance.Load
The spring force of sensitive valve left end+load feedback pressure act on left end on load-sensitive valve make a concerted effort and outlet of plunger pump pressure electricity
The output pressure of proportional pressure-reducing valve 82 act on right-hand member on load-sensitive valve make a concerted effort reach poised state.
The output pressure size of electric proportional pressure-reducing valve 82 determines the reduction degree of the discharge capacity of plunger pump 31, and the pressure of output is got over
Height, the discharge capacity of plunger pump 31 will reduce to smaller, and the output pressure size of electric proportional pressure-reducing valve 82 inputs to control by controller 9
The size of current that 8 mouthfuls of valve group determines.The output current of controller 9, the speed for wanting to realize according to accessory oil cylinder 5 by operator provide
Setting.It is required that speed it is slower, then controller 9 export electric current it is bigger, now the discharge capacity of plunger pump 31 will be smaller.Thus
Realizing accessory oil cylinder 5 has slower speed.
When needing other connection work of banked direction control valves 4 (accessory difference exists), the attonity of pilot valve 7, i.e., pressure signal is not produced,
The no pressure signal output of shuttle valve 6, pilot operated directional control valve 81 returns to function in the presence of the spring force of lower function position in control valve group 8
Position, the pressure oil at upper function position end flow back to fuel tank by shuttle valve 6 by the O mouths of control valve group 8 by the oil return runner of pilot valve 7.
I.e. control valve group 8 is closed, and the load-sensitive valve in other corresponding working conditions in plunger pump 31 is returned to initial state.I.e.
When operating other, plunger pumpage is unaffected, and when only operating accessory oil cylinder 5, flow just can export me according to design load
Desired flow.
The flow for needing difference to go out when selecting different accessories, the size of flow are derived from the telecommunications that controller 9 provides
Number, by the electric signal electric current different to proportional pressure-reducing valve 82, set different patterns to correspond to different electric currents in controller 9
Size, so different electric signals will be corresponded to when selecting different mode, so as to which electric proportional pressure-reducing valve 82 exports different pressures
Power, pump corresponds to different discharge capacities during so as to realize different mode.
In the present embodiment, switch valve is pilot operated directional control valve, and its effect is when pilot valve has motion action, by pioneer pump
Pressure transmission to the input of electric proportional pressure-reducing valve, to realize the function, switch valve can also be magnetic valve, magnetic valve and elder generation
Pilot valve links, and can be connected with controller, directly be controlled by controller, or directly directly controlled by pilot valve.
In the present embodiment, accessory control valve is the pilot operated valve device controlled by pilot valve, in the specific implementation, accessory control valve
Can also be solenoid directional control valve, accessory manipulation device is accordingly changed into the electric control handle of electric handle etc, electric control handle and category
Has the Electromagnetic Control end connection at control valve both ends, the accessory control action electric signal of electric control handle output is accordingly derived for
Control is all the switch valve of magnetic valve, and electric proportional pressure-reducing valve is transferred to during data manipulation action to realize pilot pressure having
Input.
In the present embodiment, the output end of the load feedback oil circuit of plunger pump and electric proportional pressure-reducing valve is and load-sensitive valve
Spring terminal connection.Namely the left end of load-sensitive valve has two oil pockets, spring and the oil pocket are set wherein crossing in an oil pocket
It is connected with the load feedback oil circuit of plunger pump, another oil pocket is connected with the output terminals A hydraulic fluid port of electric proportional pressure-reducing valve.Electric ratio is defeated
Go out to hold the pressure and spring force collective effect that the load feedback oil circuit of the pressure exported and plunger pump collects in load-sensitive
The left end of valve, the left end of load-sensitive valve have the elastic force of spring and the pressure of load feedback and the pressure of electric ratio output end output
Power, the pump intake pressure of the load-sensitive valve collected with the right-hand member of load-sensitive valve offset, and load-sensitive valve both ends finally reach
To balance, the discharge capacity regulation and control of plunger pump are achieved in.
Hydraulic system in the present embodiment compared with prior art, has advantages below：
1. corresponding different accessories, adjustable in flow, energy loss is reduced；
2. pressure-reducing valve and reversal valve integrate, compact-sized, it is easy to not know pipeline；
3. combination of electric and hydraulic, control is reliable and stable；
4. it is simple and convenient, person's operation easy to operation, improve operating efficiency.
5. reducing the discharge capacity of pump according to the accessory under different operating modes, energy consumption is reduced.
Claims (7)
1. a kind of hydraulic system with different accessory flow regulating functions, including accessory hydraulic actuator and accessory hydraulic pressure
The plunger pump and accessory control valve that accessory control valve, pumping hole and the accessory control valve work oil inlet of executive component connection connect
Accessory manipulation device, the pilot control of connection；Load-sensitive valve is included in the plunger pump；It is characterized in that subtract including electric ratio
Controller and accessory manipulation device linkage conducting and the closing that pressure valve, output end are connected with the automatically controlled end of electric proportional pressure-reducing valve
Switch valve；The output end of the electric proportional pressure-reducing valve and the control terminal of the load-sensitive valve of plunger pump connect, electric proportional pressure-reducing valve
Input be connected through switch valve with pilot control.
2. the hydraulic system according to claim 1 with different accessory flow regulating functions, it is characterised in that the post
The load feedback oil circuit of plug pump is connected with the spring terminal of the load-sensitive valve, the output end and plunger of the electric proportional pressure-reducing valve
The opposite end connection of the load-sensitive valve spring terminal of pump.
3. the hydraulic system according to claim 1 with different accessory flow regulating functions, it is characterised in that the post
The spring terminal of the load feedback oil circuit of plug pump and the output end of the electric proportional pressure-reducing valve with the load-sensitive valve is connected.
4. the hydraulic system according to any one of claim 1 to 3 with different accessory flow regulating functions, its feature
It is pilot valve to be the accessory manipulation device, and the two-way guide output end of the pilot valve corresponds to the both ends with accessory control valve
Connection, the oil inlet end of pilot valve are connected with pilot control.
5. the hydraulic system according to claim 4 with different accessory flow regulating functions, it is characterised in that described to open
Pass valve is two-bit triplet pilot operated valve device, and its first hydraulic fluid port is connected with the oil inlet of electric proportional pressure-reducing valve, the second hydraulic fluid port and pilot control
Connection, the 3rd hydraulic fluid port are connected with fuel tank loop, and the hydraulic control end of the switch valve and the oil-out of shuttle valve connect, and two of shuttle valve enter
Guide's output end that oily end corresponds to the pilot valve connects, and guide's output end of the pilot valve has effective pilot pressure defeated
The first hydraulic fluid port turns on the second hydraulic fluid port when going out, the first oil when guide's output end of the pilot valve does not have effective pilot pressure to export
Mouth turns on the 3rd hydraulic fluid port.
6. the hydraulic system according to claim 3 with different accessory flow regulating functions, it is characterised in that described to open
Pass valve is magnetic valve.
7. the hydraulic system according to claim 1 with different accessory flow regulating functions, it is characterised in that the control
Device processed exports control electric current corresponding with accessory flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710873162.XA CN107725505A (en) | 2017-09-25 | 2017-09-25 | Hydraulic system with different accessory flow regulating functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710873162.XA CN107725505A (en) | 2017-09-25 | 2017-09-25 | Hydraulic system with different accessory flow regulating functions |
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| Publication Number | Publication Date |
|---|---|
| CN107725505A true CN107725505A (en) | 2018-02-23 |
Family
ID=61207932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710873162.XA Pending CN107725505A (en) | 2017-09-25 | 2017-09-25 | Hydraulic system with different accessory flow regulating functions |
Country Status (1)
| Country | Link |
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| CN (1) | CN107725505A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108302073A (en) * | 2018-03-26 | 2018-07-20 | 徐工集团工程机械有限公司 | A kind of automobile-used impeller rotating hydraulic system of sand throwing fire extinguishing |
| CN110359511A (en) * | 2018-03-26 | 2019-10-22 | 株式会社日立建机Tierra | Engineering machinery |
| CN111425470A (en) * | 2020-04-14 | 2020-07-17 | 广西玉柴重工有限公司 | Dual-mode flow control device of hydraulic system |
| CN112012972A (en) * | 2020-08-26 | 2020-12-01 | 徐州徐工矿业机械有限公司 | Pilot control oil way and control method for super-tonnage excavator |
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| JPH01267326A (en) * | 1988-04-18 | 1989-10-25 | Hitachi Constr Mach Co Ltd | Engine controller for civil engineering and construction machinery |
| JPH04362286A (en) * | 1991-06-07 | 1992-12-15 | Shin Caterpillar Mitsubishi Ltd | Controller for variable capacity pump |
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| CN201971557U (en) * | 2011-01-27 | 2011-09-14 | 天津山河装备开发有限公司 | Crawler type crane load sensing double power controlling device |
| CN203427615U (en) * | 2013-07-22 | 2014-02-12 | 四川泛水基电液机械有限责任公司 | Open type walking system |
| CN103727082A (en) * | 2013-12-27 | 2014-04-16 | 三一汽车起重机械有限公司 | Hydraulic system and engineering machine |
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| JPH01267326A (en) * | 1988-04-18 | 1989-10-25 | Hitachi Constr Mach Co Ltd | Engine controller for civil engineering and construction machinery |
| JPH04362286A (en) * | 1991-06-07 | 1992-12-15 | Shin Caterpillar Mitsubishi Ltd | Controller for variable capacity pump |
| CN1353794A (en) * | 2000-03-31 | 2002-06-12 | 新履带牵引车三菱有限公司 | Pump control method and pump control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108302073A (en) * | 2018-03-26 | 2018-07-20 | 徐工集团工程机械有限公司 | A kind of automobile-used impeller rotating hydraulic system of sand throwing fire extinguishing |
| CN110359511A (en) * | 2018-03-26 | 2019-10-22 | 株式会社日立建机Tierra | Engineering machinery |
| CN110359511B (en) * | 2018-03-26 | 2021-06-18 | 株式会社日立建机Tierra | Construction machine |
| CN111425470A (en) * | 2020-04-14 | 2020-07-17 | 广西玉柴重工有限公司 | Dual-mode flow control device of hydraulic system |
| CN112012972A (en) * | 2020-08-26 | 2020-12-01 | 徐州徐工矿业机械有限公司 | Pilot control oil way and control method for super-tonnage excavator |
| CN112012972B (en) * | 2020-08-26 | 2022-05-10 | 徐州徐工矿业机械有限公司 | Pilot control oil way and control method for super-tonnage excavator |
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Application publication date: 20180223 |