CN108591144A - The distributed direct of the double accumulators of the double constant displacement pumps of motor driving drives excavator hydraulic system - Google Patents
The distributed direct of the double accumulators of the double constant displacement pumps of motor driving drives excavator hydraulic system Download PDFInfo
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- CN108591144A CN108591144A CN201810709211.0A CN201810709211A CN108591144A CN 108591144 A CN108591144 A CN 108591144A CN 201810709211 A CN201810709211 A CN 201810709211A CN 108591144 A CN108591144 A CN 108591144A
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- 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
-
- 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
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
-
- 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
-
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The distributed direct that the present invention provides a kind of double accumulators of double constant displacement pumps of motor driving drives excavator hydraulic system, the driver is given by the controller input signal, rotating speed by the driver control per fluid die driving motor in the block and direction again, to realize the control to the hydraulic cylinder, the restriction loss and spill losses of system are avoided, system effectiveness is high, and major loop is shorter and does not have restricting element, therefore the pressure loss is few, calorific value is few, it may be unnecessary to cooling device；Two accumulators are used simultaneously, wherein second accumulator is for substituting fuel tank；First accumulator be used for when the discharge capacity of two constant displacement pumps than it is inconsistent with the effective area ratio of two chamber of the hydraulic cylinder when, flow for balancing the first chamber and second chamber solves the problems, such as the effective area ratio of two chambers of the discharge capacity of two constant displacement pumps than can not accurately match the hydraulic cylinder.
Description
Technical field
The present invention relates to excavator field, especially a kind of hydraulic system of excavator.
Background technology
Hydraulic crawler excavator is as most common machinery in engineering machinery, and there are oil consumption height, discharge is poor, capacity usage ratio is low
Disadvantage.It is on the rise under situation in energy shortage and problem of environmental pollution, how to realize the energy saving of excavator and reduce and discharge, more
Paid attention to by people to get over, becomes the hot spot studied at present.
Current excavator still uses the drive system of Engine-variable Pump System-multi-way valve-actuator.Since energy conservation and environmental protection is wanted
It asks, part research substitutes engine using common electric machine, but system effectiveness is still to be improved.With the phase of AC servomotor
After succeeding in developing, servo motor-quantitative hydraulic pump/motor-hydraulic valve-actuator has carried out engineer application, such as injection molding machine.These
Hydraulic system power-economizing method plays an important role in terms of improving efficiency.
Patent of invention CN201110453095 " a kind of all-electric servo excavator " (publication date 2013-07-03) is used
The electro-mechanical transmission and servo-drive system that AC servomotor is combined with ball-screw, it the advantages of be that electric energy is directly transformed to
Mechanical energy, simple system consume energy less, occupy little space.But when requiring low speed high torque, the operating mode contributed greatly, this electro-mechanical
Transmission will add retarder with servo-drive system could complete drive task, make complex system, even if adding retarder still sometimes
It cannot meet the requirements.
Patent of invention CN201610406357 " complete electrically driven (operated) hydraulic crawler excavator dynamical system " (publication date 2016-10-
12) the rotating speed size and rotary speed direction for, controlling each servo motor, to control the output of two-way quantitative connected to it pump
The size and Orientation of flow is finally completed the speed control to each hydraulic actuator.1. the system is driven using servo motor
Dynamic two-way quantitative pumps to control symmetrical hydraulic cylinder, and the effective area of hydraulic cylinder piston side reduces so that power output when piston stretches out
Significantly reduce.2. when system pressure is higher, drive the torque needed for constant displacement pump larger, height is required to motor performance, for example,
Torque, power bracket require wide.3. the system can not recycle the energy of over-running load feedback.
Invention content
The technical problem to be solved in the present invention is to provide a kind of distributed direct of the double accumulators of double constant displacement pumps of motor driving
Excavator hydraulic system is driven, the restriction loss and spill losses of system are avoided, system effectiveness is high, realizes energy saving, emission reduction and drop
It makes an uproar.
The invention is realized in this way：The distributed direct of the double accumulators of the double constant displacement pumps of motor driving drives excavator hydraulic pressure system
System, including controller, further include an at least hydraulic module；Include hydraulic cylinder, the first two-way quantitative pump, the per the hydraulic module
Two two-way quantitatives pump, the first accumulator, the second accumulator, three position three-way control valve, driver and driving motor；
The hydraulic cylinder includes cylinder body, piston and piston rod, and one end of the piston rod is fixedly connected on the piston, institute
It states piston air-tightness to be slidably connected in the cylinder body, and the cylinder interior is divided into first chamber and by the piston
Two chambers；
The three position three-way control valve includes the first oil-collecting hole, the first hydraulic control control port, the second oil-collecting hole, the second hydraulic control
Control port and third oil-collecting hole；
The first two-way quantitative pump includes the first drain tap, first port and second port；
The second two-way quantitative pump includes the second drain tap, third port and the 4th port；
It is connected to second accumulator after the second port and the 4th port parallel connection；The first port,
It is connected to the first chamber after one oil-collecting hole and the first hydraulic control control port parallel connection；The third port, the second oil-collecting hole with
And second be connected to the second chamber after hydraulic control control port parallel connection；The third oil-collecting hole is connected to first accumulator；
First drain tap is connected between the second port and the 4th port, and second drain tap is connected to the 4th end
Between mouth and the second accumulator,
The first two-way quantitative pump and the second two-way quantitative pump are connected to the driving motor, realize synchronous fortune
It is dynamic；The driver is communicatively coupled to the controller.
Further, further include supply unit, the driver, controller are electrically connected in the supply unit.
Further, further include the first control valve and the second control valve, the first port, first per the hydraulic module
It is sequentially connected to first control valve, the first chamber after oil-collecting hole and the first hydraulic control control port parallel connection；Described
It is sequentially connected to second control valve, described second after three ports, the second oil-collecting hole and the second hydraulic control control port parallel connection
Chamber；First control valve, the second control valve are also communicatively coupled to the controller respectively.
Further, first control valve, the second control valve are respectively two-position two-way solenoid valve.
Further, first control valve, the second control valve are respectively bi-bit bi-pass inserted valve.
Further, further include the first check valve, the second check valve, the first safety valve and second per the hydraulic module
Safety valve；
The second port, institute are parallel to after the outlet parallel connection of the entrance of first check valve and first safety valve
It is connected to first control valve and described first after stating the outlet of the first check valve and the entrance parallel connection of first safety valve
Between chamber；
Second accumulator is connected to after the outlet parallel connection of the entrance of second check valve and second safety valve,
It is connected to second control valve and described the after the outlet of second check valve and the entrance parallel connection of second safety valve
Between two chambers.
Further, the three position three-way control valve is three-position three way hydraulic valve.
Further, the three position three-way control valve is 3-position-3-way inserted valve.
Further, the driving motor is servo motor, and the driver is servo-driver.
Further, the quantity of the hydraulic module is three.
The invention has the advantages that：The present invention gives the driver by the controller input signal, then passes through institute
Rotating speed and direction of the driver control per fluid die driving motor in the block are stated, to realize the control to the hydraulic cylinder,
The restriction loss and spill losses of system are avoided, system effectiveness is high, and major loop is very short and does not have restricting element, therefore pressure is damaged
Lose less, calorific value it is few, do not need cooling device simultaneously use two accumulators, wherein second accumulator be used for substitute oil
Case；First accumulator is used for discharge capacity ratio and first chamber when first two-way quantitative pump and the second two-way quantitative pump
When the effective area ratio of room and second chamber is inconsistent, the flow for balancing the first chamber and second chamber solves
The discharge capacity ratio of the first two-way quantitative pump and the second two-way quantitative pump can not accurately match the first chamber and second chamber
Effective area ratio the problem of.
Description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the schematic diagram of an embodiment of hydraulic system of the present invention.
Fig. 2 is operation logic figure of the hydraulic module of the present invention in operating mode a period of time fluid.
Fig. 3 is the operation logic figure of hydraulic module of the present invention fluid in operating mode two.
Fig. 4 is the operation logic figure of hydraulic module of the present invention fluid in operating mode three.
Fig. 5 is the operation logic figure of hydraulic module of the present invention fluid in operating mode four.
Fig. 6 is the operation logic figure of hydraulic module of the present invention fluid in operating mode five.
Fig. 7 is the operation logic figure of hydraulic module of the present invention fluid in operating mode six.
Fig. 8 is the operation logic figure of hydraulic module of the present invention fluid in operating mode seven.
Fig. 9 is the operation logic figure of hydraulic module of the present invention fluid in operating mode eight.
Figure 10 is the effect diagram of the present invention.
In figure：100, controller；200, hydraulic module；201, hydraulic cylinder；2011, cylinder body；2012, piston；2013, piston
Bar；202, the first two-way quantitative pumps；2021, first port；2022, second port；2023, the first drain tap；203, second pair
To constant displacement pump；2031, third port；2032, the 4th port；2033, the second drain tap；204, the first accumulator；205, second
Accumulator；206, three position three-way control valve；2061, the first oil-collecting hole；2062, the first hydraulic control control port；2063, second oil is connect
Mouthful；2064, the second hydraulic control control port；2065, third oil-collecting hole；207, driver；208, driving motor；209, the first control
Valve；210, the second control valve；211, the first check valve；212, the second check valve；213, the first safety valve；214, the second safety
Valve；300, swing arm；400, dipper；500, scraper bowl；600, supply unit；700, first chamber；800, second chamber.
Specific implementation mode
It please refers to Fig.1 to shown in 10, the distributed direct that the present invention provides a kind of double accumulators of double constant displacement pumps of motor driving drives
Excavator hydraulic system, including controller 100 further include an at least hydraulic module 200；Include liquid per the hydraulic module 200
Cylinder pressure 201, the first two-way quantitative pump the 202, second two-way quantitative and pump the 203, first accumulator 204, the second accumulator 205, three
Three-way control valve 206, driver 207 and driving motor 208；
The hydraulic cylinder 201 includes cylinder body 2011, piston 2012 and piston rod 2013, and one end of the piston rod 2013 is solid
Surely it is connected to the piston 2012,2012 air-tightness of the piston is slidably connected in the cylinder body 2011, and the work
Plug 2012 will be divided into first chamber 700 and second chamber 800 inside the cylinder body 2011；
The three position three-way control valve 206 connects oil including the first oil-collecting hole 2061, the first hydraulic control control port 2062, second
The 2063, second hydraulic control control port 2064 of mouth and third oil-collecting hole 2065；
The first two-way quantitative pump 202 includes the first drain tap 2023, first port 2021 and second port 2022；
The second two-way quantitative pump 203 includes the second drain tap 2033, third port 2031 and the 4th port 2032；
It is connected to second accumulator 205 after the second port 2022 and 2032 parallel connection of the 4th port；It is described
It is connected to the first chamber 700 after 2062 parallel connection of first port 2021, the first oil-collecting hole 2061 and the first hydraulic control control port；
It is connected to the second chamber after 2064 parallel connection of the third port 2031, the second oil-collecting hole 2063 and the second hydraulic control control port
800；The third oil-collecting hole 2065 is connected to first accumulator 204；First drain tap 2023 is connected to described
Between Two-port netwerk 2022 and the 4th port 2032, second drain tap 2033 is connected to the 4th port 2032 and second and stores
Between energy device 205, it can prevent the first two-way quantitative pump 202 or the second two-way quantitative from pumping 203 hypertonia and shell occurs
Body ruptures, and ensure that safety；
The first two-way quantitative pump 202 and the second two-way quantitative pump 203 are connected to the driving motor 208, real
Now move synchronously；The driver 207 is communicatively coupled to the controller 100.
In specific implementation, the hydraulic cylinder 201 is asymmetrical cylinder 201, and the piston rod 2013 is connected to application
Load.The present invention gives the driver 207 by 100 input signal of the controller, then is controlled often by the driver 207
The rotating speed of driving motor 208 in the hydraulic module 200 and direction, and then control first two-way quantitative pump 202 and the
The flow and flow direction of two two-way quantitatives pump 203, the final control realized to the hydraulic cylinder 201.
First two-way quantitative is pumped the 202, second two-way quantitative pump 203 to be directly connected to driving motor 208 respectively, is come
It is independent to drive the hydraulic cylinder 201, it not only realizes the basic matching of 800 flow of the first chamber 700 and second chamber, also keeps away
Restriction loss and spill losses are exempted from, system effectiveness is high.
The distributed intelligence of fluid pressure line passing power is replaced to control with conducting wire so that major loop of the invention is very short and does not have
There is restricting element, therefore the pressure loss is few, calorific value is few, does not need cooling device.
Compared to conventional hydraulic, the present invention oily less, required first accumulator 204 and second using closed system use
Every hydraulic module 200 can be made hydraulic pressure packet form by the volume very little of accumulator 205.
The engine driving variable pump in traditional technology, system effectiveness is replaced to greatly improve using the driving motor 208,
Realize energy saving, emission reduction and noise reduction.Legacy system is switched on after work, and executing agency does not shut down not working, motor and oil pump
As usual it runs, energy consumption is big.And hydraulic cylinder 201 of the present invention is when needing work, the driving motor 208 operates, the liquid
When cylinder pressure 201 does not work, the driving motor 208 stalls, and realizes driving on demand, saves electric energy.
Present invention employs two accumulators, wherein second accumulator 205 is used to substitute fuel tank, and due to described
Hydraulic cylinder 201 is asymmetrical cylinder 201, and the first chamber 700 and second chamber 800 is caused to have significant surface product moment, this
The second accumulators of Shi Suoshu 205 also play balanced flow；And first accumulator 204 is used for when described first is two-way fixed
The effective area ratio of the discharge capacity ratio and the first chamber 700 and second chamber 800 of amount pump 202 and the second two-way quantitative pump 203
When inconsistent, the flow for balancing the first chamber 700 and second chamber 800 solves the first two-way quantitative pump
202 and second the discharge capacity ratio of two-way quantitative pump 203 can not accurately match the effective of the first chamber 700 and second chamber 800
The problem of area ratio.
And in specific implementation, the first two-way quantitative pump 202 and the second two-way quantitative pump 203 can be used as pump respectively
And motor, the present invention is also that the potential energy of load feedback is recycled the condition of providing at this time.
In specific implementation, a preferred embodiment：Further include supply unit 600, the driver 207, controller 100
It is electrically connected in the supply unit 600, in the case of over-running load, first two-way quantitative pumps 202 and second pair
It is used to constant displacement pump 203 as motor, can be power storage to the supply unit by the potential energy of load feedback at this time
In 600, energy when realizing to over-running load is recycled, and saves electric energy.
Further include the first control valve 209 and the second control valve 210 per the hydraulic module 200, the first port 2021,
First control valve 209, described is sequentially connected to after 2062 parallel connection of first oil-collecting hole 2061 and the first hydraulic control control port
First chamber 700；After 2064 parallel connection of the third port 2031, the second oil-collecting hole 2063 and the second hydraulic control control port successively
It is connected to second control valve 210, the second chamber 800；First control valve 209, the second control valve 210 are also distinguished
It is communicatively coupled to the controller 100, first control valve, 209 and second control valve 210 is controlled by the controller 100
Lead to or closes.The hydraulic cylinder 201 is locked by first control valve 209, the second control valve 210, is avoided due to described
It is slided caused by the leakage of one two-way constant displacement pump 202 or the second two-way quantitative pump 203.
First control valve 209, the second control valve 210 are respectively two-position two-way solenoid valve.Two are used when small flow
Two-way electromagnetic valve is mainly used in practice in mini-excavator.
First control valve 209, the second control valve 210 are respectively bi-bit bi-pass inserted valve.Two are used when big flow
Two-way plug-in valve, be mainly used in practice it is small, in, large excavator.
Further include per the hydraulic module 200 first check valve 211, the second check valve 212, the first safety valve 213 and
Second safety valve 214；
It is parallel to described second after the outlet parallel connection of the entrance of first check valve 211 and first safety valve 213
It is connected to described first after port 2022, the outlet of first check valve 211 and the entrance parallel connection of first safety valve 213
Between control valve 209 and the first chamber 700；
It is connected to described second after the outlet parallel connection of the entrance of second check valve 212 and second safety valve 214
It is connected to described the after accumulator 205, the outlet of second check valve 212 and the entrance parallel connection of second safety valve 214
Between two control valves 210 and the second chamber 800.It is combined by first check valve, 211 and first safety valve 213, or
Second check valve 212 and the combination of the second safety valve 214, prevent emptying phenomenon in low pressure, pressure release are carried out in high pressure, will
Extra fluid is stored into second accumulator 205, specifically, when the first chamber 700 or the pressure of second chamber 800
When power is low, corresponding first check valve, 211 or second check valve 212 conducting, fluid is mended from second accumulator 205
It is charged in the first chamber 700 or second chamber 800；When the first chamber 700 or the hypertonia of second chamber 800
When, first safety valve, 213 or second safety valve 214 conducting corresponding at this time carries out pressure release, extra fluid is flowed into
In second accumulator 205, ensure safety.
The three position three-way control valve 206 is three-position three way hydraulic valve.
The three position three-way control valve 206 is 3-position-3-way inserted valve.
The driving motor 208 is servo motor 208, and the driver 207 is servo-driver 207, and control can be made fast
It is very accurate to spend precision.
The quantity of the hydraulic module 200 is three.Three 200 respective piston rods 2013 of the hydraulic module are distinguished
It connects one to one in the swing arm 300, dipper 400, scraper bowl 500 of excavator, realizes that three independently drives, facilitate control,
High degree shortens pipeline simultaneously, the hydraulic module 200 can be made hydraulic pressure packet form, is directly installed on swing arm
300, dipper 400, near scraper bowl 500, it is easy for installation, it is small.
Specific control principle：
Because of the presence of the piston rod 2013, the first chamber 700 and second chamber 800 are unsymmetric structure, are made
The maximum volume for obtaining the first chamber 700 is more than the maximum volume of the second chamber 800, and the hydraulic cylinder 201 is non-right
Claim hydraulic cylinder 201, when fluid is transported to the second chamber 800 from the first chamber 700, it is extra that fluid has, need by
In extra fluid storage to second accumulator 205, and when fluid is transported to first chamber from the second chamber 800
When room 700, the fluid in second accumulator 205 is needed to add in the first chamber 700.
On the other hand, F is to load the external force for being applied to the piston rod 2013 in Fig. 2 to Fig. 9, and v is the piston rod
2013 speed of service；The direction of hydraulic pressure force direction and external force F are opposite；The piston rod 2013 is connected to the load of excavator,
The load of excavator will produce potential energy during the work time；The first two-way quantitative pump 202 and the second two-way quantitative pump 203 were both
It can be used as pump, motor is can also be used as and generate electricity；
Positive value load：Hydraulic pressure force direction is identical as the direction of v, and the piston rod 2013 is stretched out or retracted, at this time the electricity
Source device 600 exports electric energy, and the controller 100 controls the driver 207 and the servo motor 208 is driven to drive described the
One two-way constant displacement pump 202 and the second two-way quantitative pump 203 are rotated by the rotating speed and direction of controller setting, the piston rod 2013
Energy is exported to load；
Over-running load：The direction of hydraulic pressure force direction and v are on the contrary, the piston rod 2013 stretching or retraction, load feedback energy
It measures to the piston rod 2013, the first two-way quantitative pump 202 and the second two-way quantitative pump 203 is made by hydraulic circuit
It generates electricity as motor, stores energy to the supply unit 600, be recycled；
The discharge capacity of the first two-way quantitative pump 202 is labeled as Vp_a, the second two-way quantitative pump 203 discharge capacity be labeled as
Vp_b, the effective area of the first chamber 700 is labeled as A1, 800 effective area of second chamber is labeled as A2；Work as Vp_b/Vp_aWith
A2/A1When mismatch, there are following two situations：
Situation one, Vp_b/Vp_aMore than A2/A1；There is following four operating mode at this time：
Operating mode one please refers to shown in Fig. 2, is now in over-running load, and the pressure of the first chamber 700 is more than described the
The pressure of two chambers 800, fluid flow to the first chamber 700, the first hydraulic control control port from the second chamber 800
2062 second oil-collecting hole 2063 of the three position three-way control valve 206 and first accumulator 204 are connected, and described at this time
Fluid in one accumulator 204 adds in the fluid of the outflow of the second chamber 800, the oil in second accumulator 205
Liquid stream goes out, and adds in the first two-way quantitative pump 202, and first chamber is transported to by first two-way quantitative pump 202
Room 700, to realize in the first chamber 700 and second chamber 800 flow equilibrium, while first two-way quantitative pumps
202 and second two-way quantitative pump 203 by the potential energy for loading feedback be electric energy, and store in the supply unit 600 into
Row recycles, and has saved electric energy.
Operating mode two please refers to shown in Fig. 3, is now in positive value load, and the pressure of the second chamber 800 is more than described the
The pressure of one chamber 700, fluid flow to the first chamber 700, the second hydraulic control control port from the second chamber 800
2064 first oil-collecting hole 2061 of the three position three-way control valve 206 and first accumulator 204 are connected, and described at this time
Fluid in one accumulator 204 directly adds in the first chamber 700, the fluid outflow in second accumulator 205,
It adds in the first two-way quantitative pump 202, the first chamber 700 is transported to by first two-way quantitative pump 202, from
And realize the flow equilibrium in the first chamber 700 and second chamber 800, the piston rod 2013 exports energy to negative at this time
It carries.
Operating mode three please refers to shown in Fig. 4, is now in positive value load, and the pressure of the first chamber 700 is more than described the
The pressure of two chambers 800, fluid flow to the second chamber 800, the first two-way quantitative pump from the first chamber 700
The fluid of 202 outputs is flowed to respectively in second accumulator 205 and second two-way quantitative pump 203, first hydraulic control
Second oil-collecting hole 2063 of the three position three-way control valve 206 and first accumulator 204 are connected for control port 2062, this
A flow part for 203 output of the second two-way quantitatives of Shi Suoshu pump flows into first accumulator 204, another part fluid stream
Enter in the second chamber 800, it is described at this time to realize the flow equilibrium in the first chamber 700 and second chamber 800
Piston rod 2013 exports energy to load.
Operating mode four please refers to shown in Fig. 5, is now in over-running load, and the pressure of the second chamber 800 is more than described the
The pressure of one chamber 700, fluid flow to the second chamber 800, the second hydraulic control control port from the first chamber 700
2064 first oil-collecting hole 201 of the three position three-way control valve 206 and first accumulator 204 are connected, first chamber
The fluid part that room 700 is flowed out is flowed by first oil-collecting hole 2061 in first accumulator 204, another part
It is transported in the second two-way quantitative pump 203 and the second accumulator 205 by first two-way quantitative pump 202, to real
Show the flow equilibrium in the first chamber 700 and second chamber 800, first two-way quantitative pumps 202 and second pair at this time
By the potential energy for loading feedback it is electric energy to constant displacement pump 203, and stores to being recycled in the supply unit 600,
Electric energy is saved.
Situation two, Vp_b/Vp_aLess than A2/A1；There is following four operating mode at this time：
Operating mode five please refers to shown in Fig. 6, is now in over-running load, and the pressure of the first chamber 700 is more than described the
The pressure of two chambers 800, fluid flow to the first chamber 700, the first hydraulic control control port from the second chamber 800
2062 second oil-collecting hole 2063 of the three position three-way control valve 206 and first accumulator 204 are connected, and described at this time
A fluid part for two chambers 800 outflow flows into first accumulator 204, and another part flows to second two-way quantitative
Pump 203 is delivered in the first two-way quantitative pump 202, and the fluid outflow in second accumulator 205, is added to described
In first two-way quantitative pump 202, the first chamber 700 is transported to by first two-way quantitative pump 202, described in realizing
Flow equilibrium in first chamber 700 and second chamber 800, while first two-way quantitative pump 202 and the second two-way quantitative
The potential energy for loading feedback is electric energy by pump 203, and is stored into the supply unit 600 and be recycled, and is saved
Electric energy.
Operating mode six please refers to shown in Fig. 7, is now in positive value load, and the pressure of the second chamber 800 is more than described the
The pressure of one chamber 700, the second hydraulic control control port 2064 is by the first oil-collecting hole of the three position three-way control valve 206
2061 and first accumulator 204 conducting, fluid flow to the first chamber 700 from the second chamber 800, described second
Fluid in accumulator 205 adds in the first two-way quantitative pump 202, the oil of 202 output of the first two-way quantitative pump
A liquid part flows into the first chamber 700, and another part flows into first accumulator by first oil-collecting hole 2061
In 204, to realize the flow equilibrium in the first chamber 700 and second chamber 800, the piston rod 2013 exports at this time
Energy is to load.
Operating mode seven please refers to shown in Fig. 8, is now in positive value load, and the pressure of the first chamber 700 is more than described the
The pressure of two chambers 800, the first hydraulic control control port 2062 is by the second oil-collecting hole of the three position three-way control valve 206
2063 and first accumulator 204 conducting, fluid flow to the second chamber 800 from the first chamber 700, described first
A fluid part for 202 output of two-way quantitative pump flows into second accumulator 205, and it is two-way that another part flows into described second
In constant displacement pump 203, the second chamber 800 is flowed into afterwards, while the fluid in first accumulator 204 connects by described second
Hydraulic fluid port 2063 flows into the second chamber 800, to realize that the flow in the first chamber 700 and second chamber 800 is flat
It weighs, the piston rod 2013 exports energy to load at this time.
Operating mode eight please refers to shown in Fig. 9, is now in over-running load, and the pressure of the second chamber 800 is more than described the
The pressure of one chamber 700, fluid flow to the second chamber 800, the second hydraulic control control port from the first chamber 700
2064 first oil-collecting hole 2061 of the three position three-way control valve 206 and first accumulator 204 are connected, and described at this time
The fluid of one chamber 700 outflow flows in first two-way quantitative pump 202, and the fluid in first accumulator 204 from
First oil-collecting hole 2061 is flowed into the first two-way quantitative pump 202, the oil of 202 output of the first two-way quantitative pump
A liquid part flows into the second chamber 800 by second two-way quantitative pump 203, and another part flows into second accumulation of energy
In device 205, to realize the flow equilibrium in the first chamber 700 and second chamber 800, while first two-way quantitative
It is electric energy that pump 202 and the second two-way quantitative, which pump 203 by the potential energy for loading feedback, and is stored into the supply unit 600
It is recycled, has saved electric energy.
Although specific embodiments of the present invention have been described above, those familiar with the art should manage
Solution, we are merely exemplary described specific embodiment, rather than for the restriction to the scope of the present invention, it is familiar with this
The technical staff in field modification and variation equivalent made by the spirit according to the present invention, should all cover the present invention's
In scope of the claimed protection.
Claims (10)
1. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving drives excavator hydraulic system, including controller, feature exist
In：It further include an at least hydraulic module；Include hydraulic cylinder, the first two-way quantitative pump, the second two-way quantitative per the hydraulic module
Pump, the first accumulator, the second accumulator, three position three-way control valve, driver and driving motor；
The hydraulic cylinder includes cylinder body, piston and piston rod, and one end of the piston rod is fixedly connected on the piston, the work
Plug air-tightness is slidably connected in the cylinder body, and the cylinder interior is divided into first chamber and the second chamber by the piston
Room；
The three position three-way control valve includes the first oil-collecting hole, the first hydraulic control control port, the second oil-collecting hole, the second hydraulic control control
Hydraulic fluid port and third oil-collecting hole；
The first two-way quantitative pump includes the first drain tap, first port and second port；
The second two-way quantitative pump includes the second drain tap, third port and the 4th port；
It is connected to second accumulator after the second port and the 4th port parallel connection；The first port, first connect
It is connected to the first chamber after hydraulic fluid port and the first hydraulic control control port parallel connection；The third port, the second oil-collecting hole and
It is connected to the second chamber after two hydraulic control control port parallel connections；The third oil-collecting hole is connected to first accumulator；It is described
First drain tap is connected between the second port and the 4th port, second drain tap be connected to the 4th port and
Between second accumulator,
The first two-way quantitative pump and the second two-way quantitative pump are connected to the driving motor, and realization moves synchronously；Institute
It states driver and is communicatively coupled to the controller.
2. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving according to claim 1 drives excavator hydraulic system,
It is characterized in that：Further include supply unit, the driver, controller are electrically connected in the supply unit.
3. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving according to claim 1 or 2 drives excavator hydraulic pressure system
System, it is characterised in that：Further include the first control valve and the second control valve per the hydraulic module, the first port, first connect
It is sequentially connected to first control valve, the first chamber after hydraulic fluid port and the first hydraulic control control port parallel connection；The third
It is sequentially connected to second control valve, second chamber after port, the second oil-collecting hole and the second hydraulic control control port parallel connection
Room；First control valve, the second control valve are also communicatively coupled to the controller respectively.
4. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving according to claim 3 drives excavator hydraulic system,
It is characterized in that：First control valve, the second control valve are respectively two-position two-way solenoid valve.
5. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving according to claim 3 drives excavator hydraulic system,
It is characterized in that：First control valve, the second control valve are respectively bi-bit bi-pass inserted valve.
6. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving according to claim 3 drives excavator hydraulic system,
It is characterized in that：Further include the first check valve, the second check valve, the first safety valve and the second safety per the hydraulic module
Valve；
It is parallel to the second port after the outlet parallel connection of the entrance of first check valve and first safety valve, described
It is connected to first control valve and the first chamber after the outlet of one check valve and the entrance parallel connection of first safety valve
Between；
Second accumulator is connected to after the outlet parallel connection of the entrance of second check valve and second safety valve, it is described
It is connected to second control valve and second chamber after the outlet of second check valve and the entrance parallel connection of second safety valve
Between room.
7. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving according to claim 1 or 2 drives excavator hydraulic pressure system
System, it is characterised in that：The three position three-way control valve is three-position three way hydraulic valve.
8. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving according to claim 1 or 2 drives excavator hydraulic pressure system
System, it is characterised in that：The three position three-way control valve is 3-position-3-way inserted valve.
9. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving according to claim 1 or 2 drives excavator hydraulic pressure system
System, it is characterised in that：The driving motor is servo motor, and the driver is servo-driver.
10. the distributed direct of the double accumulators of the double constant displacement pumps of motor driving according to claim 1 or 2 drives excavator hydraulic pressure system
System, it is characterised in that：The quantity of the hydraulic module is three.
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| CN201810709211.0A CN108591144B (en) | 2018-07-02 | 2018-07-02 | Hydraulic system of motor-driven double-dosing pump double-accumulator distributed direct-drive excavator |
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|---|---|---|---|
| CN201810709211.0A CN108591144B (en) | 2018-07-02 | 2018-07-02 | Hydraulic system of motor-driven double-dosing pump double-accumulator distributed direct-drive excavator |
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| CN109944836A (en) * | 2019-03-21 | 2019-06-28 | 福建工程学院 | A kind of servo motor drives the distributed direct Driving force system of double constant displacement pumps |
| CN112631133A (en) * | 2020-12-28 | 2021-04-09 | 江苏师范大学 | Hydraulic position servo system control method based on double energy accumulators |
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| CN114233699A (en) * | 2021-11-09 | 2022-03-25 | 杭州宝协机电科技有限公司 | Separable hydraulic cylinder double-acting energy feedback system and method thereof |
| CN115478572A (en) * | 2022-07-29 | 2022-12-16 | 浙江大学 | Engineering mechanical equipment and distributed electric hydrostatic hydraulic driving system thereof |
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