CN106284481A - Determine varying load sensitivity combining hydraulic system and loader - Google Patents
Determine varying load sensitivity combining hydraulic system and loader Download PDFInfo
- Publication number
- CN106284481A CN106284481A CN201610810433.2A CN201610810433A CN106284481A CN 106284481 A CN106284481 A CN 106284481A CN 201610810433 A CN201610810433 A CN 201610810433A CN 106284481 A CN106284481 A CN 106284481A
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- valve
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- hydraulic system
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- hydraulic
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Classifications
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- 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
- E02F9/2221—Control of flow rate; Load sensing arrangements
-
- 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
- E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
-
- 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
- E02F9/225—Control of steering, e.g. for hydraulic motors driving the vehicle tracks
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The present invention relates to a kind of hydraulic system, when determining hydraulic system of working action in variable delivery hydraulic system for solution is existing, steering variable pump cannot realize the Ioad-sensing control problem to hydraulic system of working；Thering is provided a kind of load-sensitive combining hydraulic system and loader, including steering hydraulic system and hydraulic system of working, steering hydraulic system includes variable pump, pressure-gradient control valve, steering gear, steering cylinder etc.；Hydraulic system of working includes dosing pump, distributing valve, hydraulic pressure executive item, pilot valve etc., by the first shuttle valve group by the hydraulic control end of the pressure signal transmission on guide's oil circuit to two-position three-way valve；By the second shuttle valve group, the load pressure signal in working oil path is transferred to the A mouth of two-position three-way valve；By shuttle valve, steering load signal and working oil path load signal are transferred to variable pump, it is achieved the Ioad-sensing control of hydraulic system of working.
Description
Technical field
The present invention relates to a kind of hydraulic system, determine varying load sensitivity combining hydraulic system more particularly, it relates to a kind of
And loader.
Background technology
Mostly using hydraulic system in engineering machinery, domestic existing most loader hydraulic system is quantitative hydraulic system
System.Its hydraulic system is by dosing pump, steering gear, flux amplification valve (pressure-gradient control valve), steering cylinder, distributing valve, boom cylinder, rotating bucket
The element compositions such as oil cylinder.In existing loading machine quantitative hydraulic system, have ignored the energy loss of dosing pump.Owing to pumpage is
Definite value, flow system flow is only relevant with engine speed；When individually turning to, removing and turn to outside required flow, unnecessary flow leads to
Cross position in distributing valve and, with certain back pressure oil sump tank, cause energy loss；When comfortable property, steering cylinder, boom cylinder and
Rotary ink tanks etc. are all failure to actuate, and the flow of dosing pump output flows back to fuel tank by position in distributing valve and with certain back pressure, produces
Energy loss；In work process, when load pressure is higher than default pressure, the flow of dosing pump output is with certain off-load
Pressure or oil pressure relief flow back to fuel tank, produce high pressure unloading loss and spill losses.
External existing loader based on variable delivery hydraulic system, its hydraulic system by variable pump, load-sensitive steering gear,
The element compositions such as flux amplification valve, steering cylinder, load-sensitive valve, boom cylinder and rotational fuel tank；Its deficiency existed is: work
Making hydraulic system and steering hydraulic system all uses variable pump, it is relatively costly；For overcoming this Cost Problems, existing loader
Generally use and determine variable system, steering hydraulic system i.e. uses variable pump, hydraulic system of working uses dosing pump, turns to liquid
Pressure system is collaborated with hydraulic system of working, preferentially meets and turns to unnecessary flow in necessary flow rear steering hydraulic system to collaborate
In hydraulic system of working.In this hydraulic system, its variable part is mainly used in steering, in hydraulic system of working action
Time, load-reacting pump just becomes a dosing pump with cutting function, it is impossible to realize the load to hydraulic system of working
Sensitive control.
Summary of the invention
The technical problem to be solved in the present invention is to determine hydraulic system of working in variable delivery hydraulic system for existing loader to move
When making, steering variable pump cannot realize the Ioad-sensing control problem to hydraulic system of working, and provides a kind of load-sensitive interflow
Hydraulic system and there is the loader of this hydraulic system.
The present invention is such that providing one to determine varying load sensitivity interflow hydraulic pressure system for the technical scheme realizing its purpose
System, including steering hydraulic system and hydraulic system of working, described steering hydraulic system includes variable pump, pressure-gradient control valve, steering gear, turns
To oil cylinder, the P mouth of described variable pump is connected with steering gear through pressure-gradient control valve, and steering cylinder is connected with steering gear；Described working hydraulic pressure
System includes that the distributing valve that dosing pump is connected with dosing pump is connected the hydraulic pressure executive item controlled by distributing valve and divides with distributing valve
Join the pilot valve that valve hydraulic control end connects, it is characterised in that include the first shuttle valve group, the second shuttle valve group, shuttle valve and two-position three-way valve；
Guide's oil circuit that each oil-in of described first shuttle valve group is corresponding with between described pilot valve and distributing valve is connected, institute
The hydraulic control end of the oil-out and described two-position three-way valve of stating the first shuttle valve group is connected by the pressure signal transmission on guide's oil circuit extremely
The hydraulic control end of two-position three-way valve；
Each oil-in working oil path corresponding with between described distributing valve and hydraulic pressure executive item of described second shuttle valve group is even
Connecing, the described oil-out of the second shuttle valve group is connected the load pressure signal transmission in working oil path with the A mouth of two-position three-way valve
A mouth to two-position three-way valve；
Two oil-ins of described shuttle valve are connected with the LS1 mouth of described pressure-gradient control valve and the B mouth of two-position three-way valve respectively, described
The T mouth of two-position three-way valve is connected with fuel tank loop, and the oil-out of described shuttle valve is connected with the LS mouth of described variable pump；
When the hydraulic control end of two-position three-way valve has pressure signal, its B mouth turns on A mouth.In the present invention, by the first shuttle
Valve group draws pilot pressure signal, draws working oil path pressure signal by the second valve group, and with pilot pressure signal by two
Position three-way valve controls whether to transmit working oil path signal, then steering load pressure signal and working oil path signal is entered by shuttle valve
Row contrast, the pressure signal that pressure force value is bigger is transferred to variable pump as load signal, it is achieved Ioad-sensing control.
Above-mentioned determine in varying load sensitivity combining hydraulic system, described hydraulic pressure executive item include the first hydraulic pressure executive item,
Two hydraulic pressure executive items；Described distributing valve include the first reversal valve of being connected with described first hydraulic pressure executive item and with the second hydraulic pressure
The second reversal valve that executive item connects, described pilot valve includes the first pilot valve being connected with the first reversal valve hydraulic control end
And the second pilot valve being connected with the second reversal valve.
Above-mentioned determine, in varying load sensitivity combining hydraulic system, also to include guide oil source valve, entering of described guide oil source valve
Hydraulic fluid port connects with the oil-out of variable pump through oil filter, and the oil-out of described guide oil source valve is through guide check valve and described guide
The pressure oil-in connection of valve.
Above-mentioned determine, in varying load sensitivity combining hydraulic system, also to include unloader, the work oil-out of described unloader
Connect with the P mouth of distributing valve and the oil-out of dosing pump with work oil-in correspondence, unloading port connected tank loop, unloader
The oil-out connection of LS0 mouth and the first shuttle valve group.
The present invention is such that providing a kind of loader for another technical scheme realizing its purpose, and this loader comprises
Such scheme determines varying load sensitivity combining hydraulic system.Wherein said hydraulic pressure executive item is boom cylinder and rotating bucket oil
Cylinder.
The present invention compared with prior art, has the advantage that
(1), in work system is opened under conditions of position, load-reacting pump i.e. achieves turn to and work negative
Carry sensitivity to control, the maximized volumetric speed control characteristic utilizing load sensitive pump.
(2) variable pump is the most still load sensitive pump, continues to play the characteristic of its volumetric speed control, and relatively quantitative system does not has
There is spill losses, the most energy-conservation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that loader of the present invention determines varying load sensitivity combining hydraulic system.
Parts title and sequence number in figure:
Variable pump 1, pressure-gradient control valve 2, steering gear 3, steering cylinder the 4, first shuttle valve group 5, boom cylinder 6, rotary ink tank 7, shuttle
Valve 8, two-position three-way valve the 9, second shuttle valve group 10, distributing valve 11, pilot valve 12, guide oil source valve 13, unloader 14, two-bit triplet
Valve 141, pilot operated valve device 142, switch valve 143, dosing pump 15.
Detailed description of the invention
Specific embodiments is described below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of loader determines varying load sensitivity combining hydraulic system, including steering hydraulic in the present embodiment
System and hydraulic system of working, steering hydraulic system includes variable pump 1, pressure-gradient control valve 2, steering gear 3, steering cylinder 4；Variable pump 1
P mouth oil-in with pressure-gradient control valve 2 by the road be connected, the oil-out of pressure-gradient control valve 2 is connected with steering gear 3, the A hydraulic fluid port of steering gear and
B hydraulic fluid port is connected with big chamber and the loculus of steering cylinder 4, and the LS1 mouth of pressure-gradient control valve 2 connects with the LS2 mouth of steering gear 3 by the road.
Hydraulic system of working includes dosing pump 15, unloader 14, distributing valve 11, boom cylinder 6, rotary ink tank 7.Distributing valve
11 include the first reversal valve being connected with boom cylinder and the second reversal valve being connected with rotary ink tank, wherein swing arm oil
Cylinder 6 be the first hydraulic pressure executive item, rotary ink tank 7 be the second hydraulic actuator；Unloader 14 is connected to dosing pump 15 and distribution
Between valve 11, the work oil-out of unloader 14 and the work corresponding P mouth with distributing valve 11 of oil-in and dosing pump 15 fuel-displaced
Mouth connection, unloading port connected tank loop.Interflow oil-out on pressure-gradient control valve 2 is connected with the work oil-out of unloader, is formed and closes
Stream oil circuit.
The corresponding distributing valve 11 of pilot valve 12, it may have two, through four tunnel guide's oil circuit and the first reversal valves and second
The two ends hydraulic control end of reversal valve connects.Boom cylinder 6 and the big chamber of rotary ink tank 7 and loculus through four tunnel working oil path with corresponding
The actuator port of the first reversal valve and the second reversal valve is connected；Thus realize the control of boom cylinder and rotary ink tank.
First shuttle valve group 5 has four oil-ins, the corresponding four tunnel guides corresponding with between pilot valve 12 and distributing valve 11
Oil circuit connects, and the oil-out of the first shuttle valve group 5 is connected on guide's oil circuit with the hydraulic control end of the two-position three-way valve 141 of unloader 14
Pressure signal transmission to the hydraulic control end of two-position three-way valve 9, the LS0 mouth of unloader 14 and the oil-out of the first shuttle valve group 5 simultaneously
Connection；
Four tunnel working oil path between four oil-ins correspondences and distributing valve and the hydraulic pressure executive item of the second shuttle valve group 10 are even
Connecing, the oil-out of the second shuttle valve group 10 is connected with the A mouth of two-position three-way valve 9 and is transferred to by the load pressure signal in working oil path
The A mouth of two-position three-way valve 9；
One oil-in of shuttle valve 8 is connected with the LS2 mouth of steering gear 3, and another oil-in is oily with the B of two-position three-way valve 9
Mouth connection, the oil-out of shuttle valve 8 is connected with the load feedback mouth LS mouth of variable pump 1.Have when the hydraulic control end of two-position three-way valve 9 has
During the pressure signal of effect, two-position three-way valve 9 is in bottom, and its A mouth and B mouth turn on, as hydraulic control end effective of two-position three-way valve 9
After pressure signal is removed, two-position three-way valve 9 is in upper, and its B mouth turns on T mouth, and T mouth is connected with fuel tank loop.
The oil-in of guide oil source valve 13 is connected through the oil-out of oil filter with variable pump 1, guide oil source valve 13 fuel-displaced
Mouth is connected with pilot valve 12 through stop valve, it is achieved to pilot valve fuel feeding.
The operation principle of above-mentioned hydraulic system is as follows:
1, complete machine idling attonity operating mode, due to steering hydraulic system and hydraulic system of working equal no pressure signal, namely
Two-position three-way valve 9 is in bottom, and the LS2 mouth of steering gear 3 also unloading pressure signal exports, so the load feedback of variable pump 1
The pressure of mouth LS mouth is zero, and now, the pumping hole P of variable pump 1 maintains a low pressure, and discharge capacity is almost nil, does not open middle bit-loss；
The pressure of the LS0 mouth of unloader 14 is zero, and the two-position three-way valve 141 in unloader 14 acts on upper, the switch of unloader 14
Valve 143 is opened, the oil-out of the dosing pump direct oil sump tank of switch valve 143 in unloader 14, decreases out middle bit-loss.
2, independent steering situation, namely hydraulic system of working attonity, guide's oil circuit does not have effective pressure signal,
The pressure of the LS0 mouth of unloader 14 is zero, and the two-position three-way valve 141 in unloader acts on upper, the switch valve of unloader 14
143 open, the oil-out of the dosing pump 15 direct oil sump tank of switch valve 143 in unloader 14, decrease out middle bit-loss；
When steering gear 3 has action, it is connected, simultaneously with the LS1 signal of pressure-gradient control valve 2 by the steering pressure signal LS2 of steering gear 3 extraction
The LS mouth of variable pump 1 it is delivered to so that variable pump 1 increases discharge capacity, until meeting the stream required for steering through shuttle valve 8
Amount；
3, work independently operating mode, the first pilot when pilot valve 12 has action, on guide's oil circuit of the first shuttle valve group 5 extraction
Force signal is applied to the LS0 mouth of unloader 14 so that the two-position three-way valve 141 in unloader 14 acts on bottom, unloader 14
Switch valve 143 close so that dosing pump 15 fluid enter distributing valve 11；Meanwhile, by the elder generation of the first shuttle valve group 5 extraction
Pilot force signal is also applied to the hydraulic control end of two-position three-way valve, promotes two-position three-way valve 9 commutation to make it act on upper, the second shuttle
The load pressure signal of valve group 10 extraction is delivered on shuttle valve 8 through A mouth and the B oral instructions of two-position three-way valve and then is delivered to variable pump
LS mouth so that variable pump increase discharge capacity, the hydraulic oil that variable pump pumps out flows to distributing valve, directly through the interflow oil-out of pressure-gradient control valve
To the flow met required for work system, it is achieved the variable pump Ioad-sensing control to work system；
When load pressure is more than the spring force of the pilot operated valve device 142 of unloader 14, two-position three-way valve 141 warp of unloader 14
Crossing pilot operated valve device to be connected with fuel tank loop, the switch valve 143 of unloader 14 is opened, and makes the oil-out of dosing pump 15 through unloader
The direct oil sump tank of switch valve 143 in 14, does not has high pressure kicks to lose.
4, when steering and work system action simultaneously, by the steering pressure signal LS2 of steering gear 3 extraction with excellent
The LS1 signal of first valve is connected, and is applied to shuttle valve 8；Meanwhile, passed through by the load pressure signal of the second shuttle valve group 10 extraction
Two-position three-way valve is applied on shuttle valve 8；Through the comparison of shuttle valve 8, the pressure signal that extraction is bigger, through the oil-out of shuttle valve 8
Being eventually transferred to the LS mouth of variable pump, the flow of variable pump 1 output preferentially meets outside the demand of steering, flow warp more than needed
Interflow oil-out supply hydraulic system.
Claims (6)
1. determine a varying load sensitivity combining hydraulic system, including steering hydraulic system and hydraulic system of working, described in turn to
Hydraulic system includes variable pump, pressure-gradient control valve, steering gear, steering cylinder, and the P mouth of described variable pump is through pressure-gradient control valve with steering gear even
Connecing, steering cylinder is connected with steering gear；Described hydraulic system of working include distributing valve that dosing pump is connected with dosing pump and point
Join valve and connect the pilot valve that the hydraulic pressure executive item that controlled by distributing valve is connected with distributing valve hydraulic control end, it is characterised in that include the
One shuttle valve group, the second shuttle valve group, shuttle valve and two-position three-way valve；
Guide's oil circuit that each oil-in of described first shuttle valve group is corresponding with between described pilot valve and distributing valve is connected, described
The oil-out of one shuttle valve group is connected the pressure signal transmission on guide's oil circuit to two with the hydraulic control end of described two-position three-way valve
The hydraulic control end of three-way valve；
Each oil-in working oil path corresponding with between described distributing valve and hydraulic pressure executive item of described second shuttle valve group connects, institute
The A mouth of the oil-out and two-position three-way valve of stating the second shuttle valve group is connected the load pressure signal in working oil path is transferred to two
The A mouth of three-way valve；
Two oil-ins of described shuttle valve are connected with the LS1 mouth of described pressure-gradient control valve and the B mouth of two-position three-way valve respectively, described two
The T mouth of three-way valve is connected with fuel tank loop, and the oil-out of described shuttle valve is connected with the LS mouth of described variable pump；
When the hydraulic control end of two-position three-way valve has pressure signal, its B mouth turns on A mouth.
The most according to claim 1 determine varying load sensitivity combining hydraulic system, it is characterised in that described hydraulic pressure executive item
Including the first hydraulic pressure executive item, the second hydraulic pressure executive item；Described distributing valve includes be connected with described first hydraulic pressure executive item
One reversal valve and the second reversal valve being connected with the second hydraulic pressure executive item, described pilot valve includes and the first reversal valve liquid
Control the first pilot valve that end connects and the second pilot valve being connected with the second reversal valve.
The most according to claim 1 and 2 determine varying load sensitivity combining hydraulic system, it is characterised in that also include guide oil
Source valve, the oil-in of described guide oil source valve connects with the oil-out of variable pump through oil filter, described guide oil source valve fuel-displaced
Mouth connects with the pressure oil-in of described pilot valve through guide check valve.
The most according to claim 1 and 2 determine varying load sensitivity combining hydraulic system, it is characterised in that also include off-load
Valve, the work oil-out of described unloader connects with the P mouth of distributing valve and the oil-out of dosing pump with work oil-in correspondence,
Unloading port connected tank loop, the LS0 mouth of unloader and the oil-out connection of the first shuttle valve group.
5. a loader, it is characterised in that include that the varying load sensitivity of determining according to any one of Claims 1-4 collaborates liquid
Pressure system.
Loader the most according to claim 5, it is characterised in that described hydraulic pressure executive item include the first hydraulic pressure executive item,
Two hydraulic pressure executive items, described first hydraulic pressure executive item, the second hydraulic pressure executive item are respectively boom cylinder and rotary ink tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610810433.2A CN106284481B (en) | 2016-09-08 | 2016-09-08 | Determine varying load sensitivity combining hydraulic system and loading machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610810433.2A CN106284481B (en) | 2016-09-08 | 2016-09-08 | Determine varying load sensitivity combining hydraulic system and loading machine |
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| Publication Number | Publication Date |
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| CN106284481A true CN106284481A (en) | 2017-01-04 |
| CN106284481B CN106284481B (en) | 2018-09-18 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107724454A (en) * | 2017-11-10 | 2018-02-23 | 广西柳工机械股份有限公司 | Loading machine determines variable delivery hydraulic system |
| CN109235533A (en) * | 2018-09-13 | 2019-01-18 | 广西柳工机械股份有限公司 | Loading machine hydraulic system of working |
| CN112109801A (en) * | 2020-09-15 | 2020-12-22 | 广西柳工机械股份有限公司 | Steering hydraulic system and loader |
| CN112682373A (en) * | 2020-12-29 | 2021-04-20 | 山推工程机械股份有限公司 | Hydraulic system, control method and engineering vehicle |
| CN113482090A (en) * | 2021-07-27 | 2021-10-08 | 柳州柳工液压件有限公司 | Main control valve, fixed variable hydraulic system and loader |
| CN113915190A (en) * | 2021-10-29 | 2022-01-11 | 上海三一重机股份有限公司 | Quantitative and fixed variable switchable hydraulic system, control method thereof and working machine |
| CN113914408A (en) * | 2021-09-27 | 2022-01-11 | 徐工集团工程机械股份有限公司科技分公司 | Loader constant-variable hydraulic system based on coaxial flow amplification |
| CN116771740A (en) * | 2023-08-18 | 2023-09-19 | 湖南星邦智能装备股份有限公司 | High-position forklift truck, hydraulic control system and method based on single-pump oil supply |
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| CN204849889U (en) * | 2015-05-21 | 2015-12-09 | 徐工集团工程机械股份有限公司科技分公司 | Variable hydraulic system is decided to loader based on flow is enlarged to be turned to |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107724454A (en) * | 2017-11-10 | 2018-02-23 | 广西柳工机械股份有限公司 | Loading machine determines variable delivery hydraulic system |
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| CN112682373A (en) * | 2020-12-29 | 2021-04-20 | 山推工程机械股份有限公司 | Hydraulic system, control method and engineering vehicle |
| CN113482090A (en) * | 2021-07-27 | 2021-10-08 | 柳州柳工液压件有限公司 | Main control valve, fixed variable hydraulic system and loader |
| CN113482090B (en) * | 2021-07-27 | 2023-12-12 | 广西中源机械有限公司 | Main control valve, constant-variable hydraulic system and loader |
| CN113914408A (en) * | 2021-09-27 | 2022-01-11 | 徐工集团工程机械股份有限公司科技分公司 | Loader constant-variable hydraulic system based on coaxial flow amplification |
| CN113914408B (en) * | 2021-09-27 | 2023-02-28 | 徐工集团工程机械股份有限公司科技分公司 | Loader constant-variable hydraulic system based on coaxial flow amplification |
| CN113915190A (en) * | 2021-10-29 | 2022-01-11 | 上海三一重机股份有限公司 | Quantitative and fixed variable switchable hydraulic system, control method thereof and working machine |
| CN113915190B (en) * | 2021-10-29 | 2022-07-05 | 上海三一重机股份有限公司 | Quantitative and fixed variable switchable hydraulic system, control method thereof and working machine |
| CN116771740A (en) * | 2023-08-18 | 2023-09-19 | 湖南星邦智能装备股份有限公司 | High-position forklift truck, hydraulic control system and method based on single-pump oil supply |
| CN116771740B (en) * | 2023-08-18 | 2023-11-07 | 湖南星邦智能装备股份有限公司 | High-position forklift truck, hydraulic control system and method based on single-pump oil supply |
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| CN106284481B (en) | 2018-09-18 |
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