CN106284479B - A kind of flow control system, method and excavator - Google Patents
A kind of flow control system, method and excavator Download PDFInfo
- Publication number
- CN106284479B CN106284479B CN201610677066.3A CN201610677066A CN106284479B CN 106284479 B CN106284479 B CN 106284479B CN 201610677066 A CN201610677066 A CN 201610677066A CN 106284479 B CN106284479 B CN 106284479B
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- oil outlet
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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
-
- 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
- E02F9/2264—Arrangements or adaptations of elements for hydraulic 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
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
Abstract
The embodiment of the invention discloses a kind of flow control system, method and excavator, which includes: control crank, main valve, executing agency, selection shuttle valve, adjuster, main pump and pump variable oil cylinder；Select the oil outlet of the oil inlet connection control crank of shuttle valve, the oil inlet of oil outlet connection adjustor, for transmitting pilot pressure to adjuster according to the output pressure of control crank；The oil outlet of the oil inlet connection control crank of main valve, the oil inlet of oil outlet connection executing agency and adjuster, corresponding actions are executed for controlling executing agency according to the output pressure of control crank, and during executing corresponding actions, to adjuster traffic load pressure；The oil outlet connection pump variable oil cylinder of adjuster, for adjusting the oil outlet pressure of pump variable oil cylinder according to pilot pressure and load pressure, and then adjusts the discharge capacity of main pump.The present invention is based on the discharge capacities that pilot pressure and load pressure adjust main pump, have the advantages that while meeting response quickly, energy conservation.
Description
Technical field
The present invention relates to mechanical equipment control fields, and in particular to a kind of flow control system, method and excavator.
Background technique
The flow control methods of existing excavator hydraulic system include inverted flux control, positive flow control and load-sensitive
Three kinds of control.Positive stream amount control system is directly controlled the discharge capacity of hydraulic pump by handle signal, has response fast, good operability excellent
Point, but under complex job operating condition, oil consumption is higher.Load sensitive control system can adjust in real time pump according to surface state
The shortcomings that discharge capacity reduces system overflow, has preferable fuel economy, but there are low-responses.How excavator liquid is realized
Pressure system has quick response and can improve the problem of fuel economy under complex job operating condition is this field urgent need to resolve.
Summary of the invention
For the defects in the prior art, the present invention provides a kind of flow control system, method and excavators, to solve
Certainly the prior art is difficult to meet the problem of quick response, energy conservation simultaneously.
The embodiment of the present invention proposes a kind of flow control system, comprising: control crank, main valve, executing agency, selection shuttle
Valve, adjuster, main pump and pump variable oil cylinder；
The oil inlet of the selection shuttle valve connects the oil outlet of the control crank, oil outlet connect the adjuster into
Hydraulic fluid port, for transmitting pilot pressure to the adjuster according to the output pressure of the control crank；
The oil inlet of the main valve connects the oil outlet of the control crank, and oil outlet connects the executing agency and described
The oil inlet of adjuster executes corresponding actions for controlling the executing agency according to the output pressure of the control crank, and
During executing corresponding actions, to the adjuster traffic load pressure；
The oil outlet of the adjuster connects the pump variable oil cylinder, for being pressed according to the pilot pressure and the load
Power adjusts the oil outlet pressure of the pump variable oil cylinder, and then adjusts the discharge capacity of the main pump.
Preferably, the adjuster includes pressure maintaining valve, the first regulating valve and the second regulating valve；
The oil inlet of the pressure maintaining valve connects the oil outlet of the selection shuttle valve, and oil outlet connects first regulating valve
Oil inlet；
The oil outlet of first regulating valve connects the oil inlet of second regulating valve；
The oil inlet of second regulating valve connects the oil outlet of the main valve, and oil outlet connects the pump variable oil cylinder.
Preferably, the adjuster further include: power control valve, power control piston and Power control component；
The power control valve is connected between second regulating valve and the pump variable oil cylinder；
One end of the power control valve is connect with the power control piston, and the other end and the Power control component connect
It connects；
The Power control component is separately connected first regulating valve and the pump variable oil cylinder, in the main pump
Discharge capacity when reaching peak power output, according to the output pressure of the power control piston output end, maintain the main pump
Discharge capacity.
Preferably, the power control piston is also used to control the output pressure of the output end according to external control system
Power, to adjust the peak power output of the main pump.
Preferably, the adjuster further include: pressure limiting valve；
The pressure limiting valve is connected between the power control valve and the pump variable oil cylinder, the oil inlet of the pressure limiting valve
The oil outlet for connecting the main pump, for limiting the maximum pressure of the main pump oil outlet.
Preferably, further includes: slippage pump；
The slippage pump is connected between the circuit and control crank between main pump and fuel tank, for by control crank to
The main valve transmits the output pressure.
Preferably, the control crank includes at least one in rotary handle, swing arm handle and scraper bowl/dipper handle；
The main valve include at least revolution main valve, swing arm main valve and with one in scraper bowl/dipper main valve；
Correspondingly, the selection shuttle valve, is also used to obtain maximum pilot pressure according to the output pressure of each handle, and by institute
It states maximum pilot pressure and is transmitted to the adjuster.
The embodiment of the invention also provides a kind of flow control methods to specifically include including flow control system above
Following steps:
When the control crank transmits the output pressure to the main valve, the adjuster receives the selection shuttle valve
The pilot pressure of transmission；
During main valve controls the executing agency according to the output pressure and executes corresponding actions, the adjuster
Receive the load pressure of the main valve transmission；
The adjuster adjusts the oil outlet pressure of the pump variable oil cylinder according to the pilot pressure and the load pressure
Power, to adjust the discharge capacity of the main pump.
Preferably, the adjuster adjusts going out for the pump variable oil cylinder according to the pilot pressure and the load pressure
The step of hydraulic fluid port pressure, specifically includes:
First regulating valve of the adjuster goes out oil pressure tune according to the pilot pressure, in conjunction with the main pump output end
Save the oil outlet pressure of the pump variable oil cylinder；
Second regulating valve of the adjuster goes out oil pressure tune according to the load pressure, in conjunction with the main pump output end
Save the oil outlet pressure of the pump variable oil cylinder.
The embodiment of the present invention also proposed a kind of excavator, including such as above-mentioned flow control system
As shown from the above technical solution, flow control system proposed by the present invention, method and excavator are based on pilot pressure
The discharge capacity that main pump is adjusted with load pressure has simultaneously with the prior art merely using compared with arriving first pressure or load pressure
Meet the advantage of response quickly, energy conservation.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 shows a kind of structural schematic diagram of flow control system of one embodiment of the invention offer；
Fig. 2 shows another embodiment of the present invention provides a kind of flow control system structural schematic diagram；
Fig. 3 shows a kind of structural schematic diagram of flow control system of further embodiment of this invention offer；
The hyperbola that Fig. 4 shows power limit function in a kind of flow control system of one embodiment of the invention offer shows
It is intended to；
Fig. 5 shows a kind of flow diagram of flow control methods of one embodiment of the invention offer.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 shows a kind of structural schematic diagram of flow control system of one embodiment of the invention offer, referring to Fig.1, should
Flow control system includes: fuel tank 1, power unit 2, adjuster 3, executing agency 4, main valve 5, selects shuttle valve 6, control crank 7,
Wherein, power unit 2 includes: main pump 202 and pump variable oil cylinder 201；
The oil inlet of the selection shuttle valve 6 connects the oil outlet of the control crank 7, and oil outlet connects the adjuster 3
Oil inlet, for transmitting pilot pressure to the adjuster 3 according to the output pressure of the control crank 7；
The oil inlet of the main valve 5 connects the oil outlet of the control crank 7, and oil outlet connects 4 He of executing agency
The oil inlet of the adjuster 3 executes accordingly for controlling the executing agency 4 according to the output pressure of the control crank 7
Movement, and during executing corresponding actions, to the 3 traffic load pressure of adjuster；
The oil outlet of the adjuster 3 connects the pump variable oil cylinder 201, for according to the pilot pressure and described bearing
It carries pressure and adjusts the oil outlet pressure of the pump variable oil cylinder 201, and then adjust the discharge capacity of the main pump 202.
Flow control system, method and excavator proposed by the present invention adjust main pump based on pilot pressure and load pressure
Discharge capacity, with the prior art merely using compared with arriving first pressure or load pressure, having while meeting response quickly, energy-efficient excellent
Point.
Fig. 2 shows another embodiment of the present invention provides a kind of flow control system structural schematic diagram, referring to fig. 2,
The adjuster 3 includes pressure maintaining valve 309, the first regulating valve 310 and the second regulating valve 308；
The oil inlet of the pressure maintaining valve 309 connects the oil outlet of the selection shuttle valve 7, and oil outlet connection described first is adjusted
The oil inlet of valve 310；
The oil outlet of first regulating valve 310 connects the oil inlet of second regulating valve 308；
The oil inlet of second regulating valve 308 connects the oil outlet of the main valve 5, and oil outlet connects the pump variable oil
Cylinder 204.
In the present embodiment, the adjuster 3 further include: power control valve 307, power control piston 306 and power control
Component；
The power control valve 307 is connected between second regulating valve 308 and the pump variable oil cylinder 204；
One end of the power control valve 307 is connect with the power control piston 306, the other end and the power control
Component connection；
The Power control component is separately connected first regulating valve 310 and the pump variable oil cylinder 204, in institute
When stating the discharge capacity of main pump 5 and reaching peak power output, according to the output pressure of 306 output end of power control piston, maintain
The discharge capacity of the main pump 5.
In the present embodiment, the power control piston 306 is also used to control the output end according to external control system
Output pressure, to adjust the peak power output of the main pump 5.
In the present embodiment, the adjuster 3 further include: pressure limiting valve 305；
The pressure limiting valve 305 is connected between the power control valve 307 and the pump variable oil cylinder 204, the pressure limiting
The oil inlet of valve 305 connects the oil outlet of the main pump 5, for limiting the maximum pressure of 5 oil outlet of main pump.
In a possible embodiments, the system further include: slippage pump 201；
The slippage pump 201 is connected to the circuit between main pump 5 and fuel tank 1 and between control crank, for passing through manipulation
Handle transmits the output pressure to the main valve 5.
Fig. 3 shows a kind of structural schematic diagram of flow control system of further embodiment of this invention offer, the manipulation
Handle 7 includes at least one in rotary handle 701, swing arm handle 702 and scraper bowl/dipper handle 703；The main valve at least wraps
Include revolution main valve 501, swing arm main valve 502 and with one in scraper bowl/dipper main valve 503；Correspondingly, the selection shuttle valve 6, also
For obtaining maximum pilot pressure according to the output pressure of each handle, and the maximum pilot pressure is transmitted to the adjuster
3。
It is described in detail referring to working principle of the Fig. 3 to this programme:
3.1, as shown in figure 3, the discharge capacity of main pump 202 is controlled by pump variable oil cylinder 204.In the state of the equilibrium, when L lateral pressure
It increases, discharge of main pump increases.When R lateral pressure increases, discharge of main pump reduces.Pump the side L and the main pump outlet phase of variable oil cylinder 204
Even, pressure is identical as main pump outlet pressure.
3.2, pump the pressure of the side R of variable oil cylinder 204 be pump discharge pressure by concatenated first regulating valve 310 of pipeline,
Pressure value after the common adjusting of second regulating valve 308, power control valve 307 and pressure limiting valve 305, above-mentioned valve are both preferably two three
Port valve.Wherein, the first regulating valve 310 generates different opening degrees according to the pressure size of the port r, and then generates different pipes
The pressure of road c.Second regulating valve 308 generates different opening degrees according to the pressure size of the port n and the port m, and then generates
The pressure of different pipeline d.Power control valve 307 generates not according to the power of power control piston 306 and the dynamic balance of sliding block 304
Same opening degree, and then generate the pressure of different pipeline e.Pressure limiting valve 305 is generated according to i mouthfuls of pressure and the dynamic balance of spring
Different opening degrees, and then generate the pressure of different pipeline f.Pipeline f is connected to the side R of pump variable oil cylinder 204.
3.3, the port r pressure of the first regulating valve 310 is generated by pressure maintaining valve 309 according to the pressure of hydraulic control port q.Work as port
The pressure of q is big, and the pressure of port r also increases.When the pressure of port q is small, the pressure of port r also reduces.The port q of the invention,
It is connected to the maximum pilot pipe for selecting shuttle valve 621-623 and second level selection shuttle valve 611-612 to choose by the first order
Road Pi.Therefore work as the opening degree that driver controls corresponding main valve 501-503 by control crank 701-703, further
The movement for controlling corresponding executing agency 401-403, while completing the movement intentionally got, pipeline Pi is also provided with and grasps
The proportional maximum pilot pressure of vertical handle operation amplitude.Because the pressure of pipeline Pi is synchronous with the operation of driver,
As long as pilot control handle, the port r of the first regulating valve 310 has proportional pressure.First regulating valve 310 is transported to the right
Dynamic, the discharge capacity of the pressure reduction of circuit c-d-e-f-R, main pump 202 increases, and generates the flow proportional to control crank.
3.4, the control port n of the second regulating valve 308 is connected to load-sensitive pipeline LS.When LS increase, that is, work
Load increases, and the circulation area of pipeline c and pipeline d increase, the pressure reduction of pipeline d, and pump variable oil cylinder 204R lateral pressure reduces,
The discharge capacity of main pump increases.When LS pressure reduction, load-sensitive two position three-way valve 308 is under the action of pipeline m pressure to moving up
Dynamic, the circulation area of pipeline j and pipeline d increase, the pressure rise of pipeline d, and pump variable oil cylinder 204R lateral pressure increases, main pump
Discharge capacity reduces.The discharge capacity for being achieved in main pump increases with the raising of load-sensitive signal LS, reduces with the reduction of LS.
3.5, power control valve 307 generates different open according to the power of power control piston 306 and the dynamic balance of sliding block 304
Degree of leaving.Sliding block 302 and sliding block 304 can be slided along the surface of lever 303.Lever 303 is rotated around rotation center O, sliding block
302 and sliding block 304 equalising torque relationship are as follows: pp*Ap*L302=F306*L304.Wherein, L302 is that sliding block 302 arrives lever 303
The distance of centre of gyration O, L306 are the distance that sliding block 306 arrives 303 centre of gyration O of lever.F306 is 306 institute of power control piston
The hydraulic pressure of the power of application, mainly spring force and Z1 mouthful and Z2.The output power of pump 202 can be calculated by following formula, by
It is proportional to L302 in the discharge capacity of pump, therefore when F306 is certain certain value, the output power of hydraulic pump is steady state value.
When the pressure of P point, that is, the outlet pressure of pump main 202, the product with discharge of main pump is more than master after a certain numerical value
The discharge capacity of pump 202 reduces automatically, and pressure and discharge capacity are in inverse relation (i.e. hyperbola), is achieved in the invariable power limit of main pump
Function processed.
3.6, the effect of pressure limiting valve 305 is the maximum pressure of limitation system.Pressure at pipeline i arrives greatly a certain numerical value
Afterwards, pressure limiting valve 305 will move up, and pipeline h is communicated with pipeline f.Because pumping the left and right sides pressure phase at this time of variable oil cylinder 204
Deng, and the area of the side R is larger, the discharge capacity of main pump 202 becomes smaller, and the output flow of main pump 202 reduces.Therefore work as the pressure of main pump 202
More than after certain value, the discharge capacity of main pump 202 reduces power automatically, avoids system overflow, realizes energy conservation.
3.7, as noted previously, as the first regulating valve 310, the second regulating valve 308, power control 307 and pressure limiting valve 305
Co- controlling the discharge capacity of main pump 202, and the first regulating valve 310 is directly controlled by pilot pressure signal Pi, the second regulating valve
308 are directly controlled by load-sensitive LS pressure signal, therefore the present invention has quick response and automatically adjusted according to payload size
Pumpage avoids overflow from realizing energy-efficient purpose.
3.8, the first regulating valve 310, the second regulating valve 308, power control port valve 307 and pressure limiting valve 305, pressure maintaining valve 309
It is all integrated on pump control mechanism 3.Pump control mechanism 3 and main pump 202 and its pump variable oil cylinder 204 is connect by fluid pressure line and position
Feedback rod 301 connects.
3.9, the excavator hydraulic system provides power by engine 203, and main pump 202 and slippage pump 201 is driven to rotate.It mends
Oil pump 201 provides low pressure for handle 801-803.Main pump 202 provides main actions power for executing agency 401-403.
In conclusion the present invention has the advantage that
1, the maximum pump discharge of main pump 202 is directly controlled by pilot pressure, has the advantages that response quickly.When driver needs
Quick acting, main pump 202 generate big flow immediately.When driver's needs are slowly affected, main pump 202 reduces main pump row immediately
Amount.The movement of main pump 202 and the movement of driver are synchronous, and driving experience greatly improved.
2, adjusting of the actual displacement of main pump 202 by load-sensitive signal LS, when actual loading is small, 202 row of main pump
Amount can also reduce.When actual loading is big, 202 discharge capacity of main pump also be will increase.The supply of how many main pump 202 is actually needed how much, keeps away
Exempt from overflow, realizes energy conservation.
3, hyperbola power limit function may be implemented in power control port valve 307.Pressure limiting valve 305 limits the maximum pressure of system
Power.They be all by adjusting the discharge capacity of main pump 202, rather than pass through overflow valve realize.Section is realized in the system overflow avoided
Energy.
The hyperbola that Fig. 4 shows power limit function in a kind of flow control system of one embodiment of the invention offer shows
It is intended to, referring to fig. 4 it is found that the system overflow that above-mentioned steps 3.7 can be effectively prevented from, realizes energy conservation.
Fig. 5 shows a kind of flow diagram of flow control methods of one embodiment of the invention offer, should referring to Fig. 5
Flow control methods, which is characterized in that including above-mentioned flow control system, specifically comprise the following steps:
501, when the control crank transmits the output pressure to the main valve, the adjuster receives the selection
The pilot pressure of shuttle valve transmission；
502, during main valve controls the executing agency according to the output pressure and executes corresponding actions, the tune
Section device receives the load pressure of the main valve transmission；
503, the adjuster adjusts the fuel-displaced of the pump variable oil cylinder according to the pilot pressure and the load pressure
Mouth pressure, to adjust the discharge capacity of the main pump.
Flow control methods proposed by the present invention adjust the discharge capacity of main pump based on pilot pressure and load pressure, with existing skill
Use arrives first pressure to art merely or load pressure is compared, and has the advantages that while meeting response quickly, energy conservation.
Step 503 specifically includes:
First regulating valve of the adjuster goes out oil pressure tune according to the pilot pressure, in conjunction with the main pump output end
Save the oil outlet pressure of the pump variable oil cylinder；
Second regulating valve of the adjuster goes out oil pressure tune according to the load pressure, in conjunction with the main pump output end
Save the oil outlet pressure of the pump variable oil cylinder.
For method implementation, for simple description, therefore, it is stated as a series of action combinations, but ability
Field technique personnel should be aware of, and embodiment of the present invention is not limited by the described action sequence, because according to the present invention
Embodiment, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art should also know that,
Embodiment described in this description belongs to preferred embodiment, related movement embodiment party not necessarily of the present invention
Necessary to formula.
Based on same inventive concept, a kind of excavator of the embodiment of the present invention, which is characterized in that including such as claim 1-
7 described in any item flow control systems.
In specification of the invention, numerous specific details are set forth.It is to be appreciated, however, that the embodiment of the present invention can be with
It practices without these specific details.In some instances, well known method, structure and skill is not been shown in detail
Art, so as not to obscure the understanding of this specification.
Similarly, it should be understood that disclose to simplify the present invention and help to understand one or more in each inventive aspect
A, in the above description of the exemplary embodiment of the present invention, each feature of the invention is grouped together into individually sometimes
In embodiment, figure or descriptions thereof.However, should not explain the method for the disclosure is in reflect an intention that be wanted
Ask protection the present invention claims features more more than feature expressly recited in each claim.More precisely, such as
As claims reflect, inventive aspect is all features less than single embodiment disclosed above.Therefore, it abides by
Thus the claims for following specific embodiment are expressly incorporated in the specific embodiment, wherein each claim itself
As a separate embodiment of the present invention.
In the description of the present invention it should be noted that the orientation or positional relationship of the instructions such as term " on ", "lower" is base
In orientation or positional relationship shown in the drawings, it is merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion
Signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to this
The restriction of invention.Unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " should broadly understood, example
Such as, it may be fixed connection or may be dismantle connection, or integral connection；It can be mechanical connection, be also possible to be electrically connected
It connects；It can be directly connected, the connection inside two elements can also be can be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.It is more limit in the case where, the element that is limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case where bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (10)
1. a kind of flow control system characterized by comprising control crank, executing agency, selection shuttle valve, is adjusted main valve
Device, main pump and pump variable oil cylinder；
The oil inlet of the selection shuttle valve connects the oil outlet of the control crank, and oil outlet connects the oil inlet of the adjuster
Mouthful, for transmitting pilot pressure to the adjuster according to the output pressure of the control crank；
The oil inlet of the main valve connects the oil outlet of the control crank, and oil outlet connects the executing agency and the adjusting
The oil inlet of device executes corresponding actions for controlling the executing agency according to the output pressure of the control crank, and is holding
During row corresponding actions, to the adjuster traffic load pressure；
The oil outlet of the adjuster connects the pump variable oil cylinder, for according to the pilot pressure and the load pressure tune
The oil outlet pressure of the pump variable oil cylinder is saved, and then adjusts the discharge capacity of the main pump.
2. system according to claim 1, which is characterized in that the adjuster includes pressure maintaining valve, the first regulating valve and
Two regulating valves；
The oil inlet of the pressure maintaining valve connects the oil outlet of the selection shuttle valve, and oil outlet connects the oil inlet of first regulating valve
Mouthful；
The oil outlet of first regulating valve connects the oil inlet of second regulating valve；
The oil inlet of second regulating valve connects the oil outlet of the main valve, and oil outlet connects the pump variable oil cylinder.
3. system according to claim 2, which is characterized in that the adjuster further include: power control valve, power control
Piston and Power control component；
The power control valve is connected between second regulating valve and the pump variable oil cylinder；
One end of the power control valve is connect with the power control piston, and the other end is connect with the Power control component；
The Power control component is separately connected first regulating valve and the pump variable oil cylinder, for the row in the main pump
When amount reaches peak power output, according to the output pressure of the power control piston output end, the discharge capacity of the main pump is maintained.
4. system according to claim 3, which is characterized in that the power control piston is also used to be controlled according to outside
System controls the output pressure of the output end, to adjust the peak power output of the main pump.
5. system according to claim 3, which is characterized in that the adjuster further include: pressure limiting valve；
The pressure limiting valve is connected between the power control valve and the pump variable oil cylinder, the oil inlet connection of the pressure limiting valve
The oil outlet of the main pump, for limiting the maximum pressure of the main pump oil outlet.
6. system according to claim 1, which is characterized in that further include: slippage pump；
The slippage pump is connected between the circuit and control crank between main pump and fuel tank, for by control crank to described
Main valve transmits the output pressure.
7. system according to claim 1, which is characterized in that the control crank includes at least rotary handle, swing arm hand
One in handle and scraper bowl/dipper handle；
The main valve include at least revolution main valve, swing arm main valve and with one in scraper bowl/dipper main valve；
Correspondingly, the selection shuttle valve is also used to obtain maximum pilot pressure according to the output pressure of each handle, and by described in most
Big pilot pressure is transmitted to the adjuster.
8. a kind of flow control methods, which is characterized in that including the described in any item flow control systems of claim 1-7, tool
Body includes the following steps:
When the control crank transmits the output pressure to the main valve, the adjuster receives the selection shuttle valve transmission
Pilot pressure；
During main valve controls the executing agency according to the output pressure and executes corresponding actions, the adjuster is received
The load pressure of the main valve transmission；
The adjuster adjusts the oil outlet pressure of the pump variable oil cylinder according to the pilot pressure and the load pressure, with
Adjust the discharge capacity of the main pump.
9. according to the method described in claim 8, it is characterized in that, the adjuster is according to the pilot pressure and the load
Pressure adjust it is described pump variable oil cylinder oil outlet pressure the step of specifically include:
First regulating valve of the adjuster adjusts institute according to the pilot pressure, in conjunction with the oil pressure that goes out of the main pump output end
State the oil outlet pressure of pump variable oil cylinder；
Second regulating valve of the adjuster adjusts institute according to the load pressure, in conjunction with the oil pressure that goes out of the main pump output end
State the oil outlet pressure of pump variable oil cylinder.
10. a kind of excavator, which is characterized in that including such as described in any item flow control systems of claim 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610677066.3A CN106284479B (en) | 2016-08-16 | 2016-08-16 | A kind of flow control system, method and excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610677066.3A CN106284479B (en) | 2016-08-16 | 2016-08-16 | A kind of flow control system, method and excavator |
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| Publication Number | Publication Date |
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| CN106284479A CN106284479A (en) | 2017-01-04 |
| CN106284479B true CN106284479B (en) | 2019-02-12 |
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| CN114263541B (en) * | 2021-12-29 | 2022-12-13 | 柳州柳工挖掘机有限公司 | Excavator control method and excavator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296665A (en) * | 2011-06-23 | 2011-12-28 | 上海三一重机有限公司 | Excavator hydraulic system carrying load sensing main valve and positive flow pump |
| CN105156391A (en) * | 2015-09-17 | 2015-12-16 | 徐州工业职业技术学院 | Composite variable pump and hydraulic control system using composite variable pump |
| CN105604996A (en) * | 2016-03-18 | 2016-05-25 | 徐州重型机械有限公司 | Load-sensitive control system, control method and hydraulic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100663696B1 (en) * | 2006-03-21 | 2007-01-02 | (주)수호산업개발 | Oil pressure circuit system to drive rock drilling device in excavator |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296665A (en) * | 2011-06-23 | 2011-12-28 | 上海三一重机有限公司 | Excavator hydraulic system carrying load sensing main valve and positive flow pump |
| CN105156391A (en) * | 2015-09-17 | 2015-12-16 | 徐州工业职业技术学院 | Composite variable pump and hydraulic control system using composite variable pump |
| CN105604996A (en) * | 2016-03-18 | 2016-05-25 | 徐州重型机械有限公司 | Load-sensitive control system, control method and hydraulic system |
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