CN208668506U - A kind of main valve hydraulic circuit and the engineering machinery using the circuit - Google Patents
A kind of main valve hydraulic circuit and the engineering machinery using the circuit Download PDFInfo
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- CN208668506U CN208668506U CN201821006838.1U CN201821006838U CN208668506U CN 208668506 U CN208668506 U CN 208668506U CN 201821006838 U CN201821006838 U CN 201821006838U CN 208668506 U CN208668506 U CN 208668506U
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Abstract
The utility model discloses a kind of main valve hydraulic circuits applied to engineering machinery and a kind of engineering machinery for being provided with the main valve hydraulic circuit to simplify main valve structure, save the cost by modifying the second main pump system.The main valve hydraulic circuit include for controlling straight line walking, left lateral is walked, the first main pump system of the first swing arm, the first scraper bowl and the first dipper movement, and walk for controlling right lateral, the second main pump system that spare, the second swing arm, revolution, the second dipper act.In second main pump system, main valve plug main pump oil liquid at middle position sequentially passes through right lateral and walks spool, spare spool, the second swing arm spool, rotary valve key and the second dipper spool；Rotary valve key is connect by revolution connection Series-parallel oil circuit with the second swing arm spool, and rotary valve key is provided with first segment discharge orifice in the circuit in parallel with the second swing arm spool；Second dipper spool joins Series-parallel oil circuit by dipper and connect with rotary valve key, and the second dipper spool is provided with the second throttle orifice in the circuit in parallel with rotary valve key.
Description
Technical field
The utility model relates to technical field of engineering machinery, in particular to a kind of main valve hydraulic circuit and one kind are provided with
The engineering machinery of the main valve hydraulic circuit.
Background technique
For engineering machinery such as excavator, churning driven etc. mainly using center main valve is opened, " opening center main valve " refers to that main valve plug exists
The oil liquid of main oil sources can pass through main valve with a kind of main valve of relatively low pressure core off-load when middle position.
The layout of such main valve is generally using the scheme collaborated in double pump, valve, and the layout of each work connection is in this type valves
On effect it is very crucial.In the prior art, such main valve function connection is frequently with following layout:
First main pump system: straight line walking=" left lateral walks=" the first swing arm=" the first scraper bowl=" the first dipper；Second
Main pump system: right lateral walks=" revolution=" the second swing arm=" spare=" the second dipper.
In the second main pump system, other each movements are all made of shunt circuit in addition to right lateral is walked.Wherein, " spare " is to excavate
A spare work connection in owner's valve is similar with swing arm revolute function, only usually not necessarily uses, client oneself when needing
It installs and uses.
In the second main pump system, there is obvious deficiency in this side to this layout.By taking excavator as an example, excavator is mentioned doing swing arm
When liter+revolution acts, it is desirable that the speed of boom arm lift is greater than the speed of revolution, this just needs above to increase throttling excessively in back rotation
Realize the preferential of swing arm movement, but if using existing layout, the oil liquid of the second main pump will first pass through revolution and arrive at the again
Two swing arms, if only simple increase throttles when will lead to revolution movement single movement, there are restriction losses, so existing system
A special control valve group is increased in system to solve this problem, but just causes main valve hydraulic loop structure more in this way
Complexity increases cost.
Therefore, how to simplify main valve structure save the cost, be current those skilled in the art technical problem urgently to be resolved.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of main valve hydraulic circuits and one kind to be provided with the main valve
The engineering machinery of hydraulic circuit, using the second main pump system of redesign, while the structure in modification system is matched, most
It can achieve the purpose that simplified main valve structure, save the cost eventually.
To achieve the above object, the utility model provides the following technical solutions:
A kind of main valve hydraulic circuit, including for control straight line walking, left lateral walk, the first swing arm, the first scraper bowl and first
First main pump system of dipper movement, and walk for controlling right lateral, second that spare, the second swing arm, revolution, the second dipper act
Main pump system, in which:
In second main pump system, in predeterminated position, main pump oil liquid sequentially passes through right lateral and walks spool, spare each spool
Spool, the second swing arm spool, rotary valve key and the second dipper spool；
Also,
The rotary valve key is connect by revolution connection Series-parallel oil circuit with the second swing arm spool, wherein the revolution
Spool is provided in the circuit in parallel with the second swing arm spool for realizing preferential first segment discharge orifice；
And/or the second dipper spool joins Series-parallel oil circuit by dipper and connect with the rotary valve key, described second
It is provided in the dipper spool circuit in parallel with the rotary valve key for realizing the second preferential throttle orifice.
Preferably, in above-mentioned main valve hydraulic circuit, the second swing arm spool is two five-way valve spools, in which:
Spool is located at left position, then is used for the first import of main pump oil liquid and main pump oil liquid first across the main pump oil liquid and goes out
Mouth connection, also, swing arm spool second interface and swing arm spool third orifice；
Spool is located at right position, then first import of main pump oil liquid and the main pump oil liquid first outlet are closed, boom valve
Core first interface and the swing arm spool third orifice.
Preferably, in above-mentioned main valve hydraulic circuit, the rotary valve key is three six-way valve spools, in which:
Spool is located at middle position, then is used for the second import of main pump oil liquid and main pump oil liquid second across the main pump oil liquid and goes out
Mouth connection, rotary valve key first interface, rotary valve key second interface, rotary valve key third interface, the 4th rotary valve key interface are equal
It closes；
Spool is located at left position, then second import of main pump oil liquid and the main pump oil liquid second outlet are closed, and described time
Rotary plate first interface and the 4th rotary valve key orifice, the rotary valve key second interface and the rotary valve key
Three orifices；
Spool is located at right position, then second import of main pump oil liquid and the main pump oil liquid second outlet are closed, and described time
Rotary plate first interface and the rotary valve key third orifice, the rotary valve key second interface and the 4th revolving valve
Core orifice；
Also, the revolution connection Series-parallel oil circuit includes:
First oil circuit in parallel, it is described between the swing arm spool first interface and the rotary valve key first interface
The setting of first segment discharge orifice is in the described first oil circuit in parallel；
First series connection oil circuit, between the main pump oil liquid first outlet and the rotary valve key first interface.
Preferably, in above-mentioned main valve hydraulic circuit, the first check valve is provided in the described first oil circuit in parallel, it is described dynamic
Arm spool first interface is connected to rotary valve key first interface direction, reversed to close.
Preferably, in above-mentioned main valve hydraulic circuit, second one-way valve, the master are provided in the first series connection oil circuit
Pump oil liquid first outlet is connected to rotary valve key first interface direction, reversed to close.
Preferably, in above-mentioned main valve hydraulic circuit, the second dipper spool is three six-way valve spools, in which:
Spool is located at middle position, then is used for main pump oil liquid third import and main pump oil liquid third across the main pump oil liquid and goes out
Mouth connection, dipper spool first interface, dipper spool second interface, dipper spool third interface, the 4th interface of dipper spool are equal
It closes；
Spool is located at left position, then the main pump oil liquid third import and main pump oil liquid third outlet are closed, the bucket
Stem valve core first interface and the dipper spool third orifice, the dipper spool second interface and the dipper spool
Four orifices；
Spool is located at right position, then the main pump oil liquid third import and main pump oil liquid third outlet are closed, the bucket
Stem valve core first interface and the 4th orifice of dipper spool, the dipper spool second interface and the dipper spool
Three orifices；
Also, the dipper connection Series-parallel oil circuit includes:
Second shunt circuit, it is described between the swing arm spool first interface and the dipper spool first interface
Second throttle orifice is arranged in second shunt circuit；
Second series loop, between second import of main pump oil liquid and the dipper spool first interface.
Preferably, in above-mentioned main valve hydraulic circuit, third check valve is provided in second shunt circuit, it is described dynamic
Arm spool first interface is connected to the dipper spool first interface direction, reversed to close.
Preferably, in above-mentioned main valve hydraulic circuit, the 4th check valve, the master are provided in second series loop
The second import of pump oil liquid is connected to the dipper spool first interface direction, reversed to close.
Preferably, in above-mentioned main valve hydraulic circuit, it is three six-way valve spools that the right lateral, which walks spool,；
And/or the spare spool is three six-way valve spools.
A kind of engineering machinery is provided with main valve hydraulic circuit as described above.
It can be seen from the above technical proposal that main valve hydraulic circuit provided by the utility model and being provided with the main valve liquid
It pushes back in the engineering machinery on road, has modified the sequence for the connection that respectively works in the second main pump system, and: it deletes setting in former circuit and exists
The revolution pressure-gradient control valve that revolution acts and the dipper pressure-gradient control valve being arranged in dipper circuit upstream；The second main pump system is modified to return
Revolution and the second dipper in road are series-parallel circuit, and acted by way of simple throttle orifice in revolution movement and dipper
It is realized on shunt circuit preferential.It is finally reached the purpose of simplified main valve structure, save the cost.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the hydraulic schematic diagram of main valve hydraulic circuit provided by the embodiment of the utility model.
Wherein:
1- main pump, 2- right lateral walk spool, the spare spool of 3-, 4- the second swing arm spool,
5- revolution connection Series-parallel oil circuit, 6- revolution connection throttle orifice in parallel, 7- rotary valve key,
8- dipper joins Series-parallel oil circuit, and 9- dipper joins throttle orifice in parallel, 10- the second dipper spool；
41- swing arm spool first interface, 42- swing arm spool second interface, 43- swing arm spool third interface,
The first import of oil liquid of 44- main pump, 45- main pump oil liquid first outlet；
71- rotary valve key first interface, 72- rotary valve key second interface, 73- rotary valve key third interface,
The 4th rotary valve key interface of 74-, the second import of oil liquid of 75- main pump, 76- main pump oil liquid second outlet；
101- dipper spool first interface, 102- dipper spool second interface, 103- dipper spool third interface,
The 4th interface of 104- dipper spool, 105- main pump oil liquid third import, the outlet of 106- main pump oil liquid third.
Specific embodiment
The utility model discloses a kind of main valve hydraulic circuit and a kind of engineering machines for being provided with the main valve hydraulic circuit
Tool, using the second main pump system of redesign, while the structure in modification system is matched, can finally reach simplified master
The purpose of valve arrangement, save the cost.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, Fig. 1 is the hydraulic schematic diagram of main valve hydraulic circuit provided by the embodiment of the utility model.
Main valve hydraulic circuit provided by the embodiment of the utility model, including for controlling straight line walking, left lateral is walked, first dynamic
The first main pump system (in Fig. 1 left side oil circuit) of arm, the first scraper bowl and the movement of the first dipper, and walk for controlling right lateral, is spare,
The second main pump system (right side oil circuit in Fig. 1) that second swing arm, revolution, the second dipper act.
Wherein, in the second main pump system, in predeterminated position, the oil liquid of main pump 1 sequentially passes through right lateral and walks spool each spool
2, spare spool 3, the second swing arm spool 4, rotary valve key 7 and the second dipper spool 10.That is the layout of the second main pump system are as follows: right
Walking=" spare=" the second swing arm=" revolution=" the second dipper.(above-mentioned " predeterminated position " refers to: at the second swing arm spool 4
In left position, right lateral walks spool 2, spare spool 3, rotary valve key 7 and the second dipper spool 10 and is in middle position.)
Also, rotary valve key 7 is connect by " revolution connection Series-parallel oil circuit 5 " with the second swing arm spool 4, wherein revolving valve
Core 7 is provided in the circuit in parallel with the second swing arm spool 4 for realizing preferential first segment discharge orifice 6；Second dipper spool 10
It is connect by " dipper joins Series-parallel oil circuit 8 " with rotary valve key 7, in the second dipper spool 10 circuit in parallel with rotary valve key 7
It is provided with for realizing the second preferential throttle orifice 9.
As it can be seen that first passing through the second swing arm using revolution, the second swing arm in the second main pump system of the main valve hydraulic circuit
Movement realized by the first segment discharge orifice 6 of simple structure to the preferential of revolution.Revolution movement passes through the second section of simple structure
Discharge orifice 9 is realized to the preferential of the second dipper.So deleting the special control valve group in former circuit, i.e., setting is in revolution movement
Revolution pressure-gradient control valve and the dipper pressure-gradient control valve that is arranged in dipper circuit upstream.
Wherein, first segment discharge orifice 6 and the second throttle orifice 9 are a simple aperture respectively, without other structures, and it is existing
The special control valve group (i.e. pressure-gradient control valve) that technology uses includes main, pilot stage, and there be spool, valve body, spring etc. many zero in inside
Component, required precision is high, and structure is more complicated than throttle orifice very much, higher cost.
Using excavator swing arm promotion+back rotation as example, using main valve hydraulic circuit provided by the embodiment of the utility model
When, in the second main pump system, the oil liquid of main pump 1 is preferentially entered in the second swing arm spool 4；Moreover, because the parallel connection in revolution is returned
First segment discharge orifice 6 is equipped in road, so oil liquid can preferentially enter in the second swing arm spool 4.If revolution movement is individually operated,
Oil liquid in main pump 1 is entered by the series connection oil circuit in revolution connection Series-parallel oil circuit 5, without in revolution connection Series-parallel oil circuit 5
Oil circuit in parallel in first segment discharge orifice 6, so as to avoid energy loss.It is relatively former in this way while not interfering with function
There is main valve hydraulic circuit to reduce special control valve group (pressure-gradient control valve), so that save the cost simplifies structure.
Similar therewith, the second dipper in the second main pump system also uses identical circuit design, " the second dipper+
Identical priority function also may be implemented when acting in revolution " or " the second dipper+swing arm ".
It can be seen from the above technical proposal that the second main pump system of main valve hydraulic circuit provided by the embodiment of the utility model
In system, the sequence of each work connection is had modified, and: it deletes the revolution pressure-gradient control valve being arranged in revolution movement in former circuit and sets
Set the dipper pressure-gradient control valve in dipper circuit upstream；It is series-parallel for modifying revolution in the second main pump system circuit and the second dipper
Circuit, and by way of simple throttle orifice (first segment discharge orifice 6 and the second throttle orifice 9) revolution movement and dipper act and
Join and is realized preferentially on circuit.
As it can be seen that in main valve hydraulic circuit provided by the embodiment of the utility model, using the second main pump system of redesign,
Structure simultaneously in modification system is matched, is finally reached the purpose of simplified main valve structure save the cost.
In a particular embodiment, the second swing arm spool 4 is two five-way valve spools, and interface includes: for across main pump
The main pump oil liquid import 44 of oil liquid and main pump oil liquid outlet 45, further include that swing arm spool first interface 41, swing arm spool second connect
Mouth 42, swing arm spool third interface 43.
Wherein:
Spool is located at left position, then the first import of main pump oil liquid 44 is connected to main pump oil liquid first outlet 45, swing arm spool
Two interfaces 42 are connected to swing arm spool third interface 43；
Spool is located at right position, then the first import of main pump oil liquid 44 and main pump oil liquid first outlet 45 are closed, swing arm spool the
One interface 41 is connected to swing arm spool third interface 43.
In a particular embodiment, rotary valve key 7 is three six-way valve spools, and interface includes: for across main pump oil liquid
The second import of main pump oil liquid 75 and main pump oil liquid second outlet 76 and rotary valve key first interface 71, rotary valve key second
Interface 72, rotary valve key third interface 73, the 4th rotary valve key interface 74.
Wherein:
Spool is located at middle position, then the second import of main pump oil liquid 75 is connected to main pump oil liquid second outlet 76, rotary valve key
One interface 71, rotary valve key second interface 72, rotary valve key third interface 73, the 4th rotary valve key interface 74 are turned off；
Spool is located at left position, then the second import of main pump oil liquid 75 and main pump oil liquid second outlet 76 are closed, rotary valve key the
One interface 71 is connected to the 4th rotary valve key interface 74, and rotary valve key second interface 72 is connected to rotary valve key third interface 73；
Spool is located at right position, then the second import of main pump oil liquid 75 and main pump oil liquid second outlet 76 are closed, rotary valve key the
One interface 71 is connected to rotary valve key third interface 73, and rotary valve key second interface 72 is connected to the 4th rotary valve key interface 74.
Also, revolution connection Series-parallel oil circuit 5 includes:
First oil circuit in parallel, between swing arm spool first interface 41 and rotary valve key first interface 71, first throttle
The setting of hole 6 is in the first oil circuit in parallel；
First series connection oil circuit, the main pump oil liquid first outlet 45 on the second swing arm spool 4 connect with rotary valve key first
Between mouth 71.
Further, it is provided with the first check valve in the first oil circuit in parallel, swing arm spool first interface 41 arrives rotary valve key
The conducting of 71 direction of first interface, it is reversed to close；Second one-way valve is provided in first series connection oil circuit, on the second swing arm spool 4
Main pump oil liquid first outlet 45 is connected to 71 direction of rotary valve key first interface, reversed to close.
In a particular embodiment, the second dipper spool 10 is three six-way valve spools, and interface includes: for across main pump
The main pump oil liquid third import 105 of oil liquid and main pump oil liquid third outlet 106 and dipper spool first interface 101, bucket rod valve
Core second interface 102, dipper spool third interface 103, the 4th interface 104 of dipper spool.
Wherein:
Spool is located at middle position, then main pump oil liquid third import 105 is connected to main pump oil liquid third outlet 106, dipper spool
First interface 101, dipper spool second interface 102, dipper spool third interface 103, the 4th interface 104 of dipper spool close
It closes；
Spool is located at left position, then main pump oil liquid third import 105 and main pump oil liquid third outlet 106 are closed, dipper spool
First interface 101 is connected to dipper spool third interface 103, the 4th interface 104 of dipper spool second interface 102 and dipper spool
Connection；
Spool is located at right position, then main pump oil liquid third import 105 and main pump oil liquid third outlet 106 are closed, dipper spool
First interface 101 is connected to the 4th interface 104 of dipper spool, dipper spool second interface 102 and dipper spool third interface 103
Connection.
Also, dipper connection Series-parallel oil circuit 8 includes:
Second shunt circuit, between swing arm spool first interface 41 and dipper spool first interface 101, the second throttling
Hole 9 is arranged in the second shunt circuit；
Second series loop, between the second import of main pump oil liquid 75 and dipper spool first interface 101.
Further, third check valve is provided in the second shunt circuit, swing arm spool first interface 41 arrives dipper spool
The conducting of 101 direction of first interface, it is reversed to close；The 4th check valve, the second import of main pump oil liquid are provided in second series loop
75 are connected to 101 direction of dipper spool first interface, reversed to close.
In a particular embodiment, right lateral walks spool 2 and spare spool 3 is respectively three six-way valve spools, specifically as shown in figure 1
It is shown.
In addition, the utility model additionally provides a kind of engineering machinery, which is provided with master as described above
Valve system.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (10)
1. a kind of main valve hydraulic circuit, which is characterized in that including walking for controlling straight line, left lateral is walked, the first swing arm, the first shovel
First main pump system of bucket and the movement of the first dipper, and walk for controlling right lateral, spare, the second swing arm, revolution, the second dipper move
The second main pump system made, in which:
In second main pump system, in predeterminated position, main pump oil liquid sequentially passes through right lateral and walks spool (2), spare each spool
Spool (3), the second swing arm spool (4), rotary valve key (7) and the second dipper spool (10)；
Also,
The rotary valve key (7) is connect by revolution connection Series-parallel oil circuit (5) with the second swing arm spool (4), wherein described
Rotary valve key (7) is provided in the circuit in parallel with the second swing arm spool (4) for realizing preferential first segment discharge orifice
(6)；
And/or the second dipper spool (10) is connect by dipper connection Series-parallel oil circuit (8) with the rotary valve key (7), institute
It states and is provided in the second dipper spool (10) circuit in parallel with the rotary valve key (7) for realizing the second preferential throttle orifice
(9)。
2. main valve hydraulic circuit according to claim 1, which is characterized in that the second swing arm spool (4) is two five
Port valve spool, in which:
Spool is located at left position, then is used for the first import of main pump oil liquid (44) and main pump oil liquid first across the main pump oil liquid and goes out
Mouth (45) connection, also, swing arm spool second interface (42) is connected to swing arm spool third interface (43)；
Spool is located at right position, then first import of main pump oil liquid (44) and the main pump oil liquid first outlet (45) are closed, and moves
Arm spool first interface (41) is connected to the swing arm spool third interface (43).
3. main valve hydraulic circuit according to claim 2, which is characterized in that the rotary valve key (7) is three six-way valves
Spool, in which:
Spool is located at middle position, then is used for the second import of main pump oil liquid (75) and main pump oil liquid second across the main pump oil liquid and goes out
Mouthful (76) connection, rotary valve key first interface (71), rotary valve key second interface (72), rotary valve key third interface (73), the
Four rotary valve key interfaces (74) are turned off；
Spool is located at left position, then second import of main pump oil liquid (75) and the main pump oil liquid second outlet (76) are closed, institute
It states rotary valve key first interface (71) to be connected to the 4th rotary valve key interface (74), the rotary valve key second interface (72)
It is connected to the rotary valve key third interface (73)；
Spool is located at right position, then second import of main pump oil liquid (75) and the main pump oil liquid second outlet (76) are closed, institute
It states rotary valve key first interface (71) to be connected to the rotary valve key third interface (73), the rotary valve key second interface (72)
It is connected to the 4th rotary valve key interface (74)；
Also, revolution connection Series-parallel oil circuit (5) includes:
First oil circuit in parallel, between the swing arm spool first interface (41) and the rotary valve key first interface (71),
First segment discharge orifice (6) setting is in the described first oil circuit in parallel；
First series connection oil circuit, between the main pump oil liquid first outlet (45) and the rotary valve key first interface (71).
4. main valve hydraulic circuit according to claim 3, which is characterized in that be provided with first in the described first oil circuit in parallel
Check valve, the swing arm spool first interface (41) to rotary valve key first interface (71) direction are connected, reversed to close.
5. main valve hydraulic circuit according to claim 3, which is characterized in that be provided with second in the first series connection oil circuit
Check valve, the main pump oil liquid first outlet (45) to rotary valve key first interface (71) direction are connected, reversed to close.
6. main valve hydraulic circuit according to claim 3, which is characterized in that the second dipper spool (10) is three six
Port valve spool, in which:
Spool is located at middle position, then for the main pump oil liquid third import (105) and main pump oil liquid third across the main pump oil liquid
Export (106) connection, dipper spool first interface (101), dipper spool second interface (102), dipper spool third interface
(103), the 4th interface (104) of dipper spool is turned off；
Spool is located at left position, then the main pump oil liquid third import (105) and main pump oil liquid third outlet (106) are closed,
The dipper spool first interface (101) is connected to the dipper spool third interface (103), the dipper spool second interface
(102) it is connected to the 4th interface (104) of dipper spool；
Spool is located at right position, then the main pump oil liquid third import (105) and main pump oil liquid third outlet (106) are closed,
The dipper spool first interface (101) is connected to the 4th interface (104) of dipper spool, the dipper spool second interface
(102) it is connected to the dipper spool third interface (103)；
Also, dipper connection Series-parallel oil circuit (8) includes:
Second shunt circuit, between the swing arm spool first interface (41) and the dipper spool first interface (101),
Second throttle orifice (9) is arranged in second shunt circuit；
Second series loop, between second import of main pump oil liquid (75) and the dipper spool first interface (101).
7. main valve hydraulic circuit according to claim 6, which is characterized in that be provided with third in second shunt circuit
Check valve, the swing arm spool first interface (41) to the dipper spool first interface (101) direction are connected, reversed to close.
8. main valve hydraulic circuit according to claim 6, which is characterized in that be provided with the 4th in second series loop
Check valve, second import of main pump oil liquid (75) to the dipper spool first interface (101) direction are connected, reversed to close.
9. main valve hydraulic circuit according to any one of claims 1 to 8, which is characterized in that the right lateral walks spool (2) and is
Three six-way valve spools；
And/or the spare spool (3) is three six-way valve spools.
10. a kind of engineering machinery, which is characterized in that be arranged just like the described in any item main valve hydraulic circuits of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821006838.1U CN208668506U (en) | 2018-06-27 | 2018-06-27 | A kind of main valve hydraulic circuit and the engineering machinery using the circuit |
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| CN201821006838.1U CN208668506U (en) | 2018-06-27 | 2018-06-27 | A kind of main valve hydraulic circuit and the engineering machinery using the circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022057550A1 (en) * | 2020-09-18 | 2022-03-24 | 江苏徐工工程机械研究院有限公司 | Positive-flow get-on and get-off composite stability control system and method |
| CN114294289A (en) * | 2021-12-31 | 2022-04-08 | 潍柴动力股份有限公司 | Hydraulic main valve system and engineering machinery |
-
2018
- 2018-06-27 CN CN201821006838.1U patent/CN208668506U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022057550A1 (en) * | 2020-09-18 | 2022-03-24 | 江苏徐工工程机械研究院有限公司 | Positive-flow get-on and get-off composite stability control system and method |
| CN114294289A (en) * | 2021-12-31 | 2022-04-08 | 潍柴动力股份有限公司 | Hydraulic main valve system and engineering machinery |
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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai Hydraulic Transmission Co.,Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd. |