CN208907420U - Fixed, variable dual-pump combining hydraulic system and the Work machine including the hydraulic system - Google Patents
Fixed, variable dual-pump combining hydraulic system and the Work machine including the hydraulic system Download PDFInfo
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- CN208907420U CN208907420U CN201821746904.9U CN201821746904U CN208907420U CN 208907420 U CN208907420 U CN 208907420U CN 201821746904 U CN201821746904 U CN 201821746904U CN 208907420 U CN208907420 U CN 208907420U
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Abstract
The utility model relates to fixed, variable dual-pump combining hydraulic systems, comprising: turn to circuit；Performance loop；For the paced work pump to performance loop supply hydraulic fluid；For the variable steering pump to steering circuit supply hydraulic fluid；Collaborate control loop, it includes pressure-gradient control valve, pressure-gradient control valve is configured to collaborate the hydraulic fluid priority of supply that variable steering pump provides to the hydraulic fluid that at least part for the hydraulic fluid for turning to circuit, and variable steering pump capable of being made to provide is provided with paced work pump and the hydraulic fluid at interflow is supplied to performance loop；Collaborating control loop further includes flow control valve, is arranged between pressure-gradient control valve and performance loop, and different opening ratios can be realized under the control of pilot pressure signal.By the hydraulic system, it can be realized fixed, variable dual-pump interflow, improve operating efficiency, and make variable steering pump output displacement according to demand, realize energy-efficient purpose.The utility model further relate to include the hydraulic system Work machine.
Description
Technical field
The utility model relates generally to a kind of hydraulic system, relates more specifically to a kind of realize fixed, variable dual-pump interflow
Hydraulic system and Work machine including the hydraulic system.
Background technique
Fixed, variable dual-pump combining hydraulic system has more and more been applied in loading machine and other engineering machinery.
When operating, the extra flow of steering hydraulic system is provided to hydraulic system of working, thus improves operating efficiency.
Fixed, variable dual-pump can be realized interflow, be realized by dedicated interflow control valve block.
At work, the logical valve in interflow control valve block fully opens current fixed, variable dual-pump combining hydraulic system,
No matter work speed, and variable steering pump can all be in maximum displacement condition, and function is identical as constant displacement pump, cannot achieve energy conservation
Purpose.
The utility model is intended to overcome the problems, such as the above-mentioned one or more and/or prior art other problems.
Summary of the invention
In an aspect, the utility model relates to one kind to determine, variable dual-pump combining hydraulic system, comprising:
Turn to circuit；
Performance loop；
For the paced work pump to performance loop supply hydraulic fluid；
For the variable steering pump to steering circuit supply hydraulic fluid；
Collaborate control loop, the interflow control loop includes:
-- pressure-gradient control valve, the pressure-gradient control valve are configured to the hydraulic fluid priority of supply that will be provided by variable steering pump and extremely turn to back
Road, and at least part of the hydraulic fluid provided by variable steering pump and the flow of pressurized by paced work pump offer can be provided
Body collaborates and the hydraulic fluid at interflow is supplied to performance loop；
Wherein, the interflow control loop further includes flow control valve, and the flow control valve is arranged in the pressure-gradient control valve
Between performance loop, and it is constructed to be permeable to realize different opening ratios under the control of pilot pressure signal.
By the hydraulic system, fixed, variable dual-pump interflow can be realized, improve the reliability of operating efficiency and pump, and
And reduce cost.
Advantageously, which further includes pilot control circuit, and the pilot control circuit is on the one hand to performance loop
On the other hand output pressure signal exports the pilot pressure letter to the flow control valve to control the work of performance loop
Number.In this way, can be realized the different opening of flow control valve according to the difference of the pressure signal size of pilot control circuit transmission
Ratio, to achieve the purpose that export different flow.
Advantageously, interflow control loop further includes shuttle valve, the first input port of the shuttle valve and the flow control valve
Oil outlet fluidly connect, for the second input port for receiving the load signal for coming low damage circuit, output port is used for will be defeated
Signal is transmitted to the variable steering pump out, to control the output of variable steering pump.
Advantageously, pilot control circuit includes shuttle valve component and for the pilot valves to performance loop output pressure signal
Part, two input ports of each shuttle valve in shuttle valve component respectively to two work of the corresponding pilot valve in pilot valve component
Hydraulic fluid port fluidly connects, and the output port of each shuttle valve in shuttle valve component is fluidly connected with flow control valve.It is possible thereby to protect
Performance loop is demonstrate,proved when any movement occurs, corresponding pressure signal can be exported to flow control valve.
In an advantageous embodiment, shuttle valve component includes the first shuttle valve, the second shuttle valve and third shuttle valve, the guide
Valve module includes the first pilot valve, the second pilot valve and third pilot valve, and two input ports of the first shuttle valve are respectively with first
Two actuator ports of pilot valve fluidly connect, and two input ports of the second shuttle valve work with two of the second pilot valve respectively
Hydraulic fluid port fluidly connects, and two input ports of third shuttle valve are fluidly connected with two actuator ports of third pilot valve respectively, the
One, the output port of second, third shuttle valve is fluidly connected with the flow control valve.
Advantageously, pressure-gradient control valve is threeway proportioning valve, and oil inlet is fluidly connected with variable steering pump, the first oil outlet with turn
It is connected to loop fluid, the oil inlet of the second oil outlet and flow control valve fluidly connects.
Advantageously, interflow control loop further includes check valve, and the second of the oil inlet of the check valve and pressure-gradient control valve is fuel-displaced
Mouth fluidly connects, and the oil outlet of the check valve and the oil inlet of flow control valve fluidly connect.In this way, only allowing hydraulic fluid
Flow control valve is flowed to from pressure-gradient control valve, without allowing reverse flow.
Advantageously, flow control valve is two-way proportioning valve, and the oil outlet of oil inlet and the check valve fluidly connects,
Oil outlet is fluidly connected with performance loop.
In another aspect, the utility model relates to a kind of Work machines including the hydraulic system, such as load
Machine.
Detailed description of the invention
The utility model is more fully described below with reference to schematical attached drawing.Attached drawing and corresponding embodiment be only for
The purpose of explanation, rather than limits the present invention.In the accompanying drawings:
Fig. 1 is the diagrammatic view in principle of the fixed of one embodiment according to the present utility model, variable dual-pump combining hydraulic system
Figure, and
Fig. 2 is the enlarged view for collaborating control loop used in the hydraulic system of Fig. 1.
Specific embodiment
Fig. 1 schematically shows fixed, variable dual-pump combining hydraulic system 10 one embodiment according to the present utility model,
The hydraulic system 10 includes paced work pump 1, variable steering pump 2, performance loop 5, turns to circuit 6 and hydraulic oil container 7, quantitative
Working barrel 1 is used to extract hydraulic fluid from hydraulic oil container 7 and hydraulic fluid is delivered to performance loop 5, and variable steering pump 2 is used for
It extracts hydraulic fluid from hydraulic oil container 7 and is delivered to hydraulic fluid and turn to circuit 6.
Hydraulic system 10 further includes interflow control loop 3.The interflow control loop 3 is shown with enlarged view in Fig. 2.?
In embodiment as shown in the figure, interflow control loop 3 includes pressure-gradient control valve 31, flow control valve 32, shuttle valve 33 and check valve 34.
Pressure-gradient control valve 31 is configured to the hydraulic fluid priority of supply that will be provided by variable steering pump 2 and extremely turns to circuit 6, and energy
At least part of the hydraulic fluid provided by variable steering pump 2 is provided with the hydraulic fluid provided by paced work pump 1
And the hydraulic fluid at interflow is supplied to performance loop 5.Fig. 1 and Fig. 2 shows embodiment in, pressure-gradient control valve 31 is threeway ratio
Valve, oil inlet are fluidly connected with variable steering pump 2, the first oil outlet with turn to circuit 6 fluidly connect, the second oil outlet via
Check valve 34 and flow control valve 32 are fluidly connected with performance loop 5.It is understood that pressure-gradient control valve 31 also can be configured to it
The valve of his type, as long as it can be realized function recited above.
The oil inlet of check valve 34 and the second oil outlet of pressure-gradient control valve 31 fluidly connect, the oil outlet and flow of check valve 34
The oil inlet of control valve 32 fluidly connects.Check valve 34 only allows hydraulic fluid to flow to flow control valve 32 from pressure-gradient control valve 31, and
Do not allow reverse flow.
Flow control valve 32 is arranged between pressure-gradient control valve 31 and performance loop 5, is constructed to be permeable in pilot pressure signal
Control under realize different opening ratios, so that the hydraulic fluid of different flow be made to pass through flow control valve 32.In Fig. 1 and figure
In embodiment shown in 2, flow control valve 32 is two-way proportioning valve, and the oil outlet of oil inlet and check valve 34 fluidly connects,
Its oil outlet is fluidly connected with performance loop 5.
Shuttle valve 33 is used to receive the load signal for coming low damage circuit 6 and the load signal from performance loop 5, and will
It is wherein one of larger to be transmitted to variable steering pump 2, to control the output of variable steering pump 2.As shown in Figure 1, shuttle valve 33
First input port and the oil outlet of flow control valve 32 fluidly connect, and the second input port comes low damage circuit 6 for receiving
Load signal, output port be used for by output signal be transmitted to steering variable pump 2, to control the output of variable steering pump 2.
As shown in Figure 1, hydraulic system 10 further includes pilot control circuit 4.As described above, flow control valve 32 is constructed to be permeable to
It is enough that different opening ratios are realized under the control of pilot pressure signal.The pilot pressure signal can be by pilot control circuit 4
It provides.Pilot control circuit 4 is configured on the one hand control the work of performance loop 5 to 5 output pressure signal of performance loop, separately
On the one hand the pilot pressure signal is exported to flow control valve 32, to control the opening ratios of the flow control valve.For example,
One of maximum in the pressure signal exported to performance loop 5 can be transmitted to flow control valve 32 and made by pilot control circuit 4
For the pilot pressure signal of the opening ratios of control flow control valve.
Advantageously, pilot control circuit 4 may include shuttle valve component and for the elder generation to 5 output pressure signal of performance loop
Guide valve component.The pilot valve component in pilot control circuit 4 may include one, two, three or more pilot valves.Accordingly
Ground, the shuttle valve component in pilot control circuit 4 may include one, two, three or more shuttle valves.In the shuttle valve component
Two input ports of each shuttle valve are fluidly connected to two actuator ports of the corresponding pilot valve in the pilot valve component respectively,
The output port of each shuttle valve in the shuttle valve component is fluidly connected with flow control valve 32.It, can be with by pilot control circuit 4
When guaranteeing that any movement of performance loop occurs, corresponding pressure signal can be exported to flow control valve 32, to change flow
The opening ratios of control valve 32.
In the embodiment shown in fig. 1, the shuttle valve component in pilot control circuit 4 includes the first shuttle valve, the second shuttle valve and the
Three shuttle valves, the pilot valve component in pilot control circuit 4 include the first pilot valve, the second pilot valve and third pilot valve, the first shuttle
Two input ports of valve are fluidly connected with two actuator ports of the first pilot valve respectively, two input ports of the second shuttle valve
Fluidly connected respectively with two actuator ports of the second pilot valve, two input ports of third shuttle valve respectively with third pilot valve
Two actuator ports fluidly connect, the output port of the first, second, third shuttle valve is fluidly connected with flow control valve 32.
In the embodiment shown in fig. 1, pilot control circuit 4 uses shuttle valve structure.It is understood that pilot control returns
Road 4 can also use any other structure appropriate, as long as it can be realized function recited above.For example, guide is controlled
Circuit 4 processed can also use one-way valve structures, wherein the first actuator port of the oil inlet of the first check valve and corresponding pilot valve
It fluidly connects, the oil inlet of second one-way valve and the second actuator port of corresponding pilot valve fluidly connect, the first check valve and
The oil outlet of two check valves is fluidly connected with flow control valve 32.
By collaborating, control loop 3 can be realized paced work pump 1 to the hydraulic system 10 of the utility model and variable turns to
The interflow of pump 2, wherein pressure-gradient control valve 31 is preferentially supplied in the hydraulic fluid that guarantee is provided by variable steering pump 2 turns to circuit 6
While, extra hydraulic fluid can be supplied to performance loop 5, interflow is realized, effectively improve operating efficiency, simultaneously
The discharge capacity for reducing paced work pump 1 reduces costs to improve the reliability of pump.In addition, passing through pilot control circuit
4, can the demand according to performance loop 5 to flow of hydraulic fluid different size of pilot pressure signal is transmitted to flow control
Valve 32 controls the opening ratios of flow control valve 32, and then changes the output displacement of variable steering pump 2 by shuttle valve 33, so that
Demand of the variable steering pump 2 according to hydraulic system of working to flow exports corresponding discharge capacity, realizes energy-efficient purpose.
Industrial feasibility
Hydraulic system according to the present utility model 10 is particularly suitable for loading machine.But hydraulic system 10 can also be used for it
In its engineering machinery.The various working conditions of hydraulic system 10 are described in detail by taking loading machine as an example below.
When loading machine only turns to, the load pressure signal for turning to circuit 6 is transmitted by the shuttle valve 33 of interflow control loop 3
To variable steering pump 2, the hydraulic fluid that variable steering pump 2 provides on demand is supplied to by the pressure-gradient control valve 31 of interflow control loop 3
To steering circuit 6.
When loading machine only works, paced work pump 1 supplies hydraulic fluid to performance loop 5.Meanwhile pilot control circuit
Pilot pressure signal is passed to flow control valve 32, the shuttle that the flow signal of flow control valve 32 passes through interflow control loop 3 by 4
Valve 33 passes to variable steering pump 2.Variable steering pump 2 provides required flow according to pressure signal.The flow passes through interflow control
Circuit 3 processed provides hydraulic fluid to performance loop 5, realizes interflow.
When loading machine is not only turned to but also is worked, what the guarantee of pressure-gradient control valve 31 of interflow control loop 3 was provided by variable steering pump 2
Hydraulic fluid, which preferentially supplies, turns to circuit 6, and extra hydraulic fluid is supplied to performance loop 5, realizes interflow.
The fixed of the utility model, variable dual-pump combining hydraulic system are described by specific embodiment above.It is right
It is readily apparent that it can be in the case where not departing from the invention thought of the utility model to this reality for those skilled in the art
A variety of change and modification are made with novel hydraulic system.The reality of the considerations of in conjunction with to specification and disclosed hydraulic system
It tramples, other embodiments will be apparent to those skilled in the art.Specification and example are considered only as exemplary
, real range is indicated by appended claims and their equivalent program.
Claims (10)
1. one kind is fixed, variable dual-pump combining hydraulic system (10), comprising:
It turns to circuit (6)；
Performance loop (5)；
For pumping (1) to the paced work of performance loop supply hydraulic fluid；
For the variable steering pump (2) to steering circuit supply hydraulic fluid；With
Collaborate control loop (3), the interflow control loop includes:
Pressure-gradient control valve (31), the pressure-gradient control valve are configured to the hydraulic fluid priority of supply that will be provided by variable steering pump (2) to steering
Circuit, and at least part of the hydraulic fluid provided by variable steering pump (2) can be made to pump (1) offer with by paced work
Hydraulic fluid collaborate and the hydraulic fluid at interflow is supplied to performance loop；
It is characterized in that,
The interflow control loop (3) further includes flow control valve (32), flow control valve setting in the pressure-gradient control valve and
Between performance loop, and it is configured to can be realized different opening ratios under the control of pilot pressure signal.
2. hydraulic system according to claim 1, which is characterized in that the hydraulic system further includes pilot control circuit
(4), on the one hand the pilot control circuit controls the work of performance loop to the performance loop output pressure signal, another
Aspect exports the pilot pressure signal to the flow control valve.
3. hydraulic system according to claim 2, which is characterized in that the interflow control loop (3) further includes shuttle valve
(33), the first input port of the shuttle valve and the oil outlet of the flow control valve fluidly connect, and the second input port is used for
The load signal for coming low damage circuit is received, output port is used to output signal being transmitted to the variable steering pump (2), so as to
Control the output of variable steering pump.
4. hydraulic system according to claim 2 or 3, which is characterized in that the pilot control circuit (4) includes shuttle valve group
Part and for the pilot valve component to the performance loop output pressure signal, two of each shuttle valve in the shuttle valve component
Input port is fluidly connected to two actuator ports of the corresponding pilot valve in the pilot valve component respectively, the shuttle valve component
In the output port of each shuttle valve fluidly connected with the flow control valve.
5. hydraulic system according to claim 4, which is characterized in that the shuttle valve component includes the first shuttle valve, the second shuttle
Valve and third shuttle valve, the pilot valve component include the first pilot valve, the second pilot valve and third pilot valve, the two of the first shuttle valve
A input port is fluidly connected with two actuator ports of the first pilot valve respectively, two input ports of the second shuttle valve respectively with
Two actuator ports of the second pilot valve fluidly connect, two input ports of third shuttle valve, two with third pilot valve respectively
Actuator port fluidly connects, and the output port of the first, second, third shuttle valve is fluidly connected with the flow control valve.
6. hydraulic system according to any one of claim 1-3, which is characterized in that the pressure-gradient control valve (31) is threeway ratio
Example valve, oil inlet are fluidly connected with variable steering pump (2), and the first oil outlet is fluidly connected with circuit (6) are turned to, and second is fuel-displaced
The oil inlet of mouth and the flow control valve (32) fluidly connects.
7. hydraulic system according to claim 6, which is characterized in that the interflow control loop (3) further includes check valve
(34), the oil inlet of the check valve and the second oil outlet of the pressure-gradient control valve (31) fluidly connect, the check valve it is fuel-displaced
The oil inlet of mouth and the flow control valve (32) fluidly connects.
8. hydraulic system according to claim 7, which is characterized in that the flow control valve (32) is two-way proportioning valve,
Its oil inlet and the oil outlet of the check valve (34) fluidly connect, and oil outlet is fluidly connected with performance loop.
9. a kind of Work machine, which is characterized in that the Work machine includes liquid according to any one of the preceding claims
Pressure system.
10. Work machine according to claim 9, which is characterized in that the Work machine is loading machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821746904.9U CN208907420U (en) | 2018-10-26 | 2018-10-26 | Fixed, variable dual-pump combining hydraulic system and the Work machine including the hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821746904.9U CN208907420U (en) | 2018-10-26 | 2018-10-26 | Fixed, variable dual-pump combining hydraulic system and the Work machine including the hydraulic system |
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| Publication Number | Publication Date |
|---|---|
| CN208907420U true CN208907420U (en) | 2019-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821746904.9U Active CN208907420U (en) | 2018-10-26 | 2018-10-26 | Fixed, variable dual-pump combining hydraulic system and the Work machine including the hydraulic system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110526140A (en) * | 2019-09-16 | 2019-12-03 | 江苏建筑职业技术学院 | Tyre crane auxiliary system and control method |
| WO2023070929A1 (en) * | 2021-10-29 | 2023-05-04 | 上海三一重机股份有限公司 | Quantitative and constant-variable switchable hydraulic system, and control method therefor and operation machine |
-
2018
- 2018-10-26 CN CN201821746904.9U patent/CN208907420U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110526140A (en) * | 2019-09-16 | 2019-12-03 | 江苏建筑职业技术学院 | Tyre crane auxiliary system and control method |
| WO2023070929A1 (en) * | 2021-10-29 | 2023-05-04 | 上海三一重机股份有限公司 | Quantitative and constant-variable switchable hydraulic system, and control method therefor and operation machine |
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