CN109695265B - Hydraulic system and engineering vehicle - Google Patents
Hydraulic system and engineering vehicle Download PDFInfo
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- CN109695265B CN109695265B CN201910130850.6A CN201910130850A CN109695265B CN 109695265 B CN109695265 B CN 109695265B CN 201910130850 A CN201910130850 A CN 201910130850A CN 109695265 B CN109695265 B CN 109695265B
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- 239000012530 fluid Substances 0.000 claims abstract description 200
- 238000004891 communication Methods 0.000 claims description 33
- 230000001276 controlling effect Effects 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000116 mitigating effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The application relates to a hydraulic system and an engineering vehicle, wherein the hydraulic system comprises: a hydraulic actuator comprising a first hydraulic fluid port and a second hydraulic fluid port, one of the first hydraulic fluid port and the second hydraulic fluid port being for introducing hydraulic fluid for driving the hydraulic actuator into motion and the other being for exhausting hydraulic fluid; a hydraulic pump for providing hydraulic fluid to the hydraulic actuators; the control valve comprises a first runner communicated with the hydraulic pump, a second runner communicated with the hydraulic pump, a third runner used for communicating with the hydraulic fluid tank, a fourth runner used for communicating with the hydraulic fluid tank, a first working port communicated with a first hydraulic fluid port of the hydraulic actuating element and a second working port communicated with a second hydraulic fluid port of the hydraulic actuating element, wherein the first working port can be selectively communicated with one of the first runner and the third runner, and the second working port can be selectively communicated with one of the second runner and the fourth runner. And the energy consumption of a hydraulic system is reduced.
Description
Technical Field
The application relates to the field of engineering machinery, in particular to a hydraulic system and an engineering vehicle.
Background
The hydraulic excavator is used as the most typical engineering mechanical equipment, has strong multifunctional adaptability, and plays an irreplaceable role in civil industrial fields such as transportation, construction, mineral resource exploitation and the like, and also in special fields such as large-scale hydraulic power engineering, earthquake relief military and the like. Especially, in recent years, a large number of domestic infrastructure projects are started up and constructed, so that the demands of the hydraulic excavator are continuously increased.
Fig. 1 shows a hydraulic system of a prior art excavator, which, as shown in fig. 1, comprises a hydraulic motor 5 for driving a swing member carrying an excavating arm, a hydraulic pump 2 for passing hydraulic fluid to the hydraulic motor, and a reversing valve 3 for controlling the hydraulic motor 5, the reversing valve 3 comprising a first working port a communicating with a hydraulic pump communication inlet P, a return port T communicating with a tank 1, a first working port a communicating with a first hydraulic fluid port of the hydraulic motor 5, and a second working port B communicating with a second hydraulic fluid port of the hydraulic motor 5.
The hydraulic system further comprises a brake 6 for preventing rotation of said hydraulic motor and a control valve 7 for controlling the actuation of the brake.
The hydraulic system further comprises a shuttle valve 4, the shuttle valve 4 comprising a first inlet communicating with the first working port a of the reversing valve 3, a second inlet communicating with the second working port B of the reversing valve 3 and an outlet communicating with the brake 6. The outlet of the shuttle valve 4 is used for supplying hydraulic fluid for releasing the brake of the hydraulic motor 5 to the brake 6. A valve 7 is provided in the line between the brake 6 and the shuttle valve 4.
The reversing valve 3 has a first operating state, a second operating state and a third operating state, in which the first operating port a of the reversing valve 3 is in communication with the inlet P and the second operating port B of the reversing valve 3 is in communication with the return port T. In the second state, the second working port B of the reversing valve 3 is in communication with the inlet P, and the first working port a of the reversing valve 3 is in communication with the return port T. In the second state, the first working port A of the reversing valve 3 is not communicated with the inlet P and the backflow port T, and the second working port B of the reversing valve 3 is not communicated with the inlet P and the backflow port T.
The direction of movement of the hydraulic motor 5 when the directional valve 3 is in the first state is opposite to the direction of movement when the directional valve 3 is in the second state, the directional valve 3 is in the third state, and the hydraulic motor 5 stops rotating. When the reversing valve 3 is in the third state, the hydraulic fluid discharged by the hydraulic motor 5 is blocked by the reversing valve 3, and in the process of stopping rotation of the hydraulic motor, the hydraulic motor causes larger impact on other components due to the action of inertia force, so that the hydraulic motor not only can damage the other components, but also can cause energy waste.
In addition, the flow path in the reversing valve in the hydraulic system is relatively narrow and complex, so that the resistance of the reversing valve 3 to the hydraulic fluid discharged by the hydraulic motor 5 is relatively high, and the back pressure of the hydraulic motor 5 is relatively high, which correspondingly makes the hydraulic motor 5 require relatively high driving force, and is not beneficial to saving energy.
With rapid global industrialization development, energy shortage and environmental problems become serious, and the requirements of the whole society on energy conservation and emission reduction are also more and more strict. The traditional hydraulic excavator has the advantages of large storage capacity, low fuel utilization rate and serious emission pollution, and has formed a serious challenge for energy demand and environmental protection, so that energy conservation and emission reduction have become the future development trend.
Disclosure of Invention
The application aims to provide a hydraulic system and an engineering vehicle, so as to solve the problem that the hydraulic system is unfavorable for solving energy sources in the prior art.
According to one aspect of an embodiment of the present application, there is provided a hydraulic system including:
a hydraulic actuator comprising a first hydraulic fluid port and a second hydraulic fluid port, one of the first hydraulic fluid port and the second hydraulic fluid port being for introducing hydraulic fluid for driving the hydraulic actuator into motion and the other being for exhausting hydraulic fluid;
a hydraulic pump for providing hydraulic fluid to the hydraulic actuators;
a control valve including a first flow passage communicated with the hydraulic pump, a second flow passage communicated with the hydraulic pump, a third flow passage communicated with the hydraulic fluid tank, a fourth flow passage communicated with the hydraulic fluid tank, a first working port communicated with a first hydraulic fluid port of the hydraulic actuator and a second working port communicated with a second hydraulic fluid port of the hydraulic actuator,
wherein the first working port is selectively in communication with one of the first flow passage and the third flow passage, and the second working port is selectively in communication with one of the second flow passage and the fourth flow passage.
Optionally, the control valve further comprises a first valve disposed in the first flow passage, a second valve disposed in the second flow passage, a third valve disposed in the third flow passage, and a fourth valve disposed in the fourth flow passage.
Alternatively, the process may be carried out in a single-stage,
the first valve is a flow regulating valve; and/or
The second valve is a flow regulating valve; and/or
The third valve is a flow regulating valve; and/or
The fourth valve is a flow regulating valve.
Optionally, the control valve comprises:
a first control valve for providing a first flow passage, a third flow passage and a first working port thereon; and
the second control valve is arranged separately from the first control valve and is used for arranging a second flow passage, a fourth flow passage and a second working port on the second control valve.
Optionally, the hydraulic system further comprises an accumulator communicable with the hydraulic actuator for absorbing hydraulic fluid discharged by the hydraulic actuator during braking of the hydraulic actuator and/or for providing hydraulic fluid to the hydraulic actuator during actuation of the hydraulic actuator.
Alternatively, the process may be carried out in a single-stage,
the accumulator is selectively in communication with one of the first and second working ports of the control valve to introduce hydraulic fluid provided by the hydraulic pump,
the accumulator is selectively in communication with one of the first hydraulic fluid port and the second hydraulic fluid port of the hydraulic actuator to provide hydraulic fluid to the hydraulic actuator during actuation of the hydraulic actuator.
Optionally, the hydraulic system further comprises a reversing valve comprising a first fluid port in communication with the first working port of the control valve, a second fluid port in communication with the second working port of the control valve, and a third fluid port in communication with the accumulator, the reversing valve having a first state in which the first fluid port and the third fluid port are in communication and a second state in which the second fluid port and the third fluid port are in communication.
Optionally, the reversing valve includes:
a first control fluid port in communication with both the first working port of the control valve and the first hydraulic fluid port of the hydraulic actuator for introducing hydraulic fluid that switches the reversing valve to the first state;
and a second control fluid port, which is communicated with the second working port of the control valve and the second hydraulic fluid port of the hydraulic actuator, for introducing hydraulic fluid for switching the reversing valve to the second state.
Optionally, the hydraulic system further comprises:
a first conduit including a first end in communication with both the first working port of the control valve and the first fluid port of the reversing valve and a second end in communication with the second hydraulic fluid port of the hydraulic actuator; and
and a second conduit including a first end in communication with both the second working port of the control valve and the second fluid port of the reversing valve and a second end in communication with the second hydraulic fluid port of the hydraulic actuator.
Optionally, the hydraulic system further comprises:
a first branch for delivering the hydraulic fluid output from the third fluid port of the reversing valve to the accumulator;
a second branch for delivering the hydraulic fluid in the accumulator to the hydraulic actuator, and
and a valve for controlling one of the first branch and the second branch to be conducted.
Optionally, the valves include a fifth valve disposed in the first branch and a sixth valve disposed in the second branch.
Optionally, the hydraulic system further comprises a controller for controlling the first branch to conduct during braking of the hydraulic actuator or for controlling the second branch to conduct during braking of the hydraulic actuator.
Optionally, the hydraulic system further comprises:
a first overflow valve in communication with the third fluid port of the reversing valve;
and a controller electrically connected with the first relief valve for closing the first relief valve when the accumulator absorbs and/or discharges hydraulic fluid.
Optionally, the hydraulic system further comprises a second relief valve for limiting the pressure in the accumulator below a predetermined value.
Optionally, the hydraulic system further comprises an unloading flow path for discharging the hydraulic fluid in the accumulator, the unloading flow path being provided with an unloading valve therein.
Optionally, the hydraulic actuator comprises one of a hydraulic motor and a hydraulic cylinder.
According to another aspect of the application, there is also provided an engineering vehicle comprising the hydraulic system described above.
Optionally, the engineering vehicle includes:
the frame of the vehicle is provided with a frame,
the rotary part is arranged on the frame and can rotate relative to the frame by taking a vertical rotation axis as a rotation center;
and a working part mounted on the rotating member.
Optionally, the working portion includes a working arm connected to the swivel member and a digger attached to an end of the working arm remote from the swivel.
By applying the technical scheme of the application, the control valve is provided with the independent flow passage for conveying the hydraulic fluid discharged by the hydraulic actuating element, the flow passage of the control valve has small resistance to the hydraulic fluid, the movement resistance of the hydraulic actuating element is correspondingly small, the back pressure of the hydraulic fluid output by the hydraulic actuating element is small, and the energy consumption of a hydraulic system is reduced.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 shows a schematic diagram of a prior art hydraulic system;
FIG. 2 shows a schematic view of a portion of a hydraulic system of an embodiment of the present application; and
fig. 3 shows an exploded view of another part of the hydraulic system of an embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 2 shows a schematic structural view of a part of the hydraulic system of the present embodiment, and fig. 3 shows a schematic structural view of another part of the hydraulic system of the present embodiment.
As shown in conjunction with fig. 2 and 3, the hydraulic system of the present embodiment includes a hydraulic actuator 24, a hydraulic pump for supplying the hydraulic actuator 24 with hydraulic fluid, and a control valve 1 for controlling the hydraulic actuator 24. The hydraulic actuators 24 include one of hydraulic motors and hydraulic cylinders.
The hydraulic actuator 24 includes a first hydraulic fluid port and a second hydraulic fluid port, one of which is used to introduce hydraulic fluid that drives movement of the hydraulic actuator 24 and the other of which is used to drain hydraulic fluid during movement of the hydraulic actuator 24.
Wherein, when the hydraulic actuator 24 moves in the first direction, a first hydraulic fluid port of the hydraulic actuator 24 introduces hydraulic fluid that drives the hydraulic actuator 24 in motion, and a second hydraulic fluid port of the hydraulic actuator 24 discharges hydraulic fluid.
When the hydraulic actuator 24 moves in a second direction opposite the first direction, the second hydraulic fluid port of the hydraulic actuator 24 introduces hydraulic fluid that drives the hydraulic actuator 24 in motion, and the first hydraulic fluid port of the hydraulic actuator 24 discharges hydraulic fluid.
The control valve 1 includes a first flow passage R1 communicating with the hydraulic pump, a second flow passage L1 communicating with the hydraulic pump, a third flow passage R2 for communicating with the hydraulic fluid tank 8, a fourth flow passage L2 for communicating with the hydraulic fluid tank 8, a first working port communicating with a first hydraulic fluid port of the hydraulic actuator 24, and a second working port communicating with a second hydraulic fluid port of the hydraulic actuator 24.
Wherein the first working port is selectively in communication with one of the first and third flow passages R1, R2, and the second working port is selectively in communication with one of the second and fourth flow passages L1, L2.
The third flow passage R2 and the fourth flow passage L2 of the control valve 1 of the present embodiment are used for delivering the hydraulic fluid discharged from the hydraulic actuator 24 to the hydraulic fluid tank 8, so it can be seen that the control valve 1 in the present embodiment has an independent flow passage for delivering the hydraulic fluid discharged from the hydraulic actuator 24, and the flow passage of the hydraulic fluid of the control valve 1 has a small resistance to the hydraulic fluid, and accordingly, the movement resistance of the hydraulic actuator 24 is small, and the back pressure of the hydraulic fluid output from the hydraulic actuator 24 is small, which is beneficial to reducing the energy consumption of the hydraulic system.
The control valve 1 further comprises a first valve 2 arranged in the first flow path R1, a second valve 4 arranged in the second flow path L1, a third valve 3 arranged in the third flow path R2 and a fourth valve 5 arranged in the fourth flow path L2.
When the hydraulic actuator is required to move in the first direction, the first valve 2 and the fourth valve 5 are opened, the second valve 3 and the third valve 4 are closed, and hydraulic fluid output from the hydraulic pump is delivered to the first hydraulic fluid port of the hydraulic actuator 24 through the first flow passage R1, the first working port of the control valve 1 and the first pipe 6 to drive the hydraulic actuator 24 to move in the first direction. During movement of the hydraulic actuator 24 in the first direction, hydraulic fluid displaced from the second hydraulic fluid port is returned to the hydraulic fluid tank 8 via the second conduit 7, the second working port of the control valve 1 and the fourth flow path L2.
When the hydraulic actuator is required to move in the second direction, the first valve 2 and the fourth valve 5 are closed, the second valve 3 and the third valve 4 are opened, and the hydraulic fluid output by the hydraulic pump is delivered to the second hydraulic fluid port of the hydraulic actuator 24 through the second flow path L1, the second working port and the second pipeline 7 to drive the hydraulic actuator to move in the second direction. During movement of the hydraulic actuator 24 in the second direction, hydraulic fluid displaced from the first hydraulic fluid port is returned to the hydraulic fluid tank 8 via the first conduit 6, the first working port of the control valve 1 and the third flow path R2.
In the present embodiment, the first valve 2 and the second valve 4 are flow rate regulating valves, and the control valve 1 can individually control the pressure of the hydraulic fluid delivered to the hydraulic actuator 24.
In the present embodiment, the third valve 3 and the fourth valve 5 are flow rate adjusting valves, and the control valve 1 can individually adjust the back pressure of the hydraulic fluid discharged from the hydraulic actuator 24.
The control valve 1 includes a first control valve 1a and a second control valve 1b provided separately from the first control valve 1 a. Wherein the first flow passage R1, the third flow passage R2 and the first working port are provided on the first control valve 1a, and the second flow passage L1, the fourth flow passage L2 and the second working port are provided on the second control valve 1b.
The hydraulic system further includes an accumulator 18 communicable with the hydraulic actuator 24, the accumulator 18 being configured to absorb hydraulic fluid discharged by the hydraulic actuator 24 during braking of the hydraulic actuator 24 and/or to provide hydraulic fluid to the hydraulic actuator 24 during actuation of the hydraulic actuator 24.
In the related art, since the flow path for supplying the hydraulic fluid to the hydraulic pressure and the flow path for discharging the hydraulic fluid from the hydraulic actuator 24 are directly shut off when the hydraulic actuator 24 is braked, the hydraulic actuator 24 is greatly impacted.
In the prior art, the movement speed during the starting process of the hydraulic actuator 24 is smaller, the flow rate of the hydraulic fluid required by the movement of the hydraulic actuator 24 is smaller, and a part of the hydraulic fluid provided by the hydraulic pump is overflowed back to the hydraulic fluid tank 8, so that energy waste is also caused, and the energy consumption is not beneficial to reduction.
In this embodiment, the accumulator 18 absorbs hydraulic fluid discharged from the hydraulic actuator 24 during braking of the hydraulic actuator 24, and accumulates the energy while mitigating shock during braking of the hydraulic actuator 24.
During the start-up of the hydraulic actuator 24, the accumulator 18 delivers hydraulic fluid to the hydraulic actuator 24 that drives the hydraulic actuator 24 to move so that the hydraulic actuator reaches a predetermined operating speed as soon as possible, reducing waste caused by the overflow of part of the hydraulic fluid output by the hydraulic pump back to the hydraulic fluid tank 8.
The hydraulic system further comprises a reversing valve 10, the reversing valve 10 comprising a first fluid port communicating with the first working port of the control valve 1, a second fluid port communicating with the second working port of the control valve 1 and a third fluid port communicating with the accumulator 18, the reversing valve 10 having a first state in which the first fluid port and the third fluid port are in communication and a second state in which the second fluid port and the third fluid port are in communication.
The reversing valve 10 includes a first control fluid port and a second control fluid port. The first control fluid port communicates with both the first working port of the control valve 1 and the first hydraulic fluid port of the hydraulic actuator 24 for introducing hydraulic fluid for switching the directional valve 10 to the first state;
the second control fluid port communicates with both the second working port of the control valve 1 and the second hydraulic fluid port of the hydraulic actuator 24 for introducing hydraulic fluid for switching the directional valve 10 to the second state.
The hydraulic system further comprises a first line 6 and a second line 7. The first conduit 6 comprises a first end communicating with both the first working port of the control valve 1 and the first fluid port of the reversing valve 10 and a second end communicating with the second hydraulic fluid port of the hydraulic actuator 24.
The second conduit 7 comprises a first end communicating with both the second working port of the control valve 1 and the second fluid port of the reversing valve 10 and a second end communicating with the second hydraulic fluid port of the hydraulic actuator 24.
The hydraulic system further includes a first branch, a second branch, and a valve for controlling communication of one of the first branch and the second branch. The first branch is used to convey the hydraulic fluid output from the third fluid port of the reversing valve 10 to the accumulator 18.
A first one-way valve 12 is arranged in the first branch and a second one-way valve 15 is arranged in the second branch.
The second branch is connected in parallel with the first branch and is used to deliver hydraulic fluid in the accumulator 18 to the hydraulic actuators 24.
The valves comprise a fifth valve 11 arranged in the first branch and a sixth valve 14 arranged in the second branch.
The fifth valve 11 and the sixth valve 14 are solenoid valves, and the hydraulic system further includes a controller 13 electrically connected to both the fifth valve 11 and the sixth valve 14. The controller 13 controls the on-off state of the first branch and the second branch by controlling the on-off state of the fifth valve 11 and the sixth valve 14.
The controller 13 is used to control the first branch to conduct during braking of the hydraulic actuator or to control the second branch to conduct during actuation of the hydraulic actuator 24.
When braking the hydraulic actuator 24 moving in the first direction, the first valve 2 is closed to shut off the flow path of the hydraulic fluid to the first hydraulic fluid port of the first hydraulic actuator 24, the hydraulic actuator 24 continues to move in the first direction due to inertia, and the hydraulic fluid discharged from the second hydraulic fluid port of the hydraulic actuator 24 acts on the second control fluid port of the directional valve 10 to switch the directional valve 10 to the second state. The controller 13 controls the fifth valve 11 to open and hydraulic fluid discharged from the second hydraulic fluid port of the hydraulic actuator 24 is delivered to the accumulator 18 via the second conduit 7, the second fluid port, the third fluid port and the first branch of the reversing valve 10. The accumulator 18 is capable of storing hydraulic fluid discharged from the hydraulic actuators 24 while also being capable of mitigating the impact of the hydraulic actuator braking process.
When the hydraulic actuator 24 moving in the second direction is braked, the second valve 4 is closed to shut off the flow path of the hydraulic fluid to the second hydraulic fluid port of the first hydraulic actuator 24, the hydraulic actuator 24 continues to move in the second direction due to inertia, and the hydraulic fluid discharged from the first hydraulic fluid port of the hydraulic actuator 24 acts on the first control fluid port of the directional valve 10 to switch the directional valve 10 to the first state. The controller 13 controls the fifth valve 11 to open and hydraulic fluid discharged from the first hydraulic fluid port of the hydraulic actuator 24 is delivered to the accumulator 18 via the first conduit 6, the first fluid port, the third fluid port and the first branch of the reversing valve 10. The accumulator 18 is capable of storing hydraulic fluid discharged from the hydraulic actuators 24 while also being capable of mitigating the impact of the hydraulic actuator braking process.
When the hydraulic actuator 24 is actuated to move in the first direction, the first valve 2 and the fourth valve 5 are opened, the hydraulic fluid supplied by the hydraulic pump acts on the first control fluid port of the reversing valve 10 via the first flow path R1 and the first working port of the control valve 1, so that the reversing valve is switched to the first state, the controller 13 controls the sixth valve 14 in the second branch to open, and the hydraulic fluid in the accumulator 18 is delivered to the first hydraulic fluid port of the hydraulic actuator 24 via the second branch, the third fluid port of the reversing valve 10, the second fluid port and the first conduit 6. The hydraulic fluid provided by the hydraulic pump is fed via the first flow path R1 of the control valve 1 and the first conduit 6 to the first hydraulic fluid of the hydraulic actuator 24.
The process of actuating the movement of the hydraulic actuator 24 in the second direction is similar to the process of actuating the movement of the hydraulic actuator 24 in the first direction, and will not be described in detail.
It can be seen that during actuation of hydraulic actuator 24, accumulator 18 is capable of assisting the hydraulic pump in driving hydraulic actuator 24, so that hydraulic actuator 24 can be quickly actuated, which is beneficial for reducing energy consumption.
The hydraulic system further comprises a first relief valve 9, the inlet of the first relief valve 9 being in communication with the inlet end of the first branch. The inlet of the first overflow valve 9 communicates with the outlet end of the second branch.
Alternatively, the first relief valve 9 is a solenoid valve, and the controller 13 is electrically connected to the first relief valve 9 to control the relief pressure of the first relief valve 9.
A controller 13 is electrically connected to the first relief valve 9 and closes the first relief valve 9 when the accumulator 18 absorbs and/or discharges hydraulic fluid.
The hydraulic system further comprises a second relief valve 16 in communication with the accumulator 18, the second relief valve 16 being adapted to limit the pressure within the accumulator 18 below a predetermined value. The hydraulic system further comprises a pressure detection member 17 for detecting the pressure of the hydraulic fluid in the accumulator 18.
The hydraulic system further comprises an unloading flow path for discharging the hydraulic fluid in the accumulator 18, in which unloading flow path an unloading valve 19 is arranged.
The hydraulic system further comprises a brake 25 for preventing movement of the hydraulic actuator 24, a first trim valve 20, a second trim valve 21, a first trim valve 22 and a second trim valve 23.
The hydraulic system of the embodiment has the following technical effects:
(1) The flow path of the hydraulic system for delivering hydraulic fluid to the hydraulic actuator 24 and the flow path for discharging hydraulic fluid during the movement of the output hydraulic actuator 24 can be independently controlled to open and close or to flow;
(2) The hydraulic actuator 24 can be adjusted for resistance and back pressure of hydraulic fluid discharged during movement, thereby reducing system pressure losses;
(3) The energy recovery device of the independent flow control valve and the energy accumulator is easier to install, flexible in interface and easier to realize on the excavator than the energy recovery device of the traditional hydraulic control multi-way reversing valve and the energy accumulator;
(4) The hydraulic executive component 24 generates larger pressure impact in the braking process, so that the kinetic energy of the motor is converted into heat to be dissipated, and the energy in the braking process is recovered by using the energy accumulator, so that the heat dissipation of the system can be reduced, the reliability of the system is improved, and the service life of parts is prolonged;
(5) In the starting process of the hydraulic executive component, the rotation of the turntable is accelerated slowly due to the large moment of inertia of the turntable of the excavator and the executive mechanism and the large moment of inertia resistance, and the starting speed of the turntable can be improved by utilizing the energy released by the energy accumulator.
According to another aspect of the present application, there is also provided an engineering vehicle including the hydraulic system described above.
The engineering vehicle further comprises a frame, a rotating part arranged on the frame and a working part arranged on the rotating part.
Optionally, the work vehicle is an excavator, and the working portion of the work vehicle includes a work arm and an excavating bucket mounted at an end of the work arm remote from the swing member.
Optionally, the working part of the engineering vehicle comprises a telescopic arm and a lifting hook connected to one end of the telescopic arm.
The foregoing description of the exemplary embodiments of the application is not intended to limit the application to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application.
Claims (19)
1. A hydraulic system, comprising:
a hydraulic actuator (24) comprising a first hydraulic fluid port and a second hydraulic fluid port, one of the first hydraulic fluid port and the second hydraulic fluid port being for introducing hydraulic fluid for driving the hydraulic actuator (24) in motion and the other for exhausting hydraulic fluid;
-a hydraulic pump for providing hydraulic fluid to the hydraulic actuator (24);
a control valve (1) comprising a first flow passage (R1) communicating with the hydraulic pump, a second flow passage (L1) communicating with the hydraulic pump, a third flow passage (R2) for communicating with a hydraulic fluid tank (8), a fourth flow passage (L2) for communicating with the hydraulic fluid tank (8), a first working port communicating with a first hydraulic fluid port of the hydraulic actuator (24) and a second working port communicating with a second hydraulic fluid port of the hydraulic actuator (24),
wherein the first working port is selectively communicable with one of the first flow passage (R1) and the third flow passage (R2), and the second working port is selectively communicable with one of the second flow passage (L1) and the fourth flow passage (L2).
2. The hydraulic system according to claim 1, characterized in that the control valve (1) further comprises a first valve (2) provided in the first flow channel (R1), a second valve (4) provided in the second flow channel (L1), a third valve (3) provided in the third flow channel (R2) and a fourth valve (5) provided in the fourth flow channel (L2).
3. The hydraulic system of claim 2, wherein the hydraulic system is configured to,
the first valve (2) is a flow regulating valve; and/or
The second valve (4) is a flow regulating valve; and/or
The third valve (3) is a flow regulating valve; and/or
The fourth valve (5) is a flow regulating valve.
4. The hydraulic system according to claim 1, characterized in that the control valve (1) comprises:
a first control valve (1 a) for providing the first flow passage (R1), the third flow passage (R2) and the first working port thereon; and
a second control valve (1 b) which is arranged separately from the first control valve (1 a) and is used for arranging the second flow passage (L1), the fourth flow passage (L2) and the second working port on the second control valve.
5. The hydraulic system according to claim 1, further comprising an accumulator (18) in fluid connection with the hydraulic actuator (24), the accumulator (18) being adapted to absorb hydraulic fluid discharged by the hydraulic actuator during braking of the hydraulic actuator (24) and/or to supply hydraulic fluid to the hydraulic actuator (24) during actuation of the hydraulic actuator (24).
6. The hydraulic system of claim 5, wherein the hydraulic system is configured to,
the accumulator (18) being selectively communicable with one of the first and second working ports of the control valve (1) to introduce hydraulic fluid provided by the hydraulic pump,
the accumulator (18) is selectively communicable with one of the first and second hydraulic fluid ports of the hydraulic actuator (24) to provide hydraulic fluid to the hydraulic actuator (24) during actuation of the hydraulic actuator (24).
7. The hydraulic system of claim 6, further comprising a reversing valve (10), the reversing valve (10) comprising a first fluid port in communication with the first working port of the control valve (1), a second fluid port in communication with the second working port of the control valve (1), and a third fluid port in communication with the accumulator (18), the reversing valve (10) having a first state in which the first and third fluid ports are in communication and a second state in which the second and third fluid ports are in communication.
8. The hydraulic system according to claim 7, characterized in that the reversing valve (10) comprises:
a first control fluid port communicating with both a first working port of the control valve (1) and a first hydraulic fluid port of the hydraulic actuator (24) for introducing hydraulic fluid for switching the reversing valve (10) to the first state;
and a second control fluid port which is communicated with a second working port of the control valve (1) and a second hydraulic fluid port of the hydraulic actuator (24) and is used for introducing hydraulic fluid for switching the reversing valve (10) to the second state.
9. The hydraulic system of claim 8, further comprising:
a first conduit (6) comprising a first end communicating with both the first working port of the control valve (1) and the first fluid port of the reversing valve (10) and a second end communicating with the second hydraulic fluid port of the hydraulic actuator (24); and
a second conduit (7) comprising a first end communicating with both the second working port of the control valve (1) and the second fluid port of the reversing valve (10) and a second end communicating with the second hydraulic fluid port of the hydraulic actuator (24).
10. The hydraulic system of claim 7, further comprising:
a first branch for delivering the hydraulic fluid output by the third fluid port of the reversing valve (10) to the accumulator (18);
a second branch for delivering hydraulic fluid in the accumulator (18) to the hydraulic actuator (24), and
and a valve for controlling one of the first and second branches to be conducted.
11. Hydraulic system according to claim 10, characterized in that the valves comprise a fifth valve (11) provided in the first branch and a sixth valve (14) provided in the second branch.
12. The hydraulic system according to claim 10, further comprising a controller (13) for controlling the first branch to conduct during braking of the hydraulic actuator or for controlling the second branch to conduct during braking of the hydraulic actuator (24).
13. The hydraulic system of claim 7, further comprising:
a first overflow valve (9) in communication with a third fluid port of the reversing valve (10);
a controller (13) electrically connected to the first relief valve (9) for closing the first relief valve (9) when the accumulator (18) absorbs and/or discharges hydraulic fluid.
14. The hydraulic system of claim 5, further comprising a second relief valve (16) for limiting the pressure in the accumulator (18) below a predetermined value.
15. Hydraulic system according to claim 5, characterized in that it further comprises an unloading flow path for discharging the hydraulic fluid in the accumulator (18), in which unloading flow path an unloading valve (19) is arranged.
16. The hydraulic system of claim 1, wherein the hydraulic actuator comprises one of a hydraulic motor and a hydraulic cylinder.
17. A work vehicle comprising the hydraulic system of any one of claims 1 to 16.
18. The work vehicle of claim 17, wherein the work vehicle comprises:
the frame of the vehicle is provided with a frame,
the rotary part is arranged on the frame and can rotate relative to the frame by taking a vertical rotation axis as a rotation center;
and a working unit mounted on the rotating member.
19. The work vehicle of claim 18, wherein the work portion includes a work arm coupled to the swing member and a digger attached to an end of the work arm remote from the swing portion.
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