CN210163954U - Hydraulic system and engineering vehicle - Google Patents
Hydraulic system and engineering vehicle Download PDFInfo
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- CN210163954U CN210163954U CN201920221364.0U CN201920221364U CN210163954U CN 210163954 U CN210163954 U CN 210163954U CN 201920221364 U CN201920221364 U CN 201920221364U CN 210163954 U CN210163954 U CN 210163954U
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Abstract
The utility model relates to a hydraulic system and engineering vehicle, hydraulic system includes: the hydraulic actuator comprises a first hydraulic fluid port and a second hydraulic fluid port, one of the first hydraulic fluid port and the second hydraulic fluid port is used for introducing hydraulic fluid for driving the hydraulic actuator to move, and the other one of the first hydraulic fluid port and the second hydraulic fluid port is used for discharging the hydraulic fluid; a hydraulic pump for providing hydraulic fluid to the hydraulic actuators; and the control valve comprises 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 box, a fourth flow passage communicated with the hydraulic fluid box, 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 flow passage and the third flow passage, and the second working port can be selectively communicated with one of the second flow passage and the fourth flow passage. The energy consumption of the hydraulic system is reduced.
Description
Technical Field
The utility model relates to an engineering machine tool field particularly, relates to a hydraulic system and engineering vehicle.
Background
The hydraulic excavator, as a most typical engineering mechanical device, has powerful multifunctional adaptability, and plays an irreplaceable role in civil industrial fields such as transportation, construction and mineral resource exploitation, and in special fields such as large-scale hydraulic and electric engineering and earthquake-resistant and disaster-relief military. Particularly, in recent years, the demand of hydraulic excavators is rising due to the construction of a large number of domestic infrastructure projects.
Fig. 1 shows a hydraulic system of an excavator of the related art, and as shown in fig. 1, the hydraulic system includes a hydraulic motor 5 for driving a swing member carrying an excavating arm, a hydraulic pump 2 for supplying hydraulic fluid to the hydraulic motor, and a direction change valve 3 for controlling the hydraulic motor 5, and the direction change valve 3 includes a hydraulic pump communication inlet P, a return port T communicating with an oil 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 directional valve 3, a second inlet communicating with the second working port B of the directional valve 3 and an outlet communicating with the brake 6. The outlet of the shuttle valve 4 is used to deliver hydraulic fluid to the brake 6 to release the brake to the hydraulic motor 5. A valve 7 is provided on the line between the brake 6 and the shuttle valve 4.
The reversing valve 3 has a first working state, a second working state and a third working state, wherein in the first state, a first working port A of the reversing valve 3 is communicated with the inlet P, and a second working port B of the reversing valve 3 is communicated with the return port T. In the second state, the second working port B of the reversing valve 3 is communicated with the inlet P, and the first working port a of the reversing valve 3 is communicated with the return port T. In the second state, the first working port a of the reversing valve 3 is not conducted with the inlet P and the return port T, and the second working port B of the reversing valve 3 is also not conducted with the inlet P and the return port T.
When the reversing valve 3 is in the first state, the movement direction of the hydraulic motor 5 is opposite to the movement direction when the reversing valve 3 is in the second state, when the reversing valve 3 is in the third state, 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 cut off by the reversing valve 3, and the hydraulic motor stops rotating and causes large impact to other components due to the action of inertia force, so that the other components are damaged and energy waste is caused.
In addition, the flow path in the directional control valve in the hydraulic system is narrow and complicated, so the resistance of the directional control valve 3 to the hydraulic fluid discharged by the hydraulic motor 5 is large, and the back pressure of the hydraulic motor 5 is large, which correspondingly causes the hydraulic motor 5 to need large driving force, which is not beneficial to saving energy.
With the rapid development of global industrialization, energy shortage and environmental problems become more serious, and the requirements of the whole society on energy conservation and emission reduction become more and more strict. The traditional hydraulic excavator has the advantages of large reserved quantity, low fuel utilization rate and serious emission pollution, and has a severe challenge on energy demand and environmental protection, and energy conservation and emission reduction become the development trend in the future.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hydraulic system and engineering vehicle to improve among the prior art the problem that hydraulic system is unfavorable for solving the energy.
According to the utility model discloses an aspect of the embodiment, the utility model provides a hydraulic system, hydraulic system includes:
the hydraulic actuator comprises a first hydraulic fluid port and a second hydraulic fluid port, one of the first hydraulic fluid port and the second hydraulic fluid port is used for introducing hydraulic fluid for driving the hydraulic actuator to move, and the other one of the first hydraulic fluid port and the second hydraulic fluid port is used for discharging the hydraulic fluid;
a hydraulic pump for providing hydraulic fluid to the hydraulic actuators;
a control valve including a first flow passage communicating with the hydraulic pump, a second flow passage communicating with the hydraulic pump, a third flow passage communicating with the hydraulic fluid tank, a fourth flow passage communicating with the hydraulic fluid tank, a first working port communicating with the first hydraulic fluid port of the hydraulic actuator, and a second working port communicating with the second hydraulic fluid port of the hydraulic actuator,
wherein the first working port is selectively communicable with one of the first flow passage and the third flow passage, and the second working port is selectively communicable 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 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 the first flow passage, the third flow passage and the first working port thereon; and
and the first control valve is separated 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 first control valve.
Optionally, the hydraulic system further comprises an accumulator communicable with the hydraulic actuator for absorbing hydraulic fluid displaced by the hydraulic actuator during braking of the hydraulic actuator and/or for supplying hydraulic fluid to the hydraulic actuator during actuation of the hydraulic actuator.
Alternatively,
the accumulator is selectively communicable with one of the first and second working ports of the control valve to introduce the hydraulic fluid supplied from the hydraulic pump,
the accumulator is selectively in communication with one of the first and second hydraulic fluid ports 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 directional valve including 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 directional valve 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.
Optionally, the reversing valve comprises:
a first control fluid port communicating with both the first working port of the control valve and the first hydraulic fluid port of the hydraulic actuator for introducing hydraulic fluid for switching the directional control valve to the first state;
and a second control fluid port in communication with both 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 directional control 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 directional valve and a second end in communication with the second hydraulic fluid port of the hydraulic actuator; and
and the second pipeline comprises a first end communicated with the second working port of the control valve and the second fluid port of the reversing valve and a second end communicated with the second hydraulic fluid port of the hydraulic actuator.
Optionally, the hydraulic system further comprises:
the first branch circuit is used for conveying the hydraulic fluid output by the third fluid port of the reversing valve to the accumulator;
a second branch for conveying the hydraulic fluid in the accumulator to the hydraulic actuator, an
And the valve is used for controlling the conduction of one of the first branch and the second branch.
Optionally, the valves comprise a fifth valve provided in the first branch and a sixth valve provided 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:
the first overflow valve is communicated with the third fluid port of the reversing valve;
and a controller electrically connected to the first relief valve for closing the first relief valve when the accumulator absorbs and/or discharges the 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 draining hydraulic fluid from the accumulator, the unloading flow path having an unloading valve disposed therein.
Optionally, the hydraulic actuator comprises one of a hydraulic motor and a hydraulic cylinder.
According to the utility model discloses an on the other hand still provides an engineering vehicle, and engineering vehicle includes foretell hydraulic system.
Optionally, the work vehicle comprises:
the frame is provided with a front wheel and a rear wheel,
a revolving member mounted on the frame and rotatable about a vertical axis of rotation relative to the frame;
and a working part mounted on the rotary member.
Optionally, the working portion comprises a working arm connected to the swivel member and an excavating bucket connected at an end of the working arm remote from the swivel.
By applying the technical scheme, the control valve is provided with the independent flow channel for conveying the hydraulic fluid discharged by the hydraulic actuating element, the flow channel of the control valve has small resistance to the hydraulic fluid, correspondingly, the movement resistance of the hydraulic actuating element is small, the back pressure of the hydraulic fluid output by the hydraulic actuating element is small, and the reduction of the energy consumption of a hydraulic system is facilitated.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 shows a schematic diagram of a prior art hydraulic system;
FIG. 2 shows a schematic diagram of a portion of a hydraulic system of an embodiment of the present invention; and
fig. 3 shows an exploded view of another portion of a hydraulic system of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 2 shows a schematic configuration diagram of a part of the hydraulic system of the present embodiment, and fig. 3 shows a schematic configuration diagram of another part of the hydraulic system of the present embodiment.
As shown in fig. 2 and 3 in conjunction, the hydraulic system of the present embodiment includes a hydraulic actuator 24, a hydraulic pump for supplying hydraulic fluid to the hydraulic actuator 24, and a control valve 1 for controlling the hydraulic actuator 24. The hydraulic actuator 24 includes one of a hydraulic motor and a hydraulic cylinder.
Wherein a first hydraulic fluid port of the hydraulic actuator 24 introduces hydraulic fluid that drives movement of the hydraulic actuator 24 and a second hydraulic fluid port of the hydraulic actuator 24 exhausts hydraulic fluid when the hydraulic actuator 24 is moved in a first direction.
When the hydraulic actuator 24 is moved in a second direction opposite the first direction, a second hydraulic fluid port of the hydraulic actuator 24 introduces hydraulic fluid that drives the movement of the hydraulic actuator 24 and a first hydraulic fluid port of the hydraulic actuator 24 exhausts 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 the first hydraulic fluid port of the hydraulic actuator 24, and a second working port communicating with the 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.
The third flow passage R2 and the fourth flow passage L2 of the control valve 1 of the present embodiment are used for conveying the hydraulic fluid discharged by the hydraulic actuator 24 to the hydraulic fluid tank 8, and therefore, it can be seen that the control valve 1 of the present embodiment has an independent flow passage for conveying the hydraulic fluid discharged by the hydraulic actuator 24, the resistance of the flow passage of the hydraulic fluid of the control valve 1 to the hydraulic fluid is small, accordingly, the movement resistance of the hydraulic actuator 24 is small, the back pressure of the hydraulic fluid output by the hydraulic actuator 24 is small, and the reduction of the energy consumption of the hydraulic system is facilitated.
The control valve 1 further includes a first valve 2 provided in the first flow passage R1, and a second valve 4 provided in the second flow passage L1, a third valve 3 provided in the third flow passage R2, and a fourth valve 5 provided in the fourth flow passage 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 the hydraulic fluid output from the hydraulic pump is delivered to the first hydraulic fluid port of the hydraulic actuator 24 via the first flow passage R1, the first working port of the control valve 1 and the first line 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 line 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 from the hydraulic pump is delivered to the second hydraulic fluid port of the hydraulic actuator 24 via the second flow passage L1, the second working port and the second line 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 line 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 regulating valves, and the control valve 1 can individually control the pressure of the hydraulic fluid supplied to the hydraulic actuator 24.
In the present embodiment, the third valve 3 and the fourth valve 5 are flow regulating valves, and the control valve 1 can individually regulate 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 1 b.
The hydraulic system further includes an accumulator 18 communicable with the hydraulic actuators 24, the accumulator 18 for absorbing hydraulic fluid displaced by the hydraulic actuators 24 during braking of the hydraulic actuators 24 and/or for providing hydraulic fluid to the hydraulic actuators 24 during actuation of the hydraulic actuators 24.
In the prior art, when the hydraulic actuator 24 is braked, a flow path for supplying hydraulic fluid to the hydraulic pressure and a flow path for discharging hydraulic fluid from the hydraulic actuator 24 are directly blocked, so that the impact of the hydraulic actuator 24 is large.
In the prior art, the movement speed of the hydraulic actuator 24 in the starting process is low, the flow rate of the hydraulic fluid required by the movement of the hydraulic actuator 24 is low, and a part of the hydraulic fluid provided by the hydraulic pump is overflowed to the hydraulic fluid tank 8, so that energy waste is caused, and the reduction of energy consumption is not facilitated.
In this embodiment, during braking of the hydraulic actuator 24, the accumulator 18 absorbs hydraulic fluid displaced by the hydraulic actuator 24 and accumulates energy while attenuating shock during braking of the hydraulic actuator 24.
During actuation of the hydraulic actuators 24, the accumulator 18 supplies hydraulic fluid to the hydraulic actuators 24 to move the hydraulic actuators 24 so that the hydraulic actuators reach a predetermined operating speed as quickly as possible, reducing waste caused by bleeding a portion of the hydraulic fluid output by the hydraulic pumps back to the hydraulic fluid tank 8.
The hydraulic system further comprises a directional valve 10, the directional 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 directional 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.
The directional 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 line 6 includes a first end in communication with both the first working port of the control valve 1 and the first fluid port of the directional valve 10 and a second end in communication with the second hydraulic fluid port of the hydraulic actuator 24.
The second line 7 includes a first end in communication with both the second working port of the control valve 1 and the second fluid port of the directional valve 10 and a second end in communication with the second hydraulic fluid port of the hydraulic actuator 24.
The hydraulic system also includes a first branch, a second branch, and a valve for controlling the conductance of one of the first branch and the second branch. The first branch is used to deliver hydraulic fluid output from the third fluid port of the directional 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.
A second branch is connected in parallel with the first branch and is used to convey hydraulic fluid from the accumulator 18 to the hydraulic actuator 24.
The valves comprise a fifth valve 11 provided in the first branch and a sixth valve 14 provided in the second branch.
The fifth valve 11 and the sixth valve 14 are both solenoid valves, and the hydraulic system further comprises a controller 13 electrically connected to both the fifth valve 11 and the sixth valve 14. The controller 13 controls the on-off states of the first branch and the second branch by controlling the on-off states of the fifth valve 11 and the sixth valve 14.
The control device 13 is used to control the first branch to be switched on during braking of the hydraulic actuator or to control the second branch to be switched on during actuation of the hydraulic actuator 24.
When the hydraulic actuator 24 moving in the first direction is braked, the first valve 2 is closed to shut off the flow path for supplying 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 selector valve 10 to switch the selector valve 10 to the second state. The controller 13 controls the fifth valve 11 to open and hydraulic fluid displaced 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 directional valve 10. The accumulator 18 stores hydraulic fluid displaced by the hydraulic actuators 24 while also dampening the shock 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 for supplying 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 selector valve 10 to switch the selector valve 10 to the first state. The controller 13 controls the fifth valve 11 to open and hydraulic fluid displaced 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 directional valve 10. The accumulator 18 stores hydraulic fluid displaced by the hydraulic actuators 24 while also dampening the shock of the hydraulic actuator braking process.
When the hydraulic actuator 24 is activated to move in the first direction, the first valve 2 and the fourth valve 5 are opened, hydraulic fluid supplied from the hydraulic pump acts on the first control fluid port of the directional control valve 10 via the first flow passage R1 and the first working port of the control valve 1 to shift the directional control valve to the first state, the controller 13 controls the sixth valve 14 in the second branch to be opened, and hydraulic fluid in the accumulator 18 is supplied to the first hydraulic fluid port of the hydraulic actuator 24 via the second branch, the third fluid port of the directional control valve 10, the second fluid port and the first line 6. The hydraulic fluid provided by the hydraulic pump is delivered to the first hydraulic fluid of the hydraulic actuator 24 via the first flow path R1 of the control valve 1 and the first line 6.
The process of initiating movement of hydraulic actuator 24 in the second direction is similar to the process of initiating movement of hydraulic actuator 24 in the first direction and will not be described in detail herein.
It can be seen that during the actuation of the hydraulic actuator 24, the accumulator 18 can assist the hydraulic pump in driving the hydraulic actuator 24, so that the hydraulic actuator 24 can be rapidly actuated, which is beneficial to reducing energy consumption.
The hydraulic system further comprises a first overflow valve 9, and an inlet of the first overflow valve 9 is communicated with an inlet end of the first branch. The inlet of the first overflow valve 9 is communicated 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.
The control device 13 is electrically connected to the first overflow valve 9 and closes the first overflow 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 in the accumulator 18 below a predetermined value. The hydraulic system further comprises a pressure detection means 17 for detecting the pressure of the hydraulic fluid in the accumulator 18.
The hydraulic system further comprises an unloading flow path for discharging hydraulic fluid from the accumulator 18, in which unloading flow path an unloading valve 19 is arranged.
The hydraulic system further includes a brake 25 for blocking movement of the hydraulic actuator 24, a first trim valve 20, a second trim valve 21, a first oil replenishment valve 22, and a second oil replenishment valve 23.
The hydraulic system of the embodiment has the following technical effects:
(1) the hydraulic system can independently control the opening and closing or the flow rate of a flow path for conveying hydraulic fluid to the hydraulic actuator 24 and a flow path for discharging the hydraulic fluid in the movement process of the output hydraulic actuator 24;
(2) the resistance and back pressure of the hydraulic fluid displaced by hydraulic actuator 24 during movement may be adjusted to reduce system pressure losses;
(3) compared with the traditional hydraulic control multi-way reversing valve and the energy recovery device of the energy accumulator, the energy recovery device of the independent flow control valve and the energy accumulator is easy to install, flexible in interface and easy to realize on the excavator;
(4) the hydraulic actuating element 24 can generate 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 accumulator is utilized to recover the energy in the braking process, thereby reducing the heat dissipation of the system, improving the reliability of the system and prolonging the service life of parts;
(5) in the starting process of the hydraulic actuating element, the rotation acceleration of the rotary table is slow due to the fact that the rotary inertia of the rotary table and the actuating mechanism of the excavator is large and the inertia resistance distance is large, and the starting speed of the rotary table can be increased by utilizing energy released by the energy accumulator.
According to the utility model discloses a further aspect still provides an engineering vehicle, and this engineering vehicle includes foretell hydraulic system.
The engineering vehicle also comprises a frame, a rotary component arranged on the frame and a working part arranged on the rotary component.
Optionally, the work vehicle is an excavator, the work portion of the work vehicle comprising a work arm and an excavating bucket mounted at an end of the work arm remote from the swivel member.
Optionally, the work vehicle is a crane, and the working part of the work vehicle comprises a telescopic arm and a hook connected to one end of the telescopic arm.
The above description is only exemplary embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (19)
1. A hydraulic system, comprising:
a hydraulic actuator (24) including first and second hydraulic fluid ports, one of the first and second hydraulic fluid ports for admitting hydraulic fluid for driving movement of the hydraulic actuator (24) and the other for discharging hydraulic fluid;
a hydraulic pump for providing hydraulic fluid to the hydraulic actuator (24);
a control valve (1) including 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 a 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 passage (R1), and a second valve (4) provided in the second flow passage (L1), a third valve (3) provided in the third flow passage (R2), and a fourth valve (5) provided in the fourth flow passage (L2).
3. The hydraulic system of claim 2,
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. Hydraulic system according to claim 1, characterized in that the control valve (1) comprises:
a first control valve (1a) for providing the first flow passage (R1), a third flow passage (R2) and the first working port thereon; and
and a second control valve (1b) provided separately from the first control valve (1a) and provided with the second flow passage (L1), a fourth flow passage (L2), and the second working port.
5. The hydraulic system of claim 1, further comprising an accumulator (18) communicable with the hydraulic actuator (24), the accumulator (18) for absorbing hydraulic fluid discharged by the hydraulic actuator (24) during braking of the hydraulic actuator (24) and/or for providing hydraulic fluid to the hydraulic actuator (24) during actuation of the hydraulic actuator (24).
6. The hydraulic system of claim 5,
the accumulator (18) being selectively communicable with one of the first and second working ports of the control valve (1) to introduce hydraulic fluid supplied from 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 directional valve (10), the directional valve (10) including 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 directional 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 directional control 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 directional valve (10) to the first state;
a second control fluid port communicating 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.
9. The hydraulic system of claim 8, further comprising:
a first conduit (6) comprising a first end in communication with both the first working port of the control valve (1) and the first fluid port of the directional valve (10) and a second end in communication with the second hydraulic fluid port of the hydraulic actuator (24); and
and a second pipeline (7) comprising a first end communicated with the second working port of the control valve (1) and the second fluid port of the reversing valve (10) and a second end communicated with the second hydraulic fluid port of the hydraulic actuator (24).
10. The hydraulic system of claim 7, further comprising:
a first branch for conveying the hydraulic fluid output from the third fluid port of the directional control valve (10) to the accumulator (18);
a second branch for conveying the hydraulic fluid in the accumulator (18) to the hydraulic actuator (24), and
and the valve is used for controlling the conduction of one of the first branch and the second branch.
11. A 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 of 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 relief valve (9) in communication with the third fluid port of the reversing valve (10);
a controller (13) electrically connected to the first excess flow valve (9) for closing the first excess flow valve (9) when the accumulator (18) absorbs and/or discharges hydraulic fluid.
14. A hydraulic system according to claim 5, further comprising a second spill valve (16) for limiting the pressure in the accumulator (18) below a predetermined value.
15. A hydraulic system according to claim 5, further comprising an unloading flow path for draining hydraulic fluid from the accumulator (18), the unloading flow path having an unloading valve (19) arranged therein.
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, characterized in that it comprises a hydraulic system according to any one of claims 1-16.
18. The work vehicle of claim 17, characterized in that the work vehicle comprises:
the frame is provided with a front wheel and a rear wheel,
a turning member mounted on the frame and rotatable with respect to the frame about a vertical axis of rotation;
and a working part mounted on the rotary member.
19. The work vehicle of claim 18, wherein the work portion includes a work arm connected to the swivel member and an excavating bucket connected to an end of the work arm distal from the swivel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920221364.0U CN210163954U (en) | 2019-02-22 | 2019-02-22 | Hydraulic system and engineering vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920221364.0U CN210163954U (en) | 2019-02-22 | 2019-02-22 | Hydraulic system and engineering vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210163954U true CN210163954U (en) | 2020-03-20 |
Family
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695265A (en) * | 2019-02-22 | 2019-04-30 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system and engineering truck |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695265A (en) * | 2019-02-22 | 2019-04-30 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system and engineering truck |
| CN109695265B (en) * | 2019-02-22 | 2023-12-15 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system and engineering vehicle |
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