AU2021100014A4 - Single pump source load port independent load sensitive energy saving hydraulic system of excavator - Google Patents
Single pump source load port independent load sensitive energy saving hydraulic system of excavator Download PDFInfo
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- AU2021100014A4 AU2021100014A4 AU2021100014A AU2021100014A AU2021100014A4 AU 2021100014 A4 AU2021100014 A4 AU 2021100014A4 AU 2021100014 A AU2021100014 A AU 2021100014A AU 2021100014 A AU2021100014 A AU 2021100014A AU 2021100014 A4 AU2021100014 A4 AU 2021100014A4
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Abstract
The present invention discloses a single pump source load port independent load-sensitive
energy-saving hydraulic system of an excavator. An oil inlet and an oil outlet of an executing
component are independently controlled by a load port independent valve; meanwhile, hydraulic
oil in the hydraulic system is recycled by an energy accumulator. According to the present
invention, the oil inlet and the oil outlet of the executing component can be independently
controlled, negative load energy can be recycled, the transmission efficiency of the excavator can
be improved, and fuel consumption can be reduced.
TFirst
oil tank
T A
Load port independent valve I
P T1
Executing _ One-a Firs sicing |
P valIve valve
One-wa valve A Load-sensitive Variable oil " Variable
vavecylinder LPump)
I |
One-way | '| iSecond |One-way Energy T
Valve lsichina valve valve accumulator
I A
Second oil
Energy tank
accumulator
FIG. 1
1/4
Description
oil tank TFirst T A Load port independent valve I P T1
Executing _ One-a Firs sicing | P valIve valve
One-wa valve A Load-sensitive Variable oil " Variable vavecylinder LPump) I | One-way | '| iSecond |One-way Energy T Valve lsichina valve valve accumulator I A Second oil Energy tank accumulator
FIG. 1
1/4
The present invention relates to a hydraulic system of an excavator, particularly relates to a
single pump source load port independent load-sensitive energy-saving hydraulic system of an
excavator, and belongs to the field of hydraulic energy saving.
The excavator is an earth-moving machine that excavates materials such as soil, coal, silt or
rocks and the like by buckets and loads the materials into vehicles or unloads the materials to
stockyards. At present, the excavator has become one of the most important engineering machines
in the engineering construction. However, the existing excavator has the problems of high energy
consumption, poor emission and low efficiency of the hydraulic transmission system. Under the
background that human society requires higher and higher requirements on energy conservation
and environmental projection, it is more and more necessary to improve.
In the working process of the hydraulic excavator, there are always negative load conditions
and composite action conditions, and the negative load is wasted in the form of throttling, leading
to the rise of the temperature of the hydraulic oil, so it is necessary to increase additional
heat-dissipating equipment and increase energy consumption. At present, the oil inlet and the oil
return opening of the reversing valve cannot be controlled independently, and the oil return
pressure loss is large, resulting in additional throttling loss.
For the above problems in the prior art, the present invention provides a single pump source
load port independent load-sensitive energy-saving hydraulic system of an excavator, so that an
oil inlet and an oil outlet of an executing component can be independently controlled, the negative
load energy can be recycled and energy can be saved.
To achieve the above objective, the present invention provides a single pump source load port
independent load-sensitive energy-saving hydraulic system of an excavator, including an
executing component, a load port independent valve, an energy accumulator, an energy accumulator controller valve, a variable oil cylinder, a variable pump and a load-sensitive valve, wherein the executing component is connected to a port Al of the load-sensitive valve through a one-way valve, a port B of the load-sensitive valve communicates with a rodless cavity of the variable oil cylinder, a piston rod of the variable oil cylinder is connected to an adjusting rod of the variable pump, an oil inlet of the variable pump is connected to a second oil tank through a one-way valve and is connected to a port T of the energy accumulator control valve through a second switching valve, an oil outlet of the variable pump is respectively connected to a port P and a port A of the load-sensitive valve, a port P of the load port independent valve and one end of a first switching valve through one-way valves, the other end of the first switching valve is connected to a port P of the energy accumulator control valve through a one-way valve, and a port
A of the energy accumulator control valve is connected to the energy accumulator; and a port A of
the load independent valve is connected to the executing component, a port T of the load port
independent valve is connected to a first oil tank, a port TI of the load port independent valve is
connected to the port P of the energy accumulator control valve, and a port P1 is connected to the
port T of the energy accumulator control valve.
Compared with the prior art, the single pump source load port independent load-sensitive energy-saving hydraulic system of the excavator according to the present invention adopts a load port independent control hydraulic power system to independently control an oil inlet and an oil outlet of the executing component, thereby improving control flexibility, reducing pressure loss of a valve port during control of the traditional multi-way valve, improving transmission efficiency, recycling rotation kinetic energy and movable arm falling energy and improving the efficiency of the hydraulic system. The present invention adopts a load-sensitive pump to ensure constant pressure difference of the load port independent valve, so that flow distribution is unrelated to the load, better power matching is realized, and the efficiency of the hydraulic system of the whole excavator is improved.
FIG. 1 is a functional block diagram of a hydraulic system according to the present invention; FIG. 2 is a schematic diagram of a hydraulic system according to an embodiment of the present invention;
FIG. 3 is a partial enlarged view of a portion A in FIG. 1;
FIG. 4 is a partial enlarged view of a portion B in FIG. 1;
FIG. 5 is a schematic diagram of a switching valve according to the present invention;
FIG. 6 is a schematic diagram of a load port independent valve according to the present
invention; and
FIG. 7 is a schematic diagram of an energy accumulator according to the present invention.
In the drawings: 1. Movable arm hydraulic cylinder, 2. Bucket rod hydraulic cylinder, 3.
Rotary hydraulic motor, 4. first-stage energy accumulator, 5. second-stage energy accumulator, 6.
third-stage energy accumulator, 7. Energy accumulator controller valve, 8. second switching valve,
9. First switching valve, 10. First oil tank, 11, second oil tank, 12, variable pump, 13. Variable oil
cylinder, 14, load-sensitive valve, 15. Bucket hydraulic cylinder.
The present invention will be further described below with reference to the accompanying
drawings.
As shown in FIG. 1 to FIG. 4, the present invention provides a single pump source load port
independent load-sensitive energy-saving hydraulic system of an excavator, including an
executing component, a load port independent valve, an energy accumulator, an energy
accumulator controller valve 7, a variable oil cylinder 13, a variable pump 12 and a load-sensitive
valve 14,
wherein the executing component is connected to a port Al of the load-sensitive valve 14
through a one-way valve, a port B of the load-sensitive valve 14 communicates with a rodless
cavity of the variable oil cylinder 13, a piston rod of the variable oil cylinder 13 is connected to an
adjusting rod of the variable pump 12, an oil inlet of the variable pump 12 is connected to a
second oil tank 11 through a one-way valve and is connected to a port T of the energy
accumulator control valve 7 through a second switching valve 8, an oil outlet of the variable
pump 12 is respectively connected to a port P and a port A of the load-sensitive valve 14, a port P
of the load port independent valve and one end of a first switching valve 9 through one-way
valves, the other end of the first switching valve 9 is connected to a port P of the energy accumulator control valve 7 through a one-way valve, and a port A of the energy accumulator control valve 7 is connected to the energy accumulator; and a port A of the load independent valve is connected to the executing component, a port T of the load port independent valve is connected to a first oil tank 10, a port T of the load port independent valve is connected to the port P of the energy accumulator control valve 7, and a port P1 is connected to the port T of the energy accumulator control valve 7.
In the specific embodiment, the executing component includes a movable arm hydraulic
cylinder 1, a bucket rod hydraulic cylinder 2, a rotary cylindrical motor 3 and a bucket hydraulic
cylinder 15; the energy accumulator includes a first-stage energy accumulator 4, a second-stage
energy accumulator 5 and a third-stage energy accumulator 6; the load port independent valve
includes load port independent valves Fl, F2, F3, F4, F5, F6, F7 and F8; the one-way valve
includes one-way valves Cl, C2, C3, C4, C5, C6, C7, C8, C9, C1O, Cli, C12, C15, C16, C17,
C18, C19, C20, C21, C22 and C23; and the first switching valve and the second switching valve
are two-position two-way switching valves.
As shown in FIG. 2 to FIG. 7, a rod cavity of the movable hydraulic cylinder 1 is connected
to oil inlets of the one-way valve Cl and C7 as well as a port A of the load port independent valve
F1 respectively; a rodless cavity of the movable arm hydraulic cylinder 7 is connected to oil inlets
of the one-way valves C2 and C8 as well as a port A of the load port independent valve F2
respectively;
a rod cavity of the bucket rod hydraulic cylinder 2 is connected to oil inlets of the one-way
valves C9 and C15 as well as a port A of the load port independent valve F3 respectively; a
rodless cavity of the bucket rod hydraulic cylinder 2 is connected to oil inlets of the one-way
valves C10 and C16 as well as a port A of the load port independent valve F4;
a port ml of the rotary hydraulic motor 3 is connected to oil inlets of the one-way valves C5
and Ci as well as a port A of the load port independent valve F5; a port m2 of the rotary
hydraulic motor 3 is connected to oil inlets of the one-way valves C6 and C12 as well as a port A
of the load port independent valve F6;
a rod cavity of the bucket hydraulic cylinder 15 is connected to oil inlets of the one-way
valves C3 and C17 as well as a port A of the load port independent valve F7 respectively; a rodless cavity of the bucket hydraulic cylinder 15 is connected to oil inlets of the one-way valves
C4 and C18 as well as a port A of the load port independent valve F8 respectively;
oil outlets of the one-way valves Cl, C2, C3, C4, C5, C6, C15 and C16 are connected to a
port Al of the load-sensitive valve 14; oil outlets of the one-way valves C7, C8, C9, C1O, CI1,
C12, C17 and C18 are connected to oil inlets of the one-way valves C19, C20 and C21
respectively, and oil outlets of the one-way valves C19, C20 and C21 are connected to a port P of
the energy accumulator control valve 7 respectively;
ports T of the load port independent valves F, F2, F3, F4, F5, F6, F7 and F8 are connected to
the first oil tank 10, ports P of the load port independent valves Fl, F2, F3, F4, F5, F6, F7 and F8
are connected to an oil outlet of the variable pump 12 through the one-way valve C22, ports Ti of
the load port independent valves F, F2, F3, F4, F5, F6, F7 and F8 are connected to oil inlets of
the one-way valves C7, C8, C9, C1O, Ci1, C12, C17 and C18 respectively, and ports P1 of the
load port independent valves F, F2, F3, F4, F5, F6, F7 and F8 are connected to a port T of the
energy accumulator control valve 7;
an oil inlet of the variable pump 12 is connected to a second oil tank through the one-way
valve C23 and is connected to a port T of the energy accumulator control valve 7; the oil outlet of
the variable pump 12 is connected to the oil inlet of the one-way valve C22, and the oil outlet of
the one-way valve C22 is connected to the oil inlets of the one-way valves C19, C20 and C21
through the first switching valve 9 respectively; and
a port A and a port P of the load-sensitive valve 14 are connected to the oil outlet of the
one-way valve C22, a port B of the load-sensitive valve 14 is connected to a rodless cavity of the
variable oil cylinder 13, a piston rod of the variable oil cylinder 13 is connected to an adjusting
rod of the variable pump 12, a port Al of the load-sensitive valve 14 is configured to acquire
maximum pressure values of oil openings of the movable arm hydraulic cylinder 1, the bucket rod
hydraulic cylinder, the bucket hydraulic cylinder 15 and the rotary hydraulic motor 3, and a port A
of the load-sensitive valve 14 is configured to acquire a pressure value of the oil outlet of the
variable pump 12.
The one-way valves C1, C2, C3, C4, C5, C6, C15 and C16 perform pressure selection, select
the maximum pressure values of two oil openings of the movable arm hydraulic cylinder 1, the bucket rod hydraulic cylinder 2, the bucket hydraulic cylinder 15 and the rotary hydraulic motor 8 and feed back the maximum pressure values to the load-sensitive valve 14. The load-sensitive valve 14 compares the maximum pressure value of the load and the outlet pressure value of the variable pump 12, so that the outlet pressure value of the variable pump 12 is higher than the maximum pressure value of the load by a constant value, and the value is adjusted by a spring of the load-sensitive valve 14, thereby realizing a load-sensitive hydraulic system.
The first-stage energy accumulator 4, the second-stage energy accumulator 5 and the
third-stage energy accumulator 6 realize three-stage pressure setting and energy storage. The
one-way valves C19, C20 and C21 realize one-way flow of energy recycling hydraulic oil of the
energy accumulator and realize energy storage. The first switching valve 8 realizes opening and
closing of pressure of the oil inlet of the variable pump 12 controlling pressure oil supply of the
energy accumulator. When the first switching valve 8 is opened, the oil inlet of the variable pump
12 is pressurized, thereby increasing the pressure of the oil outlet of the variable pump 12,
reducing the driving torque of an engine and realizing an acceleration function.
As shown in FIG. 6, the port A of the load port independent valve is configured to be
connected to oil openings of the executing components(that is, the movable arm hydraulic
cylinder 1, the bucket rod hydraulic cylinder 2, the bucket hydraulic cylinder 15 and the rotary
hydraulic motor 3), the port P is configured to be connected to high-pressure oil of the variable
pump 12, the port T is configured to be connected to the first oil tank 10, the port P1 is configured
to be connected to the port T of the energy accumulator control valve 7, the port TI is configured
to be connected to the oil inlet of the energy accumulator, and the oil openings are all closed when
the load port independent valve is at a middle position.
When the load port independent valve works at a right position, the port A and the T port of
the load port independent valves communicate with each other, the oil openings of the executing
components are connected to the first oil tank 10, so that the oil return function is realized.
Meanwhile, if the returned oil is pressurize and the pressure is higher than the pressure of the
energy accumulator or it is under the negative load condition, the negative load energy is recycled
into the energy accumulator.
When the load port independent valve works at a left position, the port A and the port P of
the load port independent valve communicate with each other, the oil openings of the executing components are connected to the oil outlet of the variable pump 12, and pressure oil of the variable pump 12 enters the oil openings of the executing components, thus driving the executing components to act. Meanwhile, the pressure oil of the energy accumulator intervenes through the port P1 of the load port independent valve. When the pressure of the energy accumulator is greater than the pressure of the oil outlet of the variable pump 12, the executing components are driven by the pressure of the energy accumulator. When the pressure of the energy accumulator is less than the pressure of the oil outlet of the variable pump 12, the second switching valve 8 is opened, as shown in FIG. 2. When the second switching valve 8 works at the right position, the pressure of the energy accumulator is supplied to the oil inlet of the variable pump 12, thus completely utilizing the energy of the energy accumulator.
The first switching valve 9 is configured to control oil filling of the energy accumulator. The
energy accumulator is actively pressurized under the standby working condition or under the
condition of rich engine power, so that active power storage is realized and waste of power of the
whole machine is reduced.
The movable arm hydraulic cylinder 1 independently controls two oil openings of the load
port independent valves Fl and F2. When the movable arm extends out, the rodless cavity
communicates with the rod cavity to realize differential motion, thereby increasing the arm lifting
speed. At this time, the load port independent valve F2 controls the port A to communicate with
the port P, the rodless cavity of the movable arm hydraulic cylinder 1 is connected to a
high-pressure pipeline; meanwhile, the load port independent valve Fl controls the port A to
communicate with the port P, the rod cavity of the movable arm hydraulic cylinder 1 is connected
to the high-pressure pipeline, and pressure oil of the rod cavity of the movable arm oil cylinder 1
flows to the rodless cavity, thereby realizing differential connection and increasing the extension
speed of the movable arm hydraulic cylinder 1. When the movable arm falls, the pressure oil of
the rodless cavity of the movable arm hydraulic cylinder 1 unidirectionally flows to the energy
accumulator when passing through the one-way valve C8, thus recycling gravitational potential
energy when the arm falls. When the arm is lifted, the load port independent valve F2 controls the
port A to communicate with the port P1, and the rodless cavity of the movable arm hydraulic
cylinder 1 is connected to the energy accumulator, thereby lifting the arm by the energy of the
energy accumulator.
The movable arm hydraulic cylinder 2 independently controls two oil openings of the load
port independent valves Fl and F2. When the movable arm extends out, the rodless cavity
communicates with the rod cavity to realize differential motion, thereby increasing the arm lifting
speed. At this time, the load port independent valve F2 controls the port A to communicate with
the port P, the rodless cavity of the movable arm hydraulic cylinder 2 is connected to a
high-pressure pipeline; meanwhile, the load port independent valve Fl controls the port A to
communicate with the port P, the rod cavity of the movable arm hydraulic cylinder 1 is connected
to the high-pressure pipeline, and pressure oil of the rod cavity of the movable arm oil cylinder 2
flows to the rodless cavity, thereby realizing differential connection and increasing the extension
speed of the movable arm hydraulic cylinder 2. When the bucket rod swings downwards, the
pressure oil of the rod cavity of the bucket rod hydraulic cylinder 2 unidirectionally flows to the
energy accumulator through the one-way valve C9, thereby recycling gravitational potential
energy when the bucket rod swings downwards. When the bucket rod swings upwards, the load
port independent valve F3 controls the port A to communicate with the port P1 and the rod cavity
of the bucket rod hydraulic cylinder 2 is connected to the energy accumulator, thereby swinging
upwards by the energy of the energy accumulator.
The bucket hydraulic cylinder 15 independently controls the two oil openings by the load
port independent valves F7 and F8. During excavation, the load port independent valve F7 control
the rodless cavity of the bucket hydraulic cylinder 15 to be connected to the first oil tank 10, and
the load port independent valve F8 controls the rod cavity of the bucket hydraulic cylinder 15 to
be connected to outlet pressure of the variable pump 12. During unloading, the load port
independent valve F7 controls the rodless cavity of the bucket hydraulic cylinder 15 to be
connected to outlet pressure of the variable pump 12, and the load port independent valve F8
controls the rod cavity of the bucket hydraulic cylinder 15 to be connected to the first oil tank 10.
The load port independent valves F5 and F6 controls rotation of the rotary hydraulic motor 3,
and may independently control an oil path connection relationship between the port ml and the
port m2 of the rotary hydraulic motor 3. During start, the load port independent valve F5 controls
the port A and the port P to communicate with each other, the port ml of the rotary hydraulic
motor 3 is connected to a high-pressure oil path of the variable pump 12 and may be connected to
a high-pressure oil path of the energy accumulator according to the working condition, that is, the load port independent valve F5 controls the port A and the port P1 to communicate with each other, and the port ml of the rotary hydraulic motor 3 is connected to the port T of the energy accumulator control valve 7, thereby realizing rotary start by the pressure of the energy accumulator. When the high-pressure oil path of the energy accumulator is connected, the load port independent valve F6 controls the port A and the port T to communicate with each other, and the port m2 of the rotary hydraulic motor 3 is connected to the first oil tank 10. Under the braking condition, the load port independent valve F5 controls the port A and the port T to communicate with each other to connect the port ml of the rotary hydraulic motor 3 to the first oil tank 10, the load port independent valve F6 controls the port A and the port P1 to communicate with each other, the port m2 of the hydraulic motor 3 is connected to the oil inlet of the energy accumulator
(that is, connected to the port P of the energy accumulator control valve 7), and the one-way
valves C11 and C12 control the pressure oil only to flow to the energy accumulator, thereby
avoiding inversion under the action of the pressure oil, realizing auxiliary start of the energy
accumulator during rotary action and energy recovery during braking, and improving the
efficiency of the hydraulic cylinder.
In this embodiment, energy recovery and recycling are realized by the three-stage energy
accumulators. For simplicity, the number of the energy accumulators may be reduced. And more
energy accumulators may be added for finer pressure division.
Claims (14)
1. A single pump source load port independent load-sensitive energy-saving hydraulic system
of an excavator, comprising an executing component, a load port independent valve, an energy
accumulator, an energy accumulator controller valve, a variable oil cylinder, a variable pump and
a load-sensitive valve,
wherein the executing component is connected to a port Al of the load-sensitive valve
through a one-way valve, a port B of the load-sensitive valve communicates with a rodless cavity
of the variable oil cylinder, a piston rod of the variable oil cylinder is connected to an adjusting
rod of the variable pump, an oil inlet of the variable pump is connected to a second oil tank
through a one-way valve and is connected to a port T of the energy accumulator control valve
through a second switching valve, an oil outlet of the variable pump is respectively connected to a
port P and a port A of the load-sensitive valve, a port P of the load port independent valve and one
end of a first switching valve through one-way valves, the other end of the first switching valve is
connected to a port P of the energy accumulator control valve through a one-way valve, and a port
A of the energy accumulator control valve is connected to the energy accumulator; and a port A of
the load independent valve is connected to the executing component, a port T of the load port
independent valve is connected to a first oil tank, a port TI of the load port independent valve is
connected to the port P of the energy accumulator control valve, and a port P1 is connected to the
port T of the energy accumulator control valve.
2. The single pump source load port independent load-sensitive energy-saving hydraulic
system of the excavator according to claim 1, wherein the executing component comprises a
movable arm hydraulic cylinder, a bucket rod hydraulic cylinder, a rotary cylindrical motor and a
bucket hydraulic cylinder; the energy accumulator comprises a first-stage energy accumulator, a
second-stage energy accumulator and a third-stage energy accumulator; each energy accumulator
is connected to one energy accumulator control valve; the load port independent valve comprises
load port independent valves Fl, F2, F3, F4, F5, F6, F7 and F8; the one-way valve comprises
one-way valves C1, C2, C3, C4, C5, C6, C7, C8, C9, C
10, C11, C12, C15, C16, C17, C18, C19,
C20, C21, C22 and C23;
a rod cavity of the movable arm hydraulic cylinder is connected to oil inlets of the one-way valves C1 and C7 as well as a port A of the load port independent valve F1 respectively; and the rodless cavity of the movable arm hydraulic cylinder is connected to oil inlets of the one-way valves C2 and C8 as well as a port A of the load port independent valve F2; a rod cavity of the bucket rod hydraulic cylinder is connected to oil inlets of the one-way valves C9 and C15 as well as a port A of the load port independent valve F3 respectively; and a rodless cavity of the bucket rod hydraulic cylinder is connected to oil inlets of the one-way valves
C10 and C16 as well as a port A of the load port independent valve F4;
a port ml of the rotary hydraulic motor is connected to oil inlets of the one-way valves C5
and C11 as well as a port A of the load port independent valve F5; a port m2 of the rotary
hydraulic motor is connected to oil inlets of the one-way valves C6 and C12 as well as a port A of
the load port independent valve F6;
a rod cavity of the bucket hydraulic cylinder is connected to oil inlets of the one-way valves
C3 and C17 as well as a port A of the load port independent valve F7 respectively; a rodless
cavity of the bucket hydraulic cylinder is connected to oil inlets of the one-way valves C4 and
C18 as well as a port A of the load port independent valve F8;
oil outlets of the one-way valves Cl, C2, C3, C4, C5, C6, C15 and C16 are connected to a
port Al of the load-sensitive valve; oil outlets of the one-way valves C7, C8, C9, C10, C
11, C12,
C17 and C18 are connected to oil inlets of the one-way valves C19, C20 and C21 respectively,
and oil outlets of the one-way valves C19, C20 and C21 are connected to a port P of the energy
accumulator control valve respectively;
ports T of the load port independent valves Fl, F2, F3, F4, F5, F6, F7 and F8 are connected to
the first oil tank, ports P of the load port independent valves F, F2, F3, F4, F5, F6, F7 and F8 are
connected to an oil outlet of the variable pump through the one-way valve C22, ports T1 of the
load port independent valves F, F2, F3, F4, F5, F6, F7 and F8 are connected to oil inlets of the
one-way valves C7, C8, C9, C1O, C11, C
12, C17 and C18 respectively, and ports P1 of the load
port independent valves F, F2, F3, F4, F5, F6, F7 and F8 are connected to a port T of the energy
accumulator control valve;
an oil inlet of the variable pump is connected to the second oil tank through the one-way valve C23 and is connected to a port T of the energy accumulator control valve through the second switching valve; the oil outlet of the variable pump is connected to an oil inlet of the one-way C22, and an oil outlet of the one-way C22 is connected to oil inlets of the one-way valves C19, C20 and C21 respectively through the first switching valve; and a port A and a port P of the load-sensitive valve are connected to the oil outlet of the one-way valve C22.
First oil tank
Load port independent valve
Executing One-way First switching 2021100014
component valve valve
One-way valve Load-sensitive Variable oil Variable valve cylinder pump
One-way Second One-way Energy valve switching valve valve accumulator control valve Second oil Energy tank accumulator
FIG. 1
1/4
C1 P1 P A
T F1 T1
C7
C8 P A C2 T F2 T1 2021100014
P1
C3 P1 C15 15 A F7 T
T1 P 2 P1 C17 P A
T F3 T1 C18 A T C9 F8 T1 P P1 C10 C4 P A
T F4 P1 T1
C16
C5 P1 P A F5 T1 C6 T
C11 m
1 3 C12 m2 T1 P F6 T P1 A 4 P T C20 A1 C19 C21 5 A 6 B C22 7
14 C23
11 10 13 12 9 8 FIG. 2
2/4
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011548461.4 | 2020-12-24 | ||
| CN202011548461 | 2020-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021100014A4 true AU2021100014A4 (en) | 2021-03-18 |
Family
ID=75093565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021100014A Ceased AU2021100014A4 (en) | 2020-12-24 | 2021-01-03 | Single pump source load port independent load sensitive energy saving hydraulic system of excavator |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2021100014A4 (en) |
-
2021
- 2021-01-03 AU AU2021100014A patent/AU2021100014A4/en not_active Ceased
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