CN109899329A - A kind of Ioad-sensing control mechanism and hydraulic system - Google Patents
A kind of Ioad-sensing control mechanism and hydraulic system Download PDFInfo
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- CN109899329A CN109899329A CN201910248082.4A CN201910248082A CN109899329A CN 109899329 A CN109899329 A CN 109899329A CN 201910248082 A CN201910248082 A CN 201910248082A CN 109899329 A CN109899329 A CN 109899329A
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Abstract
The invention belongs to technical field of hydraulic pressure, a kind of Ioad-sensing control mechanism and hydraulic system are disclosed.The Ioad-sensing control mechanism, including interconnected main pump in-line, working hole and main oil return line, the hydraulic oil in main pump in-line is back in main oil return line through working hole；Pressure compensator, both ends are respectively communicated in main pump in-line and working hole, and pressure compensator can be adjusted into its internal hydraulic fluid flow rate；First secondary oil return line, both ends are respectively communicated in working hole and main oil return line；Electric proportional pressure control valve, it is set on the first secondary oil return line, the inlet communication of electric proportional pressure control valve is in the guide end of pressure compensator, and the flow pressure and the sum of the spring pressure of pressure compensator of electric proportional pressure control valve act on one end of the spool of pressure compensator, the inlet pressure of pressure compensator acts on the other end of the spool of pressure compensator.The Ioad-sensing control mechanism controls working hole pressure in the case where no flow wastes, to reduce production cost.
Description
Technical field
The present invention relates to technical field of hydraulic pressure more particularly to a kind of Ioad-sensing control mechanisms and hydraulic system.
Background technique
Working hole is arranged overflow valve on the oil return line of working hole, works as work for being connected to external loading in hydraulic system
Make mouth pressure be greater than overflow valve rated pressure when, overflow valve open carry out pressure release, to control the work of entire hydraulic system
Pressure.
Although existing control mode can control the pressure of working hole, but extra flow can be flowed out by overflow valve
System, excess traffic will cause energy dissipation, while this control mode cannot be according to the oil pressure of oil return line, timely adjustment work
The oil pressure of mouth import is unfavorable for realizing the dynamic regulation of pressure, so that degree of regulation is lower.
Summary of the invention
The purpose of the present invention is to provide a kind of Ioad-sensing control mechanism and hydraulic systems, for reducing energy dissipation,
Realize that the dynamic regulation of pressure, control precision are higher.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of Ioad-sensing control mechanism, including interconnected main pump in-line, working hole and main oil return line, the master
Hydraulic oil in pump in-line is back in the main oil return line through the working hole, which is characterized in that further include:
Pressure compensator, both ends are respectively communicated in the main pump in-line and the working hole, the pressure compensator
It can adjust into its internal hydraulic fluid flow rate；
First secondary oil return line, both ends are respectively communicated in the working hole and the main oil return line；
Electric proportional pressure control valve is set on the described first secondary oil return line, the inlet communication of the electricity proportional pressure control valve in
The guide end of the pressure compensator, it is described electricity proportional pressure control valve flow pressure and the pressure compensator spring pressure it
With the one end for the spool for acting on the pressure compensator, the inlet pressure of the pressure compensator acts on the pressure compensation
The other end of the spool of device.
Preferably, the Ioad-sensing control mechanism further includes load-sensitive oil circuit and the second secondary oil return line, described second
Secondary oil return line is located at the upstream of the described first secondary oil return line, the described second secondary oil return line both ends be respectively communicated in the working hole and
The load-sensitive oil circuit.
Preferably, being provided with check valve on the described second secondary oil return line.
Preferably, the preset pressure of the check valve is greater than the preset pressure of the electric proportional pressure control valve.
Preferably, the preset pressure of the check valve is 80N, the preset pressure of the electricity proportional pressure control valve is 50N.
Preferably, the Ioad-sensing control mechanism further includes reversal valve, the reversal valve is located at the pressure compensator
Between the working hole, the oil return line of the reversal valve is respectively communicated in the described first secondary oil return line and the second secondary oil return
Road.
Preferably, the Ioad-sensing control mechanism further includes controller, the controller is connected to the reversal valve
The both ends of spool, for controlling the movement of the reversal valve.
Preferably, the Ioad-sensing control mechanism further includes third pair oil return line, the both ends of the third pair oil return line
It is respectively communicated in the working hole and the main oil return line.
Preferably, being provided with port overflow valve on the third pair oil return line.
In order to achieve the above object, the present invention also provides a kind of hydraulic system, including above-mentioned Ioad-sensing control mechanism.
Beneficial effects of the present invention:
Ioad-sensing control mechanism provided by the invention, oil return of the hydraulic oil after working hole in main pump in-line are divided into
Two branches, wherein a branch is directly back in main oil return line, in addition a branch is that working hole passes through the first secondary oil return
Road is connected to main oil return line, and electric proportional pressure control valve is arranged on the first secondary oil return line, connects the import of electric proportional pressure control valve respectively
The oil return line and pressure compensator of working hole are passed through, electric proportional pressure control valve is used to control the maximum pressure of entire mechanism.Electric ratio
The sum of flow pressure and the spring pressure of pressure compensator of overflow valve act on one end of the spool of pressure compensator, and pressure is mended
Repay device inlet pressure act on pressure compensator spool the other end, enable pressure compensator spool opening according to
The variation of actual pressure and change, cooperated by electric proportional pressure control valve and pressure compensator, make electric proportional pressure control valve
Flow pressure and the sum of the spring pressure of pressure compensator and the inlet pressure of pressure compensator keep balancing.
When pressure compensator outlet pressure has the trend higher than default pressure, load-sensitive electricity proportional pressure control valve
Limitation whole system pressure is continued to rise, and the pressure of main pump in-line will continue to rise, when the two pressure difference is enough to overcome
When the spring pressure of pressure compensator itself, pressure compensator carries out hydraulic fluid flow rate adjusting, prevents or reduce main pump in-line
Hydraulic oil working hole is entered by pressure compensator, to inhibit whole system further rise in pressure, pass through pressure compensation
The dynamic compensation function of device itself makes the pressure of the outlet side of pressure compensator be not above default pressure, Bu Huishou always
To the interference of external loading, the dynamic regulation of pressure is realized.By the control to electric proportional pressure control valve, work can be flexibly controlled
The pressure of mouth, control precision is higher, wastes at this time without excess traffic, can save energy to greatest extent, not have it
Added flow controls working hole pressure in the case where wasting, to reduce production cost.
The present embodiment additionally provides a kind of hydraulic system, including above-mentioned Ioad-sensing control mechanism.The hydraulic system is logical
Cross the electric proportional pressure control valve of setting, for being adjusted to hydraulic fluid flow rate in hydraulic system, can accurately, neatly control hydraulic circuit
The pressure of middle work makes it realize the control of working hole pressure in the case where no added flow wastes, to reach reduction energy
Measure the purpose of loss.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Ioad-sensing control mechanism of the present invention；
Fig. 2 is schematic diagram of the Ioad-sensing control mechanism of the present invention in working condition.
In figure:
100, main pump in-line；200, main oil return line；300, load-sensitive oil circuit；400, low pressure auxiliary pump oil circuit；500,
Low pressure oil return line；
1, working hole；2, pressure compensator；3, the first secondary oil return line；4, electric proportional pressure control valve；5, the second secondary oil return line；6,
Check valve；7, reversal valve；8, controller；9, third pair oil return line；10, port overflow valve；
11, the first working hole；12, the second working hole.
Specific embodiment
To keep the technical problems solved, the adopted technical scheme and the technical effect achieved by the invention clearer, below
It will the technical scheme of the embodiment of the invention will be described in further detail in conjunction with attached drawing, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
In the description of the present invention unless specifically defined or limited otherwise, term " connected ", " connection ", " fixation " are answered
It is interpreted broadly, for example, it may be being fixedly connected, may be a detachable connection, or is integral；It can be mechanical connection,
It can be electrical connection；It can be directly connected, the company inside two elements can also be can be indirectly connected through an intermediary
Logical or two elements interaction relationship.For the ordinary skill in the art, can be understood with concrete condition above-mentioned
The concrete meaning of term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.And fisrt feature includes fisrt feature above the second feature " above ", " above " and " above "
Right above second feature and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature is
Two features " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
One characteristic level height is less than second feature.
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
A kind of Ioad-sensing control mechanism is present embodiments provided, Hydraulic Field is primarily adapted for use in, as shown in Figure 1, this is negative
Sensitive control mechanism is carried to include interconnected main pump in-line 100, working hole 1, main oil return line 200, pressure compensator 2, change
To the secondary oil return line 3 of valve 7, first and electric proportional pressure control valve 4, wherein main pump in-line 100 is specifically identified P, and main oil return line 200 identifies
T, working hole 1 specifically include the first working hole 11 and the second working hole 12, the both ends of pressure compensator 2 be respectively communicated in main pump into
Oil circuit 100 and the first working hole 1, reversal valve 7 make in main pump in-line 100 between pressure compensator 2 and working hole 1
Hydraulic oil from P mouthfuls enter pressure compensator 2 after, the first working hole 11 is entered by reversal valve 7, to be connected to working hole 1
Logical external loading provides hydraulic oil, and last hydraulic oil is back to main oil return line 200 by reversal valve 7 through the second working hole 12
It is interior.
First secondary oil return line 3 is connected with the oil return line of reversal valve 7, make the both ends of the first pair oil return line 3 be respectively communicated in
Working hole 1 and main oil return line 200 are provided with electric proportional pressure control valve 4, the import of electric proportional pressure control valve 4 on the first secondary oil return line 3
It is connected to the guide end of pressure compensator 2, the flow pressure of electric proportional pressure control valve 4 and the sum of the spring pressure of pressure compensator 2
Equal to the inlet pressure of pressure compensator 2, pressure compensator 2 can adjust the hydraulic fluid flow rate into its inside, for realizing
Dynamic pressure is adjusted, and wherein pressure compensator 2 is specially two-position three-way valve.The flow pressure and pressure of electric proportional pressure control valve 4 are mended
The sum of the spring pressure for repaying device 2 acts on one end of the spool of pressure compensator 2, and the inlet pressure of pressure compensator 2 acts on
The other end of the spool of pressure compensator 2, so that the opening of the spool of pressure compensator 2 can be sent out according to the variation of actual pressure
Changing.Return pressure and external loading for working hole 1 have larger association, and the return pressure of working hole 1 is introduced pressure
The guide end of force compensating device 2, so that the input pressure of the return pressure and pressure compensator 2 reaches balance, to be passed through commutation
Hydraulic oil in valve 7 is kept constant, and since the valve port opening of reversal valve 7 changes, flow also changes therewith, therefore, changes when being passed through
When hydraulic oil into valve 7 is kept constant, the flow for entering the first working hole 11 through reversal valve 7 not will receive the dry of external loading
It disturbs.
Ioad-sensing control mechanism provided in this embodiment, the hydraulic oil in main pump in-line 100 is through the second working hole 12
Oil return afterwards is divided into two branches, wherein a branch is directly back in main oil return line 200, in addition a branch is working hole
1 is connected to main oil return line 200 by the first secondary oil return line 3, and electric proportional pressure control valve 4 is arranged on the first secondary oil return line 3, makes electric ratio
The import of example overflow valve 4 is respectively communicated with oil return line and pressure compensator 2 in reversal valve 7, and electric proportional pressure control valve 4 is whole for controlling
The maximum pressure of a mechanism.It is cooperated by electric proportional pressure control valve 4 and pressure compensator 2, makes the flow of electric proportional pressure control valve 4
The inlet pressure of the sum of spring pressure of pressure and pressure compensator 2 and pressure compensator 2 keeps balancing.
When 2 outlet pressure of pressure compensator has the trend higher than default pressure, load-sensitive electricity proportional overflow
Valve 4 continues to rise by whole system pressure is limited, and the pressure of main pump in-line 100 will continue to rise, when the two pressure difference foot
When spring pressure to overcome pressure compensator 2 itself, pressure compensator 2 carries out hydraulic fluid flow rate adjusting, prevents or reduce master
The hydraulic oil for pumping in-line 100 enters working hole 1 by pressure compensator 2, thus inhibit whole system further rise in pressure,
The pressure of the outlet side of pressure compensator 2 is set to be not above system always by the dynamic compensation function of pressure compensator 2 itself
Pressure is set, the interference of external loading is not will receive, realizes the dynamic regulation of pressure.By the control to electric proportional pressure control valve 4,
The pressure of working hole 1 can be flexibly controlled, control precision is higher, wastes, can save to greatest extent without excess traffic at this time
About energy makes it control 1 pressure of working hole in the case where no added flow wastes, to reduce production cost.
It should be strongly noted that the proportional pressure control valve itself does not need high-power off-load, it is only necessary to small dimension
Function can be realized in simple overflow valve, to realize electric proportional control.Using electric proportional pressure control valve 4 can system work in into
The adjustment of Mobile state pressure, structure is simple, and easy to use, versatility is stronger, convenient for meeting the needs of different operating conditions.
In order to further realize dynamic regulation, which further includes load-sensitive oil circuit 300 and second
Secondary oil return line 5, wherein load-sensitive oil circuit 300 is specifically identified LS, and the second secondary oil return line 5 is located at the upstream of the first secondary oil return line 3,
Second 5 both ends of secondary oil return line are respectively communicated in working hole 1 and load-sensitive oil circuit 300.Specifically, the first secondary oil return line 3 and the
Second mate's oil return line 5 is connected to working hole 1 by the oil return line of reversal valve 7, realizes using oil return line to the dynamic of pressure compensator 2
State is adjusted.
Further, optionally, it is provided with check valve 6 on the second secondary oil return line 5, the preset pressure of check valve 6 is greater than
The preset pressure of electric proportional pressure control valve 4.Preferably, the preset pressure of check valve 6 is 80N, the preset pressure of electric proportional pressure control valve 4
For 50N.
When the pressure of hydraulic oil in the oil return line of reversal valve 7 is greater than the preset pressure 80N of check valve 6, hydraulic oil is flowed through
Second secondary oil return line 5 is back in load-sensitive oil circuit 300 by check valve 6；When the pressure of hydraulic oil in the oil return line of reversal valve 7
When power is less than the preset pressure 80N of check valve 6, if the pressure of hydraulic oil is greater than the preset pressure 50N of electric proportional pressure control valve 4
When, hydraulic oil flows through the first secondary oil return line 3 and is back in main oil return line 200 by electric proportional pressure control valve 4；If the pressure of hydraulic oil
When power is less than the preset pressure 50N of electric proportional pressure control valve 4, hydraulic oil, which enters, is located at electric 4 import of proportional pressure control valve and pressure compensation
Pipeline between device 2, so that the section hydraulic oil acts directly on pressure compensator 2, the direction of the active force and pressure at this time
The direction of the spring pressure of force compensating device 2 is that straight up, and the inlet pressure direction of pressure compensator 2 is straight down, and two
Person is contrary, according to force balance principle, the flow pressure of electric proportional pressure control valve 4 and the spring pressure of pressure compensator 2
The sum of be equal to pressure compensator 2 inlet pressure.
Oil return for the second working hole 12, wherein a branch is directly back in main oil return line 200, it is straight in order to realize
It takes back and flow to main oil return line 200, which further includes third pair oil return line 9, the both ends of third pair oil return line 9
It is respectively communicated in working hole 1 and main oil return line 200.For the ease of the control to third pair oil return line 9, in third pair oil return line 9
On be provided with port overflow valve 10.
In order to control reversal valve 7, which further includes controller 8, low pressure auxiliary pump oil circuit
400 and low pressure oil return line 500, mesolow auxiliary pump oil circuit 400 be more specifically designated as PSP, low pressure oil return line 500 is more specifically designated as
T0, controller 8 are connected to the both ends of the spool of reversal valve 7, and controller 8 is used to control the movement of reversal valve 7, and controller 8 is distinguished
It is connected to low pressure auxiliary pump oil circuit 400 and low pressure oil return line 500.Wherein controller 8 can control to be long-range, preferably button etc.,
Realize the control to reversal valve 7.
The course of work of Ioad-sensing control mechanism provided in this embodiment:
Hydraulic oil in main pump in-line 100 from P mouthfuls enter pressure compensator 2 after, by controller 8 to reversal valve 7 into
Row control, makes reversal valve 7 be in operating position, then enters the first working hole 11 by reversal valve 7, with to work with first
The external loadings that mouth 11 is connected provide hydraulic oil.It is divided into three branch from the second working hole 12 by the oil return line that reversal valve returns
Road, wherein the first branch is directly back in main oil return line 200；Second branch: when the pressure of hydraulic oil in the oil return line of reversal valve 7
When power is greater than 80N, hydraulic oil flows through the second secondary oil return line 5 and is back in load-sensitive oil circuit 300 by check valve 6；Third branch
Road: when the pressure of hydraulic oil in the oil return line of reversal valve 7 is less than 80N, if the pressure of hydraulic oil is greater than 50N, hydraulic oil
The first secondary oil return line 3 is flowed through to be back in main oil return line 200 by electric proportional pressure control valve 4.When the pressure of hydraulic oil is less than 50N
When, hydraulic oil enters the pipeline being located between electric 4 import of proportional pressure control valve and pressure compensator 2, so that section hydraulic oil is straight
It connects and acts on pressure compensator 2, the direction of the spring pressure of the direction of the active force and pressure compensator 2 is vertical at this time
Upwards, and the inlet pressure direction of pressure compensator 2 straight down, the two is contrary, according to force balance principle, electric ratio
The inlet pressure of the sum of the flow pressure of example overflow valve 4 and the spring pressure of pressure compensator 2 and pressure compensator 2 keeps flat
Weighing apparatus.
The present embodiment additionally provides a kind of hydraulic system, including above-mentioned Ioad-sensing control mechanism.The hydraulic system is logical
Crossing the electric proportional pressure control valve 4 of setting can accurately, neatly control hydraulic time for adjusting to hydraulic fluid flow rate in hydraulic system
The pressure of working hole 1 in road makes it realize the control of 1 pressure of working hole in the case where no added flow wastes, can be most
Reduce energy loss to day of one's doom difficulty.
In the description of this article, it is to be understood that term " on ", "lower", " right side ", etc. orientation or positional relationships be based on
Orientation or positional relationship shown in the drawings is merely for convenience of description and simplification and operates, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to limit of the invention
System.In addition, term " first ", " second ", are only used to distinguish between description, have no special meaning.
In the description of this specification, the description of reference term " embodiment ", " example " etc. means to combine the embodiment
Or example particular features, structures, materials, or characteristics described are included at least one embodiment or example of the invention.?
In this specification, schematic expression of the above terms be may not refer to the same embodiment or example.
In addition, the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of Ioad-sensing control mechanism, including interconnected main pump in-line (100), working hole (1) and main oil return line
(200), the hydraulic oil in the main pump in-line (100) is back in the main oil return line (200) through the working hole (1),
It is characterized by further comprising:
Pressure compensator (2), both ends are respectively communicated in the main pump in-line (100) and the working hole (1), the pressure
Compensator (2) can be adjusted into its internal hydraulic fluid flow rate；
First secondary oil return line (3), both ends are respectively communicated in the working hole (1) and the main oil return line (200)；
Electric proportional pressure control valve (4) is set on the described first secondary oil return line (3), and the import of the electricity proportional pressure control valve (4) connects
Pass through the guide end of the pressure compensator (2), the flow pressure and the pressure compensator of the electricity proportional pressure control valve (4)
(2) the sum of spring pressure acts on one end of the spool of the pressure compensator (2), the import of the pressure compensator (2)
Pressure acts on the other end of the spool of the pressure compensator (2).
2. Ioad-sensing control mechanism according to claim 1, which is characterized in that the Ioad-sensing control mechanism further includes
Load-sensitive oil circuit (300) and the second secondary oil return line (5), the described second secondary oil return line (5) are located at the described first secondary oil return line (3)
Upstream, described second secondary oil return line (5) both ends are respectively communicated in the working hole (1) and the load-sensitive oil circuit (300).
3. Ioad-sensing control mechanism according to claim 2, which is characterized in that on the described second secondary oil return line (5)
It is provided with check valve (6).
4. Ioad-sensing control mechanism according to claim 3, which is characterized in that the preset pressure of the check valve (6)
Greater than the preset pressure of the electric proportional pressure control valve (4).
5. Ioad-sensing control mechanism according to claim 4, which is characterized in that the preset pressure of the check valve (6)
For 80N, the preset pressure of the electricity proportional pressure control valve (4) is 50N.
6. Ioad-sensing control mechanism according to claim 2, which is characterized in that the Ioad-sensing control mechanism further includes
Reversal valve (7), the reversal valve (7) is between the pressure compensator (2) and the working hole (1), the reversal valve (7)
Oil return line be respectively communicated in the described first secondary oil return line (3) and the second pair oil return line (5).
7. Ioad-sensing control mechanism according to claim 6, which is characterized in that the Ioad-sensing control mechanism further includes
Controller (8), the controller (8) is connected to the both ends of the spool of the reversal valve (7), for controlling the reversal valve (7)
Movement.
8. Ioad-sensing control mechanism according to claim 1, which is characterized in that the Ioad-sensing control mechanism further includes
The both ends of third pair oil return line (9), the third pair oil return line (9) are respectively communicated in the working hole (1) and the main oil return
Road (200).
9. Ioad-sensing control mechanism according to claim 8, which is characterized in that on the third pair oil return line (9)
It is provided with port overflow valve (10).
10. a kind of hydraulic system, which is characterized in that including the described in any item Ioad-sensing control mechanisms of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910248082.4A CN109899329B (en) | 2019-03-29 | 2019-03-29 | Load sensitive control mechanism and hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910248082.4A CN109899329B (en) | 2019-03-29 | 2019-03-29 | Load sensitive control mechanism and hydraulic system |
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| Publication Number | Publication Date |
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| CN109899329A true CN109899329A (en) | 2019-06-18 |
| CN109899329B CN109899329B (en) | 2021-05-18 |
Family
ID=66954030
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910248082.4A Active CN109899329B (en) | 2019-03-29 | 2019-03-29 | Load sensitive control mechanism and hydraulic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112555214A (en) * | 2020-12-10 | 2021-03-26 | 山东泰丰智能控制股份有限公司 | Three-port two-way constant pressure difference valve |
| CN113898619A (en) * | 2021-09-10 | 2022-01-07 | 中联重科股份有限公司 | Accumulator charging valve and hydraulic braking system |
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| CN108547821A (en) * | 2018-07-04 | 2018-09-18 | 北京奥腾岩石科技有限公司 | Integrated hydraulic course changing control valve group and fluid-link steering control system |
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| US20050072145A1 (en) * | 2003-10-01 | 2005-04-07 | Jervis Mark J. | Power conserving hydraulic pump bypass compensator circuit |
| CN103016438A (en) * | 2012-11-23 | 2013-04-03 | 武汉船用机械有限责任公司 | Electric-hydraulic proportion control valve set |
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| CN113898619A (en) * | 2021-09-10 | 2022-01-07 | 中联重科股份有限公司 | Accumulator charging valve and hydraulic braking system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109899329B (en) | 2021-05-18 |
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