CN112576557B - Reservoir water level hydraulic control system and use method thereof - Google Patents

Reservoir water level hydraulic control system and use method thereof Download PDF

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CN112576557B
CN112576557B CN202011564014.8A CN202011564014A CN112576557B CN 112576557 B CN112576557 B CN 112576557B CN 202011564014 A CN202011564014 A CN 202011564014A CN 112576557 B CN112576557 B CN 112576557B
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oil supply
unit
hydraulic
oil
supply branch
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CN112576557A (en
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谭罕
余海
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Sichuan Crun Co ltd
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Sichuan Crun Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/029—Counterbalance valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Abstract

The invention discloses a reservoir water level hydraulic control system, which comprises an oil supply device, a hydraulic actuator and a valve, wherein the oil supply device is used for supplying hydraulic oil to the reservoir water level hydraulic control system, the opening of the valve is adjustable, the valve is used for controlling the on-off and the flow of a water path, the hydraulic actuator is connected with the valve, and the hydraulic actuator is used for controlling the opening of the valve. The invention also discloses a using method of the reservoir water level hydraulic control system. The invention solves the problems of low stability, insufficient accuracy and poor deviation rectifying performance of the control of the reservoir water level in the prior art.

Description

Reservoir water level hydraulic control system and use method thereof
Technical Field
The invention relates to the technical field of hydraulic and hydroelectric engineering, in particular to a hydraulic reservoir level control system and a use method thereof.
Background
In water conservancy and hydropower engineering, water level control of a reservoir is an important technology, and is particularly obvious in pumped storage power station engineering.
The pumped storage power station is a hydropower station which pumps electric energy to an upper reservoir during a low ebb period of an electric load and discharges water to a lower reservoir to generate power during a peak period of the electric load, and is also called an energy storage type hydropower station. The device can convert the redundant electric energy when the load of the power grid is low into high-value electric energy when the load of the power grid is high, is also suitable for frequency modulation and phase modulation, stabilizes the cycle wave and the voltage of a power system, is suitable for emergency standby, and can improve the efficiency of a fire power station and a nuclear power station in the system.
The technical scheme of controlling water flow in a water channel is adopted to realize control of reservoir water level in the prior art, but the prior art has the problem that real-time and accurate monitoring and adjustment of water flow are difficult to realize, so that the defects of low control stability, insufficient accuracy and poor deviation correction performance of the reservoir water level are caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a hydraulic control system for reservoir water level and a use method thereof, which solve the problems of low control stability, insufficient accuracy and poor deviation correction performance of the reservoir water level in the prior art.
The technical scheme adopted by the invention for solving the problems is as follows:
the hydraulic reservoir level control system is characterized in that 2 or more oil supply branches are arranged between the oil supply device and the hydraulic actuator, each oil supply branch is provided with a flow control unit of a hydraulic oil path and a direction control unit of the hydraulic oil path, the direction control units are used for controlling the on-off or/and flowing direction of the hydraulic oil path, and each oil supply branch is at most communicated with one path at the same time.
In the technical scheme, the oil supply device supplies hydraulic oil for the reservoir water level hydraulic control system, the hydraulic actuator is connected with the valve and used for controlling the opening of the valve, so that the function of controlling the on-off and the flow of a water path in a water pipe by controlling the opening of the valve is realized, the flow control unit on each oil supply branch adjusts the flow of the hydraulic oil of the oil path, the movement speeds of the hydraulic actuator are different, the opening or closing speeds of the valve are different, the direction control unit on each oil supply branch is used for controlling the on-off or/and the flow direction of the hydraulic oil path, the opening and closing actions and the action speeds of the valve can be determined according to different states, the gradient of the opening and closing actions of the valve is formed, the stability of the control of the reservoir water level is ensured, the accuracy is high, and meanwhile, the correction can be timely according to real-time working conditions.
Preferably, k flow control units of the hydraulic oil paths and direction control units of the hydraulic oil paths are arranged on each oil supply branch, the direction control units are used for controlling the on/off or/and flow direction of the hydraulic oil paths, at most only one path of the k oil paths is connected at the same time, and k is greater than 2 and is an even number.
The k oil supply branches can more conveniently control the hydraulic actuator, each oil supply branch can control the flow of the hydraulic oil circuit and can control the on, off or/and flow direction of the hydraulic oil circuit, so that the movement speed and the timeliness of the hydraulic actuator become more controllable, more levels can be formed, the control on the opening degree of the valve is more facilitated, and the water level of the reservoir can be more efficiently and accurately controlled.
As a preferred technical scheme, 4 oil supply branches are arranged between the oil supply device and the hydraulic actuator, and are respectively:
the first oil supply branch comprises a first flow control valve for controlling the flow of hydraulic oil and a first on-off unit for controlling the on-off of a hydraulic oil path;
the second oil supply branch comprises a second flow control valve used for controlling the flow of the hydraulic oil and a second on-off unit used for controlling the on-off of the hydraulic oil path;
the third oil supply branch comprises a third flow control valve and a third on-off unit, wherein the third flow control valve is used for controlling the flow of the hydraulic oil, and the third on-off unit is used for controlling the on-off of a hydraulic oil path;
the fourth oil supply branch comprises a fourth flow control valve for controlling the flow of the hydraulic oil and a fourth breaking unit for controlling the on-off of the hydraulic oil path;
the first oil supply branch, the second oil supply branch, the third oil supply branch and the fourth oil supply branch are at most only communicated at the same moment.
The setting of 4 fuel feeding branch roads for break-make and the flow that sets up each fuel feeding branch road that can be very convenient, thereby can carry out more accurate control to hydraulic actuator's action, thereby can divide into 4 different modes with the aperture ground action of valve very conveniently: fast opening (fast opening for short), fast closing (fast closing for short), slow opening (slow opening for short) and slow closing (slow closing for short).
As a preferred technical solution, the first on-off unit and the second on-off unit are integrated together to form a directional control valve, and the third on-off unit and the fourth on-off unit are integrated together to form a reversing valve.
The two oil supply branches can be controlled by adopting one reversing valve, so that the two oil supply branches are convenient to purchase, and simultaneously, the two oil supply branches in the integrated unit generate an interlocking control relation, and the asynchronous and misoperation control of the two oil supply branches can be well prevented.
As a preferred technical solution, the hydraulic oil supply system further comprises a first pressure flow direction control unit arranged in a front end oil path shared by the first oil supply branch, the second oil supply branch, the third oil supply branch and the fourth oil supply branch, wherein the first pressure flow direction control unit is used for controlling the opening, closing, flow direction or/and pressure of the hydraulic oil path.
The first pressure flow direction control unit plays a front end control role in four oil supply branches. The total opening and closing of the four oil supply branches can be realized by controlling the opening and closing of the hydraulic oil branches, and if a one-way valve is added, the one-way flow of the hydraulic oil is controlled, so that the backflow of the hydraulic oil can be prevented; by controlling the pressure, the pressure can be prevented from being adjusted in real time due to over-pressure or insufficient pressure of an oil way; the maintenance of the oil line pressure may preferably be achieved using a back pressure valve. Of course, the actual selection of a valve or combination of valves is not limited to the several forms illustrated.
As a preferable technical solution, a fifth oil supply branch is further provided between the oil supply device and the hydraulic actuator, and a second pressure flow direction control unit for controlling the on/off and flow direction of the hydraulic oil path or/and the pressure is provided on the fifth oil supply branch.
The second pressure flow direction control unit can realize the opening and closing of the fifth oil supply branch by controlling the on and off of the hydraulic oil path, and if a one-way valve is added, the hydraulic oil is controlled to flow in a one-way manner, so that the backflow of the hydraulic oil can be prevented; by controlling the pressure, the pressure can be prevented from being adjusted in real time due to over-pressure or insufficient pressure of an oil way; the second pressure flow direction control unit is arranged, so that debugging and maintenance are facilitated, when debugging and maintenance are needed, the valve can be in a completely closed state, the first oil supply branch, the second oil supply branch, the third oil supply branch and the fourth oil supply branch are in a closed state, the second pressure flow direction control unit can be triggered to work as long as the valve does not reach or maintain the completely closed state, a back pressure valve can be preferably selected to keep the pressure of an oil way, and therefore misoperation of the system is prevented. Of course, the actual selection of a valve or combination of valves is not limited to the several forms illustrated.
As a preferred technical solution, the valve is a cone valve.
The conical valve has the characteristics of simple structure, light weight, good energy dissipation effect, flexible operation, convenient maintenance, reliable operation, small opening and closing force and the like. The conical valve is widely used in water conservancy, hydropower, reservoir and other projects.
The use method of the reservoir water level hydraulic control system comprises the following steps:
s1, setting a flow value of each oil supply branch;
s2, acquiring a real-time flow value of a hydraulic oil way passing through the hydraulic actuator 2;
s3, a target flow value of the hydraulic oil way;
and S4, adjusting the on or off of each oil supply branch according to the quantity relation of the flow values in the steps S1, S2 and S3.
The oil supply branch circuits are arranged, so that the on-off and the flow of each oil supply branch circuit can be conveniently set, the action of the hydraulic actuator 2 can be more accurately controlled, and the opening action of the valve 3 can be conveniently divided into different gradients.
The use method of the reservoir water level hydraulic control system comprises the following steps:
a. setting values of QL1, QL2, QL3 and QL4, wherein QL1, QL2, QL3 and QL4 are respectively flow values of oil supply branches where a first flow control valve, a second flow control valve, a third flow control valve and a fourth flow control valve are located, wherein QL1> QL3, and QL2> QL4;
b. acquiring a real-time flow value Q of a hydraulic oil way passing through a hydraulic actuator;
c. setting the value of Qc, regarding the first oil supply branch and the second oil supply branch as a first group of oil supply branches, regarding the third oil supply branch and the fourth oil supply branch as a second group of oil supply branches, and regarding Qc as a critical flow value when the first group of oil supply branches and the second group of oil supply branches are switched on, wherein Qc is less than Q;
d. setting Qn as a target flow value of a hydraulic oil way;
e. according to the quantity relation among Q, qc and Qn, the on or off of a first oil supply branch, a second oil supply branch, a third oil supply branch and a fourth oil supply branch is adjusted, and the specific adjusting method comprises the following steps:
if Qn is less than Q-Qc, firstly controlling the second on-off unit to be on, then driving the valve to be quickly opened by a certain opening degree by the hydraulic actuator, when Q is changed to Q-Qc, switching to control the fourth on-off unit to be on, driving the valve to be slowly opened by a certain opening degree by the hydraulic actuator, when Q is changed to Qn, controlling the fourth on-off unit to be off, stopping the hydraulic actuator, and keeping the valve at the current opening degree;
if Q-Qc is less than Qn and less than Q, the state of the fourth breaking unit is controlled to be on, the hydraulic actuator drives the valve to slowly open for a certain opening degree, when Q is changed to Qn, the state of the fourth breaking unit is controlled to be off, the hydraulic actuator stops acting, and the valve keeps the current opening degree;
if Q < Qn < Q + Qc, firstly controlling the state of the third breaking unit to be on, driving the valve to slowly close by a certain opening degree by the hydraulic actuator, and when Q is changed to Qn, controlling the state of the third breaking unit to be off, stopping the hydraulic actuator and keeping the valve at the current opening degree;
if Qn is greater than Q + Qc, the first on-off unit is controlled to be on, the hydraulic actuator drives the valve to close a certain opening rapidly, when Q changes to Q + Qc, the state is switched to control the third on-off unit to be on, the hydraulic actuator drives the valve to close a certain opening slowly, when Q changes to Qn, the third on-off unit is controlled to be off, the hydraulic actuator stops acting, and the valve keeps the current opening.
The setting of 4 fuel feeding branch roads for break-make and the flow that sets up each fuel feeding branch road that can be very convenient, thereby can carry out more accurate control to hydraulic actuator's action, thereby can divide into 4 different modes with the aperture ground action of valve very conveniently: fast opening (fast opening for short), fast closing (fast closing for short), slow opening (slow opening for short) and slow closing (slow closing for short).
As a preferred technical solution, a method for using a reservoir level hydraulic control system includes steps a, b, c, h, d, and i, where a, b, c, and d are the same as above, and steps h and i are as follows:
h. setting a flow regulation precision value Qs, wherein Qs is less than or equal to Qc;
i. according to the quantity relation among Q, qc, qn and Qs, the on or off of a first oil supply branch, a second oil supply branch, a third oil supply branch and a fourth oil supply branch is adjusted, and the specific adjusting method comprises the following steps:
if Qn is less than Q-Qc, the state of the second on-off unit is controlled to be on, when Q is changed to Q-Qc, the state of the fourth on-off unit is switched to be on, and when Q is changed to Qn, the state of the fourth on-off unit is controlled to be off;
if Q-Qc < Qn < Q-Qs, firstly controlling the state of the fourth breaking unit to be on, and when Q is changed to Qn, controlling the state of the fourth breaking unit to be off;
if Q-Qs < Qn < Q + Qs, controlling the states of the first on-off unit, the second on-off unit, the third on-off unit and the fourth on-off unit to be off;
if Q + Qs < Qn < Q + Qc, firstly controlling the state of the third on-off unit to be on, and when Q changes to Qn < Q, controlling the state of the third on-off unit to be off;
if Qn > Q + Qc, the state of the first on-off unit is controlled to be on, when Q is changed to Q + Qc, the state of the third on-off unit is controlled to be on, and when Q is changed to Qn, the state of the third on-off unit is controlled to be off.
And setting the flow regulation precision value Qs, so that the Qn entering the (Q-Qs, Q + Qs) interval is regarded as the Qn reaching the target flow.
This makes it possible to set the adjustment accuracy required by the actual operating conditions. Under the condition of higher adjustment precision, the setting of Qs is smaller, so that the precision can be effectively ensured; under the condition that the adjustment precision is not very high, the Qs can be properly set to be relatively large, so that the power consumption of the system is saved, the service life of system components can be prolonged, and waste caused by surplus functions is avoided. On the other hand, the setting of one interval as the target flow rate is more scientific compared with the setting of one specific value as the target flow rate, and errors and functional disorders which may occur under the condition that the specific value is used as the target flow rate can be effectively reduced.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention realizes the function of controlling the on-off and the flow of a water path in a water pipe by controlling the opening of the valve, the flow control unit adjusts the flow of hydraulic oil of the oil path, so that the movement speeds of the hydraulic actuators are different, the opening or closing speeds of the valve are different, the direction control unit is used for controlling the on-off and/or the flow direction of the hydraulic oil path, the opening and closing action and the action speed of the valve can be determined according to different states, the gradient of the opening and closing action of the valve is formed, the stability of the control of the water level of a reservoir is ensured, the accuracy is high, and meanwhile, the correction can be timely carried out according to real-time working conditions;
(2) The invention enables the movement speed and the timeliness of the hydraulic actuator to be more controllable, thereby being more beneficial to controlling the opening of the valve and more efficiently and accurately controlling the water level of the reservoir;
(3) The invention can conveniently divide the opening action of the valve into 4 different modes: the hydraulic actuator can be controlled more accurately by fast opening, fast closing, slow opening and slow closing;
(4) The invention enables the two oil supply branches in the integrated unit to generate an interlocking control relation, and can well prevent the asynchronous control and the false operation of the control of the two oil supply branches;
(5) The invention can prevent the backflow of hydraulic oil and can also avoid the over-pressure or insufficient pressure of an oil way to adjust the pressure in real time.
(6) The conical valve adopted by the invention has the characteristics of simple structure, light weight, good energy dissipation effect, flexible operation, convenient maintenance, reliable operation, small opening and closing force and the like;
(7) The setting of the flow regulation precision value in the invention can be carried out according to the regulation precision required by the actual working condition, thus being beneficial to more effectively ensuring the precision; the service life of system components can be prolonged, waste caused by surplus functions is avoided, the method is more scientific, and errors and functional disorders which may occur can be effectively reduced.
Drawings
FIG. 1 is a schematic structural diagram of a reservoir water level hydraulic control system according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a diagram showing the operation relationship between the related units and the valves according to the present invention.
Reference numbers and corresponding part names in the drawings: 1. the hydraulic control system comprises an oil supply device, 2, a hydraulic actuator, 3, a valve, 5, a first pressure flow direction control unit, 6, a second pressure flow direction control unit, 11, a first flow control valve, 12, a first on-off unit, 21, a second flow control valve, 22, a second on-off unit, 31, a third flow control valve, 32, a third on-off unit, 41, a fourth flow control valve, 42 and a fourth on-off unit.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Example 1
As shown in fig. 1 to 3, a reservoir water level hydraulic control system includes an oil supply device 1, a hydraulic actuator 2, and a valve 3, where the oil supply device 1 is configured to supply hydraulic oil to the reservoir water level hydraulic control system, an opening of the valve 3 is adjustable, the valve 3 is configured to control on/off and flow of a water path, the hydraulic actuator 2 is connected to the valve 3, and the hydraulic actuator 2 is configured to control an opening of the valve 3, and is characterized in that 2 or more oil supply branches are provided between the oil supply device 1 and the hydraulic actuator 2, each oil supply branch is provided with a flow control unit of a hydraulic oil path and a direction control unit of the hydraulic oil path, and the direction control unit is configured to control on/off, or/and a flow direction of the hydraulic oil path, and each oil supply branch is at most connected with only one path at the same time.
When the hydraulic actuator 2 is used for controlling the opening of the valve 3, so that the on-off and flow rate of a water path in the water pipe 4 are controlled by controlling the opening of the valve 3, the flow control unit on each oil supply branch adjusts the flow rate of the hydraulic oil in the oil path, so that the movement speeds of the hydraulic actuator 2 are different, the opening or closing speeds of the valve are different, the direction control unit on each oil supply branch is used for controlling the on-off or/and flow direction of the hydraulic oil path, the opening or closing action and the action speed of the valve 3 can be determined according to different states, the gradient of the opening or closing action of the valve 3 is formed, the stability of the control of the water level of the reservoir is guaranteed, the accuracy is high, and meanwhile, the correction can be timely carried out according to real-time working conditions. In this embodiment, the hydraulic actuator 2 may preferably be a linear hydraulic cylinder, and more preferably a single-rod double-acting hydraulic cylinder, which is convenient for operation and wide in popularization.
It is worth to say that the hydraulic system is adopted in the invention because the hydraulic actuator has larger force and better effect. However, as a technical teaching, pneumatic systems, electric drive systems may also be used to implement the present invention.
Preferably, k oil supply devices are arranged between the oil supply device 1 and the hydraulic actuator 2, each oil supply branch is provided with a flow control unit of a hydraulic oil path and a direction control unit of the hydraulic oil path, the direction control unit is used for controlling the on/off or/and flow direction of the hydraulic oil path, at most only one path of the k oil supply devices is connected at the same time, and k is more than 2 and is an even number.
The k oil supply branches can more conveniently control the hydraulic actuator, each oil supply branch can control the flow of the hydraulic oil circuit and can control the on, off or/and flow direction of the hydraulic oil circuit, so that the movement speed and the timeliness of the hydraulic actuator become more controllable, the gradient of the opening and closing actions of the valves 3 of more levels can be formed, the control of the opening degree of the valves is more facilitated, and the water level of the reservoir can be more efficiently and accurately controlled.
As a preferred technical solution, 4 oil supply branches are provided between the oil supply device 1 and the hydraulic actuator 2, and respectively:
the hydraulic oil supply system comprises a first oil supply branch, a second oil supply branch and a control unit, wherein the first oil supply branch comprises a first flow control valve 11 for controlling the flow of hydraulic oil and a first on-off unit 12 for controlling the on-off of a hydraulic oil path;
a second oil supply branch including a second flow control valve 21 for controlling the flow of the hydraulic oil, and a second on/off unit 22 for controlling the on/off of the hydraulic oil path;
the third oil supply branch comprises a third flow control valve 31 for controlling the flow of the hydraulic oil and a third on-off unit 32 for controlling the on-off of the hydraulic oil path;
a fourth oil supply branch, which includes a fourth flow control valve 41 for controlling the flow of the hydraulic oil and a fourth breaking unit 42 for controlling the on/off of the hydraulic oil path;
the first oil supply branch, the second oil supply branch, the third oil supply branch and the fourth oil supply branch are at most only communicated at the same time.
The setting of 4 fuel feeding branch roads for break-make and the flow that sets up each fuel feeding branch road that can be very convenient, thereby can carry out more accurate control to hydraulic actuator 2's action, thereby can divide into 4 different modes with the aperture ground action of valve 3 very conveniently: fast opening (fast opening for short), fast closing (fast closing for short), slow opening (slow opening for short) and slow closing (slow closing for short).
The convenience of the control is shown by way of example in a setting mode of 4 states, and the use method of the reservoir level hydraulic control system comprises the following steps:
a. setting values of QL1, QL2, QL3 and QL4, wherein QL1, QL2, QL3 and QL4 are respectively flow values of oil supply branches where the first flow control valve 11, the second flow control valve 21, the third flow control valve 31 and the fourth flow control valve 41 are located, wherein QL1> QL3, and QL2> QL4;
b. acquiring a real-time flow value Q of a hydraulic oil circuit passing through the hydraulic actuator 2;
c. setting the value of Qc, regarding the first oil supply branch and the second oil supply branch as a first group of oil supply branches, regarding the third oil supply branch and the fourth oil supply branch as a second group of oil supply branches, and regarding Qc as a critical flow value when the first group of oil supply branches and the second group of oil supply branches are switched on, wherein Qc is less than Q;
d. setting Qn as a target flow value of a hydraulic oil way;
e. according to the quantity relation among Q, qc and Qn, the on or off of a first oil supply branch, a second oil supply branch, a third oil supply branch and a fourth oil supply branch is adjusted, and the specific adjusting method comprises the following steps:
if Qn is less than Q-Qc, firstly controlling the second on-off unit 22 to be in an on state, then the hydraulic actuator 2 drives the valve 3 to be quickly opened by a certain opening degree, when Q is changed to Q-Qc, switching to control the fourth on-off unit 42 to be in an on state, the hydraulic actuator 2 drives the valve 3 to be slowly opened by a certain opening degree, when Q is changed to Qn, the fourth on-off unit 42 is controlled to be in an off state, the hydraulic actuator 2 stops acting, and the valve 3 keeps the current opening degree;
if Q-Qc < Qn < Q, the fourth breaking unit 42 is firstly controlled to be on, the hydraulic actuator 2 drives the valve 3 to slowly open for a certain opening, when Q is changed to Qn, the fourth breaking unit 42 is controlled to be off, the hydraulic actuator 2 stops acting, and the valve 3 keeps the current opening;
if Q < Qn < Q + Qc, firstly controlling the third on-off unit 32 to be on, driving the valve 3 to slowly close by a certain opening degree by the hydraulic actuator 2, and when Q is changed to Qn, controlling the third on-off unit 32 to be off, stopping the hydraulic actuator 2, and keeping the valve 3 at the current opening degree;
if Qn is greater than Q + Qc, the first on-off unit 12 is firstly controlled to be on, the hydraulic actuator 2 drives the valve 3 to be quickly closed by a certain opening degree, when Q is changed to Q + Qc, the state is switched to be on by controlling the third on-off unit 32, the hydraulic actuator 2 drives the valve 3 to be slowly closed by a certain opening degree, when Q is changed to Qn, the state of the third on-off unit 32 is controlled to be off, the hydraulic actuator 2 stops acting, and the valve 3 keeps the current opening degree.
It should be noted that the order of steps a, b, c, d is adjustable, and that there are many logical combinations of the order.
The above four oil supply branches may be combined with a throttle valve, a check valve, etc., and the specific structure thereof is not limited to the specific structure described in the specification and the drawings.
It should be noted that the oil supply device of the present invention is not limited to the structure shown in the specification and the drawings, and may include a filtering system, a pressurizing system, an oil treatment system, etc., and a user may set the oil supply device according to actual working conditions.
It should be noted that the numerical values of the critical points in the numerical value intervals, specifically which interval belongs to, may be set according to the use habit and the actual working condition of the user, and do not affect the use and technical effects of the present invention.
It should be noted that the real-time flow value Q may be obtained by measurement or calculation, the calculation may be manual, or may be automatically calculated by using an electrical device such as a PLC, a computer, or the like, and the calculation may be performed according to the upstream water level (upstream pressure before the valve 3) and the opening degree of the valve 3 by using the following formula:
the calculation is automatically carried out according to the upstream water level (upstream pressure before the valve) and the valve opening, and the calculation formula is as follows:
Q＝K*H 1/2
in the formula: q-real time flow value, in m 3 S, a one-digit decimal number can be taken;
h-upstream pressure, in m, can take a decimal place;
k-coefficient of calculation, dimensionless constant, calculated from the following formula:
K＝10.096*X 6 -37.662*X 5 +56.285*X 4 -42.759*X 3 +7.449*X 2 +16.141*X-0.535
in the formula, X is the opening of the valve, and the value range is 0-100%.
The significance of the Qc parameter is the critical flow rate of the valve 3 when running fast and slow, such as setting the flow rate to be 12m 3 S, field flow rate variation of 2m 3 S when the valve is made of, for example, 5m 3 The/s is gradually and rapidly increased to 10m 3 When the time is s, the speed is changed to slow speed to 12m 3 S, and so on for the rest.
Correspondingly, an opening degree speed change value of the valve 3 can be set, and the parameter of the opening degree speed change value means an opening degree range in which the opening degree of the valve 3 is changed from fast to slow in operation, and the smaller the value is, the smaller the opening degree of the slow running is. The opening degree of the valve 3 can be represented by 0 to 100.0%. If the target opening degree of the valve 3 is set to 40%, the opening degree speed change value is set to 5, for example, the valve 3 starts to act from 60%, when the valve is operated to the opening degree of (40 + 5)%, the valve 3 is slowly operated until the valve is stopped at less than or equal to 40%, and the rest is the same.
As a preferred technical solution, the first on-off unit 12 and the second on-off unit 22 are integrated into a single directional control valve, and the third on-off unit 32 and the fourth on-off unit 42 are integrated into a single directional control valve.
The two oil supply branches can be controlled by adopting one reversing valve, so that the two oil supply branches are convenient to purchase, and simultaneously, the two oil supply branches in the integrated unit generate an interlocking control relation, and the asynchronous and misoperation of the control of the two oil supply branches can be well prevented. Preferably, the first on-off unit 12, the second on-off unit 22, the third on-off unit 32, and the fourth on-off unit 42 are electromagnetic directional valves, and more preferably three-position four-way or three-position five-way electromagnetic directional valves. The electromagnetic reversing valve is convenient for electrified automatic control, can be matched with different circuits to realize expected control, and can effectively ensure the control precision and flexibility, and the three-position four-way or three-position five-way electromagnetic reversing valve is an electromagnetic reversing valve which is widely used, has mature technology and can better ensure the stability of a system.
Example 2
As shown in fig. 1 to fig. 3, as a further optimization of embodiment 1, this embodiment includes all the technical features of embodiment 1, and in addition, this embodiment further includes the following technical features:
as a preferable technical solution, the hydraulic control system further includes a first pressure flow direction control unit 5 disposed in a front end oil path shared by the first oil supply branch, the second oil supply branch, the third oil supply branch and the fourth oil supply branch, where the first pressure flow direction control unit 5 is configured to control the on/off, flow direction or/and pressure of the hydraulic oil path.
The first pressure flow direction control unit 5 performs a front end control function on the four oil supply branches. The total opening and closing of the four oil supply branches can be realized by controlling the opening and closing of the hydraulic oil branches, and if a one-way valve is added, the one-way flow of the hydraulic oil is controlled, so that the backflow of the hydraulic oil can be prevented; by controlling the pressure, the pressure can be prevented from being adjusted in real time due to over-pressure or insufficient pressure of an oil way; the maintenance of the oil line pressure may preferably be achieved using a back pressure valve. Of course, the actual selection of a valve or combination of valves is not limited to the several forms illustrated.
As a preferable technical solution, a fifth oil supply branch is further provided between the oil supply device 1 and the hydraulic actuator 2, and a second pressure flow direction control unit 6 for controlling the on/off and flow direction of the hydraulic oil path or/and the pressure is provided on the fifth oil supply branch.
The second pressure flow direction control unit 6 can realize the opening and closing of the fifth oil supply branch by controlling the on and off of the hydraulic oil path, and if a one-way valve is added, the hydraulic oil is controlled to flow in a one-way manner, so that the backflow of the hydraulic oil can be prevented; by controlling the pressure, the pressure can be prevented from being adjusted in real time due to over-pressure or under-pressure of an oil way; the second pressure flows to the setting of the control unit 6, the debugging and maintenance of being convenient for, when needing the debugging and maintenance, can make valve 3 be in the state of closing completely, and first oil feed branch, second oil feed branch, third oil feed branch, fourth oil feed branch are in the closed condition, as long as valve 3 does not reach or maintain the complete closed condition, can touch the work of second pressure flow to the control unit 6, can prefer the backpressure valve, realize the maintenance of oil circuit pressure to prevent the malfunction of system. Of course, the actual selection of a valve or combination of valves is not limited to the several forms illustrated.
Regarding the actions of 4 oil supply branches and 2 pressure flow direction control units, refer to fig. 3, wherein + represents that the electromagnetic head is powered on, and blank represents that the electromagnetic head is powered off. In addition, when the valve is in the 100% open state, the second pressure flow direction control unit is de-energized.
As a preferred solution, the valve 3 is a cone valve.
The conical valve has the characteristics of simple structure, light weight, good energy dissipation effect, flexible operation, convenient maintenance, reliable operation, small opening and closing force and the like. The conical valve is widely used in water conservancy, hydropower, reservoir and other projects.
Valves with slide valve, ball valve and other structures can also be selected.
The hydraulic actuator 2 can preferably be a rod-type double-acting hydraulic cylinder, and can also preferably be realized by adopting 2 identical rod-type double-acting hydraulic cylinders, and the 2 hydraulic cylinders are arranged at the force application points which are symmetrical about the central line of the cone valve, so that the opening degree of the cone valve can be adjusted more stably, the effect of more accurate and stable control of the water flow in the cone valve can be achieved, and the reliability of the system is improved.
Example 3
As shown in fig. 1 to 3, the present embodiment provides a method for using the above-mentioned reservoir level hydraulic control system, including the following steps:
s1, setting a flow value of each oil supply branch;
s2, acquiring a real-time flow value of a hydraulic oil way passing through the hydraulic actuator 2;
s3, a target flow value of the hydraulic oil way;
and S4, adjusting the on or off of each oil supply branch according to the quantity relation of the flow values in the steps S1, S2 and S3.
The oil supply branch circuits are arranged, so that the on-off and the flow of each oil supply branch circuit can be conveniently set, the action of the hydraulic actuator 2 can be more accurately controlled, and the opening action of the valve 3 can be conveniently divided into different gradients.
It should be noted that the sequence of steps S1, S2, S3 is adjustable, and there may be various combinations of the sequence.
The embodiment also provides a use method of the above reservoir water level hydraulic control system, which includes the following steps:
a. setting values of QL1, QL2, QL3 and QL4, wherein QL1, QL2, QL3 and QL4 are respectively flow values of oil supply branches where the first flow control valve 11, the second flow control valve 21, the third flow control valve 31 and the fourth flow control valve 41 are located, wherein QL1> QL3, and QL2> QL4;
b. acquiring a real-time flow value Q of a hydraulic oil way passing through the hydraulic actuator 2;
c. setting the value of Qc, regarding the first oil supply branch and the second oil supply branch as a first group of oil supply branches, regarding the third oil supply branch and the fourth oil supply branch as a second group of oil supply branches, and regarding Qc as a critical flow value when the first group of oil supply branches and the second group of oil supply branches are switched on, wherein Qc is less than Q;
d. setting Qn as a target flow value of a hydraulic oil way;
e. according to the quantity relation among Q, qc and Qn, the on or off of a first oil supply branch, a second oil supply branch, a third oil supply branch and a fourth oil supply branch is adjusted, and the specific adjusting method comprises the following steps:
if Qn is less than Q-Qc, firstly controlling the second on-off unit 22 to be in an on state, then the hydraulic actuator 2 drives the valve 3 to be quickly opened by a certain opening degree, when Q is changed to Q-Qc, switching to control the fourth on-off unit 42 to be in an on state, the hydraulic actuator 2 drives the valve 3 to be slowly opened by a certain opening degree, when Q is changed to Qn, the fourth on-off unit 42 is controlled to be in an off state, the hydraulic actuator 2 stops acting, and the valve 3 keeps the current opening degree;
if Q-Qc < Qn < Q, the fourth breaking unit 42 is firstly controlled to be on, the hydraulic actuator 2 drives the valve 3 to slowly open for a certain opening, when Q is changed to Qn, the fourth breaking unit 42 is controlled to be off, the hydraulic actuator 2 stops acting, and the valve 3 keeps the current opening;
if Q < Qn < Q + Qc, firstly controlling the third on-off unit 32 to be on, driving the valve 3 to be closed by a certain opening at a slow speed by the hydraulic actuator 2, and when Q is changed to Qn, controlling the third on-off unit 32 to be off, stopping the hydraulic actuator 2, and keeping the valve 3 at the current opening;
if Qn is greater than Q + Qc, the first on-off unit 12 is firstly controlled to be on, the hydraulic actuator 2 drives the valve 3 to be quickly closed by a certain opening degree, when Q is changed to Q + Qc, the state is switched to be on by controlling the third on-off unit 32, the hydraulic actuator 2 drives the valve 3 to be slowly closed by a certain opening degree, when Q is changed to Qn, the state of the third on-off unit 32 is controlled to be off, the hydraulic actuator 2 stops acting, and the valve 3 keeps the current opening degree.
The setting of 4 fuel feeding branch roads for break-make and the flow that sets up each fuel feeding branch road that can be very convenient, thereby can carry out more accurate control to hydraulic actuator 2's action, thereby can divide into 4 different modes with the aperture ground action of valve 3 very conveniently: fast opening (fast opening for short), fast closing (fast closing for short), slow opening (slow opening for short) and slow closing (slow closing for short).
It should be noted that the order of steps a, b, c, d is adjustable, and that there are many logical combinations of the order.
It should be noted that the numerical values of the critical points in the numerical value intervals, specifically which interval belongs to, may be set according to the use habit and the actual working condition of the user, and do not affect the use and technical effects of the present invention.
As a preferred technical solution, a method for using a reservoir level hydraulic control system includes steps a, b, c, h, d, and i, where a, b, c, and d are the same as above, and steps h and i are as follows:
h. setting a flow regulation precision value Qs, wherein Qs is less than or equal to Qc;
i. according to the quantity relation among Q, qc, qn and Qs, the on or off of a first oil supply branch, a second oil supply branch, a third oil supply branch and a fourth oil supply branch is adjusted, and the specific adjusting method comprises the following steps:
if Qn < Q-Qc, the second switching unit 22 is firstly controlled to be on, when Q is changed to Q-Qc, the fourth switching unit 42 is switched to be on, and when Q is changed to Qn, the fourth switching unit 42 is controlled to be off;
if Q-Qc < Qn < Q-Qs, the fourth breaking unit 42 is firstly controlled to be on, and when Q is changed to Qn, the fourth breaking unit 42 is controlled to be off;
if Q-Qs < Qn < Q + Qs, the states of the first on-off unit 12, the second on-off unit 22, the third on-off unit 32 and the fourth on-off unit 42 are all controlled to be off;
if Q + Qs < Qn < Q + Qc, the third on-off unit 32 is controlled to be on, and when Q changes to Qn < Q, the third on-off unit 32 is controlled to be off;
if Qn > Q + Qc, the first on-off unit 12 is first controlled to be on, when Q changes to Q + Qc, the third on-off unit 32 is switched to be on, and when Q changes to Qn, the third on-off unit 32 is controlled to be off.
And setting the flow regulation precision value Qs, so that the Qn entering the (Q-Qs, Q + Qs) interval is regarded as the Qn reaching the target flow.
This makes it possible to set the adjustment accuracy required by the actual operating conditions. Under the condition of higher adjustment precision, the setting of Qs is smaller, so that the precision can be effectively ensured; under the condition that the adjustment precision is not very high, the Qs can be properly set to be relatively large, so that the power consumption of the system is saved, the service life of system components can be prolonged, and waste caused by surplus functions is avoided. On the other hand, the setting of one interval as the target flow rate is more scientific than the setting of one specific value as the target flow rate, and errors and functional disorder which may occur under the condition that the specific value is used as the target flow rate can be effectively reduced.
Correspondingly, a valve opening degree adjusting precision value can be set, the parameter meaning is that when the difference value of the valve opening degree adjusting precision value and the target opening degree of the valve 3 is in the range during operation, the actual opening degree of the valve 3 is the target opening degree, and if the target opening degree is set to be 30%, the adjusting precision is set to be 1, the valve is not adjusted within the range of 29-31.
It should be noted that the valve opening can be read from the valve itself, or by measurement, the valve opening is obtained according to the existing mature technology, which is easy to implement, and is not the innovation point of the present invention, so the obtaining process is not described in detail.
It should be noted that the order of steps a, b, c, h, d is adjustable, and the order may have various logical combinations.
It should be noted that the numerical value of the critical point in the numerical value interval, specifically which interval belongs to, may be set according to the use habit and the actual working condition of the user, and does not affect the use and technical effect of the present invention.
Example 4
As shown in fig. 1 to 3, the present embodiment provides an example of using the PLC electric control using the technical solution of the present invention.
The system is electrically controlled by adopting a PLC, a control system comprises an oil pump motor set, an oil tank, an energy accumulator, a pressure gauge, an automatic element, a hydraulic valve, an oil filter, an integrated valve block, an access door, a hydraulic pipeline and accessories, an electrical control box and accessories, a PLC system and the like, wherein the PLC control system comprises a CPU module, an analog input module, a DP communication module, a touch screen and the like;
the PLC system consists of hardware and software (control program), wherein the hardware part comprises a PLC, a color touch screen, a circuit breaker, an intermediate relay, an indicator light, a button, a wiring terminal, a cable and the like; the software portion includes a PLC program and the like.
The PLC communication interface is communicated with an upper computer by adopting a Profibus-DP communication protocol and has a DC 4-20 mA analog quantity input and output function;
the CPU module is responsible for calculating and storing data, inputting switching value signals and outputting the switching value signals; the analog quantity input module acquires oil level, oil supply pressure, valve real-time position and upstream water level pressure signals of an oil tank; the DP communication module processes various data signals exchanged with the upper computer, including sending and receiving signals; the touch screen is used as a man-machine interface device, and is used for inputting operator instructions and data settings to the PLC and simultaneously displaying meter reading, alarm information, state signals and the like;
the PLC control system software (control program) reads and processes switching value and analog quantity signals input by a hydraulic station instrument, buttons of an operation panel of an electric control cabinet, switching signals, touch screen input instructions and parameter setting signals, and outputs switching signals for controlling an oil pump and an electromagnetic valve according to program logic operation.
The system meets the requirements of signals of the oil level, the pressure, the real-time valve position of the valve and the pressure of the upstream water level, and the control system is realized by adopting PLC + touch screen + upper computer DP remote communication control.
The PLC includes: the device comprises a digital quantity input/output module, an analog quantity input module, a communication module and a touch screen.
The PLC input signal can be set as follows: the system comprises a passive switching value signal (electric cabinet external signal) of a valve full-closed position and a full-open position, a valve real-time valve position analog quantity signal (DC 4-20 mA) (electric cabinet external signal), a valve upstream side water pressure analog quantity signal (DC 4-20 mA) (electric cabinet external signal), a system oil pressure analog quantity signal (DC 4-20 mA) (hydraulic station internal signal), a system oil pressure start-stop oil pump switching value signal (hydraulic station internal signal), a system oil tank oil level analog quantity signal (DC 4-20 mA) (hydraulic station internal signal), a system oil tank oil temperature overhigh alarm switching value signal (hydraulic station internal signal), a local manual control time switching, a switching and stopping instruction, a local automatic control time flow setting and flow precision instruction, a remote automatic control time opening setting and switching, switching and stopping instruction, a control mode switching instruction and a system oil pressure accident low oil pressure alarm signal.
The output signal can set: the system comprises passive switching value signals of fully closed and fully opened positions of a valve, a real-time valve position analog quantity signal of the valve, a system oil pressure analog quantity signal (DC 4-20 mA), a system oil tank oil level analog quantity signal (DC 4-20 mA), an oil tank oil temperature overhigh switching value signal, a control mode signal, a filter element blockage signal, an oil pump operation signal, a system comprehensive fault signal, a flow analog quantity signal (DC 4-20 mA) (output according to a calculated value) and a system oil pressure accident low oil pressure alarm signal.
The method adopts a combined control mode of a touch screen and a PLC (programmable logic controller): the touch screen has the main functions of performing interactive input/output operation and information display; the main function of the PLC is calculation and control.
The bladder type energy accumulator is used as a valve opening and Guan Fadong force source, and the total capacity of the energy accumulator tank is as follows: when the cone valve power connector acts in the whole process of normal lower limit working oil pressure (one servomotor full stroke is defined as the stroke of a servomotor piston from 0 to 100 percent) under the condition that the oil supply pump is not started, the oil pressure is still higher than the allowable minimum operating oil pressure (namely accident oil pressure). When the oil pressure is reduced to the accident oil pressure under all the operating working conditions, the cone valve can be ensured to complete one-time reliable closing operation. When the system has trace leakage, the leather bag type energy accumulator supplies a small amount of supplementary pressure oil for the system.
A double-oil pump motor set is adopted, one is used and the other is standby. The two oil pumps can be operated independently or in combination. In the combined operation mode, each oil pump can be used as a working pump automatically and alternately, and the working pump can be selected manually. When the working pressure of the oil pressure low-pressure working pump is high, the standby pump is automatically started. Any oil pump should be isolated from the oil system for servicing without affecting the normal operation of the rest of the system.
The oil tank is provided with an oil level display and oil level signal output device, and the oil level signal output device adopts an oil level transmitter and sends a DC 4-20 mA analog quantity signal to the control cabinet.
After being pressurized and filtered by the oil pump, the oil enters the directional electromagnetic valve and the energy accumulator to simultaneously carry out signal detection. The opening, closing and stopping of the valve 3 is controlled according to the position signal of the valve 3 and the input control signal.
Three control modes of local manual control, local automatic control and remote automatic control can be adopted, and each mode is interlocked. The on-site manual control is manually operated through a touch screen and is used for debugging and overhauling; the in-situ automatic control is carried out through a program in a touch screen; the remote automatic control is realized by arranging a remote controller at a remote end and performing remote operation control.
As described above, the present invention can be preferably realized.
The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.

Claims (8)

1. A reservoir water level hydraulic control system comprises an oil supply device (1), a hydraulic actuator (2) and a valve (3), wherein the oil supply device (1) is used for supplying hydraulic oil for the reservoir water level hydraulic control system, the opening degree of the valve (3) is adjustable, the valve (3) is used for controlling the on-off and flow of a water path, the hydraulic actuator (2) is connected with the valve (3), and the hydraulic actuator (2) is used for controlling the opening degree of the valve (3), the reservoir water level hydraulic control system is characterized in that 2 or more oil supply branches are arranged between the oil supply device (1) and the hydraulic actuator (2), each oil supply branch is provided with a flow control unit of a hydraulic oil path and a direction control unit of the hydraulic oil path, the direction control units are used for controlling the on-off or/and the flow direction of the hydraulic oil path, and at most one oil supply branch is connected at the same time;
k or more oil supply branches are arranged between the oil supply device (1) and the hydraulic actuator (2), each oil supply branch is provided with a flow control unit of a hydraulic oil way and a direction control unit of the hydraulic oil way, the direction control units are used for controlling the on-off or/and flow direction of the hydraulic oil way, at most one oil supply branch of the k or more oil supply branches is connected at the same time, wherein k is more than 2 and k is an even number;
be equipped with 4 fuel feeding branch roads between oil supply unit (1) and hydraulic actuator (2), be respectively:
the hydraulic oil supply system comprises a first oil supply branch, a second oil supply branch and a control unit, wherein the first oil supply branch comprises a first flow control valve (11) used for controlling the flow of hydraulic oil and a first on-off unit (12) used for controlling the on-off of a hydraulic oil circuit;
the second oil supply branch comprises a second flow control valve (21) used for controlling the flow of the hydraulic oil and a second on-off unit (22) used for controlling the on-off of the hydraulic oil circuit;
the third oil supply branch comprises a third flow control valve (31) for controlling the flow of the hydraulic oil and a third on-off unit (32) for controlling the on-off of the hydraulic oil path;
the fourth oil supply branch comprises a fourth flow control valve (41) for controlling the flow of the hydraulic oil and a fourth on-off unit (42) for controlling the on-off of the hydraulic oil path;
the first oil supply branch, the second oil supply branch, the third oil supply branch and the fourth oil supply branch are at most only communicated at the same time.
2. The reservoir level hydraulic control system according to claim 1, wherein the first on-off unit (12) and the second on-off unit (22) are integrated together as a directional control valve, and the third on-off unit (32) and the fourth on-off unit (42) are integrated together as a directional control valve.
3. The reservoir water level hydraulic control system according to claim 2, further comprising a first pressure flow direction control unit (5) arranged in a front end oil path common to the first oil supply branch, the second oil supply branch, the third oil supply branch and the fourth oil supply branch, wherein the first pressure flow direction control unit (5) is used for controlling opening, closing, flow direction or/and pressure of the hydraulic oil path.
4. The reservoir water level hydraulic control system according to claim 3, wherein a fifth oil supply branch is further arranged between the oil supply device (1) and the hydraulic actuator (2), and a second pressure flow direction control unit (6) for controlling the on/off and flow direction or/and pressure of the hydraulic oil path is arranged on the fifth oil supply branch.
5. A reservoir level hydraulic control system according to any of claims 1 to 4, characterised in that the valve (3) is a cone valve.
6. Use of the reservoir level hydraulic control system according to any one of claims 1 to 5, characterized by comprising the following steps:
s1, setting a flow value of each oil supply branch;
s2, acquiring a real-time flow value of a hydraulic oil way passing through the hydraulic actuator (2);
s3, a target flow value of the hydraulic oil way;
and S4, adjusting the on or off of each oil supply branch according to the quantity relation of the flow values in the steps S1, S2 and S3.
7. Use of the reservoir level hydraulic control system according to any one of claims 1 to 5, characterized by comprising the steps of:
a. setting Q L1 、Q L2 、Q L3 、Q L4 Value of (A), Q L1 、Q L2 、Q L3 、Q L4 Respectively are the flow values of the oil supply branches where the first flow control valve (11), the second flow control valve (21), the third flow control valve (31) and the fourth flow control valve (41) are positioned, wherein QL1>QL3,Q L2 >QL4；
b. Acquiring a real-time flow value Q of a hydraulic oil circuit passing through the hydraulic actuator (2);
c. setting the value of Qc, regarding the first oil supply branch and the second oil supply branch as a first group of oil supply branches, regarding the third oil supply branch and the fourth oil supply branch as a second group of oil supply branches, and regarding Qc as a critical flow value when the first group of oil supply branches and the second group of oil supply branches are switched on, wherein Qc is less than Q;
d. setting Qn as a target flow value of a hydraulic oil way;
e. according to the quantity relation among Q, qc and Qn, the on or off of a first oil supply branch, a second oil supply branch, a third oil supply branch and a fourth oil supply branch is adjusted, and the specific adjusting method comprises the following steps:
if Qn is less than Q-Qc, the second on-off unit (22) is controlled to be on, when Q is changed to Q-Qc, the state is switched to the fourth on-off unit (42), and when Q is changed to Qn, the state of the fourth on-off unit (42) is controlled to be off;
if Q-Qc < Qn < Q, the fourth breaking unit (42) is controlled to be on, and when Q is changed to Qn, the fourth breaking unit (42) is controlled to be off;
if Q < Qn < Q + Qc, the third on-off unit (32) is controlled to be on, and when Q is changed to Qn, the third on-off unit (32) is controlled to be off;
if Qn is greater than Q + Qc, the first on-off unit (12) is firstly controlled to be on, when Q is changed to Q + Qc, the state is switched to be on to control the third on-off unit (32), and when Q is changed to Qn, the state of the third on-off unit (32) is controlled to be off.
8. The use method of the reservoir level hydraulic control system according to any one of claims 1 to 5, characterized by comprising the steps of a, b, c, h, d and i, and specifically comprising the following steps:
a. set Q L1 、Q L2 、Q L3 、Q L4 Value of (A), Q L1 、Q L2 、Q L3 、Q L4 Respectively are the flow values of the oil supply branch where the first flow control valve (11), the second flow control valve (21), the third flow control valve (31) and the fourth flow control valve (41) are positioned, wherein, QL1>QL3,Q L2 >QL4；
b. Acquiring a real-time flow value Q of a hydraulic oil circuit passing through the hydraulic actuator (2);
c. setting the value of Qc, regarding the first oil supply branch and the second oil supply branch as a first group of oil supply branches, regarding the third oil supply branch and the fourth oil supply branch as a second group of oil supply branches, and regarding Qc as a critical flow value when the first group of oil supply branches and the second group of oil supply branches are switched on, wherein Qc is less than Q;
h. setting a flow regulation precision value Qs, wherein Qs is less than or equal to Qc;
d. setting Qn as a target flow value of a hydraulic oil way;
i. according to the quantity relation among Q, qc, qn and Qs, the on or off of a first oil supply branch, a second oil supply branch, a third oil supply branch and a fourth oil supply branch is adjusted, and the specific adjusting method comprises the following steps:
if Qn is less than Q-Qc, the second on-off unit (22) is controlled to be on, when Q is changed to Q-Qc, the fourth on-off unit (42) is controlled to be on, and when Q is changed to Qn, the fourth on-off unit (42) is controlled to be off;
if Q-Qc < Qn < Q-Qs, the fourth breaking unit (42) is controlled to be on, and when Q is changed to Qn, the fourth breaking unit (42) is controlled to be off;
if Q-Qs < Qn < Q + Qs, the states of the first on-off unit (12), the second on-off unit (22), the third on-off unit (32) and the fourth on-off unit (42) are all controlled to be off;
if Q + Qs < Qn < Q + Qc, the third on-off unit (32) is controlled to be on, and when Q changes to Qn < Q, the third on-off unit (32) is controlled to be off;
if Qn is greater than Q + Qc, the first on-off unit (12) is firstly controlled to be on, when Q is changed to Q + Qc, the state is switched to be on to control the third on-off unit (32), and when Q is changed to Qn, the state of the third on-off unit (32) is controlled to be off.
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