CN106194680B - The axial plunger pump installation and control method of a kind of high-precision electric proportional control - Google Patents
The axial plunger pump installation and control method of a kind of high-precision electric proportional control Download PDFInfo
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- CN106194680B CN106194680B CN201610736360.7A CN201610736360A CN106194680B CN 106194680 B CN106194680 B CN 106194680B CN 201610736360 A CN201610736360 A CN 201610736360A CN 106194680 B CN106194680 B CN 106194680B
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Abstract
The invention discloses a kind of axial plunger pump installation of high-precision electric proportional control and control method, forming includes electric proportional control valve (3) and the main pump body with inlet port (S) and actuator port (B), the variable cylinder small end (M) of main pump body, the big end of variable cylinder (N) is connected with electric proportional control valve (3), it is the thrust that adoption rate electromagnet changes into the signal of input on magnetic bar that pressure shut-off valve (19) control method is parallel with electric proportional control valve (3), electromagnetic force and swash plate rotation are established at automatically controlled valve element both ends makes feedback spring form equilibrium relation between producing thrust, discharge capacity is carried out according to the change of electric current continuous, proportional regulation.The present invention can not only realize the stabilization of the discharge capacity of main pump and accurate control, and simple in construction, strong interference immunity.
Description
Technical field
The present invention relates to a kind of power-equipment, the axial plunger pump installation of particularly a kind of high-precision electric proportional control and control
Method processed.
Background technology
In elevator and rotary machine, to meet that accurate control of the main frame to main pump output flow, especially main frame perform
To avoid system pressure and flow attack during the action launching stage, the accurately control to main pump swash plate pivot angle is of crucial importance；It is required that
Control valve can accurately control the discharge capacity of main pump, and at present, existing clino-axis type ratio plunger pump distributing construction can produce larger flow
Pulsation and pressure fluctuation, disturb larger and stroking mechanism complicated huge control, common inclined disc type electric-hydraulic proportion pump is using single
Cylinder Displacement Feedback, in-cylinder pressure is very low, and control accuracy is easily disturbed by housing return pressure, and precision is poor.
The content of the invention
It is an object of the present invention to provide a kind of axial plunger pump installation of high-precision electric proportional control and control method.
The present invention can not only realize the stabilization of the discharge capacity of main pump and accurate control, and simple in construction, strong interference immunity.
Technical scheme：A kind of axial plunger pump installation of high-precision electric proportional control, it is characterised in that：Including
Electric proportional control valve and the main pump body with inlet port and actuator port, the big end of the variable cylinder small end of main pump body, variable cylinder and electricity
Proportional control valve is connected, and pressure shut-off valve is parallel with electric proportional control valve.
In the axial plunger pump installation of foregoing high-precision electric proportional control, the electric proportional control valve is also associated with external control
Pressure oil circuit, external control pressure oil circuit one end are provided with the outer pressure control with check valve C through check valve A connection actuator ports, the other end
Power hydraulic fluid port.
In the axial plunger pump installation of foregoing high-precision electric proportional control, the electric proportional control valve includes being arranged on electricity
The automatically controlled valve element in valve body is controlled, automatically controlled valve element one end is provided with electromagnet, and middle part is provided with automatically controlled valve element step, and the other end is provided with feedback
Spring, feedback spring are connected with feedback rod, shifting block, connection sheet in turn, and connection sheet is connected with swash plate.
In the axial plunger pump installation of foregoing high-precision electric proportional control, regulation bullet is connected with the feedback spring
Spring, regulation spring are provided with adjusting screw.
In the axial plunger pump installation of foregoing high-precision electric proportional control, the pressure shut-off valve includes valve body, valve body
Interior to be provided with pressure cut off valve element, valve body-side sets check valve B.
According to the control method of the axial plunger pump installation of foregoing high-precision electric proportional control, it is characterised in that：Using
Proportion electro-magnet changes into the signal of input the thrust of magnetic bar, and electromagnetic force and swash plate rotation are established at automatically controlled valve element both ends to be made instead
Feedback spring forms equilibrium relation between producing thrust, and continuous, proportional regulation is carried out to discharge capacity according to the change of electric current.
In the control method of the axial plunger pump installation of foregoing high-precision electric proportional control, the input electricity of electromagnet is controlled
Stream gradually increase, automatically controlled valve element step left side valve port are closed, and the pressure oil at the big end of entering variable cylinder is cut off, meanwhile, electrically-controlled valve
To be opened on the right side of core step, force big end pressure to decline, swash plate rotates to angular direction is put on, after swash plate rotation, the company of passing sequentially through
The angular displacement of swash plate is changed into straight-line displacement by contact pin, shifting block, feedback rod, and feedback spring power increases with the increase of straight-line displacement amount
Greatly, closed on the right side of automatically controlled valve element step, until swash plate both ends variable cylinder forms new dynamic balance state；Control the input of electromagnet
Electric current is gradually reduced, and is closed on the right side of automatically controlled valve element step, is opened on the left of automatically controlled valve element step, and hydraulic oil passes through automatically controlled valve element step
The left side big end of entering variable cylinder.
In the control method of the axial plunger pump installation of foregoing high-precision electric proportional control, in outer governor pressure oil circuit and work
Make that check valve A and external control hydraulic fluid port setting check valve C is installed between hydraulic fluid port, when the pressure of external control hydraulic fluid port is more than or equal to actuator port
Pressure when, check valve C open, check valve A close, swash plate control oil sources for external control hydraulic fluid port pressure oil；When actuator port
Check valve A is opened when pressure is more than the pressure of external control hydraulic fluid port, and check valve C is closed, and it is actuator port that swash plate now, which controls oil sources,
Pressure oil so that control it is more accurate.
In the control method of the axial plunger pump installation of foregoing high-precision electric proportional control, changed by adjusting screw anti-
Present spring and adjust the common pretightning force of spring, pretightning force is bigger, and starting point is higher, and pretightning force is smaller, and starting point is lower.
In the control method of the axial plunger pump installation of foregoing high-precision electric proportional control, realized using pressure shut-off valve
Self-protection when causing system pressure to rise when electric current rises and increases discharge capacity；Pressure shut-off valve is ensured using check valve B
It is not interfere with each other at work with electric proportional control valve.
Compared with prior art, the present invention only needs to carry out coding-control to the input current of main pump, so that it may is pressed by program
The various operating modes of main frame are controlled to main pump, and this can realize the accurate intelligentized control method of main frame, while set pressure shut-off valve
System is protected.
The present invention can start moment in hoisting heavy or engineering machinery upper-part rotation, under load effect, provide main pump
One forces load slow start compared with low discharge, avoids the fast lifting of system pressure, causes the vibrations of main machine structure, make operation
Person does not feel like oneself and is difficult to control, and the present invention can not only realize the stabilization of the discharge capacity of main pump and accurate control, and simple in construction,
Strong interference immunity.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of the specific embodiment of the present invention；
Fig. 3 is the structural representation of electric proportional control valve；
Fig. 4 is the structural representation of pressure shut-off valve.
Mark in accompanying drawing for：1- rotor assembly, 2- plunger assemblies, 3- electric proportional control valves, 4- ball pivot Anchor plate kits, 5-
Swash plate, 6- connection sheets, 7- feedback rods, 8- shifting blocks, 9- electromagnet, the automatically controlled valve elements of 10-, the automatically controlled valve element steps of 101-, 11- feedback bullets
Spring, 12- regulation springs, 13- adjusting screws, 14- valve bodies, 15- check valves B, 16- pressure cut off valve element, 17- check valves A, 18-
Check valve C, 19- pressure shut-off valve, M- variable cylinder small ends, the big end of N- variable cylinders, B- actuator ports, S- inlet ports, the outer pressure controls of X-
Power hydraulic fluid port, L, L1- oil return opening.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to
According to.
Embodiment.A kind of axial plunger pump installation of high-precision electric proportional control, form as shown in figure 1, including electric ratio
Control valve 3 and the main pump body with inlet port S and actuator port B, the big end N of the variable cylinder small end M of main pump body, variable cylinder and electric ratio
Example control valve 3 is connected, and pressure shut-off valve 19 is parallel with electric proportional control valve 3.
Concrete structure of the present invention can be as shown in Fig. 2 main pump body may include rotor assembly 1, plunger group 2 and ball pivot Anchor plate kit
4, electric proportional control valve 3 forms one with main pump body.
The electric proportional control valve 3 is also associated with external control pressure oil circuit, and external control pressure oil circuit one end is through check valve A17 connections
Actuator port B, the other end are provided with the external control pressure oil port X with check valve C18.
Form as shown in figure 3, the electric proportional control valve 3 includes being arranged on automatically controlled valve element 10 in electrically-controlled valve body, it is automatically controlled
The one end of valve element 10 is provided with electromagnet 9, and middle part is provided with automatically controlled valve element step 101, and the other end is provided with feedback spring 11, feedback spring 11
It is connected with feedback rod 7, shifting block 8, connection sheet 6 in turn, connection sheet 6 is connected with swash plate 5.Regulation is connected with the feedback spring 11
Spring 12, regulation spring 12 are provided with adjusting screw 13.
Forming as shown in figure 4, the pressure shut-off valve 19 includes valve body 14, valve body 14 is interior to be provided with pressure cut off valve element 16,
The sidepiece of valve body 14 sets check valve B16.
The control method of the axial plunger pump installation of high-precision electric proportional control, adoption rate electromagnet is by the signal of input
The thrust of magnetic bar is changed into, electromagnetic force and swash plate rotation are established at automatically controlled valve element both ends makes feedback spring produce shape between thrust
Into equilibrium relation, continuous, proportional regulation is carried out to discharge capacity according to the change of electric current.
Specifically, controlling the input current of electromagnet gradually increases, and valve port is closed on the left of automatically controlled valve element step, entering variable
The pressure oil at the big end of cylinder is cut off, meanwhile, opened on the right side of automatically controlled valve element step, force big end pressure to decline, swash plate is to big swing angle
Direction rotates, and after swash plate rotation, passes sequentially through connection sheet, shifting block, feedback rod and the angular displacement of swash plate is changed into straight-line displacement,
Feedback spring power increases with the increase of straight-line displacement amount, is closed on the right side of automatically controlled valve element step, until swash plate both ends variable cylinder shape
Cheng Xin dynamic balance state；The input current of control electromagnet is gradually reduced, and is closed on the right side of automatically controlled valve element step, automatically controlled valve element platform
Opened on the left of rank, hydraulic oil is by the big end of entering variable cylinder on the left of automatically controlled valve element step.In outer governor pressure oil circuit and actuator port
Between check valve A and external control hydraulic fluid port are installed check valve C are set, when the pressure of external control hydraulic fluid port is more than or equal to the pressure of actuator port
When, check valve C is opened, and check valve A is closed, and swash plate controls the pressure oil that oil sources is external control hydraulic fluid port；When the pressure of actuator port is big
Check valve A is opened when the pressure of external control hydraulic fluid port, and check valve C is closed, and swash plate now controls the pressure that oil sources is actuator port
Oil so that control is more accurate.Feedback spring is changed by adjusting screw and adjusts the common pretightning force of spring, pretightning force is got over
Greatly, starting point is higher, and pretightning force is smaller, and starting point is lower.Realized using pressure shut-off valve when electric current rising increases discharge capacity
Self-protection when causing the system pressure to rise.Ensure pressure shut-off valve with electric proportional control valve at work using check valve B
It does not interfere with each other.
The present invention need to introduce external control pressure oil in order that control of the oil pump capacity when outlet pressure is relatively low is more accurate,
The oil sources should control swash plate pivot angle, can not lead to again with outlet oil duct, therefore, be disposed between outer governor pressure oil and pump discharge oil
Check valve A and external control hydraulic fluid port set check valve C, and when external control pressure oil is more than or equal to outlet pressure oil, check valve C is beaten
Open, check valve A is closed, and it is external control pressure oil that swash plate, which controls oil sources,；When outlet pressure oil is more than external control pressure oil, check valve A is beaten
Open, check valve C is closed, and swash plate now controls oil sources as pump discharge pressure oil.
Electromagnet powers off or during less than variable threshold value, and outer oil-control is big by entering variable cylinder on the left of automatically controlled valve element step
End, because the big end of variable cylinder and variable cylinder small end have difference in areas, under the active force of pressure oil, swash plate is pushed to zero pivot angle,
Now pump output flow is 0.
When electromagnet input current gradually increases, valve port is closed on the left of automatically controlled valve element step, the big end of entering variable cylinder
Pressure oil is cut off, meanwhile, opened on the right side of automatically controlled valve element step, force big end pressure to decline, because variable cylinder small end is exported
The active force of pressure oil, can cause swash plate both ends force unbalance, and swash plate after swash plate rotation, leads to angular direction rotation is put on
Cross connection sheet, shifting block, feedback rod and the angular displacement of swash plate changed into straight-line displacement, feedback spring power with straight-line displacement amount increase
And increase, closed on the right side of valve element step, until swash plate both ends variable cylinder establishes new dynamic balance state, when the input electricity of electromagnet
When stream is gradually reduced, automatically controlled valve element step left and right sides valve port opening and closing is switched, and is closed on the right side of automatically controlled valve element step, electrically-controlled valve
Opened on the left of core step, hydraulic oil is by the big end of entering variable cylinder on the left of automatically controlled valve element step.One current value, corresponding one tiltedly
Disk pivot angle, while an also corresponding discharge capacity, the size of electric current, determine the size of the pivot angle of swash plate, the consecutive variations of electric current, reality
The stepless variable of pump is showed.
Electric current section corresponding to from zero delivery to maximum pump discharge, determined by feedback spring rigidity, and spring rate
Design then selects according to the power output of electromagnet and current characteristics, and spring rate is bigger, and output flow is from 0 to the section of set solid amount
It is longer, conversely, it is then shorter, to change rising for electric current section and adjust point, feedback spring and regulation bullet can be changed by adjusting screw
The common pretightning force of spring, pretightning force is bigger, and starting point is higher, and pretightning force is smaller, and starting point is lower.
System pressure is caused to rise, it is necessary to pressure cut off realizes self-protection when electric current, which rises, increases discharge capacity, then,
Pressure shut-off valve of the invention in parallel, can be respectively in order to ensure pressure shut-off valve and electric proportional control valve are not interfere with each other at work
From specific function is realized, check valve B is disposed in product design, when pressure shut-off valve is not opened, check valve B, which is in, closes shape
State, pressure shut-off valve now do drainback passage use；After pressure shut-off valve is opened, check valve B is opened, now, no matter electric
Control valve element is in any position by the function of current, and swash plate will all be pushed into 0 pivot angle in the presence of hydraulic coupling, and realize pressure cut off.
Claims (6)
- A kind of 1. axial plunger pump installation of high-precision electric proportional control, it is characterised in that：Including electric proportional control valve (3) and tool There are the main pump body of inlet port (S) and actuator port (B), variable cylinder small end (M), the big end of variable cylinder (N) and the electric ratio of main pump body Control valve (3) is connected, and pressure shut-off valve (19) is parallel with electric proportional control valve (3)；The electric proportional control valve (3) is also associated with external control pressure oil circuit, and external control pressure oil circuit one end is through check valve A (17) connections Actuator port (B), the other end are provided with the external control pressure oil port (X) with check valve C (18)；The electric proportional control valve (3) includes the automatically controlled valve element (10) being arranged in electrically-controlled valve body, and automatically controlled valve element (10) one end is set There is electromagnet (9), middle part is provided with automatically controlled valve element step (101), and the other end is provided with feedback spring (11), and feedback spring (11) is successively Feedback rod (7), shifting block (8), connection sheet (6) are connected with, connection sheet (6) is connected with swash plate (5)；Connect on the feedback spring (11) Regulation spring (12) is connected to, regulation spring (12) is provided with adjusting screw (13)；The pressure shut-off valve (19) includes valve body (14), and pressure cut off valve element (16), valve body (14) side are provided with valve body (14) Portion sets check valve B (16).
- 2. the control method of the axial plunger pump installation of high-precision electric proportional control according to claim 1, its feature exist In：Adoption rate electromagnet changes into the signal of input the thrust of magnetic bar, and electromagnetic force and swash plate are established at automatically controlled valve element both ends Rotation makes feedback spring form equilibrium relation between producing thrust, discharge capacity is carried out according to the change of electric current continuous, proportional Regulation.
- 3. the control method of the axial plunger pump installation of high-precision electric proportional control according to claim 2, its feature exist In：The input current of control electromagnet gradually increases, and valve port is closed on the left of automatically controlled valve element step, the pressure at the big end of entering variable cylinder It is oily to be cut off, meanwhile, opened on the right side of automatically controlled valve element step, force big end pressure to decline, swash plate rotates to angular direction is put on, swash plate After rotation, pass sequentially through connection sheet, shifting block, feedback rod and the angular displacement of swash plate changed into straight-line displacement, feedback spring power with The increase of straight-line displacement amount and increase, closed on the right side of automatically controlled valve element step, until swash plate both ends variable cylinder forms new dynamic balance State；The input current of control electromagnet is gradually reduced, and is closed on the right side of automatically controlled valve element step, is opened on the left of automatically controlled valve element step, Hydraulic oil is by the big end of entering variable cylinder on the left of automatically controlled valve element step.
- 4. the control method of the axial plunger pump installation of high-precision electric proportional control according to claim 2, its feature exist In：Check valve A is installed between outer governor pressure oil circuit and actuator port and external control hydraulic fluid port sets check valve C, when external control hydraulic fluid port When pressure is more than or equal to the pressure of actuator port, check valve C is opened, and check valve A is closed, and it is external control hydraulic fluid port that swash plate, which controls oil sources, Pressure oil；When the pressure of actuator port is more than the pressure of external control hydraulic fluid port, check valve A is opened, and check valve C is closed, now oblique Disk controls the pressure oil that oil sources is actuator port so that control is more accurate.
- 5. the control method of the axial plunger pump installation of high-precision electric proportional control according to claim 2, its feature exist In：Feedback spring is changed by adjusting screw and adjusts the common pretightning force of spring, pretightning force is bigger, and starting point is higher, pretension Power is smaller, and starting point is lower.
- 6. the control method of the axial plunger pump installation of high-precision electric proportional control according to claim 2, its feature exist In：Self-protection when causing system pressure to rise when electric current rises and increases discharge capacity is realized using pressure shut-off valve；Using Check valve B ensures that pressure shut-off valve is not interfere with each other at work with electric proportional control valve.
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| CN201610736360.7A CN106194680B (en) | 2016-08-28 | 2016-08-28 | The axial plunger pump installation and control method of a kind of high-precision electric proportional control |
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| CN201610736360.7A CN106194680B (en) | 2016-08-28 | 2016-08-28 | The axial plunger pump installation and control method of a kind of high-precision electric proportional control |
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| CN106194680B true CN106194680B (en) | 2018-02-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106762970B (en) * | 2016-12-26 | 2019-06-28 | 中航力源液压股份有限公司 | A kind of double ratio control structures and control method of variable displacement motor |
| CN108425894B (en) * | 2018-05-21 | 2023-10-31 | 宜昌三峡通航工程技术有限公司 | Hydraulic device for realizing synchronous control and adapting to dynamic load |
| CN110748469B (en) * | 2019-10-30 | 2021-09-07 | 佛山市科达液压机械有限公司 | Control method and device of variable plunger pump and variable plunger pump |
| CN110848111B (en) * | 2019-11-27 | 2021-09-10 | 力源液压（苏州）有限公司 | Plunger variable pump integrated control system |
| CN112249907A (en) * | 2020-11-11 | 2021-01-22 | 力源液压（苏州）有限公司 | Plunger pump composite control regulator and hoisting machinery |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956686A (en) * | 2010-10-21 | 2011-01-26 | 吴赛珍 | Position-spring-force feedback type electric proportional variable axial plunger pump |
| CN204099146U (en) * | 2014-07-11 | 2015-01-14 | 北京航天发射技术研究所 | Hydraulic variable displacement pump |
| CN104847613A (en) * | 2015-04-13 | 2015-08-19 | 徐州重型机械有限公司 | Swash plate axial hydraulic plunger pump or motor |
| CN105134578A (en) * | 2015-07-30 | 2015-12-09 | 徐州重型机械有限公司 | Plunger pump with energy recycling function |
| CN105275900A (en) * | 2015-11-26 | 2016-01-27 | 徐州重型机械有限公司 | Fluid machine |
| CN205918570U (en) * | 2016-08-28 | 2017-02-01 | 中航力源液压股份有限公司 | Axial plunger pump device of high accuracy electric proportional control |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0849658A (en) * | 1994-08-05 | 1996-02-20 | Sumitomo Constr Mach Co Ltd | Swash plate control device for variable displacement pump |
| JP2008303813A (en) * | 2007-06-08 | 2008-12-18 | Caterpillar Japan Ltd | Variable displacement pump control device |
-
2016
- 2016-08-28 CN CN201610736360.7A patent/CN106194680B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956686A (en) * | 2010-10-21 | 2011-01-26 | 吴赛珍 | Position-spring-force feedback type electric proportional variable axial plunger pump |
| CN204099146U (en) * | 2014-07-11 | 2015-01-14 | 北京航天发射技术研究所 | Hydraulic variable displacement pump |
| CN104847613A (en) * | 2015-04-13 | 2015-08-19 | 徐州重型机械有限公司 | Swash plate axial hydraulic plunger pump or motor |
| CN105134578A (en) * | 2015-07-30 | 2015-12-09 | 徐州重型机械有限公司 | Plunger pump with energy recycling function |
| CN105275900A (en) * | 2015-11-26 | 2016-01-27 | 徐州重型机械有限公司 | Fluid machine |
| CN205918570U (en) * | 2016-08-28 | 2017-02-01 | 中航力源液压股份有限公司 | Axial plunger pump device of high accuracy electric proportional control |
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Application publication date: 20161207 Assignee: Suzhou Liyuan Hydraulic Co.,Ltd. Assignor: AVIC LIYUAN HYDRAULIC Co.,Ltd. Contract record no.: X2023520000007 Denomination of invention: A high-precision electric proportional control axial piston pump device and control method Granted publication date: 20180206 License type: Exclusive License Record date: 20230606 |
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