CN106762926B - The electrohydraulic controlling mechanism of pressure-adjustable and off-load - Google Patents
The electrohydraulic controlling mechanism of pressure-adjustable and off-load Download PDFInfo
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- CN106762926B CN106762926B CN201611059154.3A CN201611059154A CN106762926B CN 106762926 B CN106762926 B CN 106762926B CN 201611059154 A CN201611059154 A CN 201611059154A CN 106762926 B CN106762926 B CN 106762926B
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- pressure
- chamber
- variable pump
- hydraulic oil
- servo piston
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Classifications
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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
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/28—Control of machines or pumps with stationary cylinders
- F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
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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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more 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
- F15B13/16—Special measures for feedback, e.g. by a follow-up device
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses the electrohydraulic controlling mechanisms of a kind of pressure-adjustable and off-load, it include: the first servo unit, fixed pressure reducing valve, off-load unit and electromagnet pair, the fixed pressure reducing valve to generate pressure difference, to generate pressure signal, the pressure signal is converted to the mechanical signal of the first servo unit, to control the discharge capacity of plunger variable pump.The present invention is due to being provided with fixed pressure reducing valve, so that system pressure and plunger variable pump establish servo relationship, so that plunger variable be enable to be adjusted according to column system pressure.In addition, off-load unit can enable entire hydraulic system trouble free service, and electromagnet can be improved pressure controlled sensitivity or pressure regulation spectrum.
Description
Technical field
The present invention relates to field of electromechanical technology more particularly to the electrohydraulic controlling mechanisms of a kind of pressure-adjustable and off-load.
Background technique
In fluid power system and hydraulic control system (the two might as well be referred to as hydraulic system), system pressure or work pressure
The size of power is by multiple units or system co- controlling and determines, for example, in general, the discharge capacity such as variable pump does not vary widely
When, the system pressure of hydraulic system is mainly limited by overflow valve, when system pressure is more than the control pressure of overflow valve, overflow valve
So that pressure is revert to the system pressure of setting and to fuel tank draining, and is to have by the fluctuation of overflow valve control system pressure
Limit, in other words, when the discharge capacity of variable pump varies widely, if the discharge capacity of variable pump becomes larger, even if overflow valve is constantly let out
System pressure will not be reduced to setting pressure by oil, and so overflow valve will soon damage.Therefore, it is necessary to regulated variable pumps
Discharge capacity.
Occur the mechanism and method of a variety of adjustings or change variable pumpage, e.g., plunger variable pump in the prior art
Discharge capacity can be changed by changing the gradient of swash plate, the gradient of swash plate is adjusted by being provided with the servo piston of connecting rod, specifically,
Servo piston is arranged in servo piston chamber, and connecting rod stretches out from one end of servo piston chamber and pass through flexible change swash plate gradient,
Servo piston chamber is drawn hydraulic oil all the way from the oil outlet of plunger variable pump and is passed through not with spring is provided in the chamber of connecting rod
Have in the chamber of piston rod, the stroke that connecting rod is changed by the hydraulic fluid pressure size, thus change the gradient of swash plate, into
And change the discharge capacity of plunger variable pump.However, this method can only be simple the discharge capacity for changing variable pump, can only be used in
Known or precognition system needed under discharge capacity, for the substantially discharge capacity of regulated variable pump before using variable pump, this method is simultaneously
Not according to the discharge capacity of system pressure real-time regulated variable pump so that the discharge capacity of variable pump meets operating pressure requirement, in other words this
Kind method can only make the discharge capacity after adjusting generally conform to system requirements, and precision is poor.
The method of another pilot plunger variable pump is had also appeared in the prior art, on the one hand, is obtained by angular transducer
The gradient of the swash plate of variable pump is obtained, which passes to electromagnetic controller for steepness signals, have in electromagnetic controller
With the one-to-one electric signal of gradient；On the other hand, the hydraulic oil two-way of system respectively enters two chambers divided by piston
In, the connecting rod on the piston passes through with the mobile gradient for changing swash plate of piston；When controller needs to change the row of variable pump
When amount, controller changes the pressure of two-way hydraulic oil, to change the displacement of piston, and then changes the discharge capacity of variable pump.So
And this method only keeps the gradient of the swash plate of variable pump associated with the electric signal of controller, and the pressure of hydraulic system is
As the simple power for changing piston transverse shifting, and it is associated there is no the discharge capacity with variable pump, to make this method
The discharge capacity that cannot be pumped according to system pressure come regulated variable, so that the discharge capacity after adjusting can only be made to generally conform to system requirements, essence
It spends poor.
Summary of the invention
For the above-mentioned technical problems in the prior art, the embodiment provides a kind of in real time according to being
The discharge capacity of the pressure signal regulated variable pump for hydraulic oil feedback of uniting is so that system pressure meets pressure-adjustable and the off-load of predetermined pressure
Electrohydraulic controlling mechanism.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of pressure-adjustable and the electrohydraulic controlling mechanism of off-load are used for hydraulic to adjust by the discharge capacity for changing plunger variable pump
The pressure of system, comprising:
First servo unit comprising be formed with the first shell of first chamber, be arranged in the first chamber, and will
The first chamber is divided into the first servo piston of the first left chamber and the first right chamber；It is provided in first left chamber
For pushing against the first spring of first servo piston, wherein
The movement of first servo piston and the gradient of the swash plate of the plunger variable pump are configured to following interaction relation:
When first servo piston is moved to the left, first servo piston makes the swash plate of the plunger variable pump
Gradient reduce；When first servo piston moves right, first servo piston makes the plunger variable pump
The gradient of swash plate increases；Wherein:
The pressure-adjustable and the electrohydraulic controlling mechanism of off-load further include
Fixed pressure reducing valve, system hydraulic oil are divided into two-way and each lead into first left chamber and first right chamber,
The fixed pressure reducing valve is arranged on the pipeline for being passed through first left chamber, so that the indoor hydraulic oil of the first left chamber
Pressure is kept constant, so that the pressure of the pressure of the indoor hydraulic oil of the first right chamber and the indoor hydraulic oil of the first left chamber
The difference of power increases with the increase of the pressure of system hydraulic oil；
Off-load unit is used to force the swash plate of the plunger variable pump when system pressure exceeds default peak
Gradient zero；
The opposite electromagnet pair of homopolarity is arranged in first left chamber, and the electromagnet is to by changing thereon
Electric current is to change the electromagnetic push to first servo piston.
Preferably, further include the second servo unit and control unit, be provided with the first push rod on first servo piston；
Second servo unit includes the second shell for being formed with second chamber, is arranged in the second chamber, and
The second chamber is divided into the second servo piston of the second left chamber and the second right chamber and is arranged and is watched described second
The second push rod on piston is taken, second spring is provided in second left chamber, second push rod is connect with the swash plate,
And:
When second push rod is moved to the left, second push rod drives the gradient of the swash plate to reduce, and described second
Push rod to the right when, second push rod drives the gradient of the swash plate to increase；
Described control unit includes the spool for being formed with the valve body of valve chamber and being arranged in the valve chamber, the spool by
The first push rod driving, and system hydraulic oil passes through described control unit to the second right chamber fuel feeding, so that:
When first push rod is moved to the left, first push rod drives the spool movement so that second right chamber
The pressure of indoor hydraulic oil increases；When first push rod moves right, first push rod drives the spool mobile
So that the pressure of the indoor hydraulic oil of the second right chamber reduces.
Preferably, described control unit is proportional reversing valve, the oil outlet of the proportional reversing valve and second right chamber
Room connection, oil inlet are connected to system hydraulic oil, and when the spool is moved to the left, and the pressure of the hydraulic oil of oil outlet increases
So that the pressure of the indoor hydraulic oil of the second right chamber increases；When the spool moves right, the hydraulic oil of oil outlet
Pressure reduces so that the pressure of the indoor hydraulic oil of the second right chamber reduces.
Preferably, the off-load unit is that oil inlet is connected to system pipeline, and oil outlet is connected to second right chamber
Individual event valve, the setting pressure of the check valve is greater than the rated pressure of hydraulic system.
Compared with prior art, the electrohydraulic controlling mechanism of pressure-adjustable and off-load provided by the embodiment of the present invention is beneficial
Effect is: the present invention is due to being provided with fixed pressure reducing valve, so that system pressure and plunger variable pump establish servo relationship, thus
Plunger variable is set to be adjusted according to column system pressure.In addition, off-load unit can enable the safe work of entire hydraulic system
Make, and electromagnet can be improved pressure controlled sensitivity or pressure regulation spectrum.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the electrohydraulic controlling mechanism of pressure-adjustable of the invention and off-load.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
Formula elaborates to the present invention.
The electrohydraulic controlling mechanism objects, technical solutions and advantages of pressure-adjustable of the invention and off-load for convenience of explanation,
Before the electrohydraulic controlling mechanism for introducing pressure-adjustable and off-load of the invention, which kind of side introduces first in the prior art is by
Formula come change variable pump discharge capacity and the main Ying Yu of this kind of mode in which kind of situation.
Variable pump in the prior art, especially plunger variable pump 50 are usually become by changing the gradient of swash plate 51 to change
The discharge capacity for measuring pump needs the flow according to hydraulic system to hydraulic oil before variable pump is accessed hydraulic system as power source
It is required that, system pressure requirements and operating pressure require that the discharge capacity of variable pump is adjusted, that is to say, that the oblique of variable pump
The gradient of disk 51 is adjusted, so that the discharge capacity of variable pump generally conforms to the requirement of hydraulic system, to make variable pump access system
After system, the pressure remained steady of hydraulic system.
Under normal conditions, flow, system pressure and the operating pressure of the discharge capacity and hydraulic system of variable pump are to be positively correlated
, that is to say, that in same hydraulic system, the discharge capacity of variable pump is bigger, flow, system pressure and the work of hydraulic system
Pressure is also bigger, otherwise smaller.After the discharge capacity of variable pump determines, flow, system pressure and the work pressure of hydraulic system
Power can be determined substantially in a certain range.However, the discharge capacity of variable pump and do not have with the flow of hydraulic system, system pressure with
And the completely corresponding relationship of operating pressure, for example, system pressure does not have and the discharge capacity simultaneously when the discharge capacity of variable pump is Xv/s
Unique corresponding one determines pressure, and system pressure at this time may change or fluctuate in a big way, and this fluctuation
The range that may allow beyond system pressure, e.g., rated pressure beyond system (under the rated pressure, each member of system
Device could work normally).So that the discharge capacity and the flow of hydraulic system of variable pump, system pressure and operating pressure are incomplete
Corresponding one it is critically important the reason is that: in system each Hydraulic Elements draining, oil leak and Hydraulic Elements to hydraulic oil generate not
Variation and the aging of Hydraulic Elements of evitable resistance etc..
And discharge capacity and the system parameters of variable pump are all built upon for one by one to the adjusting of hydraulic system in the prior art
What the case where corresponding relationship, carried out, for example, be intended to adjust system pressure to a certain pressure value, it only need to be by the swash plate 51 of variable pump
Pitch adjustment to a certain discharge capacity of the unique corresponding variable pump of the pressure value.That is, only needing swash plate 51 individually
Adjust a certain predetermined slant.
For example, the gradient of swash plate 51 is adjusted by being provided with the servo piston of connecting rod, specifically, servo piston setting is being watched
It takes in plunger shaft, connecting rod stretches out from one end of servo piston chamber and passes through flexible change 51 gradient of swash plate, and servo piston chamber has
It is provided with spring in the chamber of connecting rod, draws the chamber that hydraulic oil all the way is passed through not piston rod from the oil outlet of plunger variable pump 50
In room, the stroke for changing connecting rod by the hydraulic fluid pressure size to change the gradient of swash plate 51, and then changes plunger
The discharge capacity of variable pump 50.
For another example on the one hand, the gradient of the swash plate 51 of variable pump is obtained by angular transducer, which will be oblique
Degree signal passes to electromagnetic controller, has and the one-to-one electric signal of gradient in electromagnetic controller；On the other hand, system
Hydraulic oil two-way respectively enters in two chambers by piston segmentation, connecting rod on the piston by with piston it is mobile for changing
The gradient of swash plate 51；When controller needs to change the discharge capacity of variable pump, controller changes the pressure of two-way hydraulic oil, to change
Become the displacement of piston, and then changes the discharge capacity of variable pump.
Above two method be built upon variable pump discharge capacity and system parameters be one-to-one relationship the case where into
Capable, however, it can be seen from the above, the discharge capacity of variable pump is with system parameters because many factors do not constitute completely corresponding pass
System, so that the discharge capacity for changing variable pump that this method can only be simple, can only be used in and know or predicting system
Needed for uniting under discharge capacity, the substantially discharge capacity of regulated variable pump before using variable pump.
In above-mentioned method of adjustment in the prior art, system hydraulic oil is intended only as changing piston transverse shifting merely
Power, and there is no the discharge capacity with variable pump is associated.Entire adjustment process relies on controller completely and feeds back to controller
The gradient of swash plate 51 carry out, being adjusted in real time according to hydraulic system pressure, mutually isolated with hydraulic system.
One bigger drawback of above-mentioned adjusting method is: since variable pump is used for a long time, a certain gradient of swash plate 51
Corresponding discharge capacity can change, so that the discharge capacity of the numerical value stored in controller and variable pump is made to generate deviation, so that:
When controller issues the instruction that the adjusting of swash plate 51 makes variable pump adjusting to corresponding discharge capacity to a certain gradient, on variable pump
Although swash plate 51 adjust and arrive predetermined slant, discharge capacity is not up to pre- fixed displacement.
The degree of regulation for carrying out the method for regulating system pressure above by the discharge capacity that regulated variable pumps is inadequate or tune is not achieved
The expected reason of section is: the discharge capacity of variable pump according to system pressure being adjusted, and only simple regulated variable
The discharge capacity of pump.The purpose of electrohydraulic controlling mechanism of pressure-adjustable and off-load of the invention is the pressure and variable pump for establishing hydraulic system
The relationship of discharge capacity, that is, establishing adjusts the discharge capacity of variable pump carries out according to system pressure, and energy again after the discharge capacity adjusting of variable pump
Enough influence the servo relationship of system pressure.
As shown in Figure 1, embodiment of the invention discloses the electrohydraulic controlling mechanisms of a kind of pressure-adjustable and off-load, for passing through
Change the discharge capacity of plunger variable pump 50 to adjust the pressure of hydraulic system, the electrohydraulic controlling mechanism of the pressure-adjustable and off-load specifically wraps
Include: the first servo unit 10, fixed pressure reducing valve 40, off-load unit and the opposite electromagnet of homopolarity are to 16.
First servo unit 10 includes the first shell for being formed with first chamber, is arranged in first chamber, and by first
Chamber is divided into the first servo piston 13 of the first left chamber 11 and the first right chamber 12；It is provided with and is used in first left chamber 11
Push against the first spring 15 of the first servo piston 13, wherein
The gradient of the swash plate 51 of the movement and plunger variable pump 50 of first servo piston 13 is configured to following interaction relation:
When the first servo piston 13 is moved to the left, the first servo piston 13 makes the oblique of the swash plate 51 of plunger variable pump 50
Degree reduces；When the first servo piston 13 moves right, the first servo piston 13 makes the oblique of the swash plate 51 of plunger variable pump 50
Degree increases；Wherein:
System hydraulic oil is divided into two-way and each leads into the first left chamber 11 and the first right chamber 12, and fixed pressure reducing valve 40 is arranged
On the pipeline for being passed through the first left chamber 11, so that the pressure of the hydraulic oil in the first left chamber 11 is kept constant, so that first
The difference of the pressure of hydraulic oil in the pressure of hydraulic oil in right chamber 12 and the first left chamber 11 with system hydraulic oil pressure
The increase of power and increase.
Off-load unit is used to force the swash plate 51 of plunger variable pump 50 when system pressure exceeds default peak
Gradient zero；
The opposite electromagnet of homopolarity is arranged in the first left chamber 11 to 16, and electromagnet is powered on to 16 by changing it
Stream is to change the electromagnetic push to the first servo piston 13.
In this way, when system pressure increases (for some reason, discharge capacity including plunger variable pump 50 increase, control element
Hydraulic fluid port becomes smaller) when, the pressure of the hydraulic oil in the first right chamber 12 increases, and the pressure of the hydraulic oil in the first left chamber 11
It is constant because being controlled pressure by fixed pressure reducing valve 40, so that the first servo piston 13 is moved to the left, the first servo piston 13
Movement is so that the gradient of the swash plate 51 of plunger variable pump 50 reduces；To which the discharge capacity of plunger variable pump 50 reduces, plunger variable pump
50 discharge capacity offsets the system pressure of rising after reducing.When the first servo piston 13 moves right, the first servo piston 13 makes
The gradient for obtaining the swash plate 51 of plunger variable pump 50 increases；When system pressure reduces (for some reason, including plunger variable pump 50
Discharge capacity reduces, the hydraulic fluid port of control element becomes larger) when, the pressure of the hydraulic oil in the first right chamber 12 reduces, and the first left chamber
The pressure of hydraulic oil in room 11 is because constant by the control of fixed pressure reducing valve 40 pressure, so that the first servo piston 13 moves right
Dynamic, the movement of the first servo piston 13 is so that the gradient of the swash plate 51 of plunger variable pump 50 increases, thus plunger variable pump 50
Discharge capacity increases, and the discharge capacity of plunger variable pump 50 increases the system pressure of post-compensation decline.
The electrohydraulic controlling mechanism of pressure-adjustable and off-load of the invention establish system pressure and 50 discharge capacity of plunger variable pump it
Between relationship so that the change that system pressure only passes through the discharge capacity of plunger variable pump 50 is adjusted, to eliminate adjusting shadow
The process of other Hydraulic Elements of acoustic system pressure, to keep adjustment process simply and accurate.The process simply can be adjusted accurately
The reason of saving system pressure is: although there are many factor for influencing system pressure, system pressure can be become by changing plunger
The discharge capacity of amount pump 50 is changed and adjusts.
The system pressure and 50 discharge capacity of plunger variable pump that the electrohydraulic controlling mechanism of pressure-adjustable and off-load of the invention is established
Between relationship be servo relationship, that is to say, that system pressure can generate pressure signal in real time, the pressure signal directly or
It is converted into mechanical signal and passes to plunger variable pump 50 so that 50 discharge capacity of plunger variable pump changes, and 50 discharge capacity of plunger variable pump changes
Become again can Real Time Effect system pressure, so that system pressure be made to reach a numerical value that is constant and meeting system requirements.
The electrohydraulic controlling mechanism of pressure-adjustable and off-load of the invention changes the row of plunger variable pump 50 according to system pressure
Amount, so that the system pressure after adjusting be made to be more in line with pre-provisioning request.
The electrohydraulic controlling mechanism of pressure-adjustable and off-load of the invention can be according to system pressure pilot plunger variable pump 50
Discharge capacity, and establish system pressure and the key of the servo relationship of plunger variable pump 50 is: it is lead to the first left chamber 11
Road under the overall leadership is arranged fixed pressure reducing valve 40, which be less than the pressure of the hydraulic oil in the first left chamber 11 to be
Pressure of uniting and the definite value changed not change with system pressure, and the pressure of the hydraulic oil in the first right chamber 12 is equal to system
Pressure, so that the pressure initiation of the hydraulic oil in the pressure of the hydraulic oil in the first right chamber 12 and the first left chamber 11
Pressure difference, in predetermined pressure difference, (predetermined pressure difference refers to: system pressure required for hydraulic system, i.e. rated pressure, with
The difference of the pressure of hydraulic oil in one left chamber 11) under, which is offset by the first spring 15, at this point, first
Servo piston 13 remains stationary, and when system pressure is above or below rated pressure, at this point, the first servo piston 13 is in pressure
It moves under the action of difference, changes so that by the movement of the first servo piston 13 gradient occurs for swash plate 51, thus
Change the discharge capacity of plunger variable pump 50, and the change of this discharge capacity can make up for it just or the change of bucking-out system pressure, for example,
When system pressure increases, the first servo piston 13 reduces 50 discharge capacity of plunger variable pump, when the system pressure decreases, first
Servo piston 13 increases 50 discharge capacity of plunger variable pump.
The fixed pressure reducing valve 40 of the electrohydraulic controlling mechanism of pressure-adjustable and off-load of the invention is the decisive of generation pressure difference
Element, and condition under the decision of system pressure and the generation servo relationship of plunger variable pump 50 is made to be exactly 13 both ends of the first servo piston
Produce pressure difference.
The fixed pressure reducing valve 40 of the electrohydraulic controlling mechanism of pressure-adjustable and off-load of the invention also determines the specified pressure of system
Power, that is to say, that under the premise of the coefficient of elasticity of the first spring 15 is certain, when fixed pressure reducing valve 40 sets predetermined value, be
System pressure also determines that reason is: when fixed pressure reducing valve 40 sets predetermined value as A, at this point, system pressure should be equal to
The thrust for being corresponding hydraulic fluid pressure (pressure of the hydraulic oil in the first left chamber 11) FA and the first spring 15 of A with predetermined value
The sum of FB, otherwise the first servo piston 13 can move.That is, after 40 setting value of fixed pressure reducing valve determines, system
Pressure can generate one and setting value corresponding pressure value, conversely, can make system by adjusting 40 setting value of fixed pressure reducing valve
The satisfactory pressure value of pressure.Therefore, the fixed pressure reducing valve 40 of pressure-adjustable of the invention and the electrohydraulic controlling mechanism of off-load is gone back
The function of having regulating system rated pressure.
The electrohydraulic controlling mechanism of pressure-adjustable and off-load of the invention is due to being provided with fixed pressure reducing valve 40, so as to basis
System pressure is accurate and by the discharge capacity for adjusting plunger variable pump 50 repeatedly, to make the adjusting of system pressure fast and accurately
To satisfactory rated pressure, to alleviate the pressure that overflow valve maintains system pressure constant, the suitable of overflow valve is improved
Use the service life.
Above-mentioned electromagnet changes the pretightning force of the first spring 15 by changing electromagnetic push to 16, so that first
Hydraulic pressure increase and decrease amount required for the every Moving Unit of servo piston 13 is displaced changes, in this way, if the electromagnet is to 16
When magnetic repulsion increases, the pretightning force of the first spring 15 reduces, and then makes required for the displacement of 13 Moving Unit of the first servo piston
The increase and decrease amount of hydraulic pressure reduces, in other words every increase and decrease unit hydraulic pressure, and the mobile displacement of the first servo piston 13 is bigger, from
And it is more sensitive that the first servo piston 13 changes hydraulic pressure, to improve the row of pilot plunger variable pump 50 indirectly
The sensitivity of amount；If the magnetic repulsion of the magnet pair reduces, the pretightning force of the first spring 15 increases, and then makes the first servo piston
The increase and decrease amount of hydraulic pressure required for 13 Moving Units are displaced increases, in other words every increase and decrease unit hydraulic pressure, the first servo
The mobile displacement of piston 13 is smaller, even if thus when changing the first servo piston 13 in larger pressure limit, the first servo
Piston 13 can also be in the discharge capacity for forming indirect pilot plunger variable pump 50 in range, to increase the adjusting of system pressure
Range.
Above-mentioned off-load unit effect is: when system pressure increases to the peak of preset pressure because of certain reason
(within the peak, the component of hydraulic system will not be damaged, and the component more than the peak hydraulic system can be sent out
Raw damage), off-load unit makes the gradient of the swash plate 51 of plunger variable pump 50 be zeroed, to make the discharge capacity of plunger variable pump 50 i.e.
Quarter becomes zero, to make system pressure be reduced to zero at once, to timely and effectively protect including plunger variable pump 50
Hydraulic system component.
Preferably, off-load unit is that oil inlet is connected to system pipeline, the individual event that oil outlet is connected to the second right chamber 22
Valve, the setting pressure of check valve 60 are greater than the rated pressure of hydraulic system.In this way, when system pressure is pre- because certain reason increases to
If when the peak of pressure, at this point, system pressure has been more than the setting pressure of check valve 60, individual event valve is connected at once, system liquid
Pressure oil is directly entered the second right chamber 22, pushes the second servo piston 23 to move to left to the leftmost side at once, makes plunger variable pump 50
The gradient of swash plate 51 is zeroed at once, to make the idle running of plunger variable pump 50 without fuel feeding.
To realize the above-mentioned interaction relation of the gradient of the movement of the first servo piston 13 and the swash plate 51 of plunger variable pump 50:
I.e. when the first servo piston 13 is moved to the left, the first servo piston 13 subtracts the gradient of the swash plate 51 of plunger variable pump 50
It is small；When the first servo piston 13 moves right, the first servo piston 13 increases the gradient of the swash plate 51 of plunger variable pump 50
Greatly；
The electrohydraulic controlling mechanism of pressure-adjustable and off-load of the invention further includes the second servo unit 20 and control unit 30, and
The first push rod 14 is provided on one servo piston 13；
Second servo unit 20 includes the second shell for being formed with second chamber, is arranged in second chamber, and by second
Chamber is divided into the second servo piston 23 of the second left chamber 21 and the second right chamber 22 and is arranged in the second servo piston 23
On the second push rod 24, be provided with second spring 25 in the second left chamber 21, the second push rod 24 is connect with swash plate 51, and:
When the second push rod 24 is moved to the left, the second push rod 24 drives the gradient of swash plate 51 to reduce, and the second push rod 24 is to the right
When, the second push rod 24 drives the gradient of swash plate 51 to increase；
Control unit 30 includes the spool 31 for being formed with the valve body of valve chamber and being arranged in valve chamber, and spool 31 is pushed away by first
Bar 14 drives, and system hydraulic oil passes through control unit 30 to 22 fuel feeding of the second right chamber, so that:
When the first push rod 14 is moved to the left, the first push rod 14 moves the liquid so that in the second right chamber 22 with movable valve plug 31
The pressure of pressure oil increases；When the first push rod 14 moves right, the first push rod 14 is mobile so that the second right chamber with movable valve plug 31
The pressure of hydraulic oil in 22 reduces.
In this way, the first push rod 14 is moved to the left when the hydraulic increase of system, the second push rod 24 is made by control unit 30
Also it is moved to the left, so that the gradient of swash plate 51 reduces, the discharge capacity of plunger variable pump 50 reduces；When the hydraulic reduction of system,
First push rod 14 moves right, and by control unit 30 second push rod 24 is also moved right, so that swash plate 51 is oblique
Degree increases, and the discharge capacity of plunger variable pump 50 increases.
In a preferred embodiment of the invention, control unit 30 is proportional reversing valve, the oil outlet of proportional reversing valve
It is connected to the second right chamber 22, oil inlet is connected to system hydraulic oil, and when spool 31 is moved to the left, the hydraulic oil of oil outlet
Pressure increase so that the pressure of hydraulic oil in the second right chamber 22 increases；When spool 31 moves right, the liquid of oil outlet
The pressure of pressure oil reduces so that the pressure of the hydraulic oil in the second right chamber 22 reduces.
Above embodiments are only exemplary embodiment of the present invention, are not used in the limitation present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can within the spirit and scope of the present invention make respectively the present invention
Kind modification or equivalent replacement, this modification or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (4)
1. the electrohydraulic controlling mechanism of a kind of pressure-adjustable and off-load, for adjusting hydraulic pressure system by the discharge capacity for changing plunger variable pump
The pressure of system characterized by comprising
First servo unit comprising be formed with the first shell of first chamber, be arranged in the first chamber, and will be described
First chamber is divided into the first servo piston of the first left chamber and the first right chamber；It is provided with and is used in first left chamber
Push against the first spring of first servo piston, wherein
The movement of first servo piston and the gradient of the swash plate of the plunger variable pump are configured to following interaction relation:
When first servo piston is moved to the left, first servo piston makes the oblique of the swash plate of the plunger variable pump
Degree reduces；When first servo piston moves right, first servo piston makes the swash plate of the plunger variable pump
Gradient increase；Wherein:
The pressure-adjustable and the electrohydraulic controlling mechanism of off-load further include
Fixed pressure reducing valve, system hydraulic oil is divided into two-way and each leads into first left chamber and first right chamber, described
Fixed pressure reducing valve is arranged on the pipeline for being passed through first left chamber, so that the pressure of the indoor hydraulic oil of the first left chamber
It keeps constant, so that the pressure of the indoor hydraulic oil of the first right chamber and the pressure of the indoor hydraulic oil of the first left chamber
Difference increases with the increase of the pressure of system hydraulic oil；
Off-load unit is used to force the gradient of the swash plate of the plunger variable pump when system pressure exceeds default peak
Zero；
The opposite electromagnet pair of homopolarity is set in first left chamber, one of electromagnet of the electromagnet pair
First servo piston is set to towards on one end of first left chamber, the another one electromagnetism of the electromagnet pair
Iron is set in the first shell and opposite with the electromagnet being set on first servo piston, in which:
The electromagnet to by change thereon electric current to change the electromagnetic push to first servo piston.
2. the electrohydraulic controlling mechanism of pressure-adjustable according to claim 1 and off-load, which is characterized in that further include the second servo
Unit and control unit are provided with the first push rod on first servo piston；
Second servo unit includes the second shell for being formed with second chamber, is arranged in the second chamber, and by institute
Stating second chamber is divided into the second servo piston of the second left chamber and the second right chamber and setting living in second servo
The second push rod beyond the Great Wall is provided with second spring in second left chamber, and second push rod is connect with the swash plate, and
And:
When second push rod is moved to the left, second push rod drives the gradient of the swash plate to reduce, second push rod
When to the right, second push rod drives the gradient of the swash plate to increase；
Described control unit includes the spool for being formed with the valve body of valve chamber and being arranged in the valve chamber, and the spool is by described
The driving of first push rod, and system hydraulic oil passes through described control unit to the second right chamber fuel feeding, so that:
When first push rod is moved to the left, first push rod drives the spool movement so that in second right chamber
Hydraulic oil pressure increase；When first push rod moves right, first push rod drive the spool mobile so that
The pressure of the indoor hydraulic oil of second right chamber reduces.
3. the electrohydraulic controlling mechanism of pressure-adjustable according to claim 2 and off-load, which is characterized in that described control unit is
Proportional reversing valve, the oil outlet of the proportional reversing valve are connected to second right chamber, and oil inlet is connected to system hydraulic oil,
And when the spool is moved to the left, the pressure of the hydraulic oil of oil outlet increases so that the indoor hydraulic oil of the second right chamber
Pressure increases；When the spool moves right, the pressure of the hydraulic oil of oil outlet reduces so that second right chamber is indoor
The pressure of hydraulic oil reduces.
4. the electrohydraulic controlling mechanism of pressure-adjustable according to claim 3 and off-load, which is characterized in that the off-load unit is
Oil inlet is connected to system pipeline, the check valve that oil outlet is connected to second right chamber, the setting pressure of the check valve
Greater than the rated pressure of hydraulic system.
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| CN201611059154.3A CN106762926B (en) | 2016-11-22 | 2016-11-22 | The electrohydraulic controlling mechanism of pressure-adjustable and off-load |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107939759B (en) * | 2017-12-18 | 2019-09-03 | 北奔重型汽车集团有限公司 | A kind of non-differential driver's cabin twin-tub hoisting system |
| CH717936A1 (en) * | 2020-10-06 | 2022-04-14 | Liebherr Machines Bulle Sa | Axial piston machine with control valve. |
| CN113530783B (en) * | 2021-07-19 | 2023-06-02 | 中航力源液压股份有限公司 | Two-stage pressure control device with unloading function |
| CN117189727A (en) * | 2023-11-07 | 2023-12-08 | 合肥合锻智能制造股份有限公司 | Moment leveling system control system based on fuzzy PID |
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| CN106762926A (en) | 2017-05-31 |
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Effective date of registration: 20190410 Address after: 226000 No. 118 Nanxi Road, Libao Town, Haian County, Nantong City, Jiangsu Province Applicant after: Nantong Huade Metal Forming Machine Co., Ltd. Address before: 300000 Tianjin Hexi District Huanhu Zhonglu Binhu Building Negative Floor B150 Applicant before: Tianjin Haian science and Technology Co., Ltd. |
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