CN106523457A - Electric hydraulic control mechanism - Google Patents
Electric hydraulic control mechanism Download PDFInfo
- Publication number
- CN106523457A CN106523457A CN201611035936.3A CN201611035936A CN106523457A CN 106523457 A CN106523457 A CN 106523457A CN 201611035936 A CN201611035936 A CN 201611035936A CN 106523457 A CN106523457 A CN 106523457A
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- China
- Prior art keywords
- pressure
- hydraulic oil
- variable pump
- push rod
- chamber
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Classifications
-
- 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
Landscapes
- 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 an electric hydraulic control mechanism which comprises a first servo unit and a constant value reducing valve. A pressure difference is generated by the constant value reducing valve, so that a pressure signal is generated; and the pressure signal is converted into a mechanical signal of the first servo unit, and therefore the displacement of a plunger variable pump is controlled. According to the electric hydraulic control mechanism, the constant value reducing valve is arranged, so that a servo relationship is built between the system pressure and the plunger variable pump, and the plunger variable can be adjusted according to the plunger system pressure.
Description
Technical field
A kind of the present invention relates to field of electromechanical technology, more particularly to electrohydraulic controlling mechanism.
Background technology
In fluid power system and hydraulic control system (both might as well be referred to as hydraulic system), system pressure or work are pressed
The size of power is by multiple units or system co- controlling and determines, for example, generally, the discharge capacity of such as variable pump does not occur large change
When, the system pressure of hydraulic system is mainly limited by overflow valve, when system pressure exceedes the control pressure of overflow valve, overflow valve
The system pressure of setting is revert to by making pressure to fuel tank draining, and the fluctuation for passing through overflow valve control system pressure is that have
Limit, in other words, when the discharge capacity of variable pump occurs large change, such as the discharge capacity of variable pump becomes big, even if overflow valve is constantly let out
System pressure also will not be reduced setting pressure by oil, and so overflow valve will soon be damaged.Accordingly, it would be desirable to regulated variable pump
Discharge capacity.
Various regulations are occurred in that in prior art or claim mechanism and the method for change variable pumpage, e.g., plunger variable pump
Discharge capacity can be changed by the gradient of change swash plate, the gradient of swash plate is provided by the servo piston regulation of connecting rod, specifically,
Servo piston is arranged in servo piston chamber, and connecting rod stretches out and pass through flexible change swash plate gradient from the one end in servo piston chamber,
The within the chamber that servo piston chamber has connecting rod is provided with spring, draws hydraulic oil all the way from the oil-out of plunger variable pump and is passed through not
In having the chamber of piston rod, the stroke of connecting rod is changed by the hydraulic fluid pressure size, so as to change the gradient of swash plate, is entered
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
Know or discharge capacity needed for precognition system under, for the substantially discharge capacity of regulated variable pump before using variable pump, the method is simultaneously
Discharge capacity not according to system pressure real-time regulation variable pump so that the discharge capacity of variable pump meets operating pressure requirement, in other words this
The method of kind can only make the discharge capacity after regulation generally conform to system requirements, and precision is poor.
The method that have also appeared another kind of pilot plunger variable pump in prior art, on the one hand, obtained by angular transducer
The gradient of the swash plate of variable pump is obtained, steepness signals are passed to electromagnetic controller, had in electromagnetic controller by the angular transducer
With the one-to-one signal of telecommunication of gradient；On the other hand, the hydraulic pressure oil two-way of system respectively enters two chambers split by piston
In, the connecting rod on the piston by moving the gradient for changing swash plate with piston；When controller needs to change the row of variable pump
During amount, controller changes the pressure of two-way hydraulic oil, so as to change the displacement of piston, and then changes the discharge capacity of variable pump.So
And, the method simply makes the gradient of swash plate of variable pump be associated with the signal of telecommunication of controller, and the pressure of hydraulic system is
As the simple power for changing piston transverse shifting, and it is not associated with the discharge capacity of variable pump, so that this method
Can not be according to system pressure come the discharge capacity of regulated variable pump, so as to the discharge capacity after regulation can only be made to generally conform to system requirements, essence
Degree is poor.
The content of the invention
For above-mentioned technical problem present in prior art, The embodiment provides one kind is in real time according to being
The discharge capacity of the pressure signal regulated variable pump of system hydraulic oil feedback is so that system pressure meets the electrohydraulic controlling mechanism of predetermined pressure.
For solving above-mentioned technical problem, the technical solution used in the present invention is：
A kind of electrohydraulic controlling mechanism, adjusts the pressure of hydraulic system for by the discharge capacity of change plunger variable pump, wraps
Include：
First servo unit, which includes being formed with the first housing of first chamber, is 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 room；It is provided with the first left chamber room
For pushing against the first spring of first servo piston, wherein,
The action of first servo piston is configured to following interaction relation with the gradient of the swash plate of the plunger variable pump：
When first servo piston is moved to the left, first servo piston causes the swash plate of the plunger variable pump
Gradient reduce；When first servo piston moves right, first servo piston causes the plunger variable pump
The gradient increase of swash plate；Wherein：
The electrohydraulic controlling mechanism also includes
Fixed pressure reducing valve, system hydraulic oil are divided into two-way and each lead into first left chamber and the first right chamber room,
The fixed pressure reducing valve is arranged on and is passed through on the pipeline of first left chamber, so that the hydraulic oil in the first left chamber room
Pressure keeps constant, so that the pressure of the hydraulic oil in the pressure of the hydraulic oil in the first right chamber room and the first left chamber room
The difference of power increases with the increase of the pressure of system hydraulic oil.
Preferably, also the first push rod is provided with including the second servo unit and control unit on first servo piston；
Second servo unit includes being formed with the second housing of 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 room and is arranged on described second and is watched
The second push rod on piston is taken, second spring in the second left chamber room, is provided with, second push rod is connected 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 increase of the swash plate；
Described control unit includes the valve body for being formed with valve pocket and the valve element being arranged in the valve pocket, the valve element by
First push rod drives, and system hydraulic oil passes through described control unit to the second right chamber room fuel feeding, so that：
When first push rod is moved to the left, first push rod drives the valve element to move so that second right chamber
The pressure increase of indoor hydraulic oil；When first push rod moves right, first push rod drives the valve element movement
So that the pressure of the hydraulic oil in the second right chamber room reduces.
Preferably, described control unit is proportional reversing valve, the oil-out of the proportional reversing valve and second right chamber
Room connects, and oil-in is connected with system hydraulic oil, and when the valve element is moved to the left, the pressure increase of the hydraulic oil of oil-out
So that the pressure increase of the hydraulic oil in the second right chamber room；When the valve element moves right, the hydraulic oil of oil-out
Pressure reduces so that the pressure of hydraulic oil in the second right chamber room reduces.
Preferably, the electrohydraulic controlling mechanism also includes：
The relative electric magnet pair of homopolarity, which is arranged in the second left chamber room, and the electric magnet is to by changing thereon
Electric current is changing the electromagnetic push to second servo piston.
Compared with prior art, the beneficial effect of the electrohydraulic controlling mechanism provided by embodiments of the invention is：The present invention
Due to being provided with fixed pressure reducing valve so that system pressure establishes servo relation with plunger variable pump, so that plunger variable energy
It is enough to be adjusted according to column system pressure.
Description of the drawings
Fig. 1 is the structural representation of the electrohydraulic controlling mechanism of the present invention.
Specific embodiment
For making those skilled in the art be better understood from technical scheme, below in conjunction with the accompanying drawings and specific embodiment party
Formula elaborates to the present invention.
Electrohydraulic controlling mechanism purpose of the invention, technical scheme and advantage, are introducing electricity of the invention for convenience of explanation
Before liquid controlling organization, it is changing discharge capacity and this kind of variable pump in introducing prior art first by which kind of mode
The main Ying Yu of mode is in which kind of situation.
Variable pump of the prior art, particularly plunger variable pump 50 change change generally by the gradient of change swash plate 51
The discharge capacity of amount pump, before variable pump is accessed hydraulic system as power source, needs the flow according to hydraulic system to hydraulic oil
Require, system pressure requirements and operating pressure require to be adjusted the discharge capacity of variable pump, that is to say, that to 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, so that variable pump accesses system
After system, the pressure remained steady of hydraulic system.
Under normal circumstances, the flow of the discharge capacity of variable pump and hydraulic system, system pressure and operating pressure are positive correlation
, that is to say, that in same hydraulic system, the discharge capacity of variable pump is bigger, the flow of hydraulic system, system pressure and work
Pressure is also bigger, otherwise less.After the discharge capacity of variable pump determines, the flow of hydraulic system, system pressure and work pressure
Power substantially can determine within the specific limits.However, flow of the discharge capacity of variable pump not with same hydraulic system, system pressure with
And operating pressure completely corresponding relation, for example, when the discharge capacity of variable pump is Xv/s, system pressure not with the discharge capacity
Unique corresponding one determines pressure, and system pressure now may fluctuate in interior change or title in a big way, and this fluctuation
May beyond system pressure allow scope, e.g., beyond system rated pressure (under the rated pressure, each unit of system
Device ability normal work).So that the discharge capacity of variable pump is incomplete with the flow of hydraulic system, system pressure and operating pressure
A corresponding critically important reason is：In system, each Hydraulic Elements draining, oil leak, and Hydraulic Elements are produced not to hydraulic oil
The change of evitable resistance and Hydraulic Elements it is aging etc..
And it is one by one to be all built upon the discharge capacity of variable pump and system parameters in prior art to the regulation of hydraulic system
What the situation of corresponding relation was carried out, for example, it is intended to for system pressure to be adjusted to a certain pressure value, only need to be by the swash plate 51 of variable pump
Pitch adjustment is to a certain discharge capacity with the unique corresponding variable pump of the pressure value.That is, only needing swash plate 51 individually
It is adjusted to a certain predetermined slant.
For example, the gradient of swash plate 51 is provided by the servo piston regulation of connecting rod, and specifically, servo piston is arranged on to be watched
Take in plunger shaft, connecting rod stretches out and pass through flexible change 51 gradient of swash plate from the one end in servo piston chamber, and servo piston chamber has
The within the chamber of connecting rod is provided with spring, draws hydraulic oil all the way from the oil-out of plunger variable pump 50 and is passed through the chamber that do not have piston rod
In room, the stroke of connecting rod is changed by the hydraulic fluid pressure size, so as to change the gradient of swash plate 51, and then change plunger
The discharge capacity of variable pump 50.
Again for example, on the one hand, obtain the gradient of the swash plate 51 of variable pump by angular transducer, the angular transducer will be oblique
Degree signal transmission to electromagnetic controller, in electromagnetic controller with the one-to-one signal of telecommunication of gradient；On the other hand, system
Hydraulic pressure oil two-way is respectively enterd in two chambers split by piston, and the connecting rod on the piston is by moving for changing with piston
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, so as to change
Become the displacement of piston, and then change the discharge capacity of variable pump.
Above two method is built upon situation of the discharge capacity of variable pump with system parameters for one-to-one relationship and enters
It is capable, however, from the foregoing, the discharge capacity of variable pump is completely corresponding because many factors are not constituted with system parameters closes
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 system 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 merely piston transverse shifting
Power, and be not associated with the discharge capacity of variable pump.Whole regulation process is relied on controller completely and feeds back to controller
The gradient of swash plate 51 carry out, not according to hydraulic system pressure real-time regulation, mutually isolate with hydraulic system.
One of above-mentioned control method the drawbacks of bigger is：Due to variable pump life-time service, a certain gradient of its swash plate 51
Corresponding discharge capacity can change, so that the numerical value of controller memory storage produces deviation with the discharge capacity of variable pump, so that：
When controller sends a swash plate 51 to be adjusted to a certain gradient and make variable pump be adjusted to the instruction of corresponding discharge capacity, on variable pump
Although swash plate 51 be adjusted to 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 of regulated variable pump not enough or does not reach tune
Saving the reason for being expected is：The discharge capacity of variable pump is not adjusted according to system pressure, and simply simple regulated variable
The discharge capacity of pump.The electrohydraulic controlling mechanism purpose of the present invention is to set up the relation of the pressure with the discharge capacity of variable pump of hydraulic system, i.e.,
Foundation adjusts the discharge capacity of variable pump to be carried out according to system pressure, and can affect system pressure again after the discharge capacity of variable pump is adjusted
Servo relation.
As shown in figure 1, embodiment of the invention discloses that a kind of electrohydraulic controlling mechanism, for by changing plunger variable pump
Adjusting the pressure of hydraulic system, the electrohydraulic controlling mechanism is specifically included 50 discharge capacity：First servo unit 10 and definite value decompression
Valve 40.
First servo unit 10 includes being formed with the first housing of 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 room 12；Be provided with first left chamber 11 for
The first spring 15 of the first servo piston 13 is pushed against, wherein,
The action of the first servo piston 13 is configured to following interaction relation with the gradient of the swash plate 51 of plunger variable pump 50：
When the first servo piston 13 is moved to the left, the first servo piston 13 causes 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 causes the oblique of the swash plate 51 of plunger variable pump 50
Degree increase；Wherein：
System hydraulic oil is divided into two-way and each leads into the first left chamber 11 and the first right chamber room 12, and fixed pressure reducing valve 40 is arranged
Being passed through on the pipeline of the first left chamber 11, so that the pressure of the hydraulic oil in the first left chamber 11 keeps constant, so that first
Pressure of the difference of the pressure of the hydraulic oil in the pressure of the hydraulic oil in right chamber room 12 and the first left chamber 11 with system hydraulic oil
The increase of power and increase.
Thus, when system pressure increase (because of some reasons, the discharge capacity increase, control element including plunger variable pump 50
Hydraulic fluid port diminishes) when, the pressure increase of the hydraulic oil in the first right chamber room 12, and the pressure of the hydraulic oil in the first left chamber 11
Because receiving 40 control pressure of fixed pressure reducing valve constant, so that the first servo piston 13 is moved to the left, the first servo piston 13
The gradient of the mobile swash plate 51 for causing plunger variable pump 50 reduces；So as to 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
Obtain the gradient increase of the swash plate 51 of plunger variable pump 50；When system pressure reduces (because of some reasons, including plunger variable pump 50
Discharge capacity reduces, the hydraulic fluid port of control element becomes big etc.) when, the pressure of the hydraulic oil in the first right chamber room 12 reduces, and the first left chamber
The pressure of the hydraulic oil in room 11 because by 40 control pressure of fixed pressure reducing valve it is constant so that the first servo piston 13 moves right
Dynamic, the movement of the first servo piston 13 causes the gradient of the swash plate 51 of plunger variable pump 50 to increase, so as to plunger variable pump 50
Discharge capacity increases, and the discharge capacity of plunger variable pump 50 increases the system pressure that post-compensation declines.
The electrohydraulic controlling mechanism of the present invention establishes the relation between 50 discharge capacity of system pressure and plunger variable pump so that be
System pressure is only adjusted by the change of the discharge capacity of plunger variable pump 50, adjusts other for affecting system pressure so as to eliminate
The process of Hydraulic Elements, so that the process of regulation is simple and accurate.The process can simply accurate adjustment system pressure the reason for
It is：Although affecting the factor of system pressure a lot, system pressure can be carried out by changing the discharge capacity of plunger variable pump 50
Change and adjust.
Relation between 50 discharge capacity of system pressure and plunger variable pump set up by the electrohydraulic controlling mechanism of the present invention is to watch
Take relation, that is to say, that system pressure can produce pressure signal in real time, and the pressure signal is direct or is converted into mechanical signal
Plunger variable pump 50 is passed to so that 50 discharge capacity of plunger variable pump changes, and 50 discharge capacity of plunger variable pump change being capable of shadow in real time
Acoustic system pressure, so that system pressure reaches a numerical value that is constant and meeting system requirements.
The electrohydraulic controlling mechanism of the present invention changes the discharge capacity of plunger variable pump 50 according to system pressure, so that after adjusting
System pressure more conform to pre-provisioning request.
The electrohydraulic controlling mechanism of the present invention according to the discharge capacity of system pressure pilot plunger variable pump 50, and can set up system
Pressure is it is critical only that with the servo relation of plunger variable pump 50：On the system pipeline for leading to the first left chamber 11, definite value is set
Air relief valve 40, the fixed pressure reducing valve 40 cause the pressure of the hydraulic oil in the first left chamber 11 to be less than system pressure and for not with being
System pressure change and the definite value that changes, and the pressure of the hydraulic oil in the first right chamber room 12 is equal to system pressure, so that the
The pressure initiation of the hydraulic oil in the pressure of the hydraulic oil in one right chamber room 12 and the first left chamber 11 pressure differential, in pre- level pressure
Power is poor, and (predetermined pressure difference is referred to：In system pressure required for hydraulic system, i.e. rated pressure, with the first left chamber 11
The difference of the pressure of hydraulic oil) under, the predetermined pressure difference is offset by the first spring 15, now, the first servo piston 13 keeps
It is motionless, and when system pressure is above or below rated pressure, now, the first servo piston 13 occurs in the presence of pressure differential
It is mobile, so that there is gradient change by the movement of the first servo piston 13 in swash plate 51, so as to change plunger variable pump
50 discharge capacity, and the change of this discharge capacity can be made up just or the change of bucking-out system pressure, for example, when system pressure increases
When, the first servo piston 13 causes 50 discharge capacity of plunger variable pump to reduce, and when system pressure reduces, the first servo piston 13 is caused
50 discharge capacity of plunger variable pump increases.
The fixed pressure reducing valve 40 of the electrohydraulic controlling mechanism of the present invention is the decisive element for producing pressure differential, and makes system pressure
Power generates pressure differential with 13 two ends of condition exactly the first servo piston under the decision of the generation servo relation of plunger variable pump 50.
The fixed pressure reducing valve 40 of the electrohydraulic controlling mechanism of the present invention also determines the rated pressure of system, that is to say, that
On the premise of the coefficient of elasticity of the first spring 15 is certain, when fixed pressure reducing valve 40 sets predetermined value, system pressure is also determined that
, reason is：When fixed pressure reducing valve 40 sets predetermined value as A, now, system pressure should equal to predetermined value be A pair
Hydraulic fluid pressure (pressure of the hydraulic oil in the first left chamber 11) FA for answering and the thrust FB sum of the first spring 15, otherwise
One servo piston 13 can be moved.That is, after 40 setting value of fixed pressure reducing valve determines, system pressure can produce one
Pressure value corresponding with setting value, conversely, can make system pressure satisfactory by adjusting 40 setting value of fixed pressure reducing valve
Pressure value.Therefore, the fixed pressure reducing valve 40 of electrohydraulic controlling mechanism of the invention is also equipped with the function of regulating system rated pressure.
The electrohydraulic controlling mechanism of the present invention is due to being provided with fixed pressure reducing valve 40 such that it is able to according to system pressure it is accurate and
By the discharge capacity of adjustment plunger variable pump 50 repeatedly, so that the system pressure volume for being adjusted to require fast and accurately
Constant-pressure, maintains the constant pressure of system pressure so as to alleviate overflow valve, improves the shelf life of overflow valve.
The interaction relation above-mentioned for realizing the gradient of the action 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 causes the gradient of the swash plate 51 of plunger variable pump 50 to subtract
It is little；When the first servo piston 13 moves right, the first servo piston 13 causes the gradient of the swash plate 51 of plunger variable pump 50 to increase
Greatly；
The electrohydraulic controlling mechanism of the present invention also includes the second servo unit 20 and control unit 30, on the first servo piston 13
It is provided with the first push rod 14；
Second servo unit 20 includes being formed with the second housing of 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 left chamber 21 and is arranged on 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 connected 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 increase of swash plate 51；
Control unit 30 includes the valve body for being formed with valve pocket and the valve element 31 being arranged in valve pocket, and valve element 31 is pushed away by first
Bar 14 drives, and system hydraulic oil passes through control unit 30 to 21 fuel feeding of the second left 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 left chamber 21 with movable valve plug 31
The pressure increase of force feed；When the first push rod 14 moves right, the first push rod 14 is moved with movable valve plug 31 so that the second left chamber
The pressure of the hydraulic oil in 21 reduces.
Thus, when system hydraulic pressure increases, the first push rod 14 is moved to the left, the second push rod 24 is caused 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 system hydraulic pressure reduces,
First push rod 14 moves right, and second push rod 24 is also moved right by control unit 30, so that swash plate 51 is oblique
Degree increase, the discharge capacity increase of plunger variable pump 50.
In a preferred embodiment of the invention, control unit 30 be proportional reversing valve, the oil-out of proportional reversing valve
Connect with the second left chamber 21, oil-in is connected with system hydraulic oil, and when valve element 31 is moved to the left, the hydraulic oil of oil-out
Pressure increase so that the pressure increase of hydraulic oil in the second left chamber 21；When valve element 31 moves right, the liquid of oil-out
The pressure of force feed reduces so that the pressure of hydraulic oil in the second left chamber 21 reduces.
In a preferred embodiment of the invention, electrohydraulic controlling mechanism also includes the relative electric magnet 26 pairs of homopolarity, should
Electric magnet to being arranged in the second left chamber 21, electric magnet 26 pairs by change thereon electric current to change to the second servo piston 23
Electromagnetic push, the electric magnet to 26 by changing electromagnetic push changing the pretightning force of second spring 25 so that second
Servo piston 23 changes per the hydraulic pressure increase and decrease amount required for Moving Unit displacement, if thus, magnetic of the Magnet to 26
When repulsion increases, the pretightning force of second spring 25 reduces, and then makes the liquid required for the 23 Moving Unit displacement of the second servo piston
The increase and decrease amount of pressure pressure reduces, and often increases and decreases unit hydraulic pressure in other words, and the displacement of the movement of the second servo piston 23 is bigger, so as to
So that the second servo piston 23 changes more sensitive to hydraulic pressure, so as to directly enhance the discharge capacity of pilot plunger variable pump 50
Sensitivity；If the Magnet reduces to 26 magnetic repulsion, the pretightning force increase of second spring 25, and then make the second servo piston
The increase and decrease amount increase of the hydraulic pressure required for 23 Moving Unit displacements, often increases and decreases unit hydraulic pressure, the second servo in other words
The displacement of the movement of piston 23 is less, even if so that when the second servo piston 23 changes in the larger pressure limit, the second servo
Piston 23 can also in the forming range the direct discharge capacity of pilot plunger variable pump 50, so as to increased the regulation of system pressure
Scope.
Above example is only the exemplary embodiment of the present invention, is not used in the restriction present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can be made respectively to the present invention in the essence and protection domain of the present invention
Modification or equivalent is planted, this modification or equivalent also should be regarded as being within the scope of the present invention.
Claims (4)
1. a kind of electrohydraulic controlling mechanism, adjusts the pressure of hydraulic system for by the discharge capacity of change plunger variable pump, and which is special
Levy and be, including：
First servo unit, which includes being formed with the first housing of first chamber, is 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 room；Be provided with the first left chamber room for
The first spring of first servo piston is pushed against, wherein,
The action of first servo piston is configured to following interaction relation with the gradient of the swash plate of the plunger variable pump：
When first servo piston is moved to the left, first servo piston causes the oblique of the swash plate of the plunger variable pump
Degree reduces；When first servo piston moves right, first servo piston causes the swash plate of the plunger variable pump
Gradient increase；Wherein：
The electrohydraulic controlling mechanism also includes
Fixed pressure reducing valve, system hydraulic oil are divided into two-way and each lead into first left chamber and the first right chamber room, described
Fixed pressure reducing valve is arranged on and is passed through on the pipeline of first left chamber, so that the pressure of the hydraulic oil in the first left chamber room
Keep constant, so that the pressure of the hydraulic oil in the pressure of the hydraulic oil in the first right chamber room and the first left chamber room
Difference increases with the increase of the pressure of system hydraulic oil.
2. electrohydraulic controlling mechanism according to claim 1, it is characterised in that also single including the second servo unit and control
Unit, is provided with the first push rod on first servo piston；
Second servo unit includes being formed with the second housing of second chamber, is arranged in the second chamber, and by institute
State second chamber to be divided into the second servo piston of the second left chamber and the second right chamber room and be arranged on the second servo work
The second push rod beyond the Great Wall, is provided with second spring in the second left chamber room, second push rod is connected 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 increase of the swash plate；
Described control unit includes the valve body for being formed with valve pocket and the valve element being arranged in the valve pocket, and the valve element is by described
First push rod drives, and system hydraulic oil passes through described control unit to the second right chamber room fuel feeding, so that：
When first push rod is moved to the left, first push rod drives the valve element to move so that in the second right chamber room
Hydraulic oil pressure increase；When first push rod moves right, first push rod drive the valve element movement so that
The pressure of the hydraulic oil in the second right chamber room reduces.
3. electrohydraulic controlling mechanism according to claim 2, it is characterised in that described control unit is proportional reversing valve, institute
The oil-out and the described second right chamber of proportional reversing valve is stated, oil-in is connected with system hydraulic oil, and work as the valve element
When being moved to the left, the increase of the pressure of the hydraulic oil of oil-out is so that the pressure increase of hydraulic oil in the second right chamber room；When
When the valve element moves right, the pressure of the hydraulic oil of oil-out reduces the pressure so that hydraulic oil in the second right chamber room
Reduce.
4. electrohydraulic controlling mechanism according to claim 3, it is characterised in that the electrohydraulic controlling mechanism also includes：
The relative electric magnet pair of homopolarity, which is arranged in the second left chamber room, and the electric magnet is to by changing electric current thereon
To change the electromagnetic push to second servo piston.
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| CN201611035936.3A CN106523457B (en) | 2016-11-22 | 2016-11-22 | Electrohydraulic controlling mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112097740A (en) * | 2020-09-15 | 2020-12-18 | 山东工业职业学院 | Walking type automatic leveling surveying instrument |
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|---|---|
| CN106523457B (en) | 2019-05-10 |
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Effective date of registration: 20190221 Address after: 225000 Donghui Town, Fanchuan Town, Jiangdu District, Yangzhou City, Jiangsu Province Applicant after: Tian Jia smart equipment manufacturing Jiangsu Limited by Share 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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