CN104514763B - Improved servo control valve and control method thereof - Google Patents
Improved servo control valve and control method thereof Download PDFInfo
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- CN104514763B CN104514763B CN201410848983.4A CN201410848983A CN104514763B CN 104514763 B CN104514763 B CN 104514763B CN 201410848983 A CN201410848983 A CN 201410848983A CN 104514763 B CN104514763 B CN 104514763B
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- 238000000034 method Methods 0.000 title claims description 8
- 238000007789 sealing Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 10
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 7
- 210000004907 gland Anatomy 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 4
- 230000001186 cumulative effect Effects 0.000 claims 1
- 230000009977 dual effect Effects 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
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- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Servomotors (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to an improved servo control valve. The servo control valve comprises a valve body, wherein a valve sleeve and a valve core are arranged on the valve body, and the valve core and the valve sleeve are mounted and arranged in a misplacement manner; an inner hole of a valve seat is mounted on the valve core in a sleeving manner, and an excircle at the lower part is mounted in a mounting hole of the valve sleeve; a pull rod is mounted on the excircle of the valve core in a sleeving manner, a spacing pin is mounted in a positioning pin hole formed in the valve core in a transitional manner, one end of the spacing pin is sunk in the valve core, and the other end of the spacing pin is protruded outside the excircle of the valve core and is inserted in a spacing groove formed in the valve seat; an adjusting screw is combined with the valve body in a screwed manner, and the middle part of a feedback rod is mounted in the adjusting screw in a sleeving manner; a ball head at the left end of the feedback rod is fit with a radial hole formed in the valve sleeve, and a ball head at the right end is mounted in a feedback groove of a servo cylinder; a reset spring seat is mounted in the valve body; in addition, an oil path in the valve body is divided into three parts of oil feeding, oil controlling and oil returning, which are mutually communicated. According to the invention, the valve core is controlled to rotate in different directions, so that the purpose that the servo cylinder operates in different directions is realized, and swash plates oblique by corresponding angles; therefore, the purpose of oil pumping in dual directions is realized, and the output discharge capacity of a pump is changed.
Description
Technical field
The present invention relates to servo variable mechanism technical field, more particularly, to a kind of modified model pilot valve and its controlling party
Method.
Background technology
Pilot valve is all integrated on valve body as the core control element of servosystem, miscellaneous part, valve body
Performance directly affects the precision and stability of whole control system, by being installed on valve body on the pump housing, by control pressure oil
And then control hydraulic pump discharge.Valve element and valve pocket are set in valve body, the connection of oil circuit control, thus by control pressure oil warp
It is delivered to the operation of variable oil cylinder control cylinder after pilot valve and fixed point stops, playing the effect controlling hydraulic pump discharge.
It is not provided with positioner on the valve element using at present, leads to valve element its angle in rotary course uncontrolled, lead to part to become
The damage of amount components and parts, and then affect the discharge capacity of pump, causes whole pump out of control, and pull bar be arranged on valve element cylindrical on, in outside behaviour
When pulling pull bar drives Spool rotating under vertical device effect, easily cause the relative slip of pull bar and valve element, remote-effects oil cylinder
Fixed point stop position, after reset, servosystem can not accurately be in zero-bit state；The control end that valve pocket is arranged with valve element simultaneously is not
Rationally, lead to hydraulic system can not realize servoBcylinder along different directions operation by manipulating valve element, and then drive hydraulic pump swash plate
Do different directions, realize two-way pump oil, and pump output discharge capacity can not change in real time.
Content of the invention
Technical problem solved by the invention is to provide a kind of modified model pilot valve and its control method, to solve
Shortcoming in above-mentioned background technology.
Technical problem solved by the invention employs the following technical solutions to realize:
Modified model pilot valve, including valve body, wherein, valve body is provided with valve pocket installing hole for installing valve pocket and
Valve element for installing valve element installs bottom outlet, and valve element is installed on valve element through valve pocket bottom and installs in bottom outlet, in arranged in dislocation
Arrangement；For preventing sealing from producing air pressure, in valve element, bottom outlet sidepiece is installed and offers balance pressure channel, to balance inside and outside die cavity
Pressure；Valve seat endoporus is set on valve element, and the cylindrical valve pocket that is installed in its underpart installs in the hole, the sealing when loading valve pocket installing hole
Pressure passes through to balance pressure channel unloading；Pull bar be set in valve element cylindrical on, spacer pin transition is installed on valve element determining of setting
Position pin-and-hole in, its one end is sunken in valve element, the other end protrude from valve element cylindrical and insert valve seat on setting stopper slot in, work as valve
During core rotation, move in the stopper slot of valve seat with spacer pin, when moving to spacing groove edge, spacer pin is restricted,
Thus limiting the anglec of rotation of valve element；Adjusting screw passes through the adjustment of the outside adjusting screw external screw thread arranging and setting on valve body
Screw is installed female thread and is screwed, and is set on the eccentric adjustment circle of adjusting screw in the middle part of feedback rod, and its left end bulb and valve pocket
The radial hole cooperation of upper setting, right-hand member bulb is installed in the feedback groove of servoBcylinder, by rotating adjusting screw, drives eccentric tune
Full circle swings, thus adjusting the relative position of feedback rod, allows servosystem be in zero-bit state；Return spring holder is installed on valve
In vivo, the plug screw for sealing blocking and is provided with return spring holder；Additionally, in valve body oil circuit be divided into oil-feed, oil-control and
Three parts of oil return, oil-feed part is provided with the first oil inlet passage, the second oil inlet passage, the 3rd oil inlet passage and the 4th oil-feed and leads to
Road, oil controlling portion set up separately be equipped with first left side oil-control passage, second left side control passage, first right side oil-control passage and second right side control
Oily passage, oil return part is provided with drainback passage, and oil-feed, three parts of oil-control and oil return connect each other；And in valve element revolution
Centrage is symmetrical to have left side V-shaped groove and right side V-shaped groove.
In the present invention, pull bar by trip bolt lock onto valve element cylindrical on, coupling mechanism force can effectively ensure that external control
Device drives Spool rotating when pulling pull bar, and does not cause the relative slip of pull bar and valve element.
In the present invention, adjusting screw is provided with top positioning cylindrical cylindrical with bottom positioning, and top positioning is cylindrical
With the adjusting screw top location hole cooperation of setting on valve body, it is fixed that bottom positions the cylindrical adjusting screw bottom with setting on valve body
The cooperation of position hole.
In the present invention, adjusting screw is provided with secure gland nut, by screw secure gland nut fasten close
Envelope.
In the present invention, on secure gland nut and valve body setting counterbore seal groove secured fit.
In the present invention, it is provided with precompressed back-moving spring between plug screw and return spring holder.
In the present invention, the front end of return spring holder is inserted in the reset seat breach of setting on valve element.
In the present invention, the angle rotatable of valve element is 3 °～35 °.
In the present invention, valve pocket is symmetrically set with left oil canal and right oil canal with regard to the valve pocket centre of gyration, uses
Input and off-load in pressure oil.
In the present invention, the control oil inlet passage of valve element and valve pocket composition is provided with input and outfan, external pressure
Oil flows into servo variable displacement cylinder through input, through outfan oil return unloading.
Modified model pilot valve control method, specifically comprises the following steps that
Pressure oil is delivered to valve element and the control oil inlet passage input end of valve pocket composition, oil-control part one through oil-feed part
Road is delivered on the left of servo variable displacement cylinder through right oil canal, the second left side oil-control passage and the first right side oil-control passage, another road warp
Left oil canal, the second right side oil-control passage and the first left side oil-control passage are delivered on the right side of servo variable displacement cylinder, and work as oil-control part
During one road input pressure oil, another Lu Zewei oil return, and finally through outfan and drainback passage oil return unloading；When servo valve is no outer
When portion manipulates, valve element is in relative normally off with valve pocket under return spring holder effect；When pull bar is along rotate counterclockwise, valve
Core and valve pocket are in staggered positions, connect oil circuit, and left passage walked by pressure oil, promote servoBcylinder right lateral, now on the right side of servoBcylinder
Oil returns through right wing and is discharged by outfan and drainback passage off-load, and servoBcylinder drives feedback rod to revolve around adjusting screw simultaneously
Turn, feedback rod is stirred valve pocket and done rotate counterclockwise around valve element, promote the oil circuit connected to trend towards closing, servoBcylinder rests on works as
Front position, whole hydraulic system is in dynamic balance state；Equally, when pull bar rotates clockwise, valve element and valve pocket are in mistake
Open position, connects oil circuit, and right wing passage walked by pressure oil, promotes servoBcylinder left lateral, and now the oil on the left of servoBcylinder returns through left
And discharged by outfan and drainback passage off-load, servoBcylinder drives feedback rod to rotate around adjusting screw simultaneously, and feedback rod is stirred
Valve pocket turns clockwise around valve element, promotes the oil circuit connected to trend towards closing, servoBcylinder rests on current location, whole liquid
Pressure system is in dynamic balance state；Rotated along different directions by manipulating valve element, run along different directions with realizing servoBcylinder,
And then drive hydraulic pump swash plate to do different directions, thus realizing two-way pump oil, and the angle with Spool rotating is different, watches
The operation stop position taking cylinder is also different, and the corresponding angle of inclination of swash plate also changes therewith, thus realizing pump to export changing of discharge capacity
Become.
Valve element is stepless regulated, and to realize the stepless change output of pumpage, valve element angle rotatable is 3 °～35 °, real
Border leads to oil and promotes servoBcylinder operation angle to be 3 °～35 °, and the motion mode that hydraulic system is in dynamic balance state is as follows:
When valve element no external control, the distance between top of left side V-shaped groove and right side V-shaped groove is arranged more than on valve pocket
Input passage diameter dimension, therefore oil circuit is separated, and is in normally off, and input pressure oil unloads through system overflow valve
Lotus；On valve pocket, the outfan channel diameter size of setting is more than input channel diameter size, and left side V-shaped groove and right side V-shaped
The distance between top of groove is less than the diameter dimension of the outfan passage of setting on valve pocket, and that is, right oil canal passes through right side V-shaped
Groove, left oil canal are in normally open by left side V-shaped groove and outfan, when valve element starts dextrorotation from reset state
Turn, and when the anglec of rotation is less than 3 °, left side V-shaped groove and input are from off state to progressively opening, and left side V-shaped groove now
To be gradually reduced with the aperture of outfan, right side V-shaped groove and input are in still closed mode, right side V-shaped groove and outfan
Aperture will be gradually increased, when left side V-shaped groove and input aperture are less than the aperture of left side V-shaped groove and outfan, input stream
Through the oil to left oil canal directly through outfan off-load, now it is not enough to set up pressure in left oil canal, servoBcylinder is in pretension bullet
It is in zero-bit state, swash plate no tilts, the discharge capacity of pump is zero in the presence of spring force；When valve element progressively rotates, promote left side V-shaped groove
Be more than with the aperture of input left side V-shaped groove and outfan aperture when, now set up pressure in left oil canal, and in left logical oil
When active force on servoBcylinder for the action of hydraulic force that road is set up is more than preloading spring power, servoBcylinder will be run by promotion, and
This builds the critical anglec of rotation of valve element during pressure and is 3 °, and left side V-shaped groove had both been connected with input and connected with outfan, and input pumps into
Pressure oil part be used for making up servo cylinder system leakage, partly through outfan off-load；When Spool rotating crosses β ° (3 ° < β < 35 °)
When, on the left of now moment, V-shaped groove is only connected with left oil canal, and left oil canal builds rapidly pressure, and servoBcylinder is promoted, and meanwhile watches
Taking cylinder drives feedback rod to stir valve pocket and turn clockwise, and progressively promotes left side V-shaped groove and the aperture of input to reduce, promotees simultaneously
Left side V-shaped groove is made to be gradually increased with the aperture of outfan, the pressure oil that can pass through when left side V-shaped groove and input aperture is just
When making up system leak and outfan off-load, servoBcylinder is out of service, and servo feedback system is now in hydraulic pressure dynamic equilibrium shape
State；It is delivered to the fixed point stop position of variable oil cylinder control cylinder by control pressure oil after pilot valve, to realize controlling
Hydraulic pump discharge processed.
Beneficial effect: in the present invention, valve element is installed on valve element through valve pocket bottom and installs in bottom outlet, arranges in arranged in dislocation,
Pull bar by trip bolt lock onto valve element cylindrical on, by rotating rod, connect oil circuit, manipulate valve element and revolve along different directions
Turn, run along different directions with realizing servoBcylinder, and then drive hydraulic pump swash plate to do different directions, thus realizing two-way pump
Oil, and the angle with Spool rotating is different, the operation stop position of servoBcylinder is also different, the corresponding angle of inclination of swash plate also with
Change, thus realizing the change of the output discharge capacity of pump, being delivered to change gauging after pilot valve to realize control pressure oil
The fixed point stop position of cylinder control cylinder, and then control pumpage, control accuracy is high；And be provided with valve element in dowel hole,
Spacer pin one end is sunken in valve element, the other end protrude from valve element cylindrical and insert valve seat on setting stopper slot in, thus limiting
The anglec of rotation of valve element, the limit discharge capacity of controlling pump.
Brief description
Fig. 1 is the assembling front view of presently preferred embodiments of the present invention.
Fig. 2 is the assembling plan view of presently preferred embodiments of the present invention.
Fig. 3 is the assembling right view of presently preferred embodiments of the present invention.
Fig. 4 is the valve body main sectional view in presently preferred embodiments of the present invention.
Fig. 5 is that the valve pocket installing hole in Fig. 4 installs bottom outlet sectional view with valve element.
Fig. 6 is the adjusting screw front view in presently preferred embodiments of the present invention.
Fig. 7 is the valve element front view in presently preferred embodiments of the present invention.
Fig. 8 is the principle schematic of presently preferred embodiments of the present invention.
Fig. 9～Figure 12 is that the servo feedback system in presently preferred embodiments of the present invention is in hydraulic pressure dynamic equilibrium time sequence status
Figure.
Figure 13 is Spool rotating angle and pumpage relation schematic diagram in presently preferred embodiments of the present invention.
Specific embodiment
In order that technological means, creation characteristic, reached purpose and effect that the present invention realizes are easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is expanded on further.
Referring to the modified model pilot valve of Fig. 1～Fig. 7, including pull bar 1, valve seat 2, o type sealing ring 1, spacer pin 4, o
Type sealing ring 25, trip bolt 1, secure gland nut 7, adjusting screw 8, throttling pad 9, o type sealing ring 3 10, feedback
Bar 11, o type sealing ring 4 12, o type sealing ring 5 13, o type sealing ring 6 14, o type sealing ring 7 15, valve body 16, valve element 17, close
Envelope screw plug 18, valve pocket 19, plug screw 20, return spring holder 21, back-moving spring 22, o type sealing ring 8 23, trip bolt 2 24；And
Adjusting screw 8 includes adjusting screw external screw thread 8-1, top positions cylindrical 8-2, eccentric adjustment circle 8-3, the bottom cylindrical 8-4 of positioning；
Valve body 16 includes trip bolt hole 16-1, the first left side oil-control passage 16-2, the first right side oil-control passage 16-3, drainback passage
16-4, balance pressure channel 16-5, the first oil inlet passage 16-6, feedback rod swing breach 16-8, valve pocket installing hole 16-9, second
Oil inlet passage 16-10, the 3rd oil inlet passage 16-11, valve element install bottom outlet 16-12, the 4th oil inlet passage 16-13, adjusting screw
Bottom location hole 16-14, adjusting screw top location hole 16-15, adjusting screw install female thread 16-16, counterbore seal groove
16-17, the second left side oil-control passage 16-18, the second right side oil-control passage 16-19；Valve element 17 includes dowel hole 17-1, left side
V-shaped groove 17-2, the cylindrical 17-3 of valve element, right side V-shaped groove 17-4, reset seat breach 17-5, input p, outfan t, right oil canal a
And left oil canal b.
In the present embodiment, all o type circles being installed on valve body are used to leak-tight seal use, and valve pocket 19 is installed on valve
In the valve pocket installing hole 16-9 of setting on body 16, the valve element that valve element 17 is installed on setting on valve body 16 through valve pocket 19 bottom is installed
In bottom outlet 16-12, valve seat 2 endoporus is set on valve element 17, and bottom is cylindrical is installed in valve pocket installing hole 16-9, is loading valve
During set installing hole 16-9, seal pressure is passed through to balance pressure channel 16-5 unloading, and all cooperations are gap cooperation, and valve seat 2 leads to
Cross trip bolt 2 24 to be fastened on valve body 16；Pull bar 1 is set on the cylindrical 17-3 of valve element, and passes through trip bolt 1
Locking, coupling mechanism force can effectively ensure that external control device band movable valve plug 17 when pulling pull bar 1 rotates, and do not cause pull bar 1 with
The relative slip of valve element 17, spacer pin 4 transition is installed in the dowel hole 17-1 of setting on valve element 17, and one end is sunken to valve element 17
Interior, the other end protrude from valve element 17 cylindrical and insert valve seat 2 stopper slot in, when valve element 17 rotates, with spacer pin 4 in valve
Move in the stopper slot of seat 2, when moving to spacing groove edge, spacer pin 4 is restricted, thus limiting the anglec of rotation of valve element 17
Degree；
Adjusting screw 8 is passed through the outside adjusting screw external screw thread 8-1 arranging and is installed with the adjusting screw of setting on valve body 16
Female thread 16-16 screws, and top positions cylindrical 8-2 and adjusting screw top location hole 16-15 and coordinates, and bottom positions cylindrical 8-
4 are coordinated with adjusting screw bottom location hole 16-14, and are fastened close by the secure gland nut 7 screwing in adjusting screw 8
Envelope, now secure gland nut 7 and counterbore seal groove 16-17 secured fit, it is set in eccentric adjustment circle in the middle part of feedback rod 11
On 8-3, left end bulb is coordinated with the radial hole of setting on valve pocket 19, and the right-hand member bulb on feedback rod 11 is installed on the anti-of servoBcylinder
In feedback groove, by rotating adjusting screw 8, eccentric adjustment circle 8-3 is driven to swing, thus adjusting the relative position of feedback rod 11,
Servosystem is allowed to be in zero-bit state；Return spring holder 21 is installed in valve body 16, and by plug screw 20 sealing blocking, and in spiral shell
It is provided with precompressed back-moving spring 22, the reset of valve element 17 is inserted in the front end of return spring holder 21 between plug 20 and return spring holder 21
In seat breach 17-5；Sealing screw plug 18 is used for blocking technique runner hole.
Shown in Figure 8, oil circuit is divided into oil-feed, oil-control and three parts of oil return, and oil-feed part is through the 4th oil inlet passage 16-
13rd, at the input p of the first oil inlet passage 16-6, the 3rd oil inlet passage 16-11 and the second oil inlet passage 16-10 valve pocket, oil-control
Part one tunnel is delivered to servo variable displacement through right oil canal a, the second left side oil-control passage 16-18 and the first right side oil-control passage 16-3
On the left of cylinder, another road is delivered to and watches through left oil canal b, the second right side oil-control passage 16-19 and the first left side oil-control passage 16-2
Take on the right side of variable cylinder, and when oil-control part one road input pressure oil, another road then becomes oil return part around, and final warp
Outfan t and drainback passage 16-4 oil return unloading；When servo valve no external control, valve element 17 is under return spring holder 21 effect
It is in relative normally off with valve pocket 19, as shown in Fig. 2 when pull bar 1 is along rotate counterclockwise, valve element 17 and valve pocket 19 stagger position
Put, connect oil circuit, left passage walked by pressure oil, promote servoBcylinder right lateral, now the oil on the right side of servoBcylinder return through right wing and by
Outfan t and drainback passage 16-4 off-load are discharged, and servoBcylinder drives feedback rod 11 to rotate around adjusting screw 8 simultaneously, this
When feedback rod 11 will stir valve pocket 19 and do rotate counterclockwise around valve element 17, promote the oil circuit connected to trend towards closing, allow servo
Cylinder rests on current location, and whole hydraulic system is in dynamic balance state；Equally, when pull bar 1 rotates clockwise, valve element
17 with valve pocket 19 staggered positions, connect oil circuit, right wing passage walked by pressure oil, promote servoBcylinder left lateral, now on the left of servoBcylinder
Oil returns through left and is discharged by outfan t and drainback passage 16-4 off-load, simultaneously servoBcylinder drive feedback rod 11 around
Adjusting screw 8 rotates, and now feedback rod 11 will be stirred valve pocket 19 and turn clockwise around valve element 17, promotes the oil circuit connected to become
To in closing, allowing servoBcylinder rest on current location, whole hydraulic system is in dynamic balance state；By manipulating valve element 17 court
Different directions rotates, and realizes servoBcylinder and runs towards different directions, and then drive hydraulic pump swash plate does different directions and inclines
Tiltedly, thus realizing two-way pump oil, and the angle with valve element 17 rotation is different, and the operation stop position of servoBcylinder is also different, tiltedly
The corresponding angle of inclination of disk also and then changes, thus realizing the change of the output discharge capacity of pump.
Valve element 17 is stepless regulated, therefore realizes stepless change output, the anglec of rotation of valve element 17 and the pumpage of pumpage
Relation as shown in figure 13, the angle rotatable scope of valve element 17 is 3 °～35 °, and actual logical oil promotes servoBcylinder operation angle model
Enclose for 3 °～35 °, as shown in a, b position in Fig. 2, hydraulic system is in dynamic equilibrium shape to extreme position clockwise and anticlockwise
State sequential, as shown in figure 9, when valve element 17 no external control, due to the top of left side V-shaped groove 17-2 and right side V-shaped groove 17-4
The distance between more than the input p-channel of setting on valve pocket 19 diameter dimension, so oil circuit is separated, be in normally closed shape
State, input p pressure oil is through system overflow valve off-load；On valve pocket 19, the channel diameter size of outfan t setting is more than input p
Channel diameter size, and the distance between the top of left side V-shaped groove 17-2 and right side V-shaped groove 17-4 arranges less than on valve pocket 19
Outfan t passage diameter dimension, that is, right oil canal a by right side V-shaped groove 17-4, left oil canal b pass through left side V-shaped groove
17-2 is in normally open with outfan t respectively, as shown in Figure 10, taking 17 turn clockwise as a example, when valve element 17 is from multiple
Position state starts to turn clockwise, and when the anglec of rotation is less than 3 °, left side V-shaped groove 17-2 and input p from off state to by
Step is opened, and the aperture of left side V-shaped groove 17-2 and outfan t now will be gradually reduced, and right side V-shaped groove 17-4 now with
Input p is in still closed mode, and the aperture of right side V-shaped groove 17-4 and outfan t will be gradually increased, because of left side V-shaped groove 17-2
It is less than the aperture of left side V-shaped groove 17-2 and outfan t with input p aperture, therefore the oil that input p flows through left oil canal b is straight
Connect through outfan t off-load, be now not enough to set up pressure in left oil canal b, servoBcylinder is in the presence of preloading spring power
Zero-bit state, swash plate no tilts, and the discharge capacity of pump is zero, when valve element 17 progressively rotates, promotes left side V-shaped groove 17-2 and input p
Aperture be more than left side V-shaped groove 17-2 and outfan t aperture when, now set up pressure in left oil canal b, and in left oil canal
When active force on servoBcylinder for the action of hydraulic force that b is set up is more than preloading spring power, servoBcylinder will be run by promotion, and this
Build valve element 17 critical anglec of rotation during pressure and be 3 °, now left side V-shaped groove 17-2 had both been connected with input p and connected with outfan t,
The pressure oil part that input p pumps into is used for making up servo cylinder system leakage, partly through outfan t off-load；As shown in figure 11, when
When valve element 17 rotates through β ° (this angle is more than 3 ° and is less than 35 °), on the left of now moment, V-shaped groove 17-2 is only connect with left oil canal b
Logical, left oil canal b builds rapidly pressure, and servoBcylinder is promoted, and meanwhile servoBcylinder drives feedback rod to stir valve pocket 19 and does clockwise
Rotation, progressively promotes the aperture of left side V-shaped groove 17-2 and input p to reduce, promotes left side V-shaped groove 17-2 and outfan t simultaneously
Aperture be gradually increased, when the pressure oil that left side V-shaped groove 17-2 and input p aperture can be passed through just make up system leak and
During outfan t off-load, servoBcylinder is out of service, and as shown in figure 12, servo feedback system is now in hydraulic pressure dynamic balance state.
Ultimate principle and principal character and the advantages of the present invention of the present invention have been shown and described above.The technology of the industry
, it should be appreciated that the present invention is not restricted to the described embodiments, the simply explanation described in above-described embodiment and description is originally for personnel
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes
Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and its
Equivalent thereof.
Claims (10)
1. modified model pilot valve, installs for the valve pocket installing valve pocket it is characterised in that being provided with valve body including valve body
Hole and for install valve element valve element install bottom outlet, and valve element pass through valve pocket bottom be installed on valve element installation bottom outlet in, in dislocation
Mounting arrangements；And offering balance pressure channel in valve element installation bottom outlet sidepiece, valve seat endoporus is set on valve element, outside its underpart
Circle is installed on valve pocket and installs in the hole；Pull bar be set in valve element cylindrical on, spacer pin transition is installed on valve element the alignment pin of setting
In the hole, its one end is sunken in valve element, the other end protrude from valve element cylindrical and insert valve seat on setting stopper slot in；Adjusting screw
The adjusting screw external screw thread being arranged by outside is screwed with the adjusting screw installation female thread of setting on valve body, covers in the middle part of feedback rod
It is loaded on the eccentric of adjusting screw to adjust on circle, and the radial hole cooperation arranging on its left end bulb and valve pocket, the installation of right-hand member bulb
In the feedback groove of servoBcylinder；Return spring holder is installed in valve body, and is provided with return spring holder for sealing blocking
Plug screw；Additionally, oil circuit is divided into oil-feed, oil-control and three parts of oil return in valve body, oil-feed part be provided with the first oil inlet passage,
Second oil inlet passage, the 3rd oil inlet passage and the 4th oil inlet passage, oil controlling portion sets up separately and is equipped with the first left side oil-control passage, second left
Side oil-control passage, the first right side oil-control passage and the second right side oil-control passage, oil return part is provided with drainback passage, and oil-feed,
Three parts of oil-control and oil return connect each other；And have left side V-shaped groove and right side V-shaped valve element centre of gyration line is symmetrical
Groove.
2. modified model pilot valve according to claim 1 is it is characterised in that pull bar lock onto valve by trip bolt
On core is cylindrical.
3. modified model pilot valve according to claim 1 is it is characterised in that be provided with top positioning in adjusting screw
Cylindrical cylindrical with bottom positioning, and top positions the cylindrical adjusting screw top location hole cooperation with setting on valve body, bottom is fixed
The cylindrical adjusting screw bottom location hole cooperation with setting on valve body in position.
4. modified model pilot valve according to claim 1 is it is characterised in that be provided with fit sealing in adjusting screw
Nut.
5. modified model pilot valve according to claim 4 is it is characterised in that arrange on secure gland nut and valve body
Counterbore seal groove secured fit.
6. modified model pilot valve according to claim 1 is it is characterised in that arrange between plug screw and return spring holder
There is precompressed back-moving spring.
7. modified model pilot valve according to claim 1 is it is characterised in that valve element is inserted in the front end of return spring holder
In the reset seat breach of upper setting.
8. modified model pilot valve according to claim 1 is it is characterised in that left with regard to the valve pocket centre of gyration on valve pocket
The right side is symmetrically arranged with left oil canal and right oil canal.
9. modified model pilot valve control method is it is characterised in that specifically comprise the following steps that
Pressure oil through oil-feed part be delivered to valve element and valve pocket composition control port at, oil-control part one tunnel through right oil canal,
Second left side oil-control passage and first right side oil-control passage be delivered on the left of servo variable displacement cylinder, another road through left oil canal, second
Right side oil-control passage and the first left side oil-control passage are delivered on the right side of servo variable displacement cylinder, and when oil-control part one road input pressure oil
When, another road then becomes oil return part, and finally through outfan and drainback passage oil return unloading；In servo valve no external control
When, valve element is in relative normally off with valve pocket under return spring holder effect；When pull bar is along rotate counterclockwise, valve element and valve
Set is in staggered positions, connects oil circuit, and left passage walked by pressure oil, promotes servoBcylinder right lateral, now the oil on the right side of servoBcylinder is through the right side
Road returns and is discharged by outfan and drainback passage off-load, and servoBcylinder drives feedback rod to rotate around adjusting screw simultaneously, feedback
Bar is stirred valve pocket and is done rotate counterclockwise around valve element, promotes the oil circuit connected to trend towards closing, servoBcylinder rests on current location,
Whole hydraulic system is in dynamic balance state；Equally, when pull bar rotates clockwise, valve element and valve pocket are in staggered positions,
Connect oil circuit, right wing passage walked by pressure oil, promote servoBcylinder left lateral, now the oil on the left of servoBcylinder returns through left and by exporting
End and drainback passage off-load discharge, simultaneously servoBcylinder drive feedback rod around adjusting screw rotate, feedback rod stir valve pocket around
Valve element turns clockwise, and promotes the oil circuit connected to trend towards closing, servoBcylinder rests on current location, at whole hydraulic system
In dynamic balance state；Rotated along different directions by manipulating valve element, run along different directions with realizing servoBcylinder, and then drive
Hydraulic pump swash plate does different directions, thus realizing two-way pump oil, and the angle with Spool rotating is different, the fortune of servoBcylinder
Row stop position is also different, and the corresponding angle of inclination of swash plate also changes therewith, thus realizing the change that pump exports discharge capacity.
10. modified model pilot valve control method according to claim 9 it is characterised in that valve element be stepless regulated,
To realize the stepless change output of pumpage, valve element angle rotatable is 3 °～35 °, and actual logical oil promotes servoBcylinder operation angle
For 3 °～35 °, the motion mode that hydraulic system is in dynamic balance state is as follows:
When valve element no external control, the distance between left side V-shaped groove and top of right side V-shaped groove more than on valve pocket setting defeated
Enter to hold the diameter dimension of passage, therefore oil circuit is separated, be in normally off, input pressure oil is through system overflow valve off-load；Valve
The outfan channel diameter size putting setting is more than input channel diameter size, and the top of left side V-shaped groove and right side V-shaped groove
The distance between portion is less than the diameter dimension of the outfan passage of setting on valve pocket, and that is, right oil canal passes through right side V-shaped groove, Zuo Tong
Oil duct is in normally open by left side V-shaped groove and outfan, when valve element starts to turn clockwise from reset state, and rotates
When angle is less than 3 °, left side V-shaped groove and input are from off state to progressively opening, and left side V-shaped groove now and outfan
Aperture will be gradually reduced, right side V-shaped groove and input are in still closed mode, and the aperture of right side V-shaped groove and outfan will be by
Cumulative big, when left side V-shaped groove and input aperture are less than the aperture of left side V-shaped groove and outfan, input flows through left logical
The oil of oil duct, directly through outfan off-load, is now not enough to set up pressure in left oil canal, servoBcylinder is in the work of preloading spring power
With under be in zero-bit state, swash plate no tilts, and the discharge capacity of pump is zero；When valve element progressively rotates, promote left side V-shaped groove and input
Aperture be more than left side V-shaped groove and outfan aperture when, now set up pressure in left oil canal, and set up in left oil canal
Active force on servoBcylinder for action of hydraulic force when being more than preloading spring power, servoBcylinder will be run by promotion, and when this builds pressure
The critical anglec of rotation of valve element is 3 °, and left side V-shaped groove had both been connected with input and connected with outfan, the pressure oil that input pumps into
Part is used for making up servo cylinder system leakage, partly through outfan off-load；When β ° of Spool rotating over-angle, 3 ° < β ° < 35 °, this
When moment on the left of V-shaped groove only connect with left oil canal, left oil canal builds rapidly pressure, and servoBcylinder is promoted, meanwhile servoBcylinder
Drive feedback rod to stir valve pocket to turn clockwise, progressively promote left side V-shaped groove and the aperture of input to reduce, promote a left side simultaneously
Side V-shaped groove is gradually increased with the aperture of outfan, when the pressure oil that left side V-shaped groove can pass through with input aperture just makes up
When system leak and outfan off-load, servoBcylinder is out of service, and servo feedback system is now in hydraulic pressure dynamic balance state.
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| DE102016226039B3 (en) * | 2016-12-22 | 2018-02-08 | Danfoss Power Solutions Gmbh & Co. Ohg | DISPLACEMENT CONTROL ARRANGEMENT FOR AN AXIAL PISTON PUMP |
| DE102016015779A1 (en) | 2016-12-22 | 2018-06-28 | Danfoss Power Solutions Gmbh & Co. Ohg | Displacement control arrangement for an axial piston pump |
| CN108662205A (en) * | 2018-07-03 | 2018-10-16 | 浙江金浦实业有限公司 | A kind of lubricating oil automatic machining device |
| CN110657267B (en) * | 2019-11-15 | 2021-02-02 | 临沂市宇顺机械有限公司 | Unloading valve with overflow function |
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| FR2376980A1 (en) * | 1977-01-07 | 1978-08-04 | Lacombe Albert | Hydraulic circuit distributor valve - houses series of circuits in common housing and allows electrical control |
| DE19536553A1 (en) * | 1995-09-30 | 1997-04-03 | Eckehart Schulze | Electro-hydraulic control valve arrangement |
| CN201714730U (en) * | 2010-07-09 | 2011-01-19 | 无锡威孚精密机械制造有限责任公司 | Mechanical servo control valve |
| CN101871475B (en) * | 2010-07-09 | 2012-12-12 | 无锡威孚精密机械制造有限责任公司 | Mechanical servo control valve |
| CN204371813U (en) * | 2014-12-30 | 2015-06-03 | 南京萨伯工业设计研究院有限公司 | Modified model pilot valve |
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