CN103343758A - Hydraulic control type through-flow control valve bank, excavator movable arm hydraulic control system and excavator - Google Patents
Hydraulic control type through-flow control valve bank, excavator movable arm hydraulic control system and excavator Download PDFInfo
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- CN103343758A CN103343758A CN2013102868372A CN201310286837A CN103343758A CN 103343758 A CN103343758 A CN 103343758A CN 2013102868372 A CN2013102868372 A CN 2013102868372A CN 201310286837 A CN201310286837 A CN 201310286837A CN 103343758 A CN103343758 A CN 103343758A
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- 239000000945 filler Substances 0.000 claims description 7
- 239000010720 hydraulic oil Substances 0.000 claims description 7
- 230000033001 locomotion Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
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- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
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- 230000009977 dual effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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- 230000035939 shock Effects 0.000 description 1
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Abstract
The invention discloses a hydraulic control type through-flow control valve bank, which comprises a two-way cartridge valve (17) and a hydraulic control on-off valve (18), wherein the hydraulic control on-off valve comprises a first port (12 a) and a second port (A3), and a first oil port (A1) of the two-way cartridge valve (17) is hydraulically connected with the first port (12 a); and the control valve core (7) of the hydraulic control on-off valve (18) is provided with a stop position and a through position. In addition, the invention also discloses an excavator movable arm hydraulic control system and an excavator. In the excavator movable arm hydraulic control system, the oil pressure in the rodless cavity can slowly flow back to the oil tank through the hydraulic control on-off valve, so that the energy-saving and slow-speed control of the downward placement of the excavator movable arm can be realized, and the vibration and impact brought to the host can be further reduced.
Description
Technical field
The present invention relates to engineering machinery field, particularly, relate to a kind of hyraulic controlled type flow passage control valve group, comprise the excavator swing arm hydraulic control system of this hyraulic controlled type flow passage control valve group.In addition, the invention still further relates to a kind of excavator.
Background technique
Along with the development of engineering machinery technology, the tractor driver is more and more higher to the handling requirement of machinery.In the excavator operating process, tractor driver's action of control excavator of wishing to follow one's bent if control action speed more subtly, can improve the maneuverability of complete machine undoubtedly.
Application number is that 201010586361.0 patent of invention discloses a kind of excavator swing arm hydraulic control system.Wherein, by solenoid valve and regeneration valve, the dual control by electricity, liquid realizes that swing arm transfers, and the oil return of boom cylinder rodless cavity enters into rod chamber via regeneration valve, like this, has taken full advantage of the energy of swing arm deadweight, has also improved the speed that swing arm is transferred simultaneously.
In conjunction with described, swing arm descends and to need solenoid valve to control, electromagnet electricly can make oil cylinder start suddenly with dead electricity and stop suddenly, can cause certain compression shock like this, cause the vibration of structural member.Moreover the oil of rodless cavity was back to rod chamber when swing arm was transferred, though improved the speed that swing arm is transferred, the swing arm motional inertia is bigger, and especially under the operating mode that band carries, swing arm is motion actuated and can bring big vibratory impulse when stopping.
In a word, technique scheme can be brought bigger vibratory impulse to main frame.
Summary of the invention
An object of the present invention is to provide a kind of hyraulic controlled type flow passage control valve group.
Another object of the present invention provides a kind of excavator swing arm hydraulic control system that reduces to vibrate and impact.
To achieve these goals, the invention provides a kind of hyraulic controlled type flow passage control valve group, wherein, comprise two-way plug-in valve and hydraulic control on-off valve, this hydraulic control on-off valve comprises first port and second port, the first hydraulic fluid port hydraulic pressure of described two-way plug-in valve is connected in described first port, can flow to this first port with the hydraulic oil that makes described first hydraulic fluid port receive at least; And the control spool of described hydraulic control on-off valve has rest position and through-flow position, the driving of the hydraulic control oil that this control spool can the hydraulic control mouth by described hydraulic control on-off valve be introduced and move to described through-flow position from described rest position is at described control spool wherein that described first port and described second port end mutually under the state of described rest position; Be at described control spool that described first port and described second port are interconnected under the state of described through-flow position.
Preferably, first port of first hydraulic fluid port of described two-way plug-in valve and described hydraulic control on-off valve is interconnected.
Preferably, described hydraulic control on-off valve is Normally closed type hydraulic control on-off valve, this hydraulic control on-off valve comprises for described control spool is applied the elasticity pretightening force so that this control spool is in the Returnning spring of described rest position, and the driving of the hydraulic control oil that can introduce by described hydraulic control mouth of described control spool and overcome described elasticity pretightening force from described rest position and move to described through-flow position.
Preferably, the control spool of described hydraulic control on-off valve is installed in the control spool chamber of valve body of this hydraulic control on-off valve, and is installed as in this control spool chamber and can moves between described rest position and described through-flow position; Described control spool cooperatively interacts to being formed with first oil pocket that is communicated with described first port and second oil pocket that is communicated with described second port at least with described control spool chamber.
Preferably, described second oil pocket is formed on the position corresponding to described control spool one end, and described Returnning spring is installed in described second oil pocket so that described control spool is applied described elasticity pretightening force; And described hydraulic control interruption-forming is in the position corresponding to the described control spool the other end, can the other end of described control spool being exerted pressure by the hydraulic control oil that this hydraulic control mouth is introduced.
Preferably, described control spool comprises first seal section, be at described control spool described first oil pocket and described second oil pocket under the state of described rest position at least the outer circumferential face by described first seal section and described control spool chamber being sealed and matched of inner peripheral surface and end mutually.
Preferably, the outer circumferential face of described first seal section is formed with the first segment chute, the end of the cross-sectional flow area of this first segment chute along the movement direction of described spool from close described first oil pocket of this first segment chute reduces to the other end, so that the process that described control spool moves from described rest position to described through-flow position, the through-flow flow between described first oil pocket and described second oil pocket increases.
Preferably, described control spool and described control spool chamber cooperatively interact to also being formed with the middle oil pocket between described first oil pocket and described second oil pocket, also be formed with second seal section of taper on the described control spool, wherein be under the state of described rest position at described control spool, described first oil pocket and described in the middle of the cylinder of the outer circumferential face of oil pocket by described first seal section and the inner peripheral surface of described control spool chamber seal and end mutually, and oil pocket and described second oil pocket end mutually by the cone seal of described second seal section and described control spool cavity wall in the middle of described, thereby make described first oil pocket and described second oil pocket end mutually.
Preferably, oil pocket in the middle of the oil pocket and second in the middle of oil pocket comprises first in the middle of described, be formed with the 3rd seal section between described first seal section and described second seal section on the described control spool, be formed with second throttling groove on the 3rd seal section, wherein be under the state of described rest position at described control spool, described first oil pocket and described in the middle of first the cylinder of the outer circumferential face of oil pocket by described first seal section and the inner peripheral surface of described control spool chamber seal and end mutually, oil pocket and described second oil pocket end mutually by the cone seal of described second seal section and described control spool cavity wall in the middle of described second, and the inner peripheral surface of the outer circumferential face of described the 3rd seal section and described control spool chamber forms the cylinder sealing, so that oil pocket is divided into the described first middle oil pocket and the second middle oil pocket in the middle of described.
Preferably, described two-way plug-in valve and described hydraulic control on-off valve form the whole combination valve that shares described valve body, and first hydraulic fluid port of wherein said two-way plug-in valve and first port of described hydraulic control on-off valve are interconnected by the internal communication oil duct that is formed in the described valve body.
Preferably, the Returnning spring chamber of described two-way plug-in valve is interconnected by draining oil duct and the described middle oil pocket that is formed in the described valve body; Perhaps the Returnning spring chamber of described two-way plug-in valve is interconnected by being formed on the drain tap that being used on draining oil duct in the described valve body and the described valve body be connected in fuel tank.
Preferably, in the described valve body valve pocket is installed, described control spool chamber forms by the inner chamber of described valve pocket.
Preferably, the maximum through-flow flow of described hydraulic control on-off valve is less than the maximum through-flow flow of described two-way plug-in valve.
On the basis of the technological scheme of above-mentioned hyraulic controlled type flow passage control valve group, the present invention also provides a kind of excavator swing arm hydraulic control system, comprise that swing arm drives oil hydraulic cylinder, the rod chamber of this swing arm driving oil hydraulic cylinder and the hydraulic fluid port of rodless cavity hydraulic pressure respectively are connected in first working oil path and second working oil path, this first and second working oil path is connected to first and second actuator ports of pilot operated directional control valve, the filler opening of this pilot operated directional control valve and return opening are connected to main oil-feed oil circuit and main oil return circuit, thereby can switch oil-feeds that make in described first working oil path and second working oil path by described pilot operated directional control valve, another person's oil return drives the extension and contraction control of oil hydraulic cylinder to realize described swing arm, the first and second hydraulic control mouths of described pilot operated directional control valve both sides are connected in the first hydraulic control working oil path and the second hydraulic control working oil path respectively accordingly, the wherein said first and second hydraulic control working oil path are respectively applied to drive described pilot operated directional control valve and switch to the working state that makes that the piston rod of described swing arm oil hydraulic cylinder stretches out and withdraws, wherein, described excavator swing arm hydraulic control system also comprises the hyraulic controlled type flow passage control valve group described in the technique scheme, described second working oil path comprises the first oil circuit section and the second oil circuit section, the wherein said first oil circuit section is connected between second hydraulic fluid port of first actuator port of described pilot operated directional control valve and described two-way plug-in valve, and the described second oil circuit section is connected between the hydraulic fluid port of first hydraulic fluid port of described two-way plug-in valve and the rodless cavity that described swing arm drives oil hydraulic cylinder; Be connected with the first repairing oil circuit on described first working oil path, this first repairing oil circuit is provided with back pressure valve or one-way valve, wherein the forward port hydraulic pressure of this back pressure valve or one-way valve is connected to fuel tank or main oil return circuit, and reverse port is connected on described first working oil path; Second port of described hydraulic control on-off valve is connected in fuel tank or main oil return circuit via branch's oil return circuit; The hydraulic control mouth of described hydraulic control on-off valve is connected on the second hydraulic control working oil path of described pilot operated directional control valve; And the required on-off valve hydraulic control of the hydraulic control mouth of described hydraulic control on-off valve is opened oil pressure less than the required selector valve working state switching oil pressure of the second hydraulic control mouth of described pilot operated directional control valve.
Preferably, the required minimum on-off valve hydraulic control of the hydraulic control mouth of described hydraulic control on-off valve is opened oil pressure less than the required minimum selector valve working state switching oil pressure of the second hydraulic control mouth of described pilot operated directional control valve.
Preferably, be connected with the overflow oil circuit that is provided with relief valve respectively on the second oil circuit section of described second working oil path and described first working oil path.
Preferably, the second oil circuit section of described second working oil path also is connected with the second repairing oil circuit, this second repairing oil circuit is provided with back pressure valve or one-way valve, wherein the forward port hydraulic pressure of this back pressure valve or one-way valve is connected to fuel tank or main oil return circuit, and reverse port is connected on the second oil circuit section of described second working oil path.
In addition, the present invention also provides a kind of excavator, and wherein, this excavator comprises the excavator swing arm hydraulic control system described in the technique scheme.
Pass through technique scheme, because opening oil pressure, the required on-off valve hydraulic control of the hydraulic control mouth of hydraulic control on-off valve switches oil pressure less than the required selector valve working state of the second hydraulic control mouth of described pilot operated directional control valve, so can control the hydraulic control on-off valve by low oil pressure directly is communicated with fuel tank, thereby make the oil pressure in the rodless cavity flow back into fuel tank lentamente by way of the hydraulic control on-off valve, with realize that excavator swing arm transfers energy-conservation with control, and then can reduce vibration and the impact that brings to main frame at a slow speed.
Other features and advantages of the present invention will partly be described in detail in embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with following embodiment one, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the sectional structure schematic representation according to the hyraulic controlled type flow passage control valve group of preferred implementation of the present invention;
Fig. 2 is excavator swing arm hydraulic control system system schematic according to the embodiment of the present invention, and wherein pilot operated directional control valve is in meta;
Fig. 3 is excavator swing arm hydraulic control system system schematic according to the embodiment of the present invention, and wherein pilot operated directional control valve is in position, a left side;
Fig. 4 is excavator swing arm hydraulic control system system schematic according to the embodiment of the present invention, and wherein pilot operated directional control valve is in right position.
Description of reference numerals
1 oil hydraulic cylinder, 2 valve bodies
6 Returnning springs, 7 control spools
8 valve pockets, 10 first relief valves
11 second relief valves, 12 first oil pockets
12a first port one 3 internal communication oil ducts
Oil pocket in the middle of the 14 draining oil duct 15a first
17 two-way plug-in valves, 18 hydraulic control on-off valves
19 main oil-feed oil circuit 20 main oil return circuits
21 first working oil path, 22 second working oil path
The 22a first oil circuit section 22b second oil circuit section
23 branch's oil return circuits, 24 second back pressure valves
25 first back pressure valves, 26 first hydraulic control working oil path
27 second hydraulic control working oil path, 28 filler openings
29 return openings, 30 first actuator ports
31 second actuator ports, 32 first repairing oil circuits
101 rod chambers, 102 rodless cavities
701 first seal sections 702 the 3rd seal section
703 second seal section A1, first hydraulic fluid port
The A2 second hydraulic fluid port A3 second port
C1 hydraulic control mouth
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, should be understood that, embodiment described herein only is used for description and interpretation the present invention, and protection scope of the present invention is not limited to following embodiment.
Need to prove that at first the core technology design of hyraulic controlled type flow passage control valve group of the present invention is its annexation and hydraulic control relation, and does not lie in concrete valve mechanism.Fig. 1 helps those skilled in the art to understand and the specific constructive form that exemplifies; but protection scope of the present invention should be confined to these specific constructive form; under the technology enlightenment of this annexation and hydraulic control relation, the various concrete valve that those skilled in the art can expect connects the valve block structure that is combined into and all falls within protection scope of the present invention.
As shown in Figure 1, according to an aspect of the present invention, a kind of hyraulic controlled type flow passage control valve group is provided, wherein, comprise two-way plug-in valve 17 and hydraulic control on-off valve 18, this hydraulic control on-off valve comprises the first port one 2a and the second port A3, and the first hydraulic fluid port A1 hydraulic pressure of two-way plug-in valve 17 is connected in the first port one 2a, can flow to this first port one 2a with the hydraulic oil that makes the first hydraulic fluid port A1 receive at least; And preferably, the first hydraulic fluid port A1 of two-way plug-in valve 17 and first port one 2 of hydraulic control on-off valve 18 are interconnected, so that the hydraulic oil in the oil circuit can flow to the first port one 2a by the first hydraulic fluid port A1 all the time, thereby realize the control to hydraulic control on-off valve 18, here, the control spool 7 of hydraulic control on-off valve 18 has rest position and through-flow position, the driving of the hydraulic control oil that this control spool 7 can the hydraulic control mouth C1 by hydraulic control on-off valve 18 be introduced and move to through-flow position from rest position, be at control spool 7 wherein that the first port one 2a ends mutually with the second port A3 under the state of rest position, the hydraulic oil by first hydraulic fluid port A2 inflow can't flow out from the second port A3 by approach hydraulic control on-off valve 18 like this; Be at control spool 7 that the first port one 2a and the described second port A3 are interconnected under the state of through-flow position, like this, hydraulic oil can enter hydraulic control on-off valve 18 and flows out from the second port A3 by the first port one 2a.Here, hydraulic control on-off valve 18 is Normally closed type hydraulic control on-off valve, comprise for control spool 7 is applied the elasticity pretightening force so that control spool 7 is in the Returnning spring 6 of described rest position, and the driving of the hydraulic control oil that can introduce by hydraulic control mouth C1 of control spool 7 and overcome the elasticity pretightening force from rest position and move to through-flow position.
Particularly, the control spool 7 of hydraulic control on-off valve 18 is installed in the control spool chamber of valve body 2 of hydraulic control on-off valve 18, and in this control spool chamber, be installed as and between rest position and through-flow position, move, and preferably, valve pocket 8 is installed in the valve body 2, the inner chamber of control spool chamber by valve pocket 8 forms, and only needs that valve pocket 8 is processed the shape that is adapted to control spool 7 and packs into then and get final product in the valve body 2, can make process convenient.Control spool 7 cooperatively interacts to being formed with first oil pocket 12 that is communicated with the first port one 2a and second oil pocket 16 that is communicated with the second port A3 at least with the control spool chamber.Second oil pocket 16 is formed on the position corresponding to control spool 7 one ends, and is communicated with the second port A3, and Returnning spring 6 is installed in second oil pocket 16 so that control spool 7 is applied the elasticity pretightening force; And hydraulic control mouth C1 is formed on the position corresponding to control spool 7 the other ends, can the other end of control spool 7 being exerted pressure by the hydraulic control oil that this hydraulic control mouth C1 introduces, thereby overcome the elasticity pretightening force that 6 pairs of control of Returnning spring spool 7 applies, promote 7 motions of control spool.Need to prove, control spool 7 by the snug fit realization that is by the seal section on the spool and valve pocket 8 relevant positions, particularly, control spool 7 comprises first seal section 701, control spool 7 be in first oil pocket 12 and second oil pocket 16 under the state of rest position at least the outer circumferential face by first seal section 701 and described control spool chamber being sealed and matched of inner peripheral surface and end mutually, that is to say, in order to satisfy better sealing effect, more seal section can also be set, as long as taken into account Economy and functional satisfied.
As can be seen from Figure 1, the outer circumferential face of first seal section 701 is formed with the first segment chute, the end near first oil pocket 12 of the cross-sectional flow area of this first segment chute along the movement direction of spool 7 from this first segment chute reduces to the other end (i.e. the end of the close second port A3), so that the process that control spool 7 moves from rest position to through-flow position, the through-flow flow between first oil pocket 12 and second oil pocket 16 increases.
From Fig. 1, it can also be seen that, control spool 7 and described control spool chamber cooperatively interact to also being formed with the middle oil pocket between first oil pocket 12 and second oil pocket 16, also be formed with second seal section 703 of taper on the control spool 7, wherein be under the state of rest position at control spool 7, first oil pocket 12 ends with the cylinder sealing of the inner peripheral surface of control spool chamber mutually with the outer circumferential face of middle oil pocket by first seal section 701, and middle oil pocket and second oil pocket 16 end with the cone seal of control spool cavity wall mutually by second seal section, thereby win oil pocket 12 and second oil pocket 16 are ended mutually, thus, sealing has obtained better assurance.
According to preferred implementation of the present invention, two-way plug-in valve 17 forms the whole combination valve that shares described valve body 2 with described hydraulic control on-off valve 18, and wherein first port one 2 of the first hydraulic fluid port A1 of two-way plug-in valve 17 and hydraulic control on-off valve 18 is interconnected by the internal communication oil duct 13 that is formed in the valve body 2.Like this, on the one hand can be so that compact structure, that the space is arranged be more reasonable, on the other hand, whole combination valve can be used as independently that product puts goods on the market, to obtain economic benefit.
In order to guarantee the proper functioning of two-way plug-in valve 17, the Returnning spring chamber of two-way plug-in valve 17 is interconnected with middle oil pocket by the draining oil duct 14 that is formed in the valve body 2; Perhaps the Returnning spring chamber of two-way plug-in valve 17 can be interconnected by being formed on the drain tap that being used on draining oil duct 14 and the valve body 2 in the valve body 2 be connected in fuel tank.
Here, the maximum through-flow flow of hydraulic control on-off valve 18 is less than the maximum through-flow flow of two-way plug-in valve 17, and this setting is not limited to the present invention, this only is the relative set of carrying out in order to satisfy a certain specific function, when need of work, the maximum through-flow flow of hydraulic control on-off valve 18 also is fine more than or equal to the maximum through-flow flow of two-way plug-in valve 17.
According to another aspect of the present invention, referring to Fig. 2 to Fig. 4, the present invention also provides a kind of excavator swing arm hydraulic control system, comprise that swing arm drives oil hydraulic cylinder 1, the rod chamber 101 of this swing arm driving oil hydraulic cylinder 1 and the hydraulic fluid port of rodless cavity 102 hydraulic pressure respectively are connected in first working oil path 21 and second working oil path 22, this first working oil path 21 and second working oil path 22 are connected to first actuator port 30 and second actuator port 31 of pilot operated directional control valve 9, the filler opening 28 of pilot operated directional control valve 9 and return opening 29 are connected to main oil-feed oil circuit 19 and main oil return circuit 20, thereby can switch oil-feeds that make in described first working oil path and second working oil path by pilot operated directional control valve 9, another person's oil return drives the extension and contraction control of oil hydraulic cylinder 1 to realize swing arm, the first hydraulic control mouth a1 of pilot operated directional control valve 9 both sides and the second hydraulic control mouth b1 are connected in the first hydraulic control working oil path 26 and the second hydraulic control working oil path 27 respectively accordingly, wherein the first hydraulic control working oil path 26 and the second hydraulic control working oil path 27 are respectively applied to drive pilot operated directional control valve 9 and switch to the working state that makes that the piston rod of swing arm oil hydraulic cylinder 1 stretches out and withdraws, wherein, described excavator swing arm hydraulic control system also comprises the hyraulic controlled type flow passage control valve group described in the technique scheme, second working oil path 22 comprises the first oil circuit section 22a and the second oil circuit section 22b, wherein the first oil circuit section 22a is connected between the second hydraulic fluid port A2 of first actuator port 30 of pilot operated directional control valve 9 and two-way plug-in valve 17, and the second oil circuit section 22b is connected between the hydraulic fluid port of the first hydraulic fluid port A1 of two-way plug-in valve 17 and the rodless cavity 102 that swing arm drives oil hydraulic cylinder 1; Be connected with the first repairing oil circuit 32 on first working oil path 21, can be provided with first back pressure valve 25 or the one-way valve on this first repairing oil circuit 32, wherein the forward port hydraulic pressure of this first back pressure valve 25 or one-way valve is connected to fuel tank or main oil return circuit 20, reverse port is connected on first working oil path 21, can the rodless cavity 101 of oil hydraulic cylinder 1 being carried out repairing; The second port A3 of hydraulic control on-off valve 18 is connected in fuel tank or main oil return circuit 20 via branch's oil return circuit 23; The hydraulic control mouth C1 of hydraulic control on-off valve 18 is connected on the second hydraulic control working oil path 27 of pilot operated directional control valve 9; And the required on-off valve hydraulic control of the hydraulic control mouth C1 of hydraulic control on-off valve 18 is opened oil pressure less than the required selector valve working state switching oil pressure of the second hydraulic control mouth b1 of pilot operated directional control valve 9, particularly, the required minimum on-off valve hydraulic control of the hydraulic control mouth C1 of hydraulic control on-off valve 18 is opened oil pressure less than the required minimum selector valve working state switching oil pressure of the second hydraulic control mouth b1 of pilot operated directional control valve 9, that is to say, when the oil pressure in the second hydraulic control working oil path 27 just can make the control spool 7 of hydraulic control on-off valve 18 when moving to the cocurrent flow position by the position, the valve rod that described oil pressure also is not enough to control in the pilot operated directional control valve 9 moves.
In addition, can be connected with the overflow oil circuit that is provided with first relief valve 10 and second relief valve 11 respectively on the second oil circuit section 22b of second working oil path 22 and first working oil path 21.The second oil circuit section 22b of second working oil path 22 also is connected with the second repairing oil circuit, can be provided with second back pressure valve 24 or the one-way valve on this second repairing oil circuit, wherein the forward port hydraulic pressure of this second back pressure valve 24 or one-way valve is connected to fuel tank or main oil return circuit 20, and reverse port is connected on the second oil circuit section 22b of described second working oil path 22.
According to a further aspect of the invention, a kind of excavator also is provided, this excavator comprises the excavator swing arm hydraulic control system described in the technique scheme, and wherein, the swing arm of this excavator links to each other with piston rod in the oil hydraulic cylinder 1, like this, stretching out and withdrawing and to control the rising of excavator swing arm and transfer by the piston rod in the oil hydraulic cylinder 1.
Below, explain the working principle of excavator swing arm hydraulic control system provided by the invention by reference to the accompanying drawings.
As shown in Figure 3, when the first hydraulic control hydraulic fluid port a1 oil-feed, valve rod in the pilot operated directional control valve 9 moves so that pilot operated directional control valve 9 is in the position, a left side that shows among Fig. 2, on the one hand, filler opening 28 oil-feeds, the fluid approach first oil circuit section 22a arrives the second hydraulic fluid port A2, and enter the spool that two-way plug-in valve 17 backs down two-way plug-in valve 17 by the second hydraulic fluid port A2, flow out the first hydraulic fluid port A1 subsequently and enter rodless cavity 102 along the second oil circuit section 22b, on the other hand, the fluid in the rod chamber 101 is got back in the fuel tank through pilot operated directional control valve 9, return opening 29 along first working oil path 21.Like this, the piston rod that can promote in the oil hydraulic cylinder 1 is protruding, thereby excavator swing arm is risen.When piston rod was parked in a certain position, two-way plug-in valve 17 can be realized rodless cavity 102 pressurizes.
Referring to Fig. 2, when the second hydraulic control hydraulic fluid port b1 oil-feed, and when oil pressure is in low pressure area (for example 0.2-0.8MPa), the valve rod that the guide oil oil pressure is not enough to promote pilot operated directional control valve 9 commutates left, pilot operated directional control valve 9 still is in the state that meta ends like this, fluid in the oil hydraulic cylinder 1 can't be by filler opening 28 oil-feeds and by return opening 29 oil returns, but, since above mention the required minimum on-off valve hydraulic control of the hydraulic control mouth C1 of hydraulic control on-off valve 18 and open oil pressure and switch oil pressure less than the required minimum selector valve working state of the second hydraulic control mouth b1 of pilot operated directional control valve 9, at this moment, guide oil can promote to control spool 7 compression reseting springs 6 and move, and then win hydraulic fluid port A1 and the 3rd port A3 are communicated with, like this, under the pressure that the gravity effect of excavator swing arm produces, hydraulic oil in the rodless cavity 102 can pass through hyraulic controlled type flow passage control valve group (wherein needing 701 first segment chute through first sealing) and directly flow back into fuel tank, because the piston rod withdrawal in the oil hydraulic cylinder 1 can produce negative pressure at rod chamber 101 places at this moment, this negative pressure can make first back pressure valve 25 on the repairing oil circuit 32 of winning be opened for rod chamber 101 repairings, so just realized the free below of excavator swing arm, here, because the end near first oil pocket 12 of the cross-sectional flow area of the first segment chute of first seal section 701 along the movement direction of spool 7 from the first segment chute reduces to the other end, when changing from small to big, the oil pressure of guide oil can make control valve core 7 move (embodiment in Fig. 1 is for moving up) gradually, like this, the through-current capability of first segment chute strengthens gradually, the speed that swing arm descends also can accelerate with the increase of guide oil oil pressure, so, excavator swing arm can steadily be transferred under slower and controlled speed, thereby has reduced the vibratory impulse to main frame.
Referring to Fig. 4, when the second hydraulic control hydraulic fluid port b1 oil-feed, and when oil pressure is in zone of high pressure (for example 0.8-2.2MPa), valve rod in the pilot operated directional control valve 9 moves so that pilot operated directional control valve 9 is in the right position that shows among Fig. 4, filler opening 28 oil-feeds, fluid enters rod chamber 101 through first working oil path 21, thereby produce the pressure of the piston rod withdrawal that promotes in the oil hydraulic cylinder 1, like this, oil pressure in the rodless cavity 102 can impel the spool in the two-way plug-in valve 17 to move (embodiment in Fig. 4 is for moving up) and can make the control spool 17 in the hydraulic control on-off valve 18 move (embodiment in Fig. 4 is for moving up), like this, fluid part in the rodless cavity 102 flows out through the second hydraulic fluid port A2 of two-way plug-in valve 17, pass through pilot operated directional control valve 9 again, return opening 29 flows back into fuel tank, another part can flow back into fuel tank through the hydraulic control on-off valve 18 that is connected with two-way plug-in valve 17 hydraulic pressure, so just promote the piston rod retraction in the oil hydraulic cylinder 1, thereby make excavator swing arm under the power oil effect, descend (being that power is transferred), here, when the oil pressure of guide oil changes from small to big, the displacement of valve rod also becomes big gradually in the pilot operated directional control valve 9, the speed that swing arm descends also can accelerate along with the increase of guide oil oil pressure, so excavator swing arm can steadily be transferred under very fast and controlled speed.
In sum, use excavator swing arm hydraulic control system of the present invention, can realize that freely transferring with power of excavator swing arm transfer, free lowering velocity is slower, and the power lowering velocity is very fast, the speed that can transfer at inner control swing arm in a big way like this, reduce the vibratory impulse to main frame, in addition, this excavator swing arm hydraulic control system is simple in structure, cost is lower, and applicability is extremely strong.
Below describe preferred implementation of the present invention by reference to the accompanying drawings in detail; but; the present invention is not limited to the detail in the above-mentioned mode of execution; in technical conceive scope of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Need to prove that in addition each the concrete technical characteristics described in above-mentioned embodiment under reconcilable situation, can make up by any suitable manner.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between the various mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (18)
1. hyraulic controlled type flow passage control valve group, it is characterized in that, comprise two-way plug-in valve (17) and hydraulic control on-off valve (18), this hydraulic control on-off valve comprises first port (12a) and second port (A3), first hydraulic fluid port (A1) hydraulic pressure of described two-way plug-in valve (17) is connected in described first port (12a), can flow to this first port (12a) with the hydraulic oil that makes described first hydraulic fluid port (A1) receive at least; And
The control spool (7) of described hydraulic control on-off valve (18) has rest position and through-flow position, the driving of the hydraulic control oil that this control spool (7) can the hydraulic control mouth (C1) by described hydraulic control on-off valve (18) be introduced and move to described through-flow position from described rest position is at described control spool (7) wherein that described first port (12a) ends mutually with described second port (A3) under the state of described rest position; Be at described control spool (7) that described first port (12a) is interconnected with described second port (16) under the state of described through-flow position.
2. hyraulic controlled type flow passage control valve group according to claim 1 is characterized in that, first hydraulic fluid port (A1) of described two-way plug-in valve (17) is interconnected with first port (12a) of described hydraulic control on-off valve (18).
3. hyraulic controlled type flow passage control valve group according to claim 1, it is characterized in that, described hydraulic control on-off valve (18) is Normally closed type hydraulic control on-off valve, this hydraulic control on-off valve (18) comprises for described control spool (7) being applied the elasticity pretightening force so that this control spool (7) is in the Returnning spring (6) of described rest position, and the driving of the hydraulic control oil that can introduce by described hydraulic control mouth (C1) of described control spool (7) and overcome described elasticity pretightening force from described rest position and move to described through-flow position.
4. hyraulic controlled type flow passage control valve group according to claim 1, it is characterized in that, the control spool (7) of described hydraulic control on-off valve (18) is installed in the control spool chamber of valve body (2) of this hydraulic control on-off valve (18), and is installed as in this control spool chamber and can moves between described rest position and described through-flow position; Described control spool (7) cooperatively interacts to being formed with first oil pocket (12) that is communicated with described first port (12a) and second oil pocket (16) that is communicated with described second port (A3) at least with described control spool chamber.
5. hyraulic controlled type flow passage control valve group according to claim 4, it is characterized in that, described second oil pocket (16) is formed on the position corresponding to described control spool (7) one ends, and described Returnning spring (6) is installed in described second oil pocket (16) so that described control spool (7) is applied described elasticity pretightening force; And described hydraulic control mouth (C1) is formed on the position corresponding to described control spool (7) the other end, can the other end of described control spool (7) being exerted pressure by the hydraulic control oil that this hydraulic control mouth (C1) is introduced.
6. hyraulic controlled type flow passage control valve group according to claim 4, it is characterized in that, described control spool (7) comprises first seal section (701), be at described control spool (7) described first oil pocket (12) and described second oil pocket (16) under the state of described rest position at least the outer circumferential face by described first seal section (701) and described control spool chamber being sealed and matched of inner peripheral surface and end mutually.
7. hyraulic controlled type flow passage control valve group according to claim 6, it is characterized in that, the outer circumferential face of described first seal section (701) is formed with the first segment chute, the end of the cross-sectional flow area of this first segment chute along the movement direction of described spool (7) from close described first oil pocket (12) of this first segment chute reduces to the other end, so that the process that described control spool (7) moves from described rest position to described through-flow position, the through-flow flow between described first oil pocket (12) and described second oil pocket (16) increases.
8. hyraulic controlled type flow passage control valve group according to claim 6, it is characterized in that, the middle oil pocket that described control spool (7) and described control spool chamber cooperatively interact and be positioned between described first oil pocket (12) and described second oil pocket (16) for also being formed with, also be formed with second seal section (703) of taper on the described control spool (7), wherein be under the state of described rest position at described control spool (7), described first oil pocket (12) with described in the middle of outer circumferential face and the cylinder of the inner peripheral surface of described control spool chamber of oil pocket by described first seal section (701) seal and end mutually, and oil pocket and described second oil pocket (16) end mutually by the cone seal of described second seal section and described control spool cavity wall in the middle of described, thereby make described first oil pocket (12) and described second oil pocket (16) end mutually.
9. hyraulic controlled type flow passage control valve group according to claim 8, it is characterized in that, oil pocket (15b) in the middle of the oil pocket (15a) and second in the middle of oil pocket comprises first in the middle of described, be formed with the 3rd seal section (702) that is positioned between described first seal section (701) and described second seal section (703) on the described control spool (7), the 3rd seal section is formed with second throttling groove on (702), wherein be under the state of described rest position at described control spool (7), described first oil pocket (12) with described in the middle of first outer circumferential face and the cylinder of the inner peripheral surface of described control spool chamber of oil pocket (15a) by described first seal section (701) seal and end mutually, oil pocket (15b) ends with the cone seal of described control spool cavity wall by described second seal section (703) mutually with described second oil pocket (16) in the middle of described second, and the outer circumferential face of described the 3rd seal section (702) and the inner peripheral surface of described control spool chamber form the cylinder sealing, so that oil pocket is divided into the described first middle oil pocket (15a) and the second middle oil pocket (15b) in the middle of described.
10. hyraulic controlled type flow passage control valve group according to claim 8, it is characterized in that, described two-way plug-in valve (17) forms the whole combination valve that shares described valve body (2) with described hydraulic control on-off valve (18), and first hydraulic fluid port (A1) of wherein said two-way plug-in valve (17) is interconnected by the internal communication oil duct (13) that is formed in the described valve body (2) with first port (12) of described hydraulic control on-off valve (18).
11. hyraulic controlled type flow passage control valve group according to claim 10 is characterized in that, the Returnning spring chamber of described two-way plug-in valve (17) is interconnected with described middle oil pocket by the draining oil duct (14) that is formed in the described valve body (2); Perhaps the Returnning spring chamber of described two-way plug-in valve (17) is interconnected by the drain tap for being connected in fuel tank that is formed on the interior draining oil duct (14) of described valve body (2) and the described valve body (2).
12. hyraulic controlled type flow passage control valve group according to claim 4 is characterized in that, valve pocket (8) is installed in the described valve body (2), described control spool chamber forms by the inner chamber of described valve pocket (8).
13. according to each described hyraulic controlled type flow passage control valve group in the claim 1 to 12, it is characterized in that the maximum through-flow flow of described hydraulic control on-off valve (18) is less than the maximum through-flow flow of described two-way plug-in valve (17).
14. excavator swing arm hydraulic control system, comprise that swing arm drives oil hydraulic cylinder (1), the rod chamber (101) of this swing arm driving oil hydraulic cylinder (1) and the hydraulic fluid port of rodless cavity (102) hydraulic pressure respectively are connected in first working oil path (21) and second working oil path (22), this first and second working oil path (21,22) be connected to first and second actuator ports (30 of pilot operated directional control valve (9), 31), the filler opening (28) of this pilot operated directional control valve (9) and return opening (29) are connected to main oil-feed oil circuit (19) and main oil return circuit (20), thereby can switch the oil-feeds make in described first working oil path and second working oil path by described pilot operated directional control valve (9), another person's oil return drives the extension and contraction control of oil hydraulic cylinder (1) to realize described swing arm, the first and second hydraulic control mouth (a1 of described pilot operated directional control valve (9) both sides, b1) be connected in the first hydraulic control working oil path (26) and the second hydraulic control working oil path (27) respectively accordingly, the wherein said first and second hydraulic control working oil path (26,27) be respectively applied to drive described pilot operated directional control valve (9) and switch to the working state that makes that the piston rod of described swing arm oil hydraulic cylinder (1) stretches out and withdraws, it is characterized in that, described excavator swing arm hydraulic control system also comprises according to each described hyraulic controlled type flow passage control valve group in the claim 1 to 13, described second working oil path (22) comprises the first oil circuit section (22a) and the second oil circuit section (22b), the wherein said first oil circuit section (22a) is connected between second hydraulic fluid port (A2) of first actuator port (30) of described pilot operated directional control valve (9) and described two-way plug-in valve (17), and the described second oil circuit section (22b) is connected between the hydraulic fluid port of first hydraulic fluid port (A1) of described two-way plug-in valve (17) and the rodless cavity (102) that described swing arm drives oil hydraulic cylinder (1); Be connected with the first repairing oil circuit (32) on described first working oil path (21), this first repairing oil circuit (32) is provided with first back pressure valve (25) or one-way valve, wherein the forward port hydraulic pressure of this first back pressure valve (25) or one-way valve is connected to fuel tank or main oil return circuit (20), and reverse port is connected on described first working oil path (21); Second port (A3) of described hydraulic control on-off valve (18) is connected in fuel tank or main oil return circuit (20) via branch's oil return circuit (23); The hydraulic control mouth (C1) of described hydraulic control on-off valve (18) is connected on the second hydraulic control working oil path (27) of described pilot operated directional control valve (9); And the required on-off valve hydraulic control of the hydraulic control mouth (C1) of described hydraulic control on-off valve (18) is opened oil pressure less than the required selector valve working state switching oil pressure of the second hydraulic control mouth (b1) of described pilot operated directional control valve (9).
15. opening oil pressure, the required minimum on-off valve hydraulic control of the hydraulic control mouth (C1) of described hydraulic control on-off valve (18) switches oil pressure less than the required minimum selector valve working state of the second hydraulic control mouth (b1) of described pilot operated directional control valve (9).
16. be connected with the overflow oil circuit that is provided with first and second relief valves (10,11) respectively on the second oil circuit section (22b) of described second working oil path (22) and described first working oil path (21).
17. the second oil circuit section (22b) of described second working oil path (22) also is connected with the second repairing oil circuit, this second repairing oil circuit is provided with second back pressure valve (24) or one-way valve, wherein the forward port hydraulic pressure of this second back pressure valve (24) or one-way valve is connected to fuel tank or main oil return circuit (20), and reverse port is connected on the second oil circuit section (22b) of described second working oil path (22).
18. an excavator is characterized in that, this excavator comprises any described excavator swing arm hydraulic control system in the claim 14 to 17.
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| CN201310286837.2A CN103343758B (en) | 2013-07-09 | 2013-07-09 | Hydraulic control type through-flow control valve bank, excavator movable arm hydraulic control system and excavator |
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Cited By (1)
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| CN113685394A (en) * | 2021-08-31 | 2021-11-23 | 徐州徐工矿业机械有限公司 | High-pressure large-flow oil cylinder regeneration hydraulic system of excavator |
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