CN105545850B - A kind of load-sensitive duty valve and its banked direction control valves, hydraulic system, mini-excavator - Google Patents
A kind of load-sensitive duty valve and its banked direction control valves, hydraulic system, mini-excavator Download PDFInfo
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- CN105545850B CN105545850B CN201410588415.5A CN201410588415A CN105545850B CN 105545850 B CN105545850 B CN 105545850B CN 201410588415 A CN201410588415 A CN 201410588415A CN 105545850 B CN105545850 B CN 105545850B
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Abstract
The present invention relates to a kind of load-sensitive duty valve and its banked direction control valves, hydraulic system, mini-excavator, it is at least included with pilot control hydraulic fluid port, oil return opening and the valve body for feeding back hydraulic fluid port, and the valve body is interior at least provided with proportioning valve and check valve；The proportioning valve has first chamber and the second chamber with spring；Oil inlet of the first chamber simultaneously with the feedback hydraulic fluid port, the pilot control hydraulic fluid port and the check valve is connected；The oil inlet of the proportioning valve is connected with the oil-out and the second chamber of the check valve simultaneously, and oil-out is connected with the oil return opening.The present invention can be when excavator height load frequent switches operation according to the rapid foundation of system needs and removal feedback pressure oil circuit pressure, the delay wait for load sensitive system function of eliminating the effects of the act and flow mismatch phenomenon, improve the operating characteristics and operating efficiency of complete machine.
Description
Technical field
The present invention relates to a kind of engineering machinery field, more particularly to a kind of load-sensitive duty valve and its banked direction control valves, hydraulic pressure
System, mini-excavator.
Background technology
In load-sensitive (English full name：Load Sensitive；English abbreviation：LS) in hydraulic system, load pressure is anti-
Variable pump is fed to, the hydraulic power of control variable pump almost only needed for output system reduces power loss to greatest extent.It is small-sized
In the load-sensitive hydraulic system of excavator, executing agency's composite move is more, feeds back to the LS pressure signals of pump from all
Maximum one in load pressure.After operation handle returns to middle position, the characteristics of being saved in itself for load-sensitive hydraulic system
And the need for protection element, the rapid pressure release of fuel tank will be connected by feeding back to the LS pressure signals of pump.After new operation is performed, instead
Feed voltage power oil circuit will set up the pivot angle variable that pressure carrys out controlling pump rapidly.
At present, it is function that load-sensitive is realized in mini-excavator load-sensitive hydraulic system, i.e., in executing agency
Feedback pressure oil circuit pressure release makes pump only export when feedback pressure controlling pump displacement variation and executing agency's stopping are set up during action
Minimum discharge this purpose of load sensitive system is maintained mainly to employ following this method：
Throttle orifice is set on first or the tail connection of load sensing multi-way valve, the throttle orifice is by feedback pressure oil circuit with returning
Oily oil communication.When executing agency acts, pressure is suppressed height by load-sensitive hydraulic system by throttle orifice, sets up feedback pressure
Carry out controlling pump displacement variation；When executing agency stops, the pressure that feedback pressure oil circuit is set up passes through throttle orifice release.
Fig. 1 is illustrated that the first load sensing multi-way valve (HUSCO SCX120 load sensing multi-way valves) in the prior art
Schematic diagram, Fig. 2 is illustrated that the schematic diagram of second of load sensing multi-way valve in the prior art, and both banked direction control valves are all in head
Set gradually between the feedback pressure oil circuit and oil return circuit of connection filter 1a and filter 2a, throttle orifice 1b and throttle orifice 2b with
And pressure-reducing valve 1c and pressure-reducing valve 2c, feedback controlled pressure and release are set up by throttle orifice, is maintained by pressure-reducing valve by throttling
The stability of flow in hole.Fig. 2 technical scheme is unlike Fig. 1：Load sensing multi-way valve in Fig. 2 is also set in its tail connection
The elements such as filter, throttle orifice and pressure-reducing valve are put, it is therefore an objective to further control the stability of flow in feedback pressure oil circuit.
The principle of the third load sensing multi-way valve (SX12 load sensing multi-way valves) in the prior art is shown in Fig. 3
Figure, be with the scheme identical shown in Fig. 1 and Fig. 2：Throttle orifice is set to realize function in first.Difference is：It
Using the flow speed control valve 3b with filter, i.e., what is set between feedback pressure oil circuit and oil return circuit is filter 3a, decompression successively
Valve and throttle orifice 3c, element order are different, but control the pressure of pressure-reducing valve to be all derived from the two ends of throttle orifice, and pressure-reducing valve can rise
To the effect for stablizing throttle orifice flow.
In summary, at least there are following shortcomings in current load sensing multi-way valve：
1st, throttle orifice is set on the feedback pressure oil circuit and oil return circuit joined in the first and/or tail of load sensing multi-way valve
Method, although feedback pressure can be set up when executing agency acts, unload feedback pressure oil circuit when executing agency stops
Pressure, but in the mini-excavator field for valuing operating efficiency, because composite move is more, action switching is very frequent, and load
Difference is larger, is easy to occur operation handle when low-load acts and acts and switch to high capacity and has moved position to, and feedback pressure
Oil circuit does not set up the phenomenon of enough pressure control pump variables also, and this wait or delay have a strong impact on operation effect
Rate.
2nd, it is negative in height further, since the pressure of feedback pressure oil circuit needs the regular hour by the complete release of throttle orifice
Load act to low-load act switch when, the pressure of feedback pressure oil circuit may also be unloaded not over throttle orifice be pressed onto low-load move
During the pressure value of work, low-load has just been acted, and the too high LS feedback pressures now acted on pump cause what pump was exported
The demand of flow and low-load actuator is not matched that, so as to influence the function of load sensitive system, causes excavator operability
Bad, operating efficiency is low.
The content of the invention
The purpose of the present invention is to propose to a kind of load-sensitive duty valve and its banked direction control valves, hydraulic system, mini-excavator, its
It can disappear when excavator height load frequent switches operation according to the rapid foundation of system needs and removal feedback pressure oil circuit pressure
Delay wait and flow except influence load sensitive system function mismatch phenomenon, improve the operating characteristics and operation effect of complete machine
Rate.
To achieve the above object, the present invention provides following technical scheme：
A kind of load-sensitive duty valve, it is at least included with pilot control hydraulic fluid port, oil return opening and the valve body for feeding back hydraulic fluid port,
At least provided with proportioning valve and check valve in the valve body；The proportioning valve has first chamber and the second chamber with spring；
Oil inlet of the first chamber simultaneously with the feedback hydraulic fluid port, the pilot control hydraulic fluid port and the check valve is connected；It is described
The oil inlet of proportioning valve is connected with the oil-out and the second chamber of the check valve simultaneously, and oil-out connects with the oil return opening
It is logical.
Further, the valve body is at least provided with the feedback oil duct being connected with the feedback hydraulic fluid port.
Further, the feedback hydraulic fluid port extends the feedback oil to be formed and be connected with the feedback oil duct towards the valve inner
Hole.
Further, it is described feedback oilhole be stepped hole, at least including house the check valve and with the feedback oil duct
The aperture that directly connects and the macropore for housing the first screw plug for the stroke limit to the check valve.
Further, first screw plug is dug and the steel in the check valve with the end face that the check valve is in contact
The groove that ball is adapted.
Further, the through hole of interior hexagonal structure is offered in the middle part of first screw plug.
Further, first screw plug is connected with the inner thread of the macropore.
Further, the proportioning valve at least also includes valve element, and the pilot control hydraulic fluid port extends towards the valve inner
Form the clear opening for housing the spring and the valve element；The valve element is moved by compressing the spring along the clear opening,
So that the oil return opening is connected or ended with feedback oilhole.
Further, it is additionally provided with the clear opening between the pilot control hydraulic fluid port and the valve element for the valve
Second screw plug of the stroke limit of core, the clear opening where second screw plug forms the first chamber, the spring institute
The clear opening form the second chamber.
Further, the through hole of interior hexagonal structure is offered in the middle part of second screw plug.
Further, second screw plug is connected with the inner thread of the clear opening.
Further, it is additionally provided with the valve body and connects the first chamber and the first oil duct of the macropore.
Further, it is additionally provided with the valve body and connects the second chamber and the second oil duct of the feedback oil duct.
Further, the oil return opening extends towards the valve inner, through the clear opening and is communicated to the aperture,
Form the 3rd oil duct.
The present invention also provides a kind of load sensing multi-way valve, at least including first and be arranged on the first load it is quick
Feel duty valve；The load-sensitive duty valve is the described load-sensitive duty valve in the various embodiments described above, and the load is quick
Feel the feedback pressure oil communication of feedback hydraulic fluid port and the banked direction control valves of duty valve, the oil return opening of the load-sensitive duty valve with
Respectively join in the oil return circuit connection of the banked direction control valves, the pilot control hydraulic fluid port and the banked direction control valves of the load-sensitive duty valve
Guide's oil circuit is connected.
The present invention also provides a kind of load-sensitive hydraulic system, and it at least includes the described load in the various embodiments described above
Sensitive function valve.
The present invention also provides a kind of mini-excavator, and it at least includes the described load-sensitive work(in the various embodiments described above
Energy threshold.
Due in the valve body of load-sensitive duty valve provided by the present invention at least provided with proportioning valve and check valve, and will
Oil inlet of the not chamber with spring of proportioning valve simultaneously with the feedback hydraulic fluid port on valve body, pilot control hydraulic fluid port and check valve connects
It is logical, while oil-out and the chamber with spring of proportioning valve by the oil inlet of proportioning valve simultaneously with check valve, will also compare
The oil-out of example valve is connected with oil return opening, therefore when there is actuator to need action, guide oil is via load-sensitive duty valve
Pilot control hydraulic fluid port, oil return opening and feedback hydraulic fluid port cut-off, feedback pressure oil circuit and oil return circuit in load sensing multi-way valve it
Between passage cut-out, it is rapid in feedback pressure oil circuit to set up pressure and act on pump, make the flow needed for pump only output system；This
When, if load pressure is raised, feedback pressure oil circuit is also rapid therewith to be raised, and the LS feedback pressures in load-sensitive duty valve are built
Vertical speed is very fast, and feedback pressure is set up rapidly during low-load is switched fast to high capacity, and liquid is exported with controlling pump
Flow and pressure required for pressure system, eliminate because LS pressure set up it is slow and caused by executing agency action wait phenomenon,
Improve operating efficiency；If load pressure declines, the height of the oil-out of check valve in load-sensitive duty valve is acted on before
Pressure will force closed check valve, while oil return opening is connected with feedback hydraulic fluid port, feedback pressure oil circuit is connected with oil return circuit, make anti-
Feed voltage power oil circuit release, until the oil-out pressure of check valve is equal to load pressure, now the pressure signal of LS feedbacks is equal to negative
Carry pressure, the flow needed for controlling pump only output system；When actuator stopping is acted, due to the guide of load-sensitive duty valve
The distress resolves of control port, feedback pressure oil circuit connects the rapid release of fuel tank, and LS feedback pressure removal speed is very fast, in height
Load and feedback pressure oil circuit pressure is down to low-load from high capacity rapidly during being switched fast to low-load, it is ensured that feedback
The authenticity of LS pressure signals on to pump, it is to avoid cause because LS feedback pressures are too high pressure and flow that pump is exported with it is low negative
The mismatch of actuator demand is carried, so as to improve the operating characteristics and operating efficiency of complete machine.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of the first load sensing multi-way valve in the prior art；
Fig. 2 is the schematic diagram of second of load sensing multi-way valve in the prior art；
Fig. 3 is the schematic diagram of the third load sensing multi-way valve in the prior art；
Fig. 4 is the schematic diagram of the embodiment of load-sensitive duty valve one provided by the present invention；
Fig. 5 is the overall structure assembling front sectional view of load-sensitive duty valve in Fig. 4；
The principle for the embodiment of load sensing multi-way valve one that Fig. 6 is applied by load-sensitive duty valve provided by the present invention
Figure.
Embodiment
To make the purpose, technical scheme and advantage of the invention implemented clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label represent same or similar element or the element with same or like function.Described embodiment is the present invention
A part of embodiment, rather than whole embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to uses
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.Under
Embodiments of the invention are described in detail with reference to accompanying drawing for face.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " is based on accompanying drawing institutes
The orientation or position relationship shown, is for only for ease of the description present invention and simplifies description, rather than indicate or imply signified dress
Put or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to present invention protection
The limitation of scope.
The schematic diagram of the embodiment of load-sensitive duty valve one provided by the present invention is shown in Fig. 4, can from figure
Go out, the load-sensitive duty valve 100 in the present embodiment at least includes valve body 1, valve body 1 has pilot control hydraulic fluid port Pi, oil return inlet T
With feedback hydraulic fluid port LS, at least provided with proportioning valve 2 and check valve 3 in the valve body 1.Proportioning valve 2 has first chamber 21, with bullet
The second chamber 23 and valve element 24 of spring 22, first chamber 21 is simultaneously with feeding back hydraulic fluid port LS, pilot control hydraulic fluid port Pi and check valve 3
Oil inlet is connected；The oil inlet of proportioning valve 2 is connected with the oil-out and second chamber 23 of check valve 3 simultaneously, oil-out and oil return
Mouth T connections.I in above-mentioned Pi is the integer more than or equal to 1, and the load-sensitive applied with load-sensitive duty valve 100 is more
The guide's oil circuit Pi of road valve is corresponding.In view of the demand, ratio such as two passages in the present embodiment and lightweight and material are few
Valve 2 uses the proportioning valve of bi-bit bi-pass, but not limited to this.
When there is actuator to need action, pilot control hydraulic fluid port Pi of the guide oil via load-sensitive duty valve, oil return inlet T
End with feedback hydraulic fluid port LS, the passage between feedback pressure oil circuit and oil return circuit in load sensing multi-way valve is cut off, feedback
Setting up pressure acts on pump rapidly in pressure oil circuit, makes the flow needed for pump only output system；Now, if load pressure liter
Height, the also rapid rise therewith of feedback pressure oil circuit, it is very fast that LS feedback pressures set up speed, is quickly cut to high capacity in low-load
Feedback pressure is set up rapidly during changing, with the flow and pressure required for controlling pump output hydraulic pressure system, is eliminated because of LS
Pressure sets up executing agency's action that is slow and causing and waits phenomenon, improves operating efficiency.If load pressure declines, before
Acting on the high pressure of the oil-out of check valve 3 in load-sensitive duty valve will force check valve 3 to be closed, at the same oil return inlet T and
Hydraulic fluid port LS connections are fed back, feedback pressure oil circuit is connected with oil return circuit, makes feedback pressure oil circuit release, until going out for check valve 3
Hydraulic fluid port pressure is equal to load pressure, and now the pressure signal of LS feedbacks is equal to needed for load pressure, controlling pump only output system
Flow；When actuator stopping is acted, due to the distress resolves of the pilot control hydraulic fluid port of load-sensitive duty valve, feedback pressure oil
The rapid release of fuel tank is connected on road, and LS feedback pressure removal speed is very fast, during high capacity is switched fast to low-load
Feedback pressure oil circuit pressure is down to low-load from high capacity rapidly, it is ensured that the authenticity of the LS pressure signals fed back on pump,
The pressure for causing pump to export because LS feedback pressures are too high and flow and the mismatch of low-load actuator demand are avoided, so as to carry
The operating characteristics and operating efficiency of high complete machine.
Fig. 5 assembles front sectional view for the overall structure of the embodiment of load-sensitive duty valve one provided by the present invention.Such as
Shown in Fig. 5, as a kind of preferred embodiment of load-sensitive duty valve 100, valve body 1 is at least provided with feeding back hydraulic fluid port LS phases
The feedback oil duct 4 of connection.Hydraulic fluid port LS is fed back towards the inside of valve body 1 extension formation feedback oilhole 5, as connection feedback oil duct 4 and instead
Present hydraulic fluid port LS.
Specifically, feedback oilhole 5 is rendered as stepped hole, at least including aperture 51 and macropore 52, wherein：
Aperture 51 is used to house check valve 3 and directly connected with feedback oil duct 4.The left end of the spring of check valve 3 is abutted to
The bottom of aperture 51, right-hand member is connected with the steel ball of check valve 3.The pressure setting scope of the spring of check valve 3 needs satisfaction can be with
Overcome as small as possible on the premise of the frictional resistance and inertia force of valve element in check valve 3, to avoid pressure oil from being produced by check valve
Raw larger pressure drop, therefore according to the scope of check valve frictional resistance and inertia force sum between 0.3bar to 0.5bar, can
Using determine check valve 3 spring pressure setting scope as 0.3bar to 0.5bar.
Macropore 52 is used to house the first screw plug 6, and the stroke progress that the first screw plug 6 is used for check valve 3 is spacing.First screw plug
6 end faces being in contact with check valve 3 dig the groove (being to show in figure) being adapted with the steel ball of check valve 3, i.e., sphere is recessed
Groove, it is ensured that the tight fit with the steel ball of check valve 3, to meet one-way flow function.The periphery wall of first screw plug 6 is provided with outer
Screw thread, the bottom of the inwall of macropore 52 is provided with screw thread, therefore, and the first screw plug 6 is connected that there is provided axle with the inner thread of macropore 52
To power to be balanced each other with spring force.In use, the first screw plug 6 is screwed into macropore 52, the steel ball of check valve 3 is compacted.The
The middle part of one screw plug 6 offers the through hole of interior hexagonal structure, meet while dismounting is required for control oil passage is provided.
Pilot control hydraulic fluid port Pi forms the clear opening 7 of putting spring 22 and valve element 24 towards the extension of the inside of valve body 1.During installation,
One end connecting spring 22 of valve element 24, spring 22 is abutted to the bottom of clear opening 7, and the other end is towards pilot control hydraulic fluid port Pi.
The pressure produced from the pilot control hydraulic fluid port Pi guide oils entered is applied to one end of valve element 24, and valve element 24 passes through compression spring 22
Moved along clear opening 7, oil return inlet T can be made to end or connect with feedback oilhole 5.In the present embodiment, valve element 24 uses two
Position two-way valve core, the pressure setting scope of spring 22 is set to 20bar to 30bar.With reference to Fig. 4 and Fig. 5 to spring 22
The selected principle of pressure setting range is illustrated：
Principle one, when there is executive component work, pilot pressure should be able to push the spring 22 compress, make the right side of proportioning valve 2
Position enters working position；Principle two, when load pressure is reduced, the valve element 24 of proportioning valve 2 should move right in time, make feedback pressure
Pressure release is to load pressure as early as possible for the pressure of oil circuit, with the authenticity for the pressure for ensureing feedback pressure oil circuit, so as to optimize pump valve
Match somebody with somebody.On principle one, the elastic force of spring 22 should be less than pilot pressure, and pilot pressure is typically between 30bar to 40bar；Meanwhile,
On principle two, when load pressure is reduced, spring force and the feedback pressure sum of oil duct 4 of the left end of the valve element 24 of proportioning valve 2
The pilot pressure and load pressure (pressure of the first oil duct 9) sum on the right side of valve element 24 should be more than as early as possible.Referred herein to it is anti-
The pressure of feedback oil duct 4 represents that the dotted line on right side represents load pressure by the dotted line of the left end of valve element 24 of proportioning valve 2, in load pressure
When power is raised, check valve 3 is turned on, and now the pressure approximately equal of the left end of valve element 24 and right-hand member (is made on condition that ignoring check valve
Into pressure drop, be a 1bar left sides by the pressure drop of metered flow when above-mentioned one-way valve spring range of regulation is 0.3bar to 0.5bar
The right side, can be neglected herein)；When load pressure is reduced, due to there is a unidirectional locked effect of check valve 3, the left end of valve element 24 it is anti-
The load pressure that oil duct pressure is more than right-hand member is presented, when this difference is more than the difference of pilot pressure and the set pressure of spring 22,
Valve element 24 is moved to right.Two require to show that pilot pressure and the difference of the set pressure of spring 22 are got over hour on principle, valve element 24 is moved to right
Response time it is smaller, i.e. the set pressure of spring 22 is better closer to pilot pressure.Consider further that the requirement of principle one is reserved
10bar surplus ensures that pilot pressure can set up system LS pressure with Fast Compression spring 22, so the range of regulation of spring 22
It is set to 20bar-30bar.
In above-described embodiment, it is additionally provided with the clear opening 7 between pilot control hydraulic fluid port Pi and valve element 24 for valve element
24 stroke carries out the second spacing screw plug 8, the first chamber 21 of the formation proportioning valve 2 of clear opening 7 where second screw plug 8,
The second chamber 23 of the formation proportioning valve 2 of clear opening 7 where spring 22.Second screw plug 8 is when compressing valve element 24, it can be ensured that the
Two chambers 23 keep unimpeded by feeding back oil duct 4 and feedback hydraulic fluid port LS.
The stroke progress that second screw plug 8 is used for valve element 24 is spacing.The periphery wall of second screw plug 8 is provided with external screw thread, directly
The internal partial wall of through hole 7 is provided with screw thread, therefore, the second screw plug 8 be connected with the inner thread of clear opening 7 there is provided axial force with
Balanced each other with spring force.In use, the second screw plug 8 is screwed into clear opening 7.The middle part of second screw plug 8 offers interior six
The through hole of corner structure, meet while dismounting is required for control oil passage is provided.
In addition, the first chamber 21 of proportioning valve 2 can be connected by the oil duct inside valve body 1 with feedback hydraulic fluid port LS, than
Such as：Connection first chamber 21 and the first oil duct 9 of macropore 52 can be additionally provided with valve body 1.When the holddown spring 22 of valve element 24
When making feedback oilhole 5 with oil return inlet T cut-off, pilot control hydraulic fluid port Pi, the first oil duct 9, feedback oilhole 5, feedback oil duct 4 and second
The loop is accessed in the right position that chamber 23 forms a loop, i.e. valve element 24.The need for due to processing, the first oil duct 9 is extended to
The surface of valve body 1, is formed through hole on the surface of valve body 1, can be blocked the through hole using Drawing type upset bolt 14.
Certainly, the second chamber 23 of proportioning valve 2 can also be connected by the oil duct inside valve body 1 with feedback oil duct 4, example
Such as：Connection second chamber 23 and the second oil duct 10 of macropore 52 can be additionally provided with valve body 1.When the holddown spring 22 of valve element 24
When making feedback hydraulic fluid port LS with oil return inlet T cut-off, pilot control hydraulic fluid port Pi, the first oil duct 9, feedback oilhole 5, feedback oil duct 4, second
The loop is accessed in the right position that oil duct 10 and second chamber 23 form a loop, i.e. valve element 24.The need for due to processing, second
Oil duct 10 extends to the surface of valve body 1, forms through hole on the surface of valve body 1, can be blocked the through hole using Drawing type upset bolt 14.
Similarly, oil return inlet T can also be connected by the oil duct inside valve body 1 with feedback oilhole 5, specifically, make oil return
Mouthful T extends towards the inside of valve body 1, through clear opening 7 and is communicated to aperture 51, forms the 3rd oil duct 11.When the holddown spring of valve element 24
22 can not be such that feedback oilhole 5 ends with oil return inlet T, i.e., when feedback oilhole 5 is connected with oil return inlet T, second chamber 23, the second oil duct
10th, the loop is accessed in the left position of feedback oil duct 4, aperture 51, the 3rd oil duct 11 and oil return inlet T formation one loop, i.e. valve element 24,
Fluid in second chamber 23 can be successively via the second oil duct 10, feedback oil duct 4, aperture 51, the 3rd oil duct 11 and oil return opening
T, carries out release.
When load-sensitive duty valve 100 in above-described embodiment works, when there is actuator to need action, guide oil passes through
Pilot control hydraulic fluid port Pi and the second screw plug 8 act on valve element 24, and valve element 24 is moved, and the right position access loop of valve element 24, cut-out is anti-
The 3rd oil duct 11 between oilhole 5 and oil return inlet T is presented, system sets up LS feedback pressure controlling pump variables.Now, if load pressure
Power is raised, because the 3rd oil duct 11 is cut-off state, feeds back the pressure also rapid rise therewith, the first oil duct 9, feedback of oil duct 4
Pressure in oilhole 5, feedback oil duct 4, the second oil duct 10 and second chamber 23 is equal to load pressure, the first oil duct 9 and second
The pressure of oil duct 10 acts on the two ends of valve element 24, it is ensured that the 3rd oil duct 11 is cut-off state；It is if load pressure declines, i.e., anti-
The pressure for presenting oilhole 5 declines, and now the pressure on the left of the steel ball of check valve 3 is more than the pressure on the right side of it, and steel ball is compacted first
On screw plug 6, cut off between the first oil duct 9 and the second oil duct 10, their pressure is respectively acting on the two ends of valve element 24, and due to
The pressure of the left end of valve element 24 is more than right-hand member, therefore valve element 24 commutates, and loop is accessed in left position, now feeds back oilhole 5 and passes through the 3rd oil
Road 11 connects fluid in oil return inlet T, feedback oil duct 4 by oil return inlet T release, until check valve 3 is opened, now the first oil duct
9 connect again with the second oil duct 10, and valve element 24 commutates, and loop, cut-out feedback oilhole 5 and oil return inlet T path are accessed in right position, set up
The pressure of feedback pressure oil circuit, while declining load pressure, feedback pressure oil circuit pressure also declines therewith, meets and returns to pressure
Power follows the function that load changes.When actuator stopping is acted, due to pilot control hydraulic fluid port Pi distress resolves, valve element 24 is changed
To, left position access system, loop is turned between feedback oilhole 5 and oil return inlet T, and pressure oil passes through the first screw plug 6, check valve 3, the
Three oil ducts 11 and the rapid release of oil return inlet T.
The embodiment of load sensing multi-way valve one that load-sensitive duty valve provided by the present invention is applied is shown in Fig. 6
Schematic diagram, two work connection of small type hydraulic excavator load sensing multi-way valve are illustrate only in figure, in order to accurately illustrate
The installation site of load-sensitive multifunction valve provided by the present invention, and avoid the schematic diagram excessively lengthy and jumbled, small-sized hydraulic is dug
Remaining the six work connection and guide's oil circuit of pick machine load sensing multi-way valve are not shown in FIG. 6.
As shown in fig. 6, the present invention also provides a kind of load sensing multi-way valve 200, it at least includes first (oil-feed connection), set
Put in the load-sensitive duty valve of the first, through each valve body and from tail connection (oil return connection) extraction and act on the anti-of hydraulic pump
Feed voltage power oil circuit LS and oil return circuit Ti (i is the integer more than or equal to 1), wherein：
The load-sensitive duty valve is the load-sensitive duty valve 100 in the various embodiments described above, is connected on feedback pressure
Between oil circuit LS and oil return circuit Ti, also, the feedback hydraulic fluid port LS and load sensing multi-way valve 200 of load-sensitive duty valve 100
Feedback pressure oil communication, the oil return inlet T of load-sensitive duty valve 100 and the oil return circuit of load sensing multi-way valve 200 connect
Logical, (i is the pilot control hydraulic fluid port Pi of the load-sensitive duty valve 100 and guide's oil circuit Pi that respectively joins in load sensing multi-way valve 200
Integer more than or equal to 1) connection.
On the one hand, the present invention sets load-sensitive duty valve 100 to replace existing skill using in load sensing multi-way valve 200
The technical scheme of restriction is set in art, and method of the flow by that could produce pressure difference must be had using throttle orifice by having abandoned,
Use ratio valve 2 directly blocks the discharge channel 11 between feedback oilhole 5 and oil return inlet T, because loop is closing, therefore bears
Carrying the LS feedback pressures in sensitive function valve 100, to set up speed very fast, during low-load is switched fast to high capacity
It is rapid set up feedback pressure controlling pump output system needed for flow and pressure, eliminate because LS pressure set up it is slow and caused by hold
Row mechanism action waits phenomenon, improves operating efficiency.
On the other hand, the present invention sets load-sensitive duty valve to replace in the prior art using in load sensing multi-way valve
The technical scheme of restriction is set, the side of the LS feedback channel pressure using throttle orifice removal load sensing multi-way valve has been abandoned
Method, discharge channel 11 is connected between use ratio valve feedback oilhole 5 and oil return inlet T, because loop is unimpeded, therefore is loaded quick
The LS feedback pressure removal speed felt in duty valve 100 is very fast, rapid during high capacity is switched fast to low-load
Feedback pressure oil circuit pressure is down to low-load from high capacity, it is ensured that the authenticity of the LS pressure fed back on pump, it is to avoid because
The too high pressure for causing pump to export of LS feedback pressures and flow and the mismatch of low-load actuator demand, so as to improve complete machine
Operating characteristics and operating efficiency.
The present invention also provides a kind of load-sensitive hydraulic system, and it at least includes the load-sensitive work(in the various embodiments described above
Energy threshold 100, the other parts of the load-sensitive hydraulic system are prior art, be will not be repeated here.
The present invention also provides a kind of mini-excavator, and it at least includes the load-sensitive duty valve in the various embodiments described above
100.The other parts of the mini-excavator are prior art, be will not be repeated here.
Finally it should be noted that:The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
The embodiment of the present invention can be modified or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical scheme, it all should cover among claimed technical scheme scope of the invention.
Claims (17)
1. a kind of load-sensitive duty valve, it is characterised in that：At least include with pilot control hydraulic fluid port (Pi), oil return opening (T) and
Feed back in the valve body (1) of hydraulic fluid port (LS), the valve body (1) at least provided with proportioning valve (2) and check valve (3)；The proportioning valve (2)
Second chamber (23) with first chamber (21) and with spring (22)；The first chamber (21) is while oily with the feedback
Mouth (LS), the pilot control hydraulic fluid port (Pi) are connected with the oil inlet of the check valve (3)；The oil inlet of the proportioning valve (2)
Connected simultaneously with the oil-out and the second chamber (23) of the check valve (3), oil-out is connected with the oil return opening (T).
2. load-sensitive duty valve as claimed in claim 1, it is characterised in that：The valve body (1) at least provided with it is described
The feedback oil duct (4) that feedback hydraulic fluid port (LS) is connected.
3. load-sensitive duty valve as claimed in claim 2, it is characterised in that：The hydraulic fluid port (LS) that feeds back is towards the valve body
(1) internal extension forms the feedback oilhole (5) connected with the feedback oil duct (4).
4. load-sensitive duty valve as claimed in claim 3, it is characterised in that：The feedback oilhole (5) is stepped hole, at least
Including housing the check valve (3) and with feedback oil duct (4) aperture (51) that directly connects and housing for described
The macropore (52) of the first screw plug (6) of the stroke limit of check valve (3).
5. load-sensitive duty valve as claimed in claim 4, it is characterised in that：First screw plug (6) and the check valve
(3) end face being in contact digs the groove being adapted with the steel ball in the check valve (3).
6. load-sensitive duty valve as claimed in claim 4, it is characterised in that：In being offered in the middle part of first screw plug (6)
The through hole of hexagonal structure.
7. load-sensitive duty valve as claimed in claim 4, it is characterised in that：First screw plug (6) and the macropore
(52) inner thread connection.
8. the load-sensitive duty valve as any one of claim 4 to 7, it is characterised in that：The proportioning valve (2) is at least
Also include valve element (24), the pilot control hydraulic fluid port (Pi) forms towards extension inside the valve body (1) and houses the spring (22)
With the clear opening (7) of the valve element (24)；The valve element (24) is moved by compressing the spring (22) along the clear opening (7)
It is dynamic, so that the oil return opening (T) is connected or ended with feedback oilhole (5).
9. load-sensitive duty valve as claimed in claim 8, it is characterised in that：The pilot control hydraulic fluid port (Pi) and the valve
It is additionally provided with clear opening (7) between core (24) for the second screw plug (8) to the stroke limit of the valve element (24), this
The clear opening (7) the formation first chamber (21) where two screw plugs (8), the clear opening where the spring (22)
(7) second chamber (23) is formed.
10. load-sensitive duty valve as claimed in claim 9, it is characterised in that：In being offered in the middle part of second screw plug (8)
The through hole of hexagonal structure.
11. load-sensitive duty valve as claimed in claim 9, it is characterised in that：Second screw plug (8) and the clear opening
(7) inner thread connection.
12. load-sensitive duty valve as claimed in claim 9, it is characterised in that：Connection institute is additionally provided with the valve body (1)
State the first oil duct (9) of first chamber (21) and the macropore (52).
13. load-sensitive duty valve as claimed in claim 9, it is characterised in that：Connection institute is additionally provided with the valve body (1)
State second chamber (23) and the second oil duct (10) of the feedback oil duct (4).
14. load-sensitive duty valve as claimed in claim 8, it is characterised in that：The oil return opening (T) is towards the valve body (1)
Inside extension, through the clear opening (7) and is communicated to the aperture (51), forms the 3rd oil duct (11).
15. a kind of load sensing multi-way valve, at least including first and the load-sensitive duty valve of the first is arranged on；It is special
Levy and be：The load-sensitive duty valve is the load-sensitive duty valve as any one of claim 1 to 14, described negative
The feedback hydraulic fluid port (LS) of sensitive function valve and the feedback pressure oil communication of the banked direction control valves are carried, the load-sensitive duty valve
Oil return opening (T) is connected with the oil return circuit of the banked direction control valves, the pilot control hydraulic fluid port (Pi) of the load-sensitive duty valve and institute
State the guide's oil circuit connection respectively joined in banked direction control valves.
16. a kind of load-sensitive hydraulic system, it is characterised in that：At least include as any one of claim 1 to 14
Load-sensitive duty valve.
17. a kind of mini-excavator, it is characterised in that：The load at least included as any one of claim 1 to 14 is quick
Feel duty valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410588415.5A CN105545850B (en) | 2014-10-28 | 2014-10-28 | A kind of load-sensitive duty valve and its banked direction control valves, hydraulic system, mini-excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410588415.5A CN105545850B (en) | 2014-10-28 | 2014-10-28 | A kind of load-sensitive duty valve and its banked direction control valves, hydraulic system, mini-excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105545850A CN105545850A (en) | 2016-05-04 |
| CN105545850B true CN105545850B (en) | 2017-09-08 |
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| CN201410588415.5A Active CN105545850B (en) | 2014-10-28 | 2014-10-28 | A kind of load-sensitive duty valve and its banked direction control valves, hydraulic system, mini-excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108194441B (en) * | 2017-12-28 | 2024-02-02 | 江苏徐工工程机械研究院有限公司 | Multi-way valve tail connection and electro-hydraulic proportional multi-way valve |
| CN108895050B (en) * | 2018-09-12 | 2020-10-09 | 徐州徐工液压件有限公司 | Novel structure of feedback oil circuit of load sensitive valve |
| US10808733B2 (en) * | 2019-03-05 | 2020-10-20 | Deere & Company | Open center to open center load sense conversion valve and hydraulic systems therewith |
| CN112962710B (en) * | 2021-02-20 | 2023-02-03 | 三一重机有限公司 | Hydraulic system of excavator, excavator and power sharing machine group |
| US11771183B2 (en) | 2021-12-16 | 2023-10-03 | Joon Bu Park | Negative Poisson's ratio materials for fasteners |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3844400C2 (en) * | 1988-12-30 | 1993-12-02 | Rexroth Mannesmann Gmbh | Valve arrangement for a hydraulic system |
| JP3447094B2 (en) * | 1993-12-28 | 2003-09-16 | カヤバ工業株式会社 | Load sensing circuit |
| DE102006060333B3 (en) * | 2006-12-20 | 2008-08-21 | Sauer-Danfoss Aps | Hydraulic valve arrangement |
| CN201843848U (en) * | 2010-11-11 | 2011-05-25 | 徐州重型机械有限公司 | Pressure-compensated valve, load sensitive hydraulic system and crane using pressure-compensated valve |
| CN103047208B (en) * | 2012-12-27 | 2015-02-18 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Load-sensitive electro-hydraulic proportional multi-way valve |
| CN103174697B (en) * | 2013-03-22 | 2015-04-15 | 江苏恒立高压油缸股份有限公司 | Hydraulic valve system with pressure compensation function |
| CN203835840U (en) * | 2014-04-16 | 2014-09-17 | 徐工集团工程机械股份有限公司 | Plate type load-sensitive multi-tandem valve tail link |
| CN204164076U (en) * | 2014-10-28 | 2015-02-18 | 徐工集团工程机械股份有限公司 | A kind of load-sensitive duty valve and multi-way valve, hydraulic system, mini-excavator |
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