CN102465935A - Pressure-compensated valve, load-sensitive hydraulic system and crane applying same - Google Patents
Pressure-compensated valve, load-sensitive hydraulic system and crane applying same Download PDFInfo
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- CN102465935A CN102465935A CN201010540119XA CN201010540119A CN102465935A CN 102465935 A CN102465935 A CN 102465935A CN 201010540119X A CN201010540119X A CN 201010540119XA CN 201010540119 A CN201010540119 A CN 201010540119A CN 102465935 A CN102465935 A CN 102465935A
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Abstract
The invention discloses a pressure-compensated valve, comprising a valve body and a valve core arranged inside the valve body, wherein the valve core slides in the valve body so as to communicate or disconnect an oil inlet and an oil outlet of the valve body; four relatively closed cavities are formed between the valve core and the valve body, a first control oil inlet, a second control oil inlet, a first control oil outlet and a second control oil outlet, which are communicated with each cavity, are arranged in the valve body; and oil in the cavities communicated with the first control oil inlet and the first control oil outlet acts on the valve core to form a trend of sliding towards one side, and oil in the cavities communicated with the second control oil inlet and the second control oil outlet acts on the valve core to form a trend of sliding towards the other side. On the basis, the invention further provides a load-sensitive hydraulic system and a crane applying the pressure-compensated valve so as to adjust the flow of executive components and ensure the proportional flow distribution of each executive component during flow saturation.
Description
Technical field
The present invention relates to the engineering machinery technology, particularly a kind of pressure-compensated valve and use load-sensitive hydraulic system, the hoist of this valve.
Background technique
The load-sensitive technology is used comparatively extensive on various construction planies; Main cause is that it has good energy-conservation property; Oil hydraulic pump can provide corresponding flow according to system requirements, and the required flow of system does not receive the influence of induced pressure, and when main valve during at meta; Can realize low pressurized overflow, thereby reduce the power loss of system.
At present, along with the quickening of social development rhythm, not only be confined to basic service behaviours such as energy-conservation, safe and reliable for the requirement of construction plant.How to improve operating efficiency and become the main points of optimal design, particularly, rationally carry out the design of composite move.
With the crane is example, elemental motions such as it has, and complete machine walking, the revolution of getting on the bus, shear leg are flexible, shear leg luffing and hook lifting.For adapting to the needs of actual conditions, the compound of aforementioned elemental motion can be improved the operating efficiency of hoist effectively, thereby shortened the operating time greatly, satisfies the requirement of different user.Since the working principle of composite move be by a pump give simultaneously two loads (such as, hoist motor and luffing oil hydraulic cylinder) high pressure oil is provided, therefore, need be under the certain prerequisite of hydraulic oil total discharge, by the demand of executive component fluid is offered each load.
Yet; In use there is certain defective in conventional load sensory system (LS system) for realizing composite move, for example; When system will realize that a plurality of executive components move simultaneously; If the peak rate of flow that oil hydraulic pump is supplied with is less than the required total discharge of system, then load sensitive system will lose its load-sensitive function, can't realize the distribution according to need of saturation volume.Although existing technology is for overcoming above-mentioned defective, subsequent development the load sensitive system of LUDV hydraulic system and integrated AVR function; Yet also there is deficiency separately in such scheme: the former element price is very expensive, has improved the manufacture cost of hoist greatly; The latter's assignment of traffic is not carried out in proportion, thus can not satisfy some SORs of crane hydraulic system fully, such as, performances such as the energy saving of crane hydraulic system, fine motion property and composite move.
In view of this, demand urgently being optimized design,, effectively control manufacture cost, thereby greatly improve the complete machine performance of hoist with on the basis of reliable realization saturation volume pro-rata to existing load sensitive system.
Summary of the invention
To above-mentioned defective, the technical problem that the present invention solves is, a kind of pressure-compensated valve is provided, and to regulate the flow of executive component, guarantees that the full fashionable flow proportional of each executive component of can realizing of flow distributes.On this basis, the present invention also provides a kind of load-sensitive hydraulic system and hoist of this pressure-compensated valve of application.
Pressure-compensated valve provided by the invention comprises valve body and is built in the spool in the said valve body, and said spool slides in said valve body and perhaps breaks off its filler opening and oil outlet to be communicated with; Form the cavity volume of four relative closures between said spool and the said valve body, and said valve body is provided with the first control oil inlet, the second control oil inlet, the first control oil export and the second control oil export that is communicated with each cavity volume; And the cavity volume inner fluid that is communicated with the said first control oil inlet and the first control oil export acts on said spool and forms the trend of breakking away and moving to one, and the cavity volume inner fluid that is communicated with the said second control oil inlet and the second control oil export acts on said spool and forms the trend of sliding to opposite side.
Preferably, between said spool and valve body, be provided with elastic member, said elastic member is along with the axial displacement of said spool is stretched or retraction.
Preferably, the said first control oil export is communicated with said oil outlet.
Load-sensitive hydraulic system provided by the invention comprises that oil hydraulic pump, at least two have the control main valve of three working positions, left, center, right, at least two foregoing pressure-compensated valves, one first reduction valve and at least two second reduction valve; Wherein, when each said control main valve is in position, a left side or right position, the conducting of one of its filler opening and two oil outlets, and two load feedback hydraulic fluid ports of each said control main valve are communicated with the Variable Control mechanism sensitive cavity of said oil hydraulic pump respectively; Each pressure-compensated valve relative set is between each control main valve and oil hydraulic pump; And the first control oil export of said pressure-compensated valve is communicated with the filler opening of said control main valve, and the second control oil export of said pressure-compensated valve is communicated with respectively with two load feedback hydraulic fluid ports of said control main valve; Said first reduction valve is arranged on the path between the first control oil inlet of liquid outlet and two said pressure-compensated valves of said oil hydraulic pump at least; Said at least two second reduction valve are separately positioned on the path between the second control oil inlet of liquid outlet and each said pressure-compensated valve of said oil hydraulic pump.
Preferably, said first reduction valve and second reduction valve are electric proportional pressure-reducing valve.
Preferably, comprise that also the output control signal regulates the controller of the set pressure of said first reduction valve and second reduction valve.
Preferably, also comprise first pressure transducer and second pressure transducer; Wherein, said first pressure transducer obtains the inlet hydraulic of the Variable Control mechanism sensitive cavity of said oil hydraulic pump, and exports first pressure signal to said controller; Said second pressure transducer obtains the hydraulic coupling that of said oil hydraulic pump, and exports second pressure signal to said controller; And the Joystick of said control main valve output handle electrical signal is to said controller; Said controller is exported said control signal according to said first pressure signal, second pressure signal and handle electrical signal.
Preferably, said controller is according to each executive component priority output control signal corresponding of preset mode of operation.
Hoist provided by the invention comprises the hydraulic system of controlling a plurality of executive component composite moves, and said hydraulic system adopts foregoing load-sensitive hydraulic system.
Compared with prior art; The invention provides a kind of can with the pressure-compensated valve of control main valve fit adjustment executive component flow; This valve has two control oil inlets and two control oil exports; Wherein, control the side that cavity volume inner fluid that oily inlet/outlet is communicated with acts on spool with one group, the cavity volume inner fluid that is communicated with the oily inlet/outlet of another group control acts on the opposite side of spool.Like this, under the differential pressure action of two control oil inlets, spool remains on definite working position; At this moment, two pressure reduction of controlling between the oil export are definite equally.
For each control main valve, the first control oil export of relevant pressure recuperation valve is communicated with the filler opening of control main valve, and its second control oil export is communicated with respectively with two load feedback hydraulic fluid ports of control main valve.In the composite move control procedure; Can be poor through the pressure at two ends of pilot pressure recuperation valve spool; And then regulate the pressure reduction after and before the valve of corresponding control main valve, thereby when occurring that flow is full to close phenomenon, can carry out reliable flow proportional control simultaneously to each executive component.
Load-sensitive hydraulic system provided by the invention; Adopt the reduction valve adjusting to input to the oil liquid pressures of two control oil inlets of pressure-compensated valve; Make its spool remain on definite working position,, have reliable characteristics reasonable in design to adjust two pressure reduction between the control oil export.
Reduction valve in the preferred version of the present invention adopts electric proportional pressure-reducing valve; And then can send the setting that guide's control signal is adjusted each reduction valve according to the flow system flow situation through controller; To adapt to the flow of the corresponding control main valve of different working mode adjustment, satisfy the actual demand of concrete operating mode.Therefore, can carry out a step and improve crane hydraulic system energy saving, fine motion property and composite move performance, greatly improve the complete machine performance of hoist, have better operability.
Pressure-compensated valve provided by the invention is applicable to the composite move load-sensitive hydraulic system of any engineering machinery, is specially adapted to hoist.
Description of drawings
Fig. 1 is the overall structure schematic representation of hoist described in the embodiment;
Fig. 2 is the fundamental diagram of pressure-compensated valve described in the embodiment;
Fig. 3 is the fundamental diagram of the load-sensitive hydraulic system of hoist described in the embodiment.
Among the figure:
Oil hydraulic pump 10, pressure-compensated valve 20, filler opening 21, oil outlet 22, the first control oil inlet 23, the second control oil inlet 24, the first control oil export 25, the second control oil export 26, control main valve 30, first reduction valve 40, second reduction valve 50, first pressure transducer 60, second pressure transducer 70, controller 80.
Embodiment
Core of the present invention provides a kind of pressure-compensated valve, to regulate the flow of executive component, guarantees that the full fashionable flow proportional of each executive component of can realizing of flow distributes.Specify this mode of execution below in conjunction with Figure of description.
Be without loss of generality, this paper is that example sees explanation for details with the hoist.
See also Fig. 1, this figure is the overall structure schematic representation of the said hoist of this mode of execution.
This hoist has main function components such as chassis system, crane system, hoisting system, power system and control system, and elemental motions such as complete machine walking, the revolution of getting on the bus, shear leg are flexible, shear leg luffing and hook lifting can composite move.Need to prove that the self structure of aforementioned each functional part and working principle are identical with existing technology, those skilled in the art can realize based on existing technology fully, so this paper repeats no more.
Compared with prior art, the main distinction of this programme point is employed pressure-compensated valve in this hoist load sensitive system.Please, the figure shows the principle schematic of this pressure-compensated valve in the lump referring to Fig. 2; Certainly, can realize having the pressure-compensated valve of corresponding function based on this schematic diagram, be the structural representation that this valve is provided for saving map sheet this paper.
This pressure-compensated valve 20 comprises valve body and is built in the spool (not specifically illustrating in the schematic diagram) in the valve body that spool slides and perhaps breaks off its filler opening 21 and oil outlet 22 to be communicated with in valve body; That is, this valve has two working positions, and is as shown in the figure, and under the state of position, a left side, its filler opening 21 is communicated with oil outlet 22, and under the state of right position, its filler opening 21 breaks off with oil outlet 22.Certainly, the on state of a left side, position also can oppositely be provided with, and is not limited to shown in the figure.
In addition, also be provided with four hydraulic fluid ports on this valve body: the first control oil inlet 23, the second control oil inlet 24, the first control oil export 25 and the second control oil export 26, respectively with spool and valve body between form four relative closures cavity volume be communicated with.Wherein, The cavity volume inner fluid that is communicated with the first control oil inlet 23 and the first control oil export 25 acts on spool and forms the trend of breakking away and moving to one, and the cavity volume inner fluid that is communicated with the second control oil inlet 24 and the second control oil export 26 acts on spool and forms the trend of sliding to opposite side.That is to say that wherein, control the side that cavity volume inner fluid that oily inlet/outlet is communicated with acts on spool with one group, the cavity volume inner fluid that is communicated with the oily inlet/outlet of another group control acts on the opposite side of spool.Obviously, under the differential pressure action of two control oil inlets, spool remains on definite working position; At this moment, two pressure reduction of controlling between the oil export are definite equally.So design can be through the pressure reduction between two control of the pressure reduction adjustment oil export of regulating two control oil inlets.
Certainly, spool and between be provided with elastic member so that elastic member stretches or retraction along with the axial displacement of said spool, thereby the reset response power of spool is provided.
In addition, preferably, the first control oil export 25 is communicated with oil outlet 22, with the pressure oil circuit in the downstream side of pilot pressure recuperation valve.In fact, the first control oil export 25 is realized with the mode that the connected relation of oil outlet 22 can adopt valve to be communicated with outward, also can adopt the realization of the mode that is communicated with in the valve, as long as satisfy the use needs all in the scope that the application asks for protection.
See also Fig. 3, this figure is the fundamental diagram of hoist with the load-sensitive hydraulic system.
This load-sensitive hydraulic system adopts foregoing pressure-compensated valve 20.
Identical with existing load-sensitive hydraulic system is, this system comprises oil hydraulic pump 10, two control main valves 30 with three working positions, left, center, right; Wherein, When each control main valve 30 was in left side position or right position, the perhaps second oil outlet B conducting of its oil inlet P and the first oil outlet A was to set up being communicated with between system pressure oil circuit and the corresponding executive component actuator port; Such as; Two chambeies of telescopic boom cylinder, two actuator ports of the rotary motor of perhaps getting on the bus, perhaps two actuator ports of hoist motor etc.Equally, first load feedback hydraulic fluid port C1 of each control main valve 30 and second reverse feedback oil C2 are communicated with the Variable Control mechanism sensitive cavity of oil hydraulic pump 10 respectively, promptly are communicated with the X mouth of oil hydraulic pump 10; Its pressure parameter is changed; According to system requirements corresponding flow is provided, the required flow of system does not receive the influence of induced pressure, and when main valve during at meta; Can realize low pressurized overflow, thereby reduce the power loss of system.
Corresponding with two control main valves 30 two foregoing pressure-compensated valves 20 are set; Wherein, Each pressure-compensated valve 20 relative set is between each control main valve 30 and oil hydraulic pump 10, and promptly the filler opening 21 of pressure-compensated valve 20 is communicated with the system pressure oil circuit, oil outlet 22 is communicated with the oil inlet P of controlling main valve 30; And the first control oil export 25 of pressure-compensated valve 20 is communicated with the oil inlet P of control main valve 30, and the second control oil export 26 of pressure-compensated valve 20 is communicated with respectively with first load feedback hydraulic fluid port C1 of control main valve 30 and second reverse feedback oil C2.
In this programme, first reduction valve 40 and second reduction valve 50 are electric proportional pressure-reducing valve, so that regulate its set pressure according to control signal.
Need to prove especially, regulate, can adopt the mode of operator's manual control for the reduction valve set pressure.Certainly, also can control automatically according to the real-time parameter of system.Particularly, this programme can also pass through first pressure transducer 60 and second pressure transducer 70; Wherein, first pressure transducer 60 obtains the inlet hydraulic of the Variable Control mechanism sensitive cavity of oil hydraulic pump 10, and exports first pressure signal to controller 80; Second pressure transducer 70 obtains the hydraulic coupling that of oil hydraulic pump 10, and exports second pressure signal to controller 80.Simultaneously, the Joystick (not shown) output handle electrical signal of control main valve 30 is to controller 80; In the working procedure, controller 80 is according to first pressure signal, second pressure signal and handle electrical signal output control signal, to regulate first reduction valve 40 or corresponding second reduction valve 50.Particularly, can preset the setting of mode of operation according to actual vehicle, and the priority of each executive component under each mode of operation; Like this; Under selected mode of operation, controller 80 is according to first pressure signal that obtains in real time, second pressure signal and handle electrical signal output reduction valve to be transferred, thus the working flow of the several executive components of adjusting composite move certain or certain; When occurring that flow is full to close phenomenon, can realize that also the flow proportional of each executive component distributes.
Obviously, this paper only illustrates the embodiment of two executive component composite moves, the quantity and the corresponding one by one setting of executive component of aforementioned control main valve 30 and the pressure compensator 20 and second reduction valve 50.In fact, above-mentioned parts can be according to the quantity relative set of this working principle according to actual composite move element.
The following working principle of sketching aforementioned load-sensitive hydraulic system according to three kinds of main operating modes:
1, single executive component action
When single executive component moves; Do not have the flow saturated phenomenon, then controller is not exported control command, and first reduction valve 40, second reduction valve 50 all are in closed condition; Then the pressure differential deltap P of pressure compensator 20 is that (pressure reduction before and after the throttling main valve is certain value to certain value; Be Ft/A), at this moment, the flow that gets into executive component is only determined by the openings of sizes of control main valve 30.
2, a plurality of executive component composite move I
When a plurality of executive components carry out composite move; If the peak rate of flow that the aggregate demand flow can provide less than oil hydraulic pump; Then pressure compensator 20 need not be regulated its pressure differential deltap P, and under this operating mode, the movement velocity of each executive component is only determined by the openings of sizes of each throttling main valve.Certainly; Also can be through selecting operating mode; Make controller 80 send that control signal is regulated first reduction valve 40, second reduction valve 50 is opened; And regulate corresponding set pressure as required, with the pressure differential resetting value Δ P of pilot pressure compensator 20, thereby further the flow that gets into executive component is regulated.That is to say, can make the influence of not only controlled main valve 30 openings of sizes of flow that get into executive component, but also change, preferentially select the speed of some executive component with the change of pressure compensator 20 pressure differential deltap P values.
3, a plurality of executive component composite move II
When a plurality of executive components carry out composite move, if the aggregate demand flow surpasses the peak rate of flow that oil hydraulic pump can provide, the flow saturated phenomenon appears promptly; At this moment; The load-sensitive hydraulic system is confirmed above-mentioned state according to the signal that obtains in real time; Thereby start-up control device 80 removes to control the opening degree of first reduction valve 40, second reduction valve 50; And then regulate the pressure differential deltap P of pressure compensator 20, make flow the reducing in various degree that gets into corresponding executive component, thereby avoid occurring the flow saturated phenomenon.That is to say,, can realize getting into the flow pro-rata of each executive component, and then realize proportional control each executive component speed through changing the control electric current of electric proportional pressure-reducing valve.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (9)
1. pressure-compensated valve comprises valve body and is built in the spool in the said valve body, and said spool slides in said valve body, perhaps breaks off its filler opening and oil outlet to be communicated with; It is characterized in that, form the cavity volume of four relative closures between said spool and the said valve body, and said valve body is provided with the first control oil inlet, the second control oil inlet, the first control oil export and the second control oil export that is communicated with each cavity volume; And the cavity volume inner fluid that is communicated with the said first control oil inlet and the first control oil export acts on said spool and forms the trend of breakking away and moving to one, and the cavity volume inner fluid that is communicated with the said second control oil inlet and the second control oil export acts on said spool and forms the trend of sliding to opposite side.
2. pressure-compensated valve according to claim 1 is characterized in that, between said spool and valve body, is provided with elastic member, and said elastic member is along with the axial displacement of said spool is stretched or retraction.
3. pressure-compensated valve according to claim 1 is characterized in that, the said first control oil export is communicated with said oil outlet.
4. load-sensitive hydraulic system comprises:
Oil hydraulic pump; With
At least two control main valves with three working positions, left, center, right; When each control main valve is in position, a left side or right position; The conducting of one of its filler opening and two oil outlets, and two load feedback hydraulic fluid ports of each control main valve are communicated with the Variable Control mechanism sensitive cavity of said oil hydraulic pump respectively; It is characterized in that, also comprise:
At least two like each described pressure-compensated valve in the claim 1 to 3, and each pressure-compensated valve relative set is between each control main valve and oil hydraulic pump; And the first control oil export of said pressure-compensated valve is communicated with the filler opening of said control main valve, and the second control oil export of said pressure-compensated valve is communicated with respectively with two load feedback hydraulic fluid ports of said control main valve; With
One first reduction valve is arranged on the path between the first control oil inlet of liquid outlet and two said pressure-compensated valves of said oil hydraulic pump at least;
At least two second reduction valve are separately positioned on the path between the second control oil inlet of liquid outlet and each said pressure-compensated valve of said oil hydraulic pump.
5. load-sensitive hydraulic system according to claim 4 is characterized in that, said first reduction valve and second reduction valve are electric proportional pressure-reducing valve.
6. load-sensitive hydraulic system according to claim 5 is characterized in that, also comprises exporting the controller that control signal is regulated the set pressure of said first reduction valve and second reduction valve.
7. load-sensitive hydraulic system according to claim 6 is characterized in that, also comprises:
First pressure transducer, obtain said oil hydraulic pump Variable Control mechanism sensitive cavity inlet hydraulic and export first pressure signal to said controller; With
Second pressure transducer obtains going out hydraulic coupling and exporting second pressure signal to said controller of said oil hydraulic pump; And
The Joystick output handle electrical signal of said control main valve is to said controller; Said controller is exported said control signal according to said first pressure signal, second pressure signal and handle electrical signal.
8. load-sensitive hydraulic system according to claim 7 is characterized in that, said controller is according to each executive component priority output control signal corresponding of preset mode of operation.
9. hoist comprises the hydraulic system of controlling a plurality of executive component composite moves, it is characterized in that, said hydraulic system adopts like each described load-sensitive hydraulic system in the claim 4 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010540119.XA CN102465935B (en) | 2010-11-11 | 2010-11-11 | Pressure-compensated valve, load-sensitive hydraulic system and crane applying same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010540119.XA CN102465935B (en) | 2010-11-11 | 2010-11-11 | Pressure-compensated valve, load-sensitive hydraulic system and crane applying same |
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| CN102465935A true CN102465935A (en) | 2012-05-23 |
| CN102465935B CN102465935B (en) | 2014-12-10 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889258A (en) * | 2012-09-20 | 2013-01-23 | 三一重工股份有限公司 | Pressure compensation valve and engineering machinery |
| CN102996391A (en) * | 2012-12-03 | 2013-03-27 | 中联重科股份有限公司 | Load-sensitive pump, load-sensitive hydraulic system and concrete pumping device |
| CN106081914A (en) * | 2016-08-19 | 2016-11-09 | 徐州重型机械有限公司 | Load sensitive system, Ioad-sensing control method and crane |
| CN109058194A (en) * | 2018-10-11 | 2018-12-21 | 徐工集团工程机械有限公司 | The hydraulic control system and its control method and Work machine of job execution mechanism |
| CN109707688A (en) * | 2018-12-29 | 2019-05-03 | 中国煤炭科工集团太原研究院有限公司 | A kind of anti-full load sensing multi-way valve of the flow with precondition pressure compensator |
| CN110030220A (en) * | 2018-01-12 | 2019-07-19 | 伊顿智能动力有限公司 | Hydraulic valve with pressure restrictor function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102889258A (en) * | 2012-09-20 | 2013-01-23 | 三一重工股份有限公司 | Pressure compensation valve and engineering machinery |
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| CN102996391A (en) * | 2012-12-03 | 2013-03-27 | 中联重科股份有限公司 | Load-sensitive pump, load-sensitive hydraulic system and concrete pumping device |
| CN102996391B (en) * | 2012-12-03 | 2016-03-02 | 中联重科股份有限公司 | Load sensitive pump, load-sensitive hydraulic system and concrete pumping equipment |
| CN106081914A (en) * | 2016-08-19 | 2016-11-09 | 徐州重型机械有限公司 | Load sensitive system, Ioad-sensing control method and crane |
| CN110030220A (en) * | 2018-01-12 | 2019-07-19 | 伊顿智能动力有限公司 | Hydraulic valve with pressure restrictor function |
| CN109058194A (en) * | 2018-10-11 | 2018-12-21 | 徐工集团工程机械有限公司 | The hydraulic control system and its control method and Work machine of job execution mechanism |
| CN109707688A (en) * | 2018-12-29 | 2019-05-03 | 中国煤炭科工集团太原研究院有限公司 | A kind of anti-full load sensing multi-way valve of the flow with precondition pressure compensator |
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| CN102465935B (en) | 2014-12-10 |
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