CN102434507A - Engineering machinery and load sensitivity control system and control method thereof - Google Patents
Engineering machinery and load sensitivity control system and control method thereof Download PDFInfo
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- 230000035945 sensitivity Effects 0.000 title abstract description 5
- 230000007246 mechanism Effects 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 7
- 239000002828 fuel tank Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 230000000295 complement effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention provides engineering machinery and a load sensitivity control system and a control method thereof. A load sensitive control system for driving an actuator, the load sensitive control system comprising: the system comprises a load sensitive pump, a proportional valve with load feedback and a switching unit; when the feedback pressure received by the switching unit from the load feedback port of the proportional valve is smaller than a switching set value, the switching unit enables the output port of the load sensitive pump to be communicated with the load feedback port of the load sensitive pump. The switching unit compares the pressure value of the load feedback port of the load sensitive pump with a set value, and connects the output port of the load sensitive pump with the load feedback port when the pressure value is smaller than the set value, so that the remote sensitivity degree of the load sensitive system is improved, the action continuity of an actuating element and the stability of a hydraulic system are realized, the characteristics of the load sensitive system are maintained, and the characteristics of energy conservation and good regulation are realized.
Description
Technical field
The present invention relates to engineering machinery field, more specifically, relate to a kind of engineering machinery and load-sensitive control system thereof, controlling method.
Background technique
The load-sensitive control system is widely used in the engineering machinery because of its outstanding energy-conservation and control characteristic, and Fig. 1 shows the schematic diagram of load-sensitive control system of the prior art.
As shown in Figure 1, the load-sensitive control system is used for driving execution mechanism 5, and load-sensitive control system of the prior art comprises Proportional valve 4, the relief valve 2 of load sensitive pump 1, bringing onto load feedback; Wherein, load sensitive pump 1 comprises delivery outlet 11 and load feedback mouth 12; Proportional valve 4 comprises filler opening 41, return opening 42 and load feedback mouth 43; Actuator 5 is connected with Proportional valve 4; Relief valve 2 is arranged on the in-line of load feedback mouth 12 of load sensitive pump 1.Be delivered to the load feedback mouth 12 of load sensitive pump 1 through feedback pipe from the feedback pressure of the load feedback mouth 43 of Proportional valve 4; Because length, trend, the sealing degree of reliability, internal diameter and the parameters such as oil flow and oil viscosity of feedback pipe all can cause very big influence to the pressure signal transmission efficient and the performance of feedback oil circuit; This makes the force value of the actual feedback pressure value in load feedback mouth 12 places less than load feedback mouth 43 places of Proportional valve; In the occasion of the hydraulic actuator that uses the low load of the remote driving of hydraulic pressure, this phenomenon is especially serious especially.Therefore; Load-sensitive control system of the prior art exists that the pressure loss on the feedback pipe is big, the low problem of feedback efficiency of feedback signal; Thereby the underpressure that directly causes feeding back to load sensitive pump 1 place is to change the pivot angle of load sensitive pump 1; Cause the flow of load sensitive pump output can not satisfy the needed flow of Proportional valve, so that reduced the execution movement speed of the hydraulic actuator of low load very significantly, and then influenced the operating characteristics of hydraulic system.
Summary of the invention
The present invention aims to provide a kind of engineering machinery and load-sensitive control system thereof, controlling method; Load-sensitive control system with the solution existing technology is fashionable in the field of long-range fluid control, owing to the problem of the flow that feedback is big along the pressure loss on the road, the low flow that causes load sensitive pump to be exported of the feedback efficiency of feedback signal can not be satisfied the demand.
For solving the problems of the technologies described above, according to a first aspect of the invention, a kind of load-sensitive control system is provided, be used for driving execution mechanism, the load-sensitive control system comprises: load sensitive pump, load sensitive pump comprise delivery outlet and load feedback mouth; The Proportional valve of bringing onto load feedback, Proportional valve comprises filler opening, return opening and load feedback mouth; Actuator is connected with Proportional valve; Relief valve, the import of relief valve is communicated with the load feedback mouth of load sensitive pump, and the outlet of relief valve is connected with fuel tank; Switching unit; When switching unit receive from the feedback pressure of the load feedback mouth of Proportional valve when switching setting value, switching unit makes the load feedback mouth of Proportional valve be communicated with the load feedback mouth of load sensitive pump; When switching unit receive from the feedback pressure of the load feedback mouth of Proportional valve when switching setting value, switching unit makes the delivery outlet of load sensitive pump be communicated with the load feedback mouth of load sensitive pump.
Further, switching unit comprises pilot operated directional control valve, and pilot operated directional control valve comprises first station and second station; When first station, the load feedback mouth of Proportional valve is communicated with the load feedback mouth of load sensitive pump; When second station, the delivery outlet of load sensitive pump is communicated with the load feedback mouth of load sensitive pump.
Further, switch the difference of preset spring pressure of delivery pressure and switching unit that setting value is the equipped at outlet port of load sensitive pump.
Further, switching unit comprises solenoid valve, one-way valve and pressure detecting portion; The load feedback mouth of Proportional valve is connected with one-way valve through first pipeline, and one-way valve is connected with the load feedback mouth of load sensitive pump through second pipeline, and the delivery outlet of load sensitive pump is through the solenoid valve and second pipeline connection; Pressure detecting portion detects the pressure at the load feedback mouth place of load sensitive pump; Solenoid valve comprises first station and second station; When first station, the load feedback mouth of load sensitive pump is communicated with the load feedback mouth of Proportional valve; When second station, the load feedback mouth of load sensitive pump is communicated with the delivery outlet of load sensitive pump.
Further, switching unit also comprises orifice valve, and when second station, the delivery outlet of load sensitive pump is communicated with the load feedback mouth of load sensitive pump through orifice valve.
Further, the number of actuator is a plurality of, and relief valve is a proportional pressure control valve; When a plurality of actuators used separately respectively, the pressure of proportional pressure control valve was set at the corresponding value with the actuator of current use; When using simultaneously at least two in a plurality of actuators, the pressure of proportional pressure control valve is set at the maximum value in the corresponding value of using simultaneously of at least two actuators.
Further, load sensitive pump comprises the variable valve of the pivot angle that is used for the responsive pump of regulating load, and switching setting value is the preset spring pressure value of variable valve.
According to a second aspect of the invention; A kind of controlling method of load sensitive system is provided, and load sensitive system is used for driving execution mechanism, and load sensitive system comprises the Proportional valve of load sensitive pump and bringing onto load feedback; Wherein, load sensitive pump comprises delivery outlet and load feedback mouth; Proportional valve comprises filler opening, return opening and load feedback mouth; Actuator is connected with Proportional valve; Detect the feedback pressure from the load feedback mouth of Proportional valve at the load feedback mouth place of load sensitive pump; When feedback pressure when switching setting value, the load feedback mouth of Proportional valve is communicated with the load feedback mouth of load sensitive pump; When feedback pressure when switching setting value, the delivery outlet of load sensitive pump is communicated with the load feedback mouth of load sensitive pump.
Further, load sensitive pump comprises the variable valve of the pivot angle that is used for the responsive pump of regulating load, and switching setting value is the preset spring pressure value of variable valve.
According to a third aspect of the invention we, a kind of engineering machinery is provided, it comprises actuator and the load-sensitive control system that is used for driving execution mechanism, and this load-sensitive control system is above-mentioned load-sensitive control system.
The force value and the setting value of the load feedback mouth of switching unit responsive to load pump of the present invention compare; When this force value less than setting duration, the delivery outlet of load sensitive pump is connected with its load feedback mouth, thus the long-range sensitivity of raising load sensitive system; The continuity of executive component action and the stability of hydraulic system have been realized; Solve the difficult problem that existing technology exists, both kept the characteristic of load sensitive system, had characteristics energy-conservation, that control characteristic is good again.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 has schematically shown the schematic diagram of load-sensitive control system of the prior art;
Fig. 2 has schematically shown the schematic diagram of the load-sensitive control system in the one embodiment of the invention; And
Fig. 3 has schematically shown the schematic diagram of the load-sensitive control system in the another embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
As first aspect of the present invention, a kind of load-sensitive control system is provided.Like Fig. 2 and shown in Figure 3, the load-sensitive control system among the present invention is used for driving execution mechanism 5.The load-sensitive control system comprises Proportional valve 4, relief valve 2 and the switching unit 3 of load sensitive pump 1, bringing onto load feedback; Wherein, load sensitive pump 1 comprises delivery outlet 11 and load feedback mouth 12; Proportional valve 4 comprises filler opening 41, return opening 42 and load feedback mouth 43; Actuator 5 is connected with Proportional valve 4; The import of relief valve 2 is communicated with the load feedback mouth 12 of load sensitive pump 1, and the outlet of relief valve 2 is connected with fuel tank; When switching unit 3 receive from the feedback pressure of the load feedback mouth 43 of Proportional valve 4 when switching setting value, switching unit 3 makes the load feedback mouth 43 of Proportional valve 4 be communicated with the load feedback mouth 12 of load sensitive pump 1; When switching unit 3 receive from the feedback pressure of the load feedback mouth 43 of Proportional valve 4 when switching setting value, switching unit 3 makes the delivery outlet 11 of load sensitive pump 1 be communicated with the load feedback mouth 12 of load sensitive pump 1.Please combine Fig. 2 and Fig. 3; Load-sensitive control system among the present invention can be that relief valve is set different pressure according to different induced pressures; It is too small and when being not enough to change the pivot angle of load sensitive pump to feed back to the feedback pressure of load feedback mouth 43 of load sensitive pump at the load feedback pipeline; The pressure oil that the delivery outlet of load sensitive pump is exported feeds back to the load feedback mouth of load sensitive pump, thereby changes the pivot angle of load sensitive pump, and the output flow of load sensitive pump and the pairing actual flow demand of load feedback mouth of Proportional valve are complementary; Speed requirement and loading demand when having satisfied the executive component action; Make no matter how long the pipeline of load feedback has, how low induced pressure have, all can satisfy the needed flow of Proportional valve, realize accurate control the executive component movement speed.The present invention will be replaced by short-range signal conduction from the remote pressure conduction of the load feedback mouth of Proportional valve; Improve the long-range sensitivity of load sensitive system; The continuity of executive component action and the stability of hydraulic system have been realized; Solve the difficult problem that existing technology exists, both kept the characteristic of load sensitive system, had characteristics energy-conservation, that control characteristic is good again.Preferably, Proportional valve 4 is automatically controlled, hydraulic control or electrichydraulic control.
Preferably, in the embodiment shown in Figure 2, switching unit 3 comprises pilot operated directional control valve 31, and pilot operated directional control valve 31 comprises first station and second station; When first station (the for example right working position of the pilot operated directional control valve among Fig. 2 31), the load feedback mouth 43 of Proportional valve 4 is communicated with the load feedback mouth 12 of load sensitive pump 1; When second station (the for example left station of the pilot operated directional control valve among Fig. 2 31), the delivery outlet 11 of load sensitive pump 1 is communicated with the load feedback mouth 12 of load sensitive pump 1.In the present embodiment, preferably, switch setting value and can be the difference of preset spring pressure of delivery pressure and switching unit 3 at delivery outlet 11 places of load sensitive pump 1.
Preferably; In another embodiment shown in Figure 3; Switching unit 3 comprises solenoid valve 32, one-way valve 35 and pressure detecting portion 33; The load feedback mouth 43 of Proportional valve 4 is connected with one-way valve 35 through first pipeline, and one-way valve 35 is connected with the load feedback mouth 12 of load sensitive pump 1 through second pipeline, and the delivery outlet 11 of load sensitive pump 1 is through the solenoid valve 32 and second pipeline connection; Pressure detecting portion 33 detects the pressure at load feedback mouth 12 places of load sensitive pump 1; Solenoid valve 32 comprises first station and second station; When first station (the last station of solenoid valve 32 as shown in Figure 3), the load feedback mouth 12 of load sensitive pump 1 is communicated with the load feedback mouth 43 of Proportional valve 4; When second station (the following station of solenoid valve 32 as shown in Figure 3), the load feedback mouth 12 of load sensitive pump 1 is communicated with the delivery outlet 11 of load sensitive pump 1.Switching unit 3 also comprises orifice valve 34, and when second station, the delivery outlet 11 of load sensitive pump 1 is communicated with the load feedback mouth 12 of load sensitive pump 1 through orifice valve 34.Owing to be provided with orifice valve 34, thereby limited the flow of the load feedback mouth 12 that flows to load sensitive pump 1, thereby can prevent to damage the problem of load feedback mouth 12 owing to flow is excessive.Preferably, pressure detecting portion 33 is pressure transducers.Preferably, in the present embodiment, switch setting value and can be according to the specific and special settings of the load of different actuators, it be adjustable promptly switching setting value.When one-way valve 35 was used to make solenoid valve 32 to be operated in second station, the pressure oil of the delivery outlet 11 of load sensitive pump 1 can not flow to the load feedback mouth 43 of Proportional valve 4.Preferably, load sensitive pump 1 comprises the variable valve of the pivot angle that is used to regulate said load sensitive pump 1, and switching setting value is the preset spring pressure value of variable valve.
Like Fig. 2 and shown in Figure 3, the number of actuator 5 is a plurality of, and relief valve 2 is proportional pressure control valves; Owing to adopted proportional pressure control valve, therefore the pressure set points of relief valve can rationally be set to the use condition of actuator.For example; When a plurality of actuators 5 used separately respectively, actuator's 5 corresponding values that the pressure of proportional pressure control valve is set at current use (for example, had two actuators to use simultaneously; Proportional pressure control valve is respectively first setting value and second setting value with respect to the corresponding setting value of these two actuators; Wherein, first setting value is greater than second setting value, and then the setting value of proportional pressure control valve is got first setting value); When using simultaneously at least two in a plurality of actuators 5, the pressure of proportional pressure control valve be set at current at least two actuators 5 corresponding values of using simultaneously in maximum value.
As second aspect of the present invention, a kind of controlling method of load sensitive system is provided.In conjunction with Fig. 2 and shown in Figure 3, load sensitive system is used for driving execution mechanism 5, and load sensitive system comprises the Proportional valve 4 of load sensitive pump 1 and bringing onto load feedback, and wherein, load sensitive pump 1 comprises delivery outlet 11 and load feedback mouth 12; Proportional valve 4 comprises filler opening 41, return opening 42 and load feedback mouth 43; Actuator 5 is connected with Proportional valve 4; Detect the feedback pressure from the load feedback mouth 43 of Proportional valve 4 at load feedback mouth 12 places of load sensitive pump 1; When feedback pressure when switching setting value, the load feedback mouth 43 of Proportional valve 4 is communicated with the load feedback mouth 12 of load sensitive pump 1; When feedback pressure when switching setting value, the delivery outlet 11 of load sensitive pump 1 is communicated with the load feedback mouth 12 of load sensitive pump 1.Preferably, load sensitive pump 1 comprises the variable valve of the pivot angle that is used for the responsive pump 1 of regulating load, and switching setting value is the preset spring pressure value of variable valve; Perhaps, switch the difference of preset spring pressure of delivery pressure and switching unit 3 that setting value is delivery outlet 11 places of load sensitive pump 1.
As the third aspect of the invention, the invention provides a kind of engineering machinery, it comprises actuator and the load-sensitive control system that is used for driving execution mechanism, this load-sensitive control system is the load-sensitive control system among above-mentioned each embodiment.Preferably, engineering machinery is hoist or shield machine.
The invention provides a kind of hydraulic pressure conduction type telecontrol load-sensitive hydraulic system, be fit to the workplace that power oil sources and actuator or load feedback Proportional valve distance is long especially, line arrangement is complicated, load variations is frequent.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a load-sensitive control system is used for driving execution mechanism (5), it is characterized in that, said load-sensitive control system comprises:
Load sensitive pump (1), said load sensitive pump (1) comprise delivery outlet (11) and load feedback mouth (12);
The Proportional valve (4) of bringing onto load feedback, said Proportional valve (4) comprises filler opening (41), return opening (42) and load feedback mouth (43); Said actuator (5) is connected with said Proportional valve (4);
Relief valve (2), the import of said relief valve (2) is communicated with the load feedback mouth (12) of said load sensitive pump (1), and the outlet of said relief valve (2) is connected with fuel tank;
Switching unit (3);
When said switching unit (3) receive from the feedback pressure of the load feedback mouth (43) of said Proportional valve (4) when switching setting value, said switching unit (3) makes the load feedback mouth (43) of said Proportional valve (4) be communicated with the load feedback mouth (12) of said load sensitive pump (1);
When said switching unit (3) receive from the feedback pressure of the load feedback mouth (43) of said Proportional valve (4) during less than said switching setting value, said switching unit (3) makes the delivery outlet (11) of said load sensitive pump (1) be communicated with the load feedback mouth (12) of said load sensitive pump (1).
2. load-sensitive control system according to claim 1 is characterized in that, said switching unit (3) comprises pilot operated directional control valve (31), and said pilot operated directional control valve (31) comprises first station and second station;
When said first station, the load feedback mouth (43) of said Proportional valve (4) is communicated with the load feedback mouth (12) of said load sensitive pump (1);
When said second station, the delivery outlet (11) of said load sensitive pump (1) is communicated with the load feedback mouth (12) of said load sensitive pump (1).
3. load-sensitive control system according to claim 2 is characterized in that, the difference of the delivery pressure that the delivery outlet (11) that said switching setting value is said load sensitive pump (1) is located and the preset spring pressure of said switching unit (3).
4. load-sensitive control system according to claim 1 is characterized in that, said switching unit (3) comprises solenoid valve (32), one-way valve (35) and pressure detecting portion (33);
The load feedback mouth (43) of said Proportional valve (4) is connected with said one-way valve (35) through first pipeline; Said one-way valve (35) is connected with the load feedback mouth (12) of said load sensitive pump (1) through second pipeline, and the delivery outlet (11) of said load sensitive pump (1) is through said solenoid valve (32) and said second pipeline connection; Said pressure detecting portion (33) detects the pressure that the load feedback mouth (12) of said load sensitive pump (1) is located;
Said solenoid valve (32) comprises first station and second station;
When said first station, the load feedback mouth (12) of said load sensitive pump (1) is communicated with the load feedback mouth (43) of said Proportional valve (4);
When said second station, the load feedback mouth (12) of said load sensitive pump (1) is communicated with the delivery outlet (11) of said load sensitive pump (1).
5. load-sensitive control system according to claim 4; It is characterized in that; Said switching unit (3) also comprises orifice valve (34); When said second station, the delivery outlet (11) of said load sensitive pump (1) is communicated with the load feedback mouth (12) of said load sensitive pump (1) through said orifice valve (34).
6. load-sensitive control system according to claim 4 is characterized in that, the number of said actuator (5) is a plurality of, and said relief valve (2) is a proportional pressure control valve;
When a plurality of said actuators (5) used separately respectively, the pressure of said proportional pressure control valve was set at the corresponding value of said actuator (5) with current use;
When using simultaneously at least two in a plurality of said actuators (5), the pressure of said proportional pressure control valve is set at the maximum value in the said corresponding value of using simultaneously of at least two actuators (5).
7. load-sensitive control system according to claim 4 is characterized in that, said load sensitive pump (1) comprises the variable valve of the pivot angle that is used to regulate said load sensitive pump (1), and said switching setting value is the preset spring pressure value of said variable valve.
8. the controlling method of a load sensitive system; Said load sensitive system is used for driving execution mechanism (5); Said load sensitive system comprises the Proportional valve (4) of load sensitive pump (1) and bringing onto load feedback, and wherein, said load sensitive pump (1) comprises delivery outlet (11) and load feedback mouth (12); Said Proportional valve (4) comprises filler opening (41), return opening (42) and load feedback mouth (43); Said actuator (5) is connected with said Proportional valve (4);
It is characterized in that said method comprises:
The feedback pressure that detects that the load feedback mouth (12) of said load sensitive pump (1) locates from the load feedback mouth (43) of said Proportional valve (4);
When said feedback pressure when switching setting value, the load feedback mouth (43) of said Proportional valve (4) is communicated with the load feedback mouth (12) of said load sensitive pump (1);
When said feedback pressure during, the delivery outlet (11) of said load sensitive pump (1) is communicated with the load feedback mouth (12) of said load sensitive pump (1) less than said switching setting value.
9. controlling method according to claim 8 is characterized in that, said load sensitive pump (1) comprises the variable valve of the pivot angle that is used to regulate said load sensitive pump (1), and said switching setting value is the preset spring pressure value of said variable valve.
10. engineering machinery, it comprises actuator and the load-sensitive control system that is used to drive said actuator, it is characterized in that said load-sensitive control system is each described load-sensitive control system among the claim 1-7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110358060.7A CN102434507B (en) | 2011-11-11 | 2011-11-11 | Engineering machinery and load sensitivity control system and control method thereof |
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| CN201110358060.7A CN102434507B (en) | 2011-11-11 | 2011-11-11 | Engineering machinery and load sensitivity control system and control method thereof |
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Cited By (5)
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| WO2014000386A1 (en) * | 2012-06-26 | 2014-01-03 | 中联重科股份有限公司 | Hydraulic system, control method for hydraulic system and engineering machinery therewith |
| CN104314903A (en) * | 2014-09-30 | 2015-01-28 | 徐州重型机械有限公司 | Fast response device, hydraulic load sensing system and engineering vehicle |
| CN111627284A (en) * | 2020-06-08 | 2020-09-04 | 湖南翰坤实业有限公司 | VR-based children earthquake safety education simulation system and method |
| CN112128177A (en) * | 2020-08-27 | 2020-12-25 | 中联重科股份有限公司 | Method for dynamically adjusting engineering machinery power |
| CN114215799A (en) * | 2022-02-21 | 2022-03-22 | 徐州徐工环境技术有限公司 | Load-sensitive constant-power hydraulic system for vertical pressure station |
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| CN111627284A (en) * | 2020-06-08 | 2020-09-04 | 湖南翰坤实业有限公司 | VR-based children earthquake safety education simulation system and method |
| CN112128177A (en) * | 2020-08-27 | 2020-12-25 | 中联重科股份有限公司 | Method for dynamically adjusting engineering machinery power |
| CN114215799A (en) * | 2022-02-21 | 2022-03-22 | 徐州徐工环境技术有限公司 | Load-sensitive constant-power hydraulic system for vertical pressure station |
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