CN102734276B - Load sensing electric proportion hydraulic control system and engineering machinery - Google Patents

Load sensing electric proportion hydraulic control system and engineering machinery Download PDF

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Publication number
CN102734276B
CN102734276B CN201210218447.7A CN201210218447A CN102734276B CN 102734276 B CN102734276 B CN 102734276B CN 201210218447 A CN201210218447 A CN 201210218447A CN 102734276 B CN102734276 B CN 102734276B
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load
pressure
sensitive
valve
hydraulic pump
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CN102734276A (en
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禹阳华
周畅
张国瑞
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Sany Automobile Hoisting Machinery Co Ltd
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Sany Automobile Hoisting Machinery Co Ltd
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Abstract

The invention provides a load sensing electric proportion hydraulic control system. The load sensing electric proportion hydraulic control system comprises an electric proportion hydraulic pump, a load sensing valve, a pressure sensing device for detecting first pressure at a liquid outlet of the electric proportion hydraulic pump and second pressure on a load feedback loop of the load sensing valve, and a controller which is connected to the pressure sensing device and the electric proportion hydraulic pump and is used for controlling the liquid outlet flow of the electric proportion hydraulic pump according to the first pressure, the second pressure and the preset pressure difference from the pressure sensing device. The invention also provides engineering machinery. By the technical scheme, a pump without the load feedback function can be controlled by utilizing an electrical program, so that load feedback is realized, the output flow of the pump is matched with the input flow of the valve, a system is simplified, and the efficiency of the system is improved.

Description

Load-sensitive electricity proportional hydraulic control system and engineering machinery
Technical field
The present invention relates to technical field of hydraulic, in particular to a kind of load-sensitive electricity proportional hydraulic control system and a kind of engineering machinery.
Background technique
At present, be used for realizing in the flow distributing system irrelevant with load, load-sensitive valve (LS valve) detects load and induced pressure is caused flow control device on pump, realizes the flow of pressure reduction (main pump outlet pressure and control valve delivery pressure) control pump.This system needs load-sensitive valve to detect load and induced pressure is caused the flow control device of pump, is regulated by the flow of the pressure difference between pump discharge pressure and load feedback pressure to pump.Pump duty regulative mode according to system support can be divided into two classes, and a class is oil pump spring setting compensation pressure, as changed compensatory pressure, need shut down and carry out spring force adjustment; Another kind of for becoming compensatory pressure proportional electromagnetic valve, by electrically regulating compensatory pressure.
Load Independent fluxes system such as Fig. 7 in correlation technique shows, is made up of variable displacement pump 702, variable displacement pump controlling mechanism 704, throttle valve 706, pressure compensator 708, shuttle valve 710 and load 712.There is following shortcoming in this system:
1) system need select load feedback pump as this variable displacement pump 702, the load feedback pressure of load 712 is connected to the control mouth of variable displacement pump 702, and hydraulic pipe line arranges relative complex;
2) regulate for realizing becoming compensatory pressure, band need be selected to become the load feedback pump of compensatory pressure proportional electromagnetic valve, and the pump discharge flow requiring the flow control device of pump corresponding mates completely with the flow of valve, therefore need to use this variable displacement pump controlling mechanism 704 to coordinate with variable displacement pump 702, simultaneously, impacting for preventing from producing during load 718 action, so just requiring must do a large amount of experiments at the beginning of system research and development, with the matching of verification system.
Therefore, need a kind of new hydraulic control technology to simplify hydraulic pipe line and arrange, solve the matching problem of pump and valve flow.
Summary of the invention
The present invention, just based on the problems referred to above, proposes a kind of new hydraulic control technology, utilizes the pump of electric program control not bringing onto load feedback, to realize load feedback, and solves the matching problem of pump and valve flow, simplify system and improve the efficiency of system.
In view of this, the present invention proposes a kind of load-sensitive electricity than row hydraulic control system, comprise: electric proportional hydraulic pump, load-sensitive valve, wherein, described load-sensitive valve is connected to described electric proportional hydraulic pump and load, described load-sensitive electricity also comprises than row hydraulic control system: pressure sensitive device, for detecting first pressure at the liquid outlet place of described electric proportional hydraulic pump, and the second pressure on the load feedback loop of described load-sensitive valve; Controller, is connected to described pressure sensitive device and described electric proportional hydraulic pump, according to from described first pressure of described pressure sensitive device, described second pressure and default pressure difference, controls the flow quantity that goes out of described electric proportional hydraulic pump.
In technique scheme, preferably, described pressure sensitive device comprises: the first pressure transducer, is arranged on the liquid outlet place of described electric proportional hydraulic pump; And second pressure transducer, be arranged on the load feedback loop of described load-sensitive valve.
In above-mentioned arbitrary technological scheme, preferably, also comprise: described controller is arranged on inside or the outside of described electric proportional hydraulic pump.
In above-mentioned arbitrary technological scheme, preferably, described controller specifically comprises: control chip and electric proportional valve, and described control chip is electrically connected to described pressure sensitive device and described electric proportional valve; And described electric proportional valve is arranged on the liquid outlet of described electric proportional hydraulic pump, according to the control command from described control chip, the flow quantity that goes out of described electric proportional hydraulic pump is controlled.
In above-mentioned arbitrary technological scheme, preferably, described controller also comprises: arrange module, for arranging instruction according to what receive, arranges the numerical value of described pressure difference.
In above-mentioned arbitrary technological scheme, preferably, described control chip is provided with external interface, described external interface can be connected to external input device, to arrange described pressure difference.
In above-mentioned arbitrary technological scheme, preferably, also comprise: constant difference overflow valve, be connected to the load feedback loop of the described liquid outlet of electric proportional hydraulic pump, the liquid entering hole of described load-sensitive valve and described load-sensitive valve, the inlet hydraulic of the liquid entering hole flowing into described load-sensitive valve is controlled.
In above-mentioned arbitrary technological scheme, preferably, also comprise: solenoid valve, be connected to described controller, according to from described first pressure of described pressure sensitive device, described second pressure and default pressure difference, the inlet hydraulic of the liquid entering hole flowing into described load-sensitive valve is controlled.
In above-mentioned arbitrary technological scheme, preferably, also comprise: display unit, be connected to described controller, the described liquid outlet flow of electric proportional hydraulic pump and/or the liquid entering hole flow of described load-sensitive valve are shown in real time.
According to another aspect of the invention, also proposed a kind of engineering machinery, it is characterized in that, the load-sensitive comprised as described in above-mentioned arbitrary technological scheme is electric than row hydraulic control system.
By above technological scheme, realize the adjustment of pump duty by electrical control, hydraulic system has been simplified and improves the efficiency of hydraulic system.
Accompanying drawing explanation
Fig. 1 shows the structural representation of load-sensitive according to an embodiment of the invention electricity than row hydraulic control system;
Fig. 2 is the structural representation of load-sensitive electricity than row hydraulic control system of a kind of embodiment of the embodiment shown in Fig. 1;
Fig. 3 is the structural representation of load-sensitive electricity than row hydraulic control system of the another kind of embodiment of the embodiment shown in Fig. 1;
Fig. 4 shows the structural representation of load-sensitive electricity according to another embodiment of the invention than row hydraulic control system;
Fig. 5 is the structural representation of load-sensitive electricity than row hydraulic control system of the another kind of embodiment of the embodiment shown in Fig. 4;
Fig. 6 shows the structural representation of load-sensitive electricity according to another embodiment of the invention than row hydraulic control system;
Fig. 7 shows the structural representation of the distribution of load independent flow system in correlation technique.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
As shown in Figure 1, be that the load-sensitive of a specific embodiment of the present invention is electric than row hydraulic control system, this system comprises: electric proportional hydraulic pump 106, load-sensitive valve 104, controller 110 and pressure sensitive device 108.Load-sensitive valve 104 is connected to load 102 and electric proportional hydraulic pump 106, electricity proportional hydraulic pump 106 also links to controller 110, controller 110 is connected to pressure sensitive device 108, pressure sensitive device 108 detects first pressure at the liquid outlet place of electric proportional hydraulic pump 106, and the second pressure on the load feedback loop of load-sensitive valve 104.When the system is operating, controller 110 is according to from the first pressure of pressure sensitive device 108, the second pressure and default pressure difference, the flow quantity that goes out of electric proportional hydraulic pump 106 is controlled, makes the pressure difference of the first pressure, the second pressure equal with preset pressure difference.Make flows match needed for electric proportional hydraulic pump 106 output flow and load 102 like this.
In this technological scheme, matching relationship needed for electricity proportional hydraulic pump 106 output flow and load 102 between flow specifically refers to, by the first pressure, the second pressure that detect, the output flow of electric proportional hydraulic pump 106 is controlled, thus the real-time pressure difference of the first pressure and the second pressure is controlled, make real-time pressure poor=pressure difference of the first pressure-the second pressure=default.Certainly, in specific implementation process, can allow to there is certain margin of error between real-time pressure difference and the pressure difference preset.
As shown in Figure 2, under a kind of concrete mode of execution, pressure sensitive device 108 comprises: the first pressure transducer 202, is arranged on the liquid outlet place of electric proportional hydraulic pump 106, for detecting first pressure at the liquid outlet place of electric proportional hydraulic pump 106; And second pressure transducer 204, be arranged on the load feedback loop of load-sensitive valve 104, the second pressure on the load feedback loop detecting load-sensitive valve 104.
In technique scheme, controller 110 can be arranged on inside or the outside of electric proportional hydraulic pump 106.Particularly, when controller 110 is arranged at the inside of electric proportional hydraulic pump 106, controller 110 and electric proportional hydraulic pump 106 are integrated device, i.e. automatically controlled dosing pump, directly can accept electrical control; Controller 110 also can be placed in the outside of electric proportional hydraulic pump 106, then controller 110 and electric proportional hydraulic pump 106 are independent device is two self-contained units be electrically connected.
Particularly, this controller 110 can comprise control chip 302 and electric proportional valve 304.As shown in Figure 3, control chip 302 is electrically connected to pressure sensitive device 108 and electric proportional valve 304; Electric proportional valve 304 is arranged on the liquid outlet of electric proportional hydraulic pump 106, according to the control command from control chip 302, controls the flow quantity that goes out of electric proportional hydraulic pump 106.
In this technological scheme, control chip 302 receives the numerical value of the first pressure from pressure sensitive device 108 and the second pressure, to calculate its real-time pressure difference, and combine the numerical value of the pressure difference preset, judge whether to need to carry out flow control to electric proportional hydraulic pump 106, wherein, if real-time pressure difference is unequal with preset pressure difference, or real-time pressure difference and preset pressure poor between quantity difference when being greater than default margin of error, need to control the flow of electric proportional hydraulic pump 106, otherwise do not need to control.Particularly, by control chip 302 carry out needs control time, generate and correspond to the regulating command of real-time pressure difference, and be sent to electric proportional valve 304, its valve port opening is controlled, go out flow quantity with hydraulic control valve 106.
Controller 110 also comprises and arranges module 306.Arrange module 306 for according to receive input device 310 instruction is set, the numerical value of described preset pressure difference is arranged.Input device 310 is by arranging the keyboard or knob that module 306 provides; Also can be connected to the external input device arranging module 306, then now this controller 110 will provide the interface or communication module that to carry out with external input device being connected.
In technique scheme, also comprise display unit 308.Display unit 308 is connected to controller 110, can be display screen, tutorial light or instrument etc., the liquid outlet flow of electric proportional hydraulic pump 106 and/or the liquid entering hole flow of load-sensitive valve 104 are shown in real time, be convenient to user and carry out real-time monitored, to avoid occurring the system failure etc., increase the Security of system.
As shown in Figure 4, be that the load-sensitive of an alternative embodiment of the invention is electric than row hydraulic control system, this system comprises: electric proportional hydraulic pump 106, load-sensitive valve 104, controller 110, pressure sensitive device 108 and constant difference overflow valve 402.Load-sensitive valve 104 is connected to load 102 and electric proportional hydraulic pump 106, electricity proportional hydraulic pump 106 also links to controller 110, controller 110 is connected to pressure sensitive device 108, pressure sensitive device 108 detects first pressure at the liquid outlet place of electric proportional hydraulic pump 106, and the second pressure on the load feedback loop of load-sensitive valve 104.Constant difference overflow valve 402 is connected to the load feedback loop of the liquid outlet of electric proportional hydraulic pump 106, the liquid entering hole of load-sensitive valve 104 and load-sensitive valve 104.
During system works, controller 110 is according to from the first pressure of pressure sensitive device 108, the second pressure and default pressure difference, the flow quantity that goes out of electric proportional hydraulic pump 106 is controlled, makes the pressure difference of the first pressure, the second pressure and preset pressure difference equal or be less than default error threshold scope.Make flows match needed for electric proportional hydraulic pump 106 output flow and load 102 like this.
But because the theoretical output flow of electric proportional hydraulic pump 106 and actual output flow exist error, then when actual output flow does not mate with flow needed for load 102, can by setting the pressure difference of constant difference overflow valve 402, the flow that then constant difference overflow valve 402 can be unnecessary in the output flow of earial drainage electricity proportional hydraulic pump 106, guarantees that the feed liquor flow flowed in load-sensitive valve 104 meets system requirements further.
In technique scheme, the effect of constant difference overflow valve 402 also can be realized by solenoid valve 502, specifically as shown in Figure 5.
In Figure 5, solenoid valve 502 is connected to described controller 110, according to from described first pressure of described pressure sensitive device 108, described second pressure and default pressure difference, controls the inlet hydraulic of the liquid entering hole flowing into described load-sensitive valve.The technique effect identical with technique scheme can be reached.
Particularly, in this technological scheme, the oil circuit between solenoid valve 502 with electric proportional hydraulic pump 106 to load-sensitive valve 104 is connected, and the fluid in this oil circuit can be introduced in fuel tank.Detected by second pressure of pressure sensitive device 108 to the first pressure of the liquid outlet of electric proportional hydraulic pump 106 and the load circuit of load-sensitive valve 104, and be sent to controller 110.Controller 110 is poor according to the first pressure, the second pressure and preset pressure, and judging whether needs the feed liquor flow to flowing into load-sensitive valve 104 to control.When the pressure difference of the first pressure and the second pressure and preset pressure difference unequal, or when differ larger with preset pressure difference, judgement needs the feed liquor flow of responsive to load valve 104 to control.The force value size needing to control is analyzed by controller 110, thus calculate the valve port opening of solenoid valve 502 further, and corresponding instruction is sent to solenoid valve 502, realize the control to solenoid valve 502, and finally to the control of the feed liquor flow of inflow load-sensitive valve 104.
Fig. 6 is that the load-sensitive electricity of an alternative embodiment of the invention is than row hydraulic control system.As shown in the figure, this load-sensitive electricity comprises electric proportional hydraulic pump 602 and load-sensitive valve 606 than row hydraulic control system, wherein, inputs fluid, and by load-sensitive valve 606, fluid is dispensed to load by electric proportional hydraulic pump 602 in load-sensitive valve 606.In this hydraulic system operation, ideally, wish that the output flow pressure of electric proportional hydraulic pump 602 and the load feedback pressure of load-sensitive valve 606 exist fixing pressure difference, but under actual conditions, these two force value often do not conform to, then now need to control the output flow of electric proportional hydraulic pump 602.
Can directly control the output flow of electric proportional hydraulic pump 602, particularly, the first pressure transducer 608 is arranged on the liquid outlet place of electric proportional hydraulic pump 602, the second pressure transducer 610 is arranged on the load feedback loop of load-sensitive valve 606.When the system is operating, first pressure transducer 608, second pressure transducer 610 records electric proportional hydraulic respectively and pumps liquid mouth pressure and load feedback pressure P 1, P2, by the pressure difference △ P between P1, P2 is compared with preset pressure difference, if unequal or difference too large, beyond the margin of error preset, then need the flow regulating electric proportional hydraulic pump 602, make △ P equal as far as possible with preset pressure difference or reduce difference.
Particularly, by being arranged on the inner or outside electric proportional valve of electric proportional hydraulic pump 602, its output flow is controlled.This electric proportional valve receives the regulating command of self-controller, and this regulating command to be the numerical value of P1, the P2 obtained respectively according to the first pressure transducer and the second pressure transducer by controller and preset pressure value carry out analytical calculation obtains.
But under actual conditions, after above-mentioned control procedure, the output flow of electric proportional hydraulic pump 602 still may be undesirable, then can be controlled further by constant difference overflow valve 604.
Constant difference overflow valve 604, is connected to the load feedback loop of the liquid outlet of electric proportional hydraulic pump 602, the liquid entering hole of load-sensitive valve 606 and load-sensitive valve 606.User can pre-set the rated pressure difference of constant difference overflow valve 604, such as be set to above-mentioned preset pressure poor, then by carrying out overflow control to the output fluid of electric proportional hydraulic pump 602, thus can guarantee that the feed liquor flow flowing into load-sensitive valve 606 is more accurate.
Specifically comprise selector valve 612, pressure-compensated valve 614 in load-sensitive valve 606 in figure, wherein, pressure-compensated valve 614 makes system realize the assignment of traffic irrelevant with described load when multiple load action.Certainly, also more devices such as secondary relief (not shown) can be increased according to specific needs.Pressure oil circuit and the intercommunication of load-sensitive valve 606 oil circuit between each load.
The invention allows for a kind of engineering machinery, the load-sensitive comprised described in above-mentioned arbitrary technological scheme is electric than row hydraulic control system.
More than be described with reference to the accompanying drawings technological scheme of the present invention, consider that in correlation technique, hydraulic pipe line arranges relative complex, there is difficulty in the flow matches of pump discharge flow and load-sensitive valve, therefore, the invention provides a kind of load-sensitive electricity than row hydraulic control system and a kind of engineering machinery, utilize electric program control not bringing onto load feedback pump, to realize load feedback, and solve the flow matches problem of electric proportional hydraulic pump duty control problem and pump and valve.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (8)

1. a load-sensitive electricity proportional hydraulic control system, comprise electric proportional hydraulic pump, load-sensitive valve, wherein, described load-sensitive valve is connected to described electric proportional hydraulic pump and load, it is characterized in that, described load-sensitive electricity proportional hydraulic control system also comprises:
Pressure sensitive device, for detecting first pressure at the liquid outlet place of described electric proportional hydraulic pump, and the second pressure on the load feedback loop of described load-sensitive valve;
Controller, is connected to described pressure sensitive device and described electric proportional hydraulic pump, according to from described first pressure of described pressure sensitive device, described second pressure and default pressure difference, controls the flow quantity that goes out of described electric proportional hydraulic pump;
Constant difference overflow valve, is connected to the load feedback loop of the described liquid outlet of electric proportional hydraulic pump, the liquid entering hole of described load-sensitive valve and described load-sensitive valve, controls the inlet hydraulic of the liquid entering hole flowing into described load-sensitive valve;
Solenoid valve, is connected to described controller, according to from described first pressure of described pressure sensitive device, described second pressure and default pressure difference, controls the inlet hydraulic of the liquid entering hole flowing into described load-sensitive valve.
2. load-sensitive electricity proportional hydraulic control system according to claim 1, it is characterized in that, described pressure sensitive device comprises:
First pressure transducer, is arranged on the liquid outlet place of described electric proportional hydraulic pump; And
Second pressure transducer, is arranged on the load feedback loop of described load-sensitive valve.
3. load-sensitive electricity proportional hydraulic control system according to claim 1, is characterized in that, also comprise: described controller is arranged on inside or the outside of described electric proportional hydraulic pump.
4. load-sensitive electricity proportional hydraulic control system according to claim 3, it is characterized in that, described controller specifically comprises: control chip and electric proportional valve,
Described control chip is electrically connected to described pressure sensitive device and described electric proportional valve; And
Described electric proportional valve is arranged on the liquid outlet of described electric proportional hydraulic pump, according to the control command from described control chip, controls the flow quantity that goes out of described electric proportional hydraulic pump.
5. load-sensitive electricity proportional hydraulic control system according to claim 4, it is characterized in that, described controller also comprises:
Module being set, for arranging instruction according to what receive, the numerical value of described pressure difference being arranged.
6. load-sensitive electricity proportional hydraulic control system according to claim 4, it is characterized in that, described control chip is provided with external interface, and described external interface can be connected to external input device, to arrange described pressure difference.
7. load-sensitive electricity proportional hydraulic control system according to any one of claim 1 to 6, is characterized in that, also comprise:
Display unit, is connected to described controller, shows in real time the described liquid outlet flow of electric proportional hydraulic pump and/or the liquid entering hole flow of described load-sensitive valve.
8. an engineering machinery, is characterized in that, comprising: the load-sensitive electricity proportional hydraulic control system according to any one of claim 1 to 7.
CN201210218447.7A 2012-06-28 2012-06-28 Load sensing electric proportion hydraulic control system and engineering machinery Active CN102734276B (en)

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