CN101768990A - Hydraulic constant power control device for excavator - Google Patents
Hydraulic constant power control device for excavator Download PDFInfo
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- CN101768990A CN101768990A CN201010110297A CN201010110297A CN101768990A CN 101768990 A CN101768990 A CN 101768990A CN 201010110297 A CN201010110297 A CN 201010110297A CN 201010110297 A CN201010110297 A CN 201010110297A CN 101768990 A CN101768990 A CN 101768990A
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- swash plate
- plate variable
- constant power
- plunger
- linkage
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Abstract
The invention discloses a hydraulic constant power control device for an excavator, and belongs to the technical field of excavators. The hydraulic constant power control device comprises an engine and a pilot pump which are axially connected with plunger-type dual-linkage swash plate variable pumps. The plunger-type dual-linkage swash plate variable pumps are connected with an MCU controller consisting of singlechips through pressure transmitters respectively. The hydraulic constant power control device for the excavator is characterized in that: the MCU controller is connected with the plunger-type dual-linkage swash plate variable pumps by power regulators through an electromagnetic proportional valve respectively. The hydraulic constant power control device for the excavator solves the problem that an actual constant power curve and a theoretical constant power curve of the plunger-type dual-linkage swash plate variable pumps are inconsistent. Therefore, the plunger-type dual-linkage swash plate variable pumps are regulated by approaching the actual constant power curve in the actual work process, and the capacity of the engine is fully brought into play. Meanwhile, the flow of the plunger-type dual-linkage swash plate variable pumps can be greatly reduced during system overflow, the power loss is reduced, and the fuel oil is saved.
Description
Technical field the invention belongs to the excavator technical field, relates to a kind of hydraulic constant power control device for excavator.
Pressure in the excavator hydraulic system of the very large and medium-sized tonnage of force value variation of background technology full hydraulic excavator hydraulic system in a working cycles generally will be at 30Kfg/mm
2-350Kfg/mm
2Between change, (W is a plunger type duplex swash plate variable pump power absorbed according to the consumed power W=P * Q/ η of plunger type duplex swash plate variable pump in the hydraulic system, P is the pressure that main pump is discharged, Q is the flow that main pump is discharged, η is the efficient of main pump) in this formula as can be seen, if keep plunger type duplex swash plate variable pump discharge capacity constant, its plunger type duplex swash plate variable pump power absorbed also can significantly change along with the variation of pressure.In order to improve this situation, the hydraulic power supply of excavator generally all is to adopt plunger type swash plate duplex variable pump both at home and abroad now, and adopt permanent power control, purpose is to make plunger type duplex swash plate variable pump power absorbed become definite value by adjusting plunger type duplex swash plate variable pump delivery in certain pressure range.But operating principle and P-Q (pressure-flow) curve of analyzing this main pump can be found, because the used permanent power governor of this plunger type duplex swash plate variable pump is two springs different in size that are nested together inside and outside utilizing, in the process that pressure raises, beginning is the long spring of compression only, compress two then and be equivalent to spring in parallel, produce the actual plunger type duplex swash plate variable pump absorbed power P-Q broken line shown in curve I among Fig. 1.And theoretic permanent power curve should be an approximate inverse function curve, promptly shown in curve II in the accompanying drawing 1.Two curves are compared as can be seen: in the area of low pressure, particularly near power starts to control an A point, the actual absorption power of plunger type duplex swash plate variable pump will be far longer than theoretical power (horse-power), this motor that just requires to be mated will have enough power headroom, otherwise can cause motor to suppress car, and in the high-pressure area, the actual absorption power of plunger type duplex swash plate variable pump makes that again less than theoretical power (horse-power) the excavator action is slack-off.Also there is one in this main pump when system pressure reaches setting pressure simultaneously, main overflow valve on the hydraulic system is opened, at this time the hydraulic oil of plunger type duplex swash plate variable pump output almost all flows out from overflow valve, thereby causes the problem of power loss.
Summary of the invention the objective of the invention is to solve actual permanent power curve and the inconsistent technical problem that causes power loss of theoretical permanent power curve that there is plunger type duplex swash plate variable pump in prior art, a kind of hydraulic constant power control device for excavator is provided, thereby overcomes the deficiencies in the prior art.
For achieving the above object, the present invention has taked following technical scheme: comprise that the motor that is connected with plunger type duplex swash plate variable pump shaft is connected with the MCU controller of being made up of single-chip microcomputer by pressure transmitter respectively with pioneer pump, plunger type duplex swash plate variable pump, its main points are that the MCU controller is connected with plunger type duplex swash plate variable pump by power governor respectively by electromagnetic proportional valve again, form a closed-loop path.
The pressure size of the plunger type duplex swash plate variable pump output that the present invention can gather according to pressure transmitter, by searching the curvilinear coordinate parameter of forming by 2-D data, export corresponding electromagnetic proportional valve output current, flow size with the output of control plunger type duplex swash plate variable pump makes the power absorbed W=P * Q/ η of plunger type duplex swash plate variable pump remain a constant.
The invention solves the actual permanent power curve and the inconsistent problem of theoretical permanent power curve of plunger type duplex swash plate variable pump, plunger type duplex swash plate variable pump is adjusted with approaching real permanent power curve in practical work process, can give full play to the ability of motor like this, plunger type duplex swash plate variable pump flow in the time of simultaneously can also being reduced in system's overflow greatly, reduce power loss, save fuel oil.
Description of drawings Fig. 1 is a prior art P-Q curvilinear motion schematic diagram;
Fig. 2 is an operating principle structural representation of the present invention;
Fig. 3 is a P-Q curvilinear motion schematic diagram of the present invention;
Fig. 4 is a P-Q curvilinear motion schematic diagram in the excavator course of work of the present invention.
Among the figure 1,7, pressure transmitter 2,10, plunger type duplex swash plate variable pump 3,9, power governor 4, electromagnetic proportional valve 5, MCU controller 6, motor 8, pioneer pump
The specific embodiment is according to Fig. 2, it comprises the present invention with 2,10 motors that are connected 6 of plunger type duplex swash plate variable pump and being connected with the MCU controller of being made up of single-chip microcomputer 5 by pressure transmitter 1,7 respectively with pioneer pump 8, plunger type duplex swash plate variable pump 2,10, and MCU controller 5 is connected with plunger type duplex swash plate variable pump 2,10 by power governor 3,9 respectively by electromagnetic proportional valve 4 again.
The concrete operating principle of the present invention is described below:
The discharge capacity of plunger type duplex swash plate variable pump 2,10 is along with the size of the electric current of electromagnetic proportional valve 4 changes, and as shown in Figure 3, the P-Q curve of plunger type duplex swash plate variable pump 2,10 is A during the electric current I of passing through when electromagnetic proportional valve 4=a mA; The P-Q curve of plunger type duplex swash plate variable pump 2,10 is B during the electric current I of passing through when electromagnetic proportional valve 4=b mA; The P-Q curve of plunger type duplex swash plate variable pump 2,10 is C during the electric current I of passing through when electromagnetic proportional valve 4=c mA.
Excavator in the excacation process, as shown in Figure 4, when the pressure of hydraulic system equals P
1The time, the electric current that MCU outputs to electromagnetic proportional valve 4 is I
1, making the flow of plunger type duplex swash plate variable pump 2,10 through regulation and control is Q
1When the pressure of hydraulic system equals P
2The time, the electric current that MCU controller 5 outputs to electromagnetic proportional valve 4 is I
2, making the flow of plunger type duplex swash plate variable pump 2,10 through regulation and control is Q
2... when the pressure of hydraulic system equals P
nThe time, the electric current that MCU controller 5 outputs to electromagnetic proportional valve 4 is I
n, making the flow of plunger type duplex swash plate variable pump 2,10 through regulation and control is Q
nSo just have a little 1, point 2, desirable permanent power curve that can make W=P * Q/ η equal constant of some 3...... point n composition.
When hydraulic system pressure during near the oil pressure relief set, reduce rapidly by the electric current that makes the electromagnetic proportional valve 4 of flowing through, can reduce the discharge capacity of plunger type duplex swash plate variable pump 2,10 rapidly, it is very low that excess flow is dropped to, thereby saved fuel consumption.
Claims (1)
1. hydraulic constant power control device for excavator, it comprises that the motor that is connected with plunger type duplex swash plate variable pump shaft is connected with the MCU controller of being made up of single-chip microcomputer by pressure transmitter respectively with pioneer pump, plunger type duplex swash plate variable pump, it is characterized in that the MCU controller is connected with plunger type duplex swash plate variable pump by power governor respectively by electromagnetic proportional valve again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010110297A CN101768990A (en) | 2010-02-06 | 2010-02-06 | Hydraulic constant power control device for excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010110297A CN101768990A (en) | 2010-02-06 | 2010-02-06 | Hydraulic constant power control device for excavator |
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| Publication Number | Publication Date |
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| CN101768990A true CN101768990A (en) | 2010-07-07 |
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| CN201010110297A Pending CN101768990A (en) | 2010-02-06 | 2010-02-06 | Hydraulic constant power control device for excavator |
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| CN (1) | CN101768990A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261106A (en) * | 2011-05-17 | 2011-11-30 | 陈海波 | Electro-hydraulic control device of excavating machine and flow control method of load-sensing variable pump |
| CN102817394A (en) * | 2012-09-07 | 2012-12-12 | 三一重机有限公司 | Hydraulic pump control system of excavator, method and excavator |
| CN103266643A (en) * | 2013-05-23 | 2013-08-28 | 山重建机有限公司 | Gas-electric double-power excavator controller |
| CN103510564A (en) * | 2012-06-26 | 2014-01-15 | 山重建机有限公司 | Device for controlling constant power of excavator |
| CN103615029A (en) * | 2013-11-01 | 2014-03-05 | 中外合资沃得重工（中国）有限公司 | Power control system and method of negative flow hydraulic pump of middle-large size hydraulic excavator |
| CN105065360A (en) * | 2015-08-31 | 2015-11-18 | 苏州萨伯工业设计有限公司 | Constant-power control device and pressure variable control method thereof |
| CN105347193A (en) * | 2015-11-23 | 2016-02-24 | 潍柴动力股份有限公司 | Constant-power and variable-power point control system and method for crane |
| CN105544644A (en) * | 2015-12-31 | 2016-05-04 | 湖南瑞龙重工科技有限公司 | Control system and method for constant-power work of active carry-scraper |
| CN108999818A (en) * | 2018-09-29 | 2018-12-14 | 宁波精壹机械制造有限公司 | A kind of tunneling machine hydraulic system |
-
2010
- 2010-02-06 CN CN201010110297A patent/CN101768990A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261106A (en) * | 2011-05-17 | 2011-11-30 | 陈海波 | Electro-hydraulic control device of excavating machine and flow control method of load-sensing variable pump |
| CN102261106B (en) * | 2011-05-17 | 2013-06-05 | 昆山航天智能技术有限公司 | Electro-hydraulic control device of excavating machine and flow control method of load-sensing variable pump |
| CN103510564A (en) * | 2012-06-26 | 2014-01-15 | 山重建机有限公司 | Device for controlling constant power of excavator |
| CN102817394A (en) * | 2012-09-07 | 2012-12-12 | 三一重机有限公司 | Hydraulic pump control system of excavator, method and excavator |
| CN102817394B (en) * | 2012-09-07 | 2014-10-01 | 三一重机有限公司 | Hydraulic pump control system of excavator, method and excavator |
| CN103266643A (en) * | 2013-05-23 | 2013-08-28 | 山重建机有限公司 | Gas-electric double-power excavator controller |
| CN103615029A (en) * | 2013-11-01 | 2014-03-05 | 中外合资沃得重工（中国）有限公司 | Power control system and method of negative flow hydraulic pump of middle-large size hydraulic excavator |
| CN105065360A (en) * | 2015-08-31 | 2015-11-18 | 苏州萨伯工业设计有限公司 | Constant-power control device and pressure variable control method thereof |
| CN105347193A (en) * | 2015-11-23 | 2016-02-24 | 潍柴动力股份有限公司 | Constant-power and variable-power point control system and method for crane |
| CN105544644A (en) * | 2015-12-31 | 2016-05-04 | 湖南瑞龙重工科技有限公司 | Control system and method for constant-power work of active carry-scraper |
| CN108999818A (en) * | 2018-09-29 | 2018-12-14 | 宁波精壹机械制造有限公司 | A kind of tunneling machine hydraulic system |
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Open date: 20100707 |