CN102251547B - Pilot control system of novel hydraulic excavator - Google Patents
Pilot control system of novel hydraulic excavator Download PDFInfo
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- CN102251547B CN102251547B CN201110158637XA CN201110158637A CN102251547B CN 102251547 B CN102251547 B CN 102251547B CN 201110158637X A CN201110158637X A CN 201110158637XA CN 201110158637 A CN201110158637 A CN 201110158637A CN 102251547 B CN102251547 B CN 102251547B
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- reducing valve
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Abstract
The invention discloses a pilot control system of a novel hydraulic excavator. The pilot control system comprises a first pilot overflow valve, a hydraulic pump and a second pilot overflow valve, wherein one end of the hydraulic pump is connected in parallel with one end of the second pilot overflow valve and connected in series with one end of the first pilot overflow valve, the other end of the hydraulic pump and the other end of the second pilot overflow valve extend into an oil tank together, and both the first pilot overflow valve and the second pilot overflow valve are provided with a temperature adjustor; the pilot control system also comprises a controller and an energy accumulator; the other end of the first pilot overflow valve is connected with the energy accumulator and then connected with a travel motor assembly through an electromagnetic proportional pressure reducing valve; and the electromagnetic proportional pressure reducing valve is connected with the controller. The pilot control system of the novel hydraulic excavator has quick response to input signals, is convenient to install, use and maintain, has high reliability, has no additional cost, and has wide application.
Description
Technical field
The present invention relates to excavator control technology field, relate in particular to a kind of pilot control system of novel hydraulic excavator.
Background technology
Excavator since when work circumstance complication, for adapting to different topographic features, need excavator under high low speed duty, to switch, in order to switch at work this two kinds of speeds of travel, the excavator pilot control system must can be supported high low speed switching.
The present high low speed that comprises the excavator pilot control system switches the pipeline structure block diagram as shown in Figure 1, mainly be comprised of electromagnetic direction valve 1, precursor overflow valve 2 and running motor assembly 3, wherein running motor assembly 3 comprises interconnective running motor 31, running motor adjuster 32 and the fast control valve 33 of walking height.During work, electromagnetic direction valve 1 no power, switching channel PT mouth in the running motor assembly 3 links to each other with fuel tank 0 by electromagnetic direction valve 1, precursor overflow valve 4, hydraulic pump 5 and precursor overflow valve 2 etc., pipeline inner pressure is low, the fast control valve 33 of walking height is in the I position, the 32 large chamber oil returns of running motor adjuster, and piston is in the left side of running motor adjuster 32, running motor 31 invariants, the walking of hydraulic crawler excavator low speed; After electromagnetic direction valve 1 energising is opened, switching channel PT in the running motor 31 communicates with the excavator pilot control system, the pressure at PT mouth place is pilot pressure, the fast control valve 33 of walking height is operated in the II position, pilot pressure promotes the piston rod of running motor adjuster 32 by the fast control valve 33 of walking height, make running motor 31 in large flow status work, hydraulic crawler excavator becomes at a high speed walking, and this moment, whole pilot system pressure was set up by precursor overflow valve 2.When running motor 31 main hydraulic fluid port A, B pressure oscillation caused walking switching pipeline to have high pressure to exist, compression wave can be transmitted to precursor overflow valve 2, and precursor overflow valve 2 is with the high pressure elimination, to keep pilot system pressure constant.This advantage of system is that pressure setting is finished by precursor overflow valve, number of elements is few, shortcoming is: (1) walking is switched loine pressure and can be risen and fallen up and down with pilot system pressure, situation is unstable, when running motor 31 main hydraulic fluid port A, B pressure oscillation cause walking switching pipeline that high pressure is arranged, all elements all will bear the impact of high-voltage pulse hydraulic oil in the system, and are influential to component life; (2) system can only support the running motor of two kinds of speed, can not satisfy the needs of multiple speed, continuously variable.
Summary of the invention
Problem for above-mentioned existence, the purpose of this invention is to provide a kind of pilot control system of novel hydraulic excavator, can not only keep switching the pressure stability of pipeline, pressure oil can be imported fuel tank when in pipeline, surpassing set pressure, avoid other original paper to be subject to the impact of hydraulic impulse, but when running motor multiple spot variable, can also provide the continually varying power source, can satisfy the needs of multiple speed, continuously variable.
The objective of the invention is to be achieved through the following technical solutions:
A kind of pilot control system of novel hydraulic excavator, comprise the first precursor overflow valve, hydraulic pump, the second precursor overflow valve, one end of hydraulic pump one end and the second precursor overflow valve also connects, be connected in series with the first precursor overflow valve one end, the other end stretches into fuel tank with the other end of the second precursor overflow valve, the first precursor overflow valve and the second precursor overflow valve are all with thermoregulator, wherein, also comprise controller and accumulator, the described first precursor overflow valve other end is connected with the running motor assembly by a solenoid-operated proportional reducing valve after accumulator connects with being connected, and described solenoid-operated proportional reducing valve is connected with described controller.
Above-mentioned hydraulic crawler excavator pilot control system, wherein, described controller to definite value electric current of described solenoid-operated proportional reducing valve, makes described solenoid-operated proportional reducing valve that pilot pressure is reduced to set pressure, and exports to the running motor assembly when hydraulic crawler excavator need to be walked switching.
Above-mentioned hydraulic crawler excavator pilot control system, wherein, when the downstream pressure of described solenoid-operated proportional reducing valve surpassed described set pressure, described solenoid-operated proportional reducing valve spool can be connected its delivery outlet and described fuel tank, too high pressure is let out described fuel tank, to keep the constant of downstream pressure.
Above-mentioned hydraulic crawler excavator pilot control system wherein, changes the value that described controller is inputted the described definite value electric current of described solenoid-operated proportional reducing valve, and the pressure that the output of described solenoid-operated proportional reducing valve is different is with the different requirements of the variable that satisfies the running motor assembly.
Above-mentioned hydraulic crawler excavator pilot control system, wherein, the scope of the value of the pressure that described solenoid-operated proportional reducing valve output is different is to pilot system pressure from zero.
Compared with the prior art, pilot control system of novel hydraulic excavator of the present invention is installed and used easy to maintenancely to input signal response rapidly, possesses high reliability, without extra cost, is widely used.
Description of drawings
Fig. 1 is hydraulic crawler excavator pilot control system and the interconnective structural representation of running motor assembly in the prior art;
Fig. 2 is pilot control system of novel hydraulic excavator of the present invention and the interconnective structural representation of running motor assembly.
The specific embodiment
The invention will be further described below in conjunction with schematic diagram and concrete operations embodiment.
As shown in Figure 2, pilot control system of novel hydraulic excavator of the present invention, specifically comprise the first precursor overflow valve 4, hydraulic pump 5, the second precursor overflow valve 2, one end of hydraulic pump 5 one ends and the second precursor overflow valve 2 also connects, be connected in series with the first precursor overflow valve 4 one ends, the other end stretches into fuel tank 0, the first precursor overflow valve 4 and the second precursor overflow valve 2 all with thermoregulator with the other end of the second precursor overflow valve 2, also comprises in addition controller 7 and accumulator 6.The first precursor overflow valve 4 other ends are connected with accumulator and are connected with running motor assembly 3 by a solenoid-operated proportional reducing valve 1 after connecting, solenoid-operated proportional reducing valve 1 is connected with controller 7, and wherein running motor assembly 3 comprises interconnective running motor 31, running motor adjuster 32 and the fast control valve 33 of walking height.An electric control gear is housed on the valve of solenoid-operated proportional reducing valve 1, can control the pressure of output, its operating principle is when peripheral control unit 7 during to continually varying electric current of electric control gear or voltage signal, the output pressure of solenoid-operated proportional reducing valve 1 can change along with the change of the signal of telecommunication, and output pressure is directly proportional with input current.
During specific works, controller 7 need to be walked when switching to 1 one definite value electric currents of solenoid-operated proportional reducing valve at hydraulic crawler excavator, makes solenoid-operated proportional reducing valve 1 that pilot pressure is reduced to set pressure, and exports to running motor assembly 3.When the downstream pressure of solenoid-operated proportional reducing valve 1 surpasses set pressure, the spool of solenoid-operated proportional reducing valve 1 can be connected its delivery outlet and fuel tank 0, too high pressure is let out in the fuel tank 0, to keep the constant of downstream pressure, can avoid the element in the hydraulic pressure impacting with high pressure pilot system.Solenoid-operated proportional reducing valve 1 can continuous wave output pressure under the maximum current of regulation, the force value size is from zero until pilot system pressure, definite value electric current by controller input solenoid-operated proportional reducing valve 1 different sizes, solenoid-operated proportional reducing valve 1 exportable different pressure is with the different requirements of the variable that satisfies running motor assembly 3.
In sum, pilot control system of novel hydraulic excavator of the present invention can keep switching the pressure stability of pipeline, avoids other original paper to be subject to the impact of hydraulic impulse, for the running motor variable provides electrodeless controlled pressure, realize the multi-stage variable of running motor, safe and reliable.
More than specific embodiments of the invention are described in detail, but the present invention is not restricted to specific embodiment described above, it is just as example.To those skilled in the art, any equivalent modifications that this pilot control system of novel hydraulic excavator is carried out and substituting also all among category of the present invention.Therefore, not breaking away from impartial conversion and the modification of having done under the spirit and scope of the present invention, all should contain within the scope of the invention.
Claims (3)
1. pilot control system of novel hydraulic excavator, comprise the first precursor overflow valve, hydraulic pump, the second precursor overflow valve, one end of hydraulic pump one end and the second precursor overflow valve also connects, be connected in series with the first precursor overflow valve one end, the other end stretches into fuel tank with the other end of the second precursor overflow valve, the first precursor overflow valve and the second precursor overflow valve are all with thermoregulator, it is characterized in that, also comprise controller and accumulator, the described first precursor overflow valve other end is connected with the running motor assembly by a solenoid-operated proportional reducing valve after accumulator connects with being connected, and described solenoid-operated proportional reducing valve is connected with described controller; Described controller need to be walked when switching to definite value electric current of described solenoid-operated proportional reducing valve at hydraulic crawler excavator, make described solenoid-operated proportional reducing valve that pilot pressure is reduced to set pressure, and export to the running motor assembly, when the downstream pressure of described solenoid-operated proportional reducing valve surpasses described set pressure, described solenoid-operated proportional reducing valve spool can be connected its delivery outlet and described fuel tank, too high pressure is let out described fuel tank, to keep the constant of downstream pressure.
2. hydraulic crawler excavator pilot control system according to claim 1, it is characterized in that, change described controller and input the value of the described definite value electric current of described solenoid-operated proportional reducing valve, the pressure that the output of described solenoid-operated proportional reducing valve is different is with the different requirements of the variable that satisfies the running motor assembly.
3. hydraulic crawler excavator pilot control system according to claim 2 is characterized in that, the scope of the value of the pressure that described solenoid-operated proportional reducing valve output is different is to pilot system pressure from zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110158637XA CN102251547B (en) | 2011-06-14 | 2011-06-14 | Pilot control system of novel hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110158637XA CN102251547B (en) | 2011-06-14 | 2011-06-14 | Pilot control system of novel hydraulic excavator |
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| CN102251547A CN102251547A (en) | 2011-11-23 |
| CN102251547B true CN102251547B (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110158637XA Expired - Fee Related CN102251547B (en) | 2011-06-14 | 2011-06-14 | Pilot control system of novel hydraulic excavator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108729491A (en) * | 2018-05-24 | 2018-11-02 | 柳州柳工挖掘机有限公司 | Crawler-mounted excavator traveling control system and control method |
| CN108755829A (en) * | 2018-05-24 | 2018-11-06 | 柳州柳工挖掘机有限公司 | Crawler-mounted excavator turns to automatic gear shifting control system and control method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195124B (en) * | 2013-04-03 | 2015-09-23 | 徐州徐工挖掘机械有限公司 | A kind of excavator return oil pressure control loop |
| CN115012471B (en) * | 2022-06-21 | 2023-11-14 | 柳州柳工挖掘机有限公司 | Method and system for weighing excavated materials, excavator controller and excavator |
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| JP2007303543A (en) * | 2006-05-11 | 2007-11-22 | Nabtesco Corp | Variable hydraulic motor driving device |
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| WO2008023516A1 (en) * | 2006-08-24 | 2008-02-28 | Komatsu Ltd. | Fan drive system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108729491A (en) * | 2018-05-24 | 2018-11-02 | 柳州柳工挖掘机有限公司 | Crawler-mounted excavator traveling control system and control method |
| CN108755829A (en) * | 2018-05-24 | 2018-11-06 | 柳州柳工挖掘机有限公司 | Crawler-mounted excavator turns to automatic gear shifting control system and control method |
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| CN102251547A (en) | 2011-11-23 |
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