CN101775822B - Excavator swing arm descending hydraulic control loop - Google Patents

Excavator swing arm descending hydraulic control loop Download PDF

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Publication number
CN101775822B
CN101775822B CN2009102154592A CN200910215459A CN101775822B CN 101775822 B CN101775822 B CN 101775822B CN 2009102154592 A CN2009102154592 A CN 2009102154592A CN 200910215459 A CN200910215459 A CN 200910215459A CN 101775822 B CN101775822 B CN 101775822B
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CN
China
Prior art keywords
swing arm
valve
operated directional
way
oil
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CN2009102154592A
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Chinese (zh)
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CN101775822A (en
Inventor
张博友
胡学军
陈志强
张军荣
李兵
李小亮
张玮
夏金玲
曲海斌
胡月平
刘靖宇
周文涛
李亮宇
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福田雷沃国际重工股份有限公司
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Priority to CN2009102154592A priority Critical patent/CN101775822B/en
Publication of CN101775822A publication Critical patent/CN101775822A/en
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Publication of CN101775822B publication Critical patent/CN101775822B/en

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Abstract

The invention discloses an excavator swing arm descending hydraulic control loop. The key points of design are as follows: an electromagnetic directional valve is arranged between a servo variable mechanism of a emission variable hydraulic pump and an oil outlet of a swing arm descending manual pilot valve; a hydraulic controlled electric contact pressure switch is arranged on the connecting pipeline between a rodless cavity of a swing arm cylinder and a swing arm two-way hydraulic controlled directional valve, and the electric contact pressure switch is electrically connected with the electromagnetic directional valve; the spool of the swing arm two-way hydraulic controlled directional valve is provided with a compensation channel, and the compensation channel is internally provided with a one-way valve. When the swing arm descends, under actions of the swing arm and the load gravity thereof, hydraulic oil supposed to flow back to an oil tank enters into a rod cavity quickly via the compensation channel, while the emission variable hydraulic pump maintains in the lowest emission state, thus reducing power consumption, lowering system oil temperature and saving energy. And when the swing arm descends too quickly or the bucket nearly touches with the ground, the air suction phenomenon is avoided from occurring, and the swing arm cylinder is under reliable control all the time.

Description

Excavator swing arm descending hydraulic control loop

Technical field

The present invention relates to a kind of excavator hydraulic system, relate in particular to a kind of excavator swing arm descending hydraulic control loop.

Background technology

Positive flow control system is more and more used at medium-and-large-sized excavator, so-called positive flow control system is with in the past minus flow control system, positive flow control system is meant that the hydraulic pressure pump delivery is directly proportional with the signal pressure of pilot operated handle output, master controller is judged the traffic demand and the variation tendency thereof of actuator according to pilot pressure signal and variation tendency thereof, and in view of the above hydraulic pump discharge is implemented to regulate, and the flow supply of system can the dynamic following executive component traffic demand, realize the real-time coupling of flow system flow, just " gained is promptly required ".

According to positive flow principle, when manipulation guide handle carried out the swing arm step-down operation, hydraulic pump can retrieve pilot signal made its pivot angle become big, and discharge capacity increases.And in fact, swing arm relies on the power conversion of deadweight generation and the regeneration function of swing arm change-over valve core, can realize the course of action that swing arm descends substantially, provides unnecessary flow and need not hydraulic pump.So-called " regeneration " is meant, a compensation channels is set on the spool of reversal valve, in described compensation channels, be provided with one way valve, when described reversal valve is in the working position of the rod chamber fuel feeding rodless cavity oil return that makes boom cylinder, described compensation channels is communicated with the interior oil supply gallery and the drainback passage of valve body of reversal valve, so originally, the hydraulic oil that flows back to fuel tank enters rod chamber rapidly, play acceleration, utilize the effect of self gravitation potential energy, thereby reduce the energy consumption of pump, this acting on is called " regeneration " in the industry visually.If when this moment, hydraulic pump discharge continued to become big, not only can cause the waste of energy, also can bring bad phenomenon such as system's heating.

If cut off the oil circuit that is connected of swing arm decline pilot signal and hydraulic pump, making swing arm decline rely on the weight of self to regulate fully realizes, but so also can run into following problem: at first, when swing arm descends when too fast, the oil mass of regeneration is unable to catch up with the speed that swing arm descends far away, and this is unallowed can to cause the swing arm rod chamber to produce negative pressure (being emptying phenomenon); Secondly, during the scraper bowl kiss the earth, often also can do the action that swing arm descends and realize supportting the operating mode on car, level land etc., yet the conversion of no longer carrying out potential energy and hydraulic pressure energy this moment reaches the rod chamber fuel feeding of boom cylinder.And hydraulic pump is because be connected the disconnection of oil circuit with swing arm decline pilot signal, do not receive needs to increase discharge capacity at all, give the instruction of boom cylinder rod chamber fuel feeding, though this moment, guide's handle sent the instruction that swing arm descends, the boom cylinder of having no alternative can not move.

Summary of the invention

Technical problem to be solved by this invention is: a kind of excavator swing arm descending hydraulic control loop is provided, this hydraulic control circuit has not only reduced power consumption, reduced the system oil temperature, reached energy-saving effect, and descend too fast or scraper bowl when contacting to earth at swing arm, can prevent the generation of emptying phenomenon and boom cylinder is under the reliable control all the time.

For solving the problems of the technologies described above, technical scheme of the present invention is: excavator swing arm descending hydraulic control loop comprises two-way pilot operated directional control valve of change displacement hydraulic pump, swing arm and the boom cylinder by the servo variable mechanism control that connect by pipeline; Be used to control swing arm that boom cylinder the descends manual pilot valve that descends, the descend oil-out of manual pilot valve of described swing arm is communicated with a control port of the two-way pilot operated directional control valve of described swing arm; The spool of the two-way pilot operated directional control valve of described swing arm is provided with a compensation channels, in described compensation channels, be provided with one way valve, when the two-way pilot operated directional control valve of described swing arm was in the working position of the rod chamber fuel feeding rodless cavity oil return that makes boom cylinder, described compensation channels was communicated with the interior oil supply gallery and the drainback passage of valve body of the two-way pilot operated directional control valve of described swing arm; Described servo variable mechanism and described swing arm descend and are provided with solenoid operated directional valve between the oil-out of manual pilot valve; The connecting line of the rodless cavity of described boom cylinder and the two-way pilot operated directional control valve of swing arm is provided with the electric contact pressure switch by fluid power control, and described electric contact pressure switch is electrically connected with described solenoid operated directional valve.

As a kind of improvement, the two-way pilot operated directional control valve of described swing arm is three six pass two-way pilot operated directional control valves.

As further improvement, described solenoid operated directional valve is the two-position three way solenoid operated directional valve.

After having adopted technique scheme, the invention has the beneficial effects as follows: be provided with solenoid operated directional valve between the oil-out of manual pilot valve because described servo variable mechanism and described swing arm descend; The connecting line of the rodless cavity of described boom cylinder and the two-way pilot operated directional control valve of swing arm is provided with the electric contact pressure switch by fluid power control, described electric contact pressure switch is electrically connected with described solenoid operated directional valve, so, in the process that swing arm descends, under the effect of swing arm and load gravity thereof, make the hydraulic oil that flows back to fuel tank originally enter rod chamber rapidly by the compensation channels on the two-way liquid controlled reversing valve core of described swing arm, maintain the lowest displacement state and become displacement hydraulic pump, thereby reduced power consumption, reduce the system oil temperature, reached energy-saving effect.Moreover, when swing arm descends too fast or scraper bowl when contacting to earth, interlock by electric contact pressure switch and solenoid operated directional valve, automatically recover becoming the control of displacement hydraulic pump, rodless cavity to boom cylinder increases discharge capacity rapidly, prevents the generation of emptying phenomenon and boom cylinder is under the reliable control all the time.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Accompanying drawing is an embodiment of the invention hydraulic principle schematic diagram;

Among the figure: 1, electric contact pressure switch, 2, boom cylinder, 3, the two-way pilot operated directional control valve of swing arm, 4, hydraulic control one-way valve, 5, the swing arm manual pilot valve that descends, 6, solenoid operated directional valve, 7, become displacement hydraulic pump.

The specific embodiment

As shown in drawings, a kind of excavator swing arm descending hydraulic control loop comprises two-way pilot operated directional control valve 3 of change displacement hydraulic pump 7, swing arm and the boom cylinder 2 by the servo variable mechanism control that connect by pipeline.

Described servo variable mechanism is a kind of known mechanism, its common structure is that a servo piston is set in housing, described servo piston is connected with a swash plate by hinge, when hydraulic oil promotion piston moves, can change the size of swash plate pivot angle, thereby change the discharge capacity that becomes displacement hydraulic pump 7.

The two-way pilot operated directional control valve 3 of described swing arm is preferably three the six pass two-way pilot operated directional control valves (so-called " regeneration " is referring to second section of background technology part) with regeneration function, the spool of described three six pass two-way pilot operated directional control valves is provided with a compensation channels, in described compensation channels, be provided with one way valve, when described three six pass two-way pilot operated directional control valves were in the working position of the rod chamber fuel feeding rodless cavity oil return that makes boom cylinder, described compensation channels was communicated with the interior oil supply gallery and the drainback passage of valve body of three six pass two-way pilot operated directional control valves.

The decline of boom cylinder 2 is by swing arm manual pilot valve 5 controls that descend, and the descend oil-out of manual pilot valve 5 of described swing arm is communicated with a control port of the two-way pilot operated directional control valve 3 of described swing arm; Described servo variable mechanism and described swing arm descend and are provided with solenoid operated directional valve 6 between the oil-out of manual pilot valve 5, and described solenoid operated directional valve 6 is preferably the two-position three way solenoid operated directional valve.The pilot pressure control that the stroke of the servo piston of described servo variable mechanism is provided by solenoid operated directional valve 6, when the pilot pressure that retrieves is zero, swash plate pivot angle minimum, the flow that becomes displacement hydraulic pump 7 supplies is minimum, after retrieving pilot pressure change greatly, the swash plate pivot angle increases, and the flow that becomes displacement hydraulic pump 7 supplies increases.

The connecting line of the two-way pilot operated directional control valve 3 of the rodless cavity of described boom cylinder 2 and swing arm is provided with the electric contact pressure switch 1 by fluid power control, and described electric contact pressure switch 1 is electrically connected with described solenoid operated directional valve 6.When the pressure that receives when electric contact pressure switch 1 was lower than setting value, electric contact pressure switch 1 was kept off-state, and solenoid operated directional valve 6 must not electricity, thereby makes guide's oil circuit of the described servo variable mechanism of control keep being communicated with.When the pressure that receives when electric contact pressure switch 1 is higher than setting value, electric contact pressure switch 1 closure, solenoid operated directional valve 6 electric realization commutation, guide's oil circuit of controlling described servo variable mechanism disconnects.

In addition, be provided with a hydraulic control one-way valve 4 between the two-way pilot operated directional control valve 3 of the rodless cavity of boom cylinder 2 and swing arm, the control end of hydraulic control one-way valve 4 and the swing arm manual pilot valve 5 that descends is communicated with.The swing arm manual pilot valve 5 that descends does not send when instruction, no guide's oil pressure, and at this moment, hydraulic control one-way valve 4 can't be opened, and the interior hydraulic oil of boom cylinder 2 rodless cavities can't oil return, thereby has strengthened safe application performance.

Its operating principle is as follows:

When pulling control crank and make swing arm descend 5 actions of manual pilot valve, guide oil is supplied with the swing arm decline guide end of the two-way pilot operated directional control valve 3 of swing arm, the two-way pilot operated directional control valve 3 of swing arm is in the working position of the rod chamber fuel feeding rodless cavity oil return that makes boom cylinder 2, become displacement hydraulic pump 7 hydraulic oil is sent into the rod chamber of boom cylinder 2, realize that swing arm descends.

When swing arm descends (scraper bowl does not drop down onto ground), draw through the test of many times test, when if the rodless cavity return pressure of boom cylinder 2 is not less than the pressure that electric contact pressure switch 1 sets, electric contact pressure switch 1 closure, make solenoid operated directional valve 6 commutations, cut off guide's oil circuit of servo variable mechanism, thereby make the discharge capacity that becomes displacement hydraulic pump 7 reduce to minimum, at this moment, under the effect of swing arm and load gravity thereof, hydraulic oil in part boom cylinder 2 rodless cavities is opened the one way valve in the two-way pilot operated directional control valve 3 spool compensation channels of swing arm, compensate to the rod chamber of boom cylinder 2 rapidly, make boom cylinder 2 rely on the hydraulic oil of this part compensation to realize normal decline.In the process that swing arm descends, owing to given full play to the compensating action of rodless cavity backhaul hydraulic oil, make change displacement hydraulic pump 7 maintain the lowest displacement state, thereby reduced power consumption, reduced the system oil temperature, reached energy-saving effect.

When the too fast return pressure that descends during less than setting pressure, electric contact pressure switch 1 disconnects, solenoid operated directional valve 6 dead electricity, thereby recover to connect the oil circuit that becomes between displacement hydraulic pump 7 and the pilot valve, becoming displacement hydraulic pump 7 can provide the rod chamber of required oil mass to boom cylinder 2 according to guide's instruction, prevents the generation of emptying phenomenon.

After scraper bowl falls earthward, as the rod chamber oil-feed that still needs boom cylinder 2, when the rodless cavity oil return realizes moving, because the power conversion disappearance that swing arm descended and produced this moment, it is very low that return pressure becomes, electric contact pressure switch 1 is in off-state, pilot pressure is connected to the oil circuit that becomes displacement hydraulic pump 7, becomes the increase that displacement hydraulic pump 7 realizes discharge capacity, provides hydraulic oil to realize action to the rod chamber of boom cylinder 2.Thereby boom cylinder 2 is under the reliable control all the time.

The present invention is not limited to above-mentioned concrete embodiment, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done all drop within protection scope of the present invention.

Claims (3)

1. excavator swing arm descending hydraulic control loop comprises
Two-way pilot operated directional control valve of change displacement hydraulic pump, swing arm and boom cylinder by the pipeline connection by servo variable mechanism control; Be used to control swing arm that boom cylinder the descends manual pilot valve that descends, the descend oil-out of manual pilot valve of described swing arm is communicated with a control port of the two-way pilot operated directional control valve of described swing arm; It is characterized in that:
The spool of the two-way pilot operated directional control valve of described swing arm is provided with a compensation channels, in described compensation channels, be provided with one way valve, when the two-way pilot operated directional control valve of described swing arm was in the working position of the rod chamber fuel feeding rodless cavity oil return that makes boom cylinder, described compensation channels was communicated with the interior oil supply gallery and the drainback passage of valve body of the two-way pilot operated directional control valve of described swing arm;
Described servo variable mechanism and described swing arm descend and are provided with solenoid operated directional valve between the oil-out of manual pilot valve;
The connecting line of the rodless cavity of described boom cylinder and the two-way pilot operated directional control valve of swing arm is provided with the electric contact pressure switch by fluid power control, and described electric contact pressure switch is electrically connected with described solenoid operated directional valve.
2. excavator swing arm descending hydraulic control loop as claimed in claim 1 is characterized in that: the two-way pilot operated directional control valve of described swing arm is three six pass two-way pilot operated directional control valves.
3. excavator swing arm descending hydraulic control loop as claimed in claim 1 is characterized in that: described solenoid operated directional valve is the two-position three way solenoid operated directional valve.
CN2009102154592A 2009-12-31 2009-12-31 Excavator swing arm descending hydraulic control loop CN101775822B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009102154592A CN101775822B (en) 2009-12-31 2009-12-31 Excavator swing arm descending hydraulic control loop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009102154592A CN101775822B (en) 2009-12-31 2009-12-31 Excavator swing arm descending hydraulic control loop

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CN101775822A CN101775822A (en) 2010-07-14
CN101775822B true CN101775822B (en) 2011-12-07

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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102061714B (en) * 2010-12-03 2012-10-17 三一重机有限公司 Control method for descending movable arm of excavator
CN102102370B (en) * 2010-12-08 2012-06-27 太原重工股份有限公司 Lowing control system for movable arm of hydraulic excavator for mines
CN102588359B (en) * 2012-02-28 2014-10-22 上海中联重科桩工机械有限公司 Hydraulic system, excavator and control method of hydraulic system
CN102852186B (en) * 2012-09-27 2014-10-22 太原重工股份有限公司 Hydraulic device for preventing movable arm of hydraulic excavator from falling accidently
CN102995680B (en) * 2012-12-04 2015-03-11 山河智能装备股份有限公司 Hydraulic bucket rod control circuit for hydraulic excavating machine
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
GB2514112C (en) * 2013-05-13 2016-11-30 Caterpillar Inc Valve Arrangement
CN103469847A (en) * 2013-09-26 2013-12-25 镇江金天辰新材料有限公司 Emergency falling system of movable arm of loader
JP6247123B2 (en) * 2014-03-19 2017-12-13 ナブテスコ株式会社 Hydraulic circuit for construction machinery
CN104986675B (en) * 2015-07-02 2017-06-30 浙江三一装备有限公司 A kind of luffing range of cantilever support hydraulic system and crane

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Owner name: QINGDAO LEIWO EXCAVATOR CO., LTD.

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Address before: 261206 Beihai South Road, Fangzi District, Shandong, No. 192, No.

Patentee before: Futian Leiwo International Heavy Industry Co., Ltd.

Effective date of registration: 20140827

Address after: 266500, No. 75 east the Yellow River Road, Huangdao economic and Technological Development Zone, Qingdao, Shandong

Patentee after: QINGDAO LEIWO EXCAVATOR CO., LTD.

Address before: 261206 Beihai South Road, Fangzi District, Shandong, No. 192, No.

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Address after: 266500, No. 75 east the Yellow River Road, Huangdao economic and Technological Development Zone, Qingdao, Shandong

Patentee after: Qingdao leiwo Engineering Machinery Co. Ltd.

Address before: 266500, No. 75 east the Yellow River Road, Huangdao economic and Technological Development Zone, Qingdao, Shandong

Patentee before: QINGDAO LEIWO EXCAVATOR CO., LTD.

Address after: 266500, No. 75 east the Yellow River Road, Huangdao economic and Technological Development Zone, Qingdao, Shandong

Patentee after: Qingdao leiwo Engineering Machinery Co. Ltd.

Address before: 266500, No. 75 east the Yellow River Road, Huangdao economic and Technological Development Zone, Qingdao, Shandong

Patentee before: QINGDAO LEIWO EXCAVATOR CO., LTD.

CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: 266500, No. 75 east the Yellow River Road, Huangdao economic and Technological Development Zone, Qingdao, Shandong

Patentee after: LOVOL Engineering Machinery Group Co., Ltd

Address before: 266500, No. 75 east the Yellow River Road, Huangdao economic and Technological Development Zone, Qingdao, Shandong

Patentee before: Qingdao leiwo Engineering Machinery Co. Ltd.