CN102296666B - Pilot buffer device of excavator hydraulic motor - Google Patents

Pilot buffer device of excavator hydraulic motor Download PDF

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Publication number
CN102296666B
CN102296666B CN 201110171345 CN201110171345A CN102296666B CN 102296666 B CN102296666 B CN 102296666B CN 201110171345 CN201110171345 CN 201110171345 CN 201110171345 A CN201110171345 A CN 201110171345A CN 102296666 B CN102296666 B CN 102296666B
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CN
China
Prior art keywords
valve
hydraulic
control
way valve
hydraulic control
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CN 201110171345
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Chinese (zh)
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CN102296666A (en
Inventor
王伟耀
牛选平
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中外合资沃得重工(中国)有限公司
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Priority to CN 201110171345 priority Critical patent/CN102296666B/en
Publication of CN102296666A publication Critical patent/CN102296666A/en
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Publication of CN102296666B publication Critical patent/CN102296666B/en

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Abstract

The invention discloses a pilot buffer device of an excavator hydraulic motor, which comprises a hydraulic motor, a three-position six-way hydraulic changeover valve, an operation handle, a first control valve, a second control valve and a pilot buffer valve, wherein the pilot buffer valve comprises a first hydraulic control one-way valve and a second hydraulic control one-way valve, a first throttling valve and a second throttling valve; the first hydraulic control one-way valve and the second hydraulic control one-way valve are respectively connected with the first throttling valve and the second throttling valve in parallel, and hydraulic ends of the first hydraulic control one-way valve and the second hydraulic control one-way valve are interlocked. In the invention, a multi-valve combined pilot buffer valve with a compact structure is additionally provided, when the operation handle returns to a neutral position, returned oil at one end of a valve plug of the three-position six-way hydraulic changeover valve is subjected to damping action, the moving speed of the valve plug is reduced, the speed of the hydraulic motor is slowly reduced, therefore, impact and vibration to a hydraulic system when the hydraulic motor is suddenly stopped are avoided, the reliability of the excavator hydraulic system is improved, the service life of hydraulic elements is prolonged, and an excavator is convenient and accurate in throwing soil.

Description

Hydraulic motor pilot buffering device for excavator

Technical field

The present invention relates to a kind of equipment of excavator, the buffer when especially a kind of digger revolving stops to belong to technical field of engineering machinery.

Background technology

Excavator is widely used in the fields such as civil engineering, waterpower, electric power, road traffic, mine, harbour and defence construction, during excavator work, boom cylinder, bucket arm cylinder and bucket cylinder are coordinated with each other flexible, finish the different construction operations such as excavation, lifting, loading, smooth, soil-shifting, impact grinding.During digging operation, scraper bowl fetches earth first, and then fluid motor-driven excavator main body drives swing arm, dipper turns to the precalculated position, and bucket cylinder drives scraper bowl and gets rid of soil.Existing excavator hydraulic motor slewing equipment adopts three six logical hydraulicchange-over valves directly to control startup, revolution and the parking of hydraulic motor, when excavator main body drive swing arm, when dipper turns to the precalculated position, operating grip is got back to meta, three six logical hydraulicchange-over valve spool one end oil-feeds, promote spool and arrive fast meta, because this moment, the valve body hydraulic fluid port all sealed, hydraulic motor stops suddenly, hydraulic oil produces the impact of water hammer effect to hydraulic system, oil pipe produces judder, increased the hydraulic system fault odds, also affected scraper bowl simultaneously and get rid of soil.

Summary of the invention

Purpose of the present invention overcomes the deficiencies in the prior art, and a kind of hydraulic motor pilot buffering device for excavator is provided, and when avoiding hydraulic motor to stop hydraulic system is produced shock and vibration, reduces the fault rate of excavator hydraulic system, improves scraper bowl and gets rid of native efficient.

The present invention is achieved by the following technical programs:

A kind of hydraulic motor pilot buffering device for excavator, comprise hydraulic motor, three six logical hydraulicchange-over valves, operating grip, the first control valve, the second control valve and guide's trimmer valve, described operating grip lower end is fixedly connected with operation board, operation board center and axle are hinged, the operation board both sides respectively with the first control valve, the second control valve elasticity connects, the P1 end of the first control valve, T1 end respectively with the P2 end of the second control valve, the T2 end is corresponding linking to each other one by one, pressure oil oil-feed P end respectively with the P1 end of the first control valve, the P2 of the second control valve end links to each other, oil return T end respectively with the T1 end of the first control valve, the T2 end of the second control valve links to each other; A5 end, the B5 end of three six logical hydraulicchange-over valves link to each other with the two ends hydraulic fluid port of hydraulic motor respectively, and the P5 end of three six logical hydraulicchange-over valves links to each other with pressure oil oil-feed P end, and the T5 end links to each other with oil return T end; Described guide's trimmer valve is many valve assemblies, comprise the first hydraulic control one-way valve, the second hydraulic control one-way valve, first throttle valve, the second choke valve, described the first hydraulic control one-way valve is in parallel with the first throttle valve, the second hydraulic control one-way valve is in parallel with the second choke valve, the hydraulic control end interlocking of the first hydraulic control one-way valve and the second hydraulic control one-way valve; The A1 end of the first control valve links to each other with the A3 end of the first hydraulic control one-way valve by the first segment head piece of guide's trimmer valve, and the A2 end of the second control valve links to each other with the A4 end of the second hydraulic control one-way valve by the second section head piece of guide's trimmer valve; The B3 end of the first hydraulic control one-way valve links to each other with the D5 end that surges of three six logical hydraulicchange-over valves, and the B4 end of the second hydraulic control one-way valve links to each other with the E5 end that surges of three six logical hydraulicchange-over valves.

The present invention has set up guide's trimmer valve of many valve combinations, compact conformation in the interface channel of the first control valve, the second control valve and three six logical hydraulicchange-over valves.When operating grip is got back to meta, the oil return of spool one end of three six logical hydraulicchange-over valves is subject to the damping action of the first hydraulic control one-way valve or the second hydraulic control one-way valve band pressure compensation, the translational speed of spool also is restricted and descends, the speed of hydraulic motor also so mildly descends, thereby avoided hydraulic motor to stop suddenly hydraulic system has been produced shock and vibration, improve the reliability of excavator hydraulic system, prolonged the application life of hydraulic pressure components and parts.

When the promotion operating grip makes spool leave meta, because the first hydraulic control one-way valve of interlocking, the control mouth of the second hydraulic control one-way valve are opened by hydraulic oil respectively, be opened so that lead to the passage of the end that surges of three six logical hydraulicchange-over valves, the translational speed of spool from the meta to the working position is unrestricted, the startup of hydraulic motor does not have any delay, improve the operating efficiency of excavator, made swing arm and scraper bowl operational motion soft, got rid of soil accurately.

Advantage and disadvantage of the present invention will be for illustration and explanation by the non-limitative illustration of following preferred embodiment, and these embodiment only provide as an example with reference to accompanying drawing.

Description of drawings

Fig. 1 is hydraulic schematic diagram of the present invention.

The specific embodiment

The invention will be further described below in conjunction with drawings and Examples.

As shown in Figure 1, the present invention includes hydraulic motor 1, three six logical hydraulicchange-over valves 2, operating grip 3, the first control valve 4, the second control valve 5 and guide's trimmer valves 6, operating grip 3 lower ends are fixedly connected with operation board 31, operation board 31 centers and axle 32 are hinged, and operation board 31 both sides are connected by spring with the first control valve 4, the second control valve 5 respectively.Operating grip 3 shown in Figure 1 is in meta, the spool of three six logical hydraulicchange-over valves 2 also is in meta, the P1 end of the first control valve 4, T1 end are corresponding continuous one by one with P2 end, the T2 end of the second control valve 5 respectively, pressure oil oil-feed P end links to each other with the P1 end of the first control valve 4, the P2 end of the second control valve 5 respectively, and oil return T end links to each other with the T1 end of the first control valve 4, the T2 end of the second control valve 5 respectively.A5 end, the B5 end of three six logical hydraulicchange-over valves 2 link to each other with the two ends hydraulic fluid port of hydraulic motor 1 respectively, and the P5 end of three six logical hydraulicchange-over valves 2 links to each other with pressure oil oil-feed P end, and the T5 end links to each other with oil return T end.

Guide's trimmer valve 6 is many valve assemblies, comprise the first hydraulic control one-way valve 61, the second hydraulic control one-way valve 62, first throttle valve 63, the second choke valve 64, first segment head piece 65, second section head piece 66, the first hydraulic control one-way valve 61 is in parallel with first throttle valve 63, the second hydraulic control one-way valve 62 is in parallel with the second choke valve 64, the hydraulic control end interlocking of the first hydraulic control one-way valve 61 and the second hydraulic control one-way valve 62.The A1 end of the first control valve 4 links to each other with the A3 end of the first hydraulic control one-way valve 61 by the first segment head piece 65 of guide's trimmer valve 6, and the A2 end of the second control valve 5 links to each other with the A4 end of the second hydraulic control one-way valve 62 by the second section head piece 66 of guide's trimmer valve 6; The B3 end of the first hydraulic control one-way valve 61 links to each other with the D5 end that surges of three six logical hydraulicchange-over valves 2, and the B4 end of the second hydraulic control one-way valve 62 links to each other with the E5 end that surges of three six logical hydraulicchange-over valves 2.

When operating grip 3 is got back to meta, the spool of three six logical hydraulicchange-over valves 2 is also got back to meta from working position, the end oil return of surging of three six logical hydraulicchange-over valves 2 is subject to the first hydraulic control one-way valve 61 or the second hydraulic control one-way valve 62 with the damping action of pressure compensation, its translational speed descends, spool is slowly got back to meta, the speed of hydraulic motor 1 also mildly descends, thereby when having avoided hydraulic motor 1 to stop suddenly hydraulic system is produced shock and vibration.

Shown in curved arrow, promote to the right operating grip 3, move on the first control valve 4, pressure oil moves to left from the spools that first segment head piece the 65-the first hydraulic control one-way valve 61 by the first control valve 4-standard damping action of the P end-D5 that surges end promotes three six logical hydraulicchange-over valves 2, and the oil return of the E5 that surges end is by second section head piece the 66-the second control valve 5-T mouth oil sump tank of the second hydraulic control one-way valve 62-standard damping action of unlatching.P end pressure oil passes through one way valve 21, promotes hydraulic motor 1 rotation from three the six P5 mouths that lead to hydraulicchange-over valves 2 to the B5 mouth, and the oil return of hydraulic motor 1 is held oil sump tank to T from the A5 mouth of three six logical hydraulicchange-over valves 2 again to the T5 mouth.This moment, the translational speed of spool from the meta to the working position was unrestricted owing to the first hydraulic control one-way valve 61, the second hydraulic control one-way valve 62 all are in opening, and the startup of hydraulic motor 1 can not postpone,

In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.

Claims (1)

1. hydraulic motor pilot buffering device for excavator, comprise hydraulic motor, three six logical hydraulicchange-over valves, operating grip, the first control valve, the second control valve, described operating grip lower end is fixedly connected with operation board, operation board center and axle are hinged, the operation board both sides respectively with the first control valve, the second control valve elasticity connects, the P1 end of the first control valve, T1 end respectively with the P2 end of the second control valve, the T2 end is corresponding linking to each other one by one, pressure oil oil-feed P end respectively with the P1 end of the first control valve, the P2 of the second control valve end links to each other, oil return T end respectively with the T1 end of the first control valve, the T2 end of the second control valve links to each other; A5 end, the B5 end of three six logical hydraulicchange-over valves link to each other with the two ends hydraulic fluid port of hydraulic motor respectively, and the P5 end of three six logical hydraulicchange-over valves links to each other with pressure oil oil-feed P end, and the T5 end links to each other with oil return T end; It is characterized in that, also comprise guide's trimmer valve, described guide's trimmer valve is many valve assemblies, comprise the first hydraulic control one-way valve, the second hydraulic control one-way valve, first throttle valve, the second choke valve, described the first hydraulic control one-way valve is in parallel with the first throttle valve, the second hydraulic control one-way valve is in parallel with the second choke valve, the hydraulic control end interlocking of the first hydraulic control one-way valve and the second hydraulic control one-way valve; The A1 end of the first control valve links to each other with the A3 end of the first hydraulic control one-way valve by the first segment head piece of guide's trimmer valve, and the A2 end of the second control valve links to each other with the A4 end of the second hydraulic control one-way valve by the second section head piece of guide's trimmer valve; The B3 end of the first hydraulic control one-way valve links to each other with the D5 end that surges of three six logical hydraulicchange-over valves, and the B4 end of the second hydraulic control one-way valve links to each other with the E5 end that surges of three six logical hydraulicchange-over valves.
CN 201110171345 2011-06-23 2011-06-23 Pilot buffer device of excavator hydraulic motor CN102296666B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201110171345 CN102296666B (en) 2011-06-23 2011-06-23 Pilot buffer device of excavator hydraulic motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201110171345 CN102296666B (en) 2011-06-23 2011-06-23 Pilot buffer device of excavator hydraulic motor

Publications (2)

Publication Number Publication Date
CN102296666A CN102296666A (en) 2011-12-28
CN102296666B true CN102296666B (en) 2013-03-06

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102788052A (en) * 2012-07-27 2012-11-21 柳工常州挖掘机有限公司 Oil changing and buffering device and pilot hydraulic control system with same
CN102788053B (en) * 2012-07-27 2015-09-02 柳州柳工挖掘机有限公司 Change oil and damping device and there is the pilot hydraulic control system of this device
CN105805075A (en) * 2016-05-31 2016-07-27 青岛雷沃挖掘机有限公司 Buffering loop avoiding influence on starting response and engineering machinery

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2878667Y (en) * 2005-12-26 2007-03-14 北京市三一重机有限公司 Rotary control system
JP4855852B2 (en) * 2006-07-04 2012-01-18 日立建機株式会社 Motor controller for construction machinery
CN201301466Y (en) * 2008-11-13 2009-09-02 贵州詹阳动力重工有限公司 Rotary oil supply loop for hydraulic excavator
CN101736771B (en) * 2010-02-05 2011-08-24 浙江大学 Rotary decelerating and braking energy recovery system of hydraulic excavator
CN202144601U (en) * 2011-06-23 2012-02-15 中外合资沃得重工(中国)有限公司 Hydraulic motor pilot buffering device for excavator

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