CN103255789A - Hydraulic circuit system for single-bucket hydraulic excavator - Google Patents
Hydraulic circuit system for single-bucket hydraulic excavator Download PDFInfo
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- CN103255789A CN103255789A CN2013101196274A CN201310119627A CN103255789A CN 103255789 A CN103255789 A CN 103255789A CN 2013101196274 A CN2013101196274 A CN 2013101196274A CN 201310119627 A CN201310119627 A CN 201310119627A CN 103255789 A CN103255789 A CN 103255789A
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Abstract
The invention discloses a hydraulic circuit system for a single-bucket hydraulic excavator. The hydraulic circuit system comprises a pressure-limiting circuit, a discharge circuit, a buffer circuit and a locking circuit. The pressure limiting-circuit comprises a reversing valve, two pressure-limiting valves and a boom cylinder. The discharge circuit comprises a three-position six-way valve. The buffer circuit comprises a buffer valve. The locking circuit comprises two check valves, a high-pressure chamber, a low-pressure chamber, a reversing valve and two buffer pressure-limiting valves. The pressure-limiting circuit, the discharge circuit, the buffer circuit and the locking circuit are sequentially connected. According to above arrangement, components can be well protected against being damaged by overload, and the hydraulic circuit system is reliable in working and stable in operation.
Description
Technical field
The present invention relates to the excavation machinery field, particularly relate to a kind of hydraulic circuit system of monobucket hydraulic crawler excavator.
Background technology
In the prior art, fundamental circuit is made up of one or several Hydraulic Elements, can finish the typical loop of specific simple function, and it is the component units of hydraulic system, and the pressure limiting loop is used for limiting pressure, makes it be no more than a certain setting.The purpose of pressure limiting is: the maximum pressure of system processed does not damage system and element because of overload.Usually realize that with safety valve safety valve is arranged near the oil pump oil-out.Usually realize with overflow valve that according to need of work overflow valve can make system according to set pressure work, unnecessary flow flows back to fuel tank by this valve, and therefore, overflow valve often leaves.Often be parallel with pressure limiting valve restriction hydraulic cylinder on the oil-feed of monobucket hydraulic crawler excavator executive component and the oil return loop in couples; the maximum of hydraulic motor under blocking closed eastern bank pressure; open if surpass this pressure pressure limiting valve, unload, protected Hydraulic Elements and pipeline to avoid damaging.The actual unloader that play a part of this pressure limiting valve.The set pressure of high-pressure system pressure limiting valve is no more than 25% of system pressure generally speaking, and the restriction pressure of the pressure limiting valve of mesohigh system can be more than 25%, native system operating pressure 25Mpa.The highest pressure limiting 25X125%=31.25Mpa.
Relief circuit is that each mechanism of excavator is not when working, hydraulic pump is dallied with lowest power consumption as far as possible, rather than the overflow oil return unloading way that often adopts hydraulic pump to dally with minimum pressure, according to the loop composition form, the off-load of reversal valve meta is arranged and pass through reversal valve off-load survival kind mode.The off-load of reversal valve meta is usually used in the high-pressure series system of excavator, be characterized in simple in structure, but if flow is very big, reversal valve is subjected to impacting bigger, handle unstable, in passing through the reversal valve relief circuit, employing had three six-way valves of oily path, and valve is crossed oily path and cut off when the operating position, valve is when meta, work oil with the minimum pressure order by and the oily path of mistake of reversal valve and off-load is usually used in mesohigh and high-voltage parallel system, reliable operation, handle steadily, can design the hydraulic circuit employing and pass through the reversal valve relief circuit.
Summary of the invention
The technical problem that the present invention mainly solves provides a kind of hydraulic circuit system, can not damage because of overload by the better protection element, and reliable operation is handled steadily.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: the hydraulic circuit system that a kind of monobucket hydraulic crawler excavator is provided, comprise the pressure limiting loop, relief circuit, buffer loop and locking loop, described pressure limiting loop comprises reversal valve, two pressure limiting valves and boom cylinder, described relief circuit comprises three six-way valves, described buffer loop comprises a trimmer valve, described locking loop comprises two one way valves, a high pressure chest, a low pressure chamber, a reversal valve and two buffering pressure limiting valves, described pressure limiting loop, relief circuit, connect in turn between buffer loop and the locking loop.。
In a preferred embodiment of the present invention, described two pressure limiting valves are connected in parallel over the ground.
In a preferred embodiment of the present invention, described trimmer valve is made with brass.
In a preferred embodiment of the present invention, described locking loop also comprises a hydraulic lock.
In a preferred embodiment of the present invention, described locking loop also comprises two sequence valves.
The invention has the beneficial effects as follows: hydraulic circuit of the present invention can better not damage because of overload by protecting component, and reliable operation is handled steadily.
Description of drawings
Fig. 1 is the pressure limiting loop schematic diagram of the hydraulic circuit system of monobucket hydraulic crawler excavator of the present invention;
Fig. 2 is the buffer loop schematic diagram of the hydraulic circuit system of monobucket hydraulic crawler excavator of the present invention;
The mark of each parts is as follows in the accompanying drawing: 1, reversal valve; 2, pressure limiting valve; 3, boom cylinder 4, high pressure chest; 5, low pressure chamber; 6, buffering pressure limiting valve; 7, one way valve.
The specific embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that protection scope of the present invention is made more explicit defining.
See also Fig. 1 and Fig. 2, the embodiment of the invention provides following technical scheme
In one embodiment, a kind of hydraulic circuit system of monobucket hydraulic crawler excavator, comprise pressure limiting loop, relief circuit, buffer loop and locking loop, described pressure limiting loop comprises reversal valve 1, two pressure limiting valves 2 and boom cylinder 3, described relief circuit comprises three six-way valves, described buffer loop comprises a trimmer valve, described locking loop comprises two one way valves 7, a high pressure chest 4, a low pressure chamber 5, a reversal valve 1 and two buffering pressure limiting valves 6, connects in turn between described pressure limiting loop, relief circuit, buffer loop and the locking loop.
Preferably, described two pressure limiting valves 2 are connected in parallel over the ground.
Preferably, described trimmer valve is made with brass.
Preferably, described locking loop also comprises a hydraulic lock.
Preferably, described locking loop also comprises two sequence valves.
The present invention has reached the better protection element and has not damaged because of overload by the setting of hydraulic circuit system, and reliable operation is handled effect stably.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes manual of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (5)
1. the hydraulic circuit system of a monobucket hydraulic crawler excavator, it is characterized in that, comprise pressure limiting loop, relief circuit, buffer loop and locking loop, described pressure limiting loop comprises reversal valve, two pressure limiting valves and boom cylinder, described relief circuit comprises three six-way valves, described buffer loop comprises a trimmer valve, described locking loop comprises two one way valves, a high pressure chest, a low pressure chamber, a reversal valve and two buffering pressure limiting valves, connects in turn between described pressure limiting loop, relief circuit, buffer loop and the locking loop.
2. the hydraulic circuit system of monobucket hydraulic crawler excavator according to claim 1 is characterized in that, described two pressure limiting valves are connected in parallel over the ground.
3. the hydraulic circuit system of monobucket hydraulic crawler excavator according to claim 1 is characterized in that, described trimmer valve is made with brass.
4. the hydraulic circuit system of monobucket hydraulic crawler excavator according to claim 1 is characterized in that, described locking loop also comprises a hydraulic lock.
5. the hydraulic circuit system of monobucket hydraulic crawler excavator according to claim 1 is characterized in that, described locking loop also comprises two sequence valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101196274A CN103255789A (en) | 2013-04-09 | 2013-04-09 | Hydraulic circuit system for single-bucket hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101196274A CN103255789A (en) | 2013-04-09 | 2013-04-09 | Hydraulic circuit system for single-bucket hydraulic excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103255789A true CN103255789A (en) | 2013-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101196274A Pending CN103255789A (en) | 2013-04-09 | 2013-04-09 | Hydraulic circuit system for single-bucket hydraulic excavator |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254399A (en) * | 1997-02-27 | 2000-05-24 | 日立建机株式会社 | Hydraulic drive device and direction switchover valve for hydraulic machine |
| JP2001012406A (en) * | 1999-06-28 | 2001-01-16 | Kobe Steel Ltd | Hydraulic circuit for working machine and hybrid working machine |
| JP2004360216A (en) * | 2003-06-02 | 2004-12-24 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Swing driving device for construction machinery |
| JP2009036351A (en) * | 2007-08-03 | 2009-02-19 | Kobelco Contstruction Machinery Ltd | Hydraulic traveling device |
| WO2012157510A1 (en) * | 2011-05-18 | 2012-11-22 | 日立建機株式会社 | Work machine |
| CN202751853U (en) * | 2012-06-28 | 2013-02-27 | 河北麦森钛白粉有限公司 | Improved type U-shaped pressure filter control system |
-
2013
- 2013-04-09 CN CN2013101196274A patent/CN103255789A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254399A (en) * | 1997-02-27 | 2000-05-24 | 日立建机株式会社 | Hydraulic drive device and direction switchover valve for hydraulic machine |
| JP2001012406A (en) * | 1999-06-28 | 2001-01-16 | Kobe Steel Ltd | Hydraulic circuit for working machine and hybrid working machine |
| JP2004360216A (en) * | 2003-06-02 | 2004-12-24 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Swing driving device for construction machinery |
| JP2009036351A (en) * | 2007-08-03 | 2009-02-19 | Kobelco Contstruction Machinery Ltd | Hydraulic traveling device |
| WO2012157510A1 (en) * | 2011-05-18 | 2012-11-22 | 日立建機株式会社 | Work machine |
| CN202751853U (en) * | 2012-06-28 | 2013-02-27 | 河北麦森钛白粉有限公司 | Improved type U-shaped pressure filter control system |
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Application publication date: 20130821 |