CN102733445B - Pilot oil source valve group for small-size hydraulic excavator - Google Patents
Pilot oil source valve group for small-size hydraulic excavator Download PDFInfo
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- CN102733445B CN102733445B CN201210242436.2A CN201210242436A CN102733445B CN 102733445 B CN102733445 B CN 102733445B CN 201210242436 A CN201210242436 A CN 201210242436A CN 102733445 B CN102733445 B CN 102733445B
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- valve
- port
- solenoid operated
- operated directional
- mouth
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- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses a pilot oil source valve group for a small-size hydraulic excavator, belonging to the technical field of a hydraulic valve group. The pilot oil source valve group comprises a one-way valve, a filter, a test joint, an overflow valve, a two-position two-way electromagnetic reversing valve and a two-position three-way electromagnetic reversing valve; a P port, a T port, an A port and a B port are arranged on the valve group; the P port is connected with the filter; the A port, the filter, the test joint, a first port of the overflow valve, a first port of the two-position two-way electromagnetic reversing valve and a first port of the two-position three-way electromagnetic reversing valve are manually communicated; the T port, a second port of the overflow valve, a second port of the two-position two-way electromagnetic reversing valve and a second port of the two-position three-way electromagnetic reversing valve are communicated; and a third port of the two-position three-way electromagnetic reversing valve is communicated with the B port. The pilot oil source valve group has the beneficial effects as follows: a pilot pump is effectively protected; the service life of the pilot pump is prolonged; and the oil consumption can be reduced, so that the cost is reduced.
Description
Technical field
The present invention relates to a kind of guide oil source valve group, specifically a kind of small type hydraulic excavator guide oil source valve group, belongs to hydraulic valve bank technical field.
Background technology
Small type hydraulic excavator is due to the consideration of space and cost at present, and a lot of hydraulic pilot systems are not used accumulator.The control of the guide oil source valve group that small type hydraulic excavator is used is normally controlled by two or three two-bit triplet solenoid operated directional valves; Because pioneer pump is constant displacement pump, so there is fluid to spue after engine start always, when excavator is not worked and during solenoid operated directional valve no signal, the fluid of pilot system can not directly flow back to fuel tank, need to flow back to fuel tank by the pressure limit of overflow valve, under this state, the pressure state that pilot system is set in overflow valve always, so both affect the life-span of pioneer pump, also had certain oil consumption loss.
Summary of the invention
The problem existing for above-mentioned prior art, the invention provides a kind of small type hydraulic excavator guide oil source valve group, effectively protects pioneer pump, extends the application life of pioneer pump, can reduce oil consumption, thereby reduce costs simultaneously.
To achieve these goals, the technical solution used in the present invention is: a kind of small type hydraulic excavator guide oil source valve group, comprise one way valve, strainer, test splice, overflow valve, 2/2-way solenoid operated directional valve and two-bit triplet solenoid operated directional valve, one way valve is connected in parallel on the two ends of strainer, valve group is provided with P mouth, T mouth, A mouth and B mouth, P mouth is connected with strainer, A mouth, strainer, test splice, 1 mouthful of overflow valve, between 1 mouthful of 1 mouthful of 2/2-way solenoid operated directional valve and two-bit triplet solenoid operated directional valve, be interconnected, T mouth, 2 mouthfuls of overflow valve, between 2 mouthfuls of 2 mouthfuls of 2/2-way solenoid operated directional valve and two-bit triplet solenoid operated directional valve, be interconnected, 3 mouthfuls of two-bit triplet solenoid operated directional valve are communicated with B mouth.
The invention has the beneficial effects as follows: the mode that adopts two-bit triplet solenoid operated directional valve and 2/2-way solenoid operated directional valve to combine; make the fluid of the hydraulic system of pioneer pump directly connect fuel tank; the pressure that the leading hydraulic system of having avoided leading oil source control valve group to control is set in overflow valve; simultaneously when excavator need to be worked; be that 2/2-way solenoid operated directional valve is while having signal; leading hydraulic system pressure is in relief valve set pressure; pilot control element is normally worked; effectively protect guide's hydraulic pump, saved fuel consume simultaneously.
Accompanying drawing explanation
Fig. 1 is hydraulic principle schematic diagram of the present invention.
In figure: 1, one way valve, 2, strainer, 3, test splice, 4, overflow valve, 5,2/2-way solenoid operated directional valve, 6, two-bit triplet solenoid operated directional valve.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, a kind of small type hydraulic excavator guide oil source valve group, comprise one way valve 1, strainer 2, test splice 3, overflow valve 4, 2/2-way solenoid operated directional valve 5 and two-bit triplet solenoid operated directional valve 6, one way valve 1 is in parallel with strainer 2, valve group is provided with P mouth, T mouth, A mouth and B mouth, P mouth is connected with strainer 2, A mouth, strainer 2, test splice 3, 1 mouthful of overflow valve 4, between 1 mouthful of 1 mouthful of 2/2-way solenoid operated directional valve 5 and two-bit triplet solenoid operated directional valve 6, be interconnected, T mouth, 2 mouthfuls of overflow valve 4, between 2 mouthfuls of 2 mouthfuls of 2/2-way solenoid operated directional valve 5 and two-bit triplet solenoid operated directional valve 6, be interconnected, 3 mouthfuls of two-bit triplet solenoid operated directional valve 6 are communicated with B mouth.
When the pressure reduction at strainer 2 two ends is greater than one way valve 1 opening pressure, pilot pressure oil can, by one way valve 1, clean or more before renew cartridge, hydraulic pilot system be played a protective role driver.
Wherein P mouth outside connects pioneer pump, the outside fuel tank that connects of T mouth, and A mouth outside is connected to the oil-in of pilot control element, and B mouth is outside to be communicated with the control port of running motor speed change.
The course of work: when 2/2-way solenoid operated directional valve 5 no signal normality, under spring action, 2/2-way solenoid operated directional valve 5 is in left position duty, 2 mouthfuls of 2/2-way solenoid operated directional valve 5 are communicated with and get back to fuel tank with T mouth, and 1 mouthful of 2/2-way solenoid operated directional valve 5 is connected with the oil circuit of pioneer pump by after strainer 2; When 2/2-way solenoid operated directional valve 5 has signal, 2/2-way solenoid operated directional valve 5 is in right position duty, 1 mouthful of 2/2-way solenoid operated directional valve 5 with 2/2-way solenoid operated directional valve 52 mouthful disconnect, by overflow valve 4 restriction maximum pressures, test splice 3, two-bit triplet solenoid operated directional valve 61 mouthful is with the A mouth that is connected pilot control element oil-in in there being pressure state, and now this commutation process can be controlled pioneer pump fuel feeding.
When 2/2-way solenoid operated directional valve 5 has signal, 1 mouthful of two-bit triplet solenoid operated directional valve 6 in having under the state of pressure, if during two-bit triplet solenoid operated directional valve 6 no signal normality, under the effect of spring force, two-bit triplet solenoid operated directional valve 6 is in left position duty, and now 2 of two-bit triplet solenoid operated directional valve 6 mouthfuls, 3 mouthfuls of two-bit triplet solenoid operated directional valve 6 are communicated with T mouth; When two-bit triplet solenoid operated directional valve 6 has signal, two-bit triplet solenoid operated directional valve 6 transfers right position duty to, 1 mouthful of two-bit triplet solenoid operated directional valve 6 with two-bit triplet solenoid operated directional valve 63 mouthful are communicated with, 3 mouthfuls of two-bit triplet solenoid operated directional valve 6 are communicated with pilot pressure oil by B mouth, mineralization pressure loop, now whole commutation process can be controlled the speed of running motor.
Claims (1)
1. a small type hydraulic excavator guide oil source valve group, comprise one way valve (1), strainer (2), test splice (3) and overflow valve (4), it is characterized in that, also comprise 2/2-way solenoid operated directional valve (5) and two-bit triplet solenoid operated directional valve (6), one way valve (1) is connected in parallel on the two ends of strainer (2), valve group is provided with P mouth, T mouth, A mouth and B mouth, P mouth is connected with strainer (2), A mouth, strainer (2), test splice (3), 1 mouthful of overflow valve (4), between 1 mouthful of 1 mouthful of 2/2-way solenoid operated directional valve (5) and two-bit triplet solenoid operated directional valve (6), be interconnected, T mouth, 2 mouthfuls of overflow valve (4), between 2 mouthfuls of 2 mouthfuls of 2/2-way solenoid operated directional valve (5) and two-bit triplet solenoid operated directional valve (6), be interconnected, 3 mouthfuls of two-bit triplet solenoid operated directional valve (6) are communicated with B mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210242436.2A CN102733445B (en) | 2012-07-12 | 2012-07-12 | Pilot oil source valve group for small-size hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210242436.2A CN102733445B (en) | 2012-07-12 | 2012-07-12 | Pilot oil source valve group for small-size hydraulic excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102733445A CN102733445A (en) | 2012-10-17 |
| CN102733445B true CN102733445B (en) | 2014-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210242436.2A Active CN102733445B (en) | 2012-07-12 | 2012-07-12 | Pilot oil source valve group for small-size hydraulic excavator |
Country Status (1)
| Country | Link |
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| CN (1) | CN102733445B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996554A (en) * | 2012-11-27 | 2013-03-27 | 龙工（上海）桥箱有限公司 | Pilot oil source valve for excavator |
| CN111550465B (en) * | 2020-05-15 | 2022-05-20 | 北京林克富华技术开发有限公司 | Control valve group |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05125746A (en) * | 1991-11-05 | 1993-05-21 | Kubota Corp | Hydraulic pilot circuit for working machine |
| CN201660918U (en) * | 2009-10-09 | 2010-12-01 | 广西玉柴重工有限公司 | Pilot control valve bank of miniature hydraulic excavating machine |
| CN201809801U (en) * | 2010-09-01 | 2011-04-27 | 中国一拖集团有限公司 | Control integration module of excavator hydraulic pilot oil source |
| CN102345650A (en) * | 2010-08-02 | 2012-02-08 | 黎伟雄 | Guide oil source valve group |
-
2012
- 2012-07-12 CN CN201210242436.2A patent/CN102733445B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05125746A (en) * | 1991-11-05 | 1993-05-21 | Kubota Corp | Hydraulic pilot circuit for working machine |
| CN201660918U (en) * | 2009-10-09 | 2010-12-01 | 广西玉柴重工有限公司 | Pilot control valve bank of miniature hydraulic excavating machine |
| CN102345650A (en) * | 2010-08-02 | 2012-02-08 | 黎伟雄 | Guide oil source valve group |
| CN201809801U (en) * | 2010-09-01 | 2011-04-27 | 中国一拖集团有限公司 | Control integration module of excavator hydraulic pilot oil source |
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| Publication number | Publication date |
|---|---|
| CN102733445A (en) | 2012-10-17 |
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