CN102733445A - Pilot oil source valve group for small-size hydraulic excavator - Google Patents
Pilot oil source valve group for small-size hydraulic excavator Download PDFInfo
- Publication number
- CN102733445A CN102733445A CN2012102424362A CN201210242436A CN102733445A CN 102733445 A CN102733445 A CN 102733445A CN 2012102424362 A CN2012102424362 A CN 2012102424362A CN 201210242436 A CN201210242436 A CN 201210242436A CN 102733445 A CN102733445 A CN 102733445A
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- valve
- port
- solenoid operated
- operated directional
- mouth
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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's oil sources valve group, specifically is a kind of small type hydraulic excavator guide oil sources valve group, belongs to the hydraulic valve bank technical field.
Background technology
Small type hydraulic excavator is owing to the consideration of space and cost at present, and a lot of hydraulic pilot systems do not use accumulator.The control of guide's oil sources 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 a constant displacement pump, thus there is fluid to spue after the engine start always, when excavator is not worked and during the solenoid operated directional valve no signal; The fluid of pilot system can not directly flow back to fuel tank; Need flow back to fuel tank through the pressure limit of overflow valve, under this state, pilot system is in the pressure state that overflow valve is set always; So both influenced the life-span of pioneer pump, certain oil consumption loss had also been arranged.
Summary of the invention
To the problem that above-mentioned prior art exists, the present invention provides a kind of small type hydraulic excavator guide oil sources valve group, protects pioneer pump effectively, prolongs the application life of pioneer pump, can reduce oil consumption simultaneously, thereby reduce cost.
To achieve these goals; The technical scheme that the present invention adopts is: a kind of small type hydraulic excavator guide oil sources 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; The valve group is provided with P mouth, T mouth, A mouth and B mouth, and the P mouth is connected with strainer, is interconnected between 1 mouthful of A mouth, strainer, test splice, overflow valve 1 mouthful, 1 mouthful of the 2/2-way solenoid operated directional valve and two-bit triplet solenoid operated directional valve; Be interconnected between 2 mouthfuls of T mouth, overflow valve 2 mouthfuls, 2 mouthfuls of the 2/2-way solenoid operated directional valve and two-bit triplet solenoid operated directional valve, 3 mouthfuls of two-bit triplet solenoid operated directional valve are communicated with the 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; Avoided guide's hydraulic system of guide's oil sources control valve group control to be in the pressure that overflow valve is set, simultaneously when excavator needs work, when promptly the 2/2-way solenoid operated directional valve has signal; Guide's hydraulic system pressure is in relief valve set pressure; Guide's control element operate as normal has been protected guide's hydraulic pump effectively, has saved fuel consume simultaneously.
Description of drawings
Fig. 1 is a hydraulic principle sketch map of the present invention.
Among the figure: 1, one way valve, 2, strainer, 3, test splice, 4, overflow valve, 5, the 2/2-way solenoid operated directional valve, 6, the two-bit triplet solenoid operated directional valve.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described further.
As shown in Figure 1; A kind of small type hydraulic excavator guide oil sources 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 parallelly connected with strainer 2; The valve group is provided with P mouth, T mouth, A mouth and B mouth, and the P mouth is connected with strainer 2, is interconnected between 1 mouthful of A mouth, strainer 2, test splice 3, overflow valve 41 mouthful, 1 mouthful of 2/2-way solenoid operated directional valve 5 and two-bit triplet solenoid operated directional valve 6; Be interconnected between 2 mouthfuls of T mouth, overflow valve 42 mouthfuls, 2 mouthfuls of 2/2-way solenoid operated directional valve 5 and two-bit triplet solenoid operated directional valve 6,3 mouthfuls of two-bit triplet solenoid operated directional valve 6 are communicated with the B mouth.
When the pressure reduction at strainer 2 two ends during greater than one way valve 1 opening pressure, pilot pressure oil can be through one way valve 1, cleans or more before the renew cartridge hydraulic pilot system is played a protective role the 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 guide's control element, and the 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 normalities; 2/2-way solenoid operated directional valve 5 is in position, left side duty under spring action; 2 mouthfuls of 2/2-way solenoid operated directional valve 5 are communicated with the T mouth gets back to fuel tank, and 1 mouthful of 2/2-way solenoid operated directional valve 5 links to each other with oil circuit through the pioneer pump behind the 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 is connected with 2 mouthfuls of disconnections of 2/2-way solenoid operated directional valve 5; Through overflow valve 4 restriction maximum pressures, test splice 3, two-bit triplet solenoid operated directional valve 61 mouthful is in the A mouth that is connected guide's control element oil-in has pressure state, and this commutation process can be controlled the pioneer pump fuel feeding at this moment.
When 2/2-way solenoid operated directional valve 5 has signal; 1 mouthful of two-bit triplet solenoid operated directional valve 6 is in and has under the pressure status; If during two-bit triplet solenoid operated directional valve 6 no signal normalities; Two-bit triplet solenoid operated directional valve 6 is in left side position duty under the effect of spring force, and this moment 2 mouthfuls of two-bit triplet solenoid operated directional valve 6, two-bit triplet solenoid operated directional valve 63 mouthfuls are communicated with the 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 through the B mouth, the formation pressure circuit, and whole commutation process can be controlled the speed of running motor at this moment.
Claims (1)
1. small type hydraulic excavator guide oil sources 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), and the valve group is provided with P mouth, T mouth, A mouth and B mouth; The P mouth is connected with strainer (2); Be interconnected between 1 mouthful of A mouth, strainer (2), test splice (3), overflow valve (4) 1 mouthful, 1 mouthful of 2/2-way solenoid operated directional valve (5) and two-bit triplet solenoid operated directional valve (6), be interconnected between 2 mouthfuls of T mouth, overflow valve (4) 2 mouthfuls, 2 mouthfuls of 2/2-way solenoid operated directional valve (5) and two-bit triplet solenoid operated directional valve (6), 3 mouthfuls of two-bit triplet solenoid operated directional valve (6) are communicated with the 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 true CN102733445A (en) | 2012-10-17 |
| CN102733445B CN102733445B (en) | 2014-12-03 |
Family
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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 |
|---|---|
| CN (1) | CN102733445B (en) |
Cited By (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 |
| CN111550465A (en) * | 2020-05-15 | 2020-08-18 | 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 |
Non-Patent Citations (1)
| Title |
|---|
| 任占海: "《冶金液压设备及其维护》", 30 June 2005, 冶金工业出版社 * |
Cited By (3)
| 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 |
| CN111550465A (en) * | 2020-05-15 | 2020-08-18 | 北京林克富华技术开发有限公司 | Control valve group |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102733445B (en) | 2014-12-03 |
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