CN202577439U - Secondary backpressure system of hydraulic excavator - Google Patents
Secondary backpressure system of hydraulic excavator Download PDFInfo
- Publication number
- CN202577439U CN202577439U CN 201220183442 CN201220183442U CN202577439U CN 202577439 U CN202577439 U CN 202577439U CN 201220183442 CN201220183442 CN 201220183442 CN 201220183442 U CN201220183442 U CN 201220183442U CN 202577439 U CN202577439 U CN 202577439U
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Abstract
The utility model discloses a secondary backpressure system of a hydraulic excavator. The secondary backpressure system of the hydraulic excavator comprises a working cylinder, a travel motor, a rotary motor, a multi-way directional valve, a bypass backpressure valve, a main backpressure valve, an oil cooler, and an oil tank, wherein an oil outlet of a main pump is communicated with an oil inlet of the multi-way directional valve, and the multi-way directional valve is communicated with a working port of the working cylinder, the travel motor, and the rotary motor. A return opening of the multi-way directional valve is communicated with the main backpressure valve and the bypass backpressure valve, the main backpressure valve is communicated with the oil tank, the bypass backpressure valve is communicated with the oil tank, and the main backpressure valve and the bypass backpressure valve are in parallel and return oil. Cracking pressure of the main backpressure valve is lower than that of the bypass backpressure valve. The secondary backpressure system of the hydraulic excavator is simple in structure, reliable in performance, convenient to arrange, and high in cost performance.
Description
Technical field
The utility model relates to a kind of hydraulic crawler excavator secondary back pressure system, and this system can make the hydraulic crawler excavator return oil pressure maintain in the normal range (NR) always, and the protection system parts are avoided damaging.
Background technology
Traditional method; Excavator hydraulic system for make the action soft be beneficial to the rotary motor repairing, oil return line can be provided with a counterbalance valve, makes oil return that certain back pressure arranged; This way has a defective; When some operation heightens recirculating oil quantity, when hydraulic oil viscosity becomes big (cold day initiating task), return oil pressure can be excessive, can badly damaged system unit.
Summary of the invention
The purpose of the utility model is to provide a kind of hydraulic crawler excavator return oil pressure that can make to maintain in the normal range (NR) always, and the hydraulic crawler excavator secondary back pressure system that the protection system parts are avoided damaging is simple in structure, makes easy, easy to use, safe and reliable.
The technical scheme of the utility model is: a kind of hydraulic crawler excavator secondary back pressure system; Comprise operating cylinder, running motor, rotary motor, multiple directional control valve, bypass counterbalance valve, main counterbalance valve, oil cooler, main pump, fuel tank; It is characterized in that main pump (8) oil-out is communicated with multiple directional control valve (4) oil-in; Multiple directional control valve (4) oil-out is communicated with operating cylinder (1), running motor (2), rotary motor (3) actuator port respectively; Multiple directional control valve (4) oil return opening is communicated with main counterbalance valve (6), bypass counterbalance valve (5) respectively, and main counterbalance valve (6) is communicated with fuel tank (9) through oil cooler (7), and bypass counterbalance valve (5) is communicated with fuel tank (9).
Main counterbalance valve (6) and the parallelly connected oil return of bypass counterbalance valve (5).
The utility model has the advantages that: simple in structure, dependable performance, arrangement convenience, cost performance is high, has solved hydraulic crawler excavator when some operation recirculating oil quantity heightens, when hydraulic oil viscosity becomes big, and the ultra in short-term scope of return oil pressure increases the difficult problem of badly damaged parts.
Description of drawings
It is such that the structure of the utility model constitutes:
Fig. 1 is the structural representation of the utility model hydraulic crawler excavator secondary back pressure system.
Among Fig. 1, operating cylinder (1), running motor (2), rotary motor (3), multiple directional control valve (4), bypass counterbalance valve (5), main counterbalance valve (6), oil cooler (7), main pump (8), fuel tank (9).
The specific embodiment
The embodiment of the utility model is such; Referring to accompanying drawing; Main counterbalance valve (6) is communicated with fuel tank (9) through oil cooler (7); Bypass counterbalance valve (5) directly is communicated with fuel tank (9), and main counterbalance valve (6) is lower than the opening pressure of bypass counterbalance valve (5) with the parallelly connected oil return of bypass counterbalance valve (5), the opening pressure of main counterbalance valve (6).Described main pump (8) oil-out is communicated with multiple directional control valve (4) oil-in; Described multiple directional control valve (4) oil-out is communicated with operating cylinder (1), running motor (2), rotary motor (3) actuator port respectively; Described multiple directional control valve (4) oil return opening is communicated with main counterbalance valve (6), bypass counterbalance valve (5) respectively; Described main counterbalance valve (6) is communicated with fuel tank (9) through oil cooler (7), and described bypass counterbalance valve (5) is communicated with fuel tank (9).Described main counterbalance valve (6) and the parallelly connected oil return of bypass counterbalance valve (5).
Referring to accompanying drawing; During the excavating machine starting operation, main counterbalance valve (6) is opened and is realized system oil return under most of situation, when some operation recirculating oil quantity heightens, when hydraulic oil viscosity becomes big (cold day initiating task); Return oil pressure can increase rapidly; Bypass counterbalance valve (5) is opened oil return when increasing to setting value, and system back pressure is maintained in the normal range (NR), and the protection system parts are avoided damaging; Two counterbalance valve parallel connections of every employing oil return is kept in the zone of reasonableness of setting the excavator system back pressure always, all belongs to the protection domain of the utility model.
Claims (2)
1. hydraulic crawler excavator secondary back pressure system; Comprise operating cylinder, running motor, rotary motor, multiple directional control valve, bypass counterbalance valve, main counterbalance valve, oil cooler, main pump, fuel tank; It is characterized in that main pump (8) oil-out is communicated with multiple directional control valve (4) oil-in; Multiple directional control valve (4) oil-out is communicated with operating cylinder (1), running motor (2), rotary motor (3) actuator port respectively; Multiple directional control valve (4) oil return opening is communicated with main counterbalance valve (6), bypass counterbalance valve (5) respectively, and main counterbalance valve (6) is communicated with fuel tank (9) through oil cooler (7), and bypass counterbalance valve (5) is communicated with fuel tank (9).
2. according to the described hydraulic crawler excavator secondary of claim 1 back pressure system, it is characterized in that main counterbalance valve (6) and the parallelly connected oil return of bypass counterbalance valve (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220183442 CN202577439U (en) | 2012-04-24 | 2012-04-24 | Secondary backpressure system of hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220183442 CN202577439U (en) | 2012-04-24 | 2012-04-24 | Secondary backpressure system of hydraulic excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202577439U true CN202577439U (en) | 2012-12-05 |
Family
ID=47246868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220183442 Expired - Fee Related CN202577439U (en) | 2012-04-24 | 2012-04-24 | Secondary backpressure system of hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202577439U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298996A (en) * | 2015-12-02 | 2016-02-03 | 湖南三一路面机械有限公司 | Pumping hydraulic system and concrete pump truck |
| CN106862069A (en) * | 2017-04-26 | 2017-06-20 | 山东省玛丽亚农业机械有限公司 | A kind of garlic onion hydraulic pressure separator |
-
2012
- 2012-04-24 CN CN 201220183442 patent/CN202577439U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298996A (en) * | 2015-12-02 | 2016-02-03 | 湖南三一路面机械有限公司 | Pumping hydraulic system and concrete pump truck |
| CN105298996B (en) * | 2015-12-02 | 2017-09-22 | 湖南三一路面机械有限公司 | Hydraulic system of pump and concrete mixer |
| CN106862069A (en) * | 2017-04-26 | 2017-06-20 | 山东省玛丽亚农业机械有限公司 | A kind of garlic onion hydraulic pressure separator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20150424 |
|
| EXPY | Termination of patent right or utility model |