CN204898768U - Positive flow of excavator and general hydraulic system of burden flow - Google Patents
Positive flow of excavator and general hydraulic system of burden flow Download PDFInfo
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- CN204898768U CN204898768U CN201520539830.1U CN201520539830U CN204898768U CN 204898768 U CN204898768 U CN 204898768U CN 201520539830 U CN201520539830 U CN 201520539830U CN 204898768 U CN204898768 U CN 204898768U
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- flow
- oil duct
- main valve
- valve assembly
- modularization
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- Fluid-Pressure Circuits (AREA)
Abstract
The utility model discloses a positive flow of excavator and general hydraulic system of burden flow belongs to engineering machinery. Its technical scheme's main points are: including guide controlling means, the main valve assembly, actuating mechanism and flow pump assembly, the main valve assembly includes at least one valve body, be equipped with central bypass oil duct and oil return way in the valve body, the main valve assembly is connected to flow pump assembly, actuating mechanism is connected to the main valve assembly, guide controlling means controls the actuating mechanism action through the main valve assembly, it connects the oil duct still to be equipped with the modularization on the valve body, the modularization is connected the oil duct and is communicate with central bypass oil duct and oil return way respectively, be equipped with the outer joint mouth on the modularization connection oil duct, install plug or burden flow feedback valve on the outer joint mouth. The utility model discloses a to the exchange of main valve assembly plug and burden flow feedback valve, the transformation of having realized positive flow hydraulic system of excavator and burden flow hydraulic system has been reduced manufacture factory's manufacturing cost and has been managed the degree of difficulty.
Description
Technical field
The utility model is a kind of hydraulic system of excavator, specifically, particularly relates to a kind of excavator positive flow and minus flow General hydraulic system.
Background technology
Excavator, also known as excavation machinery, is excavate higher or lower than the material holding machine side with scraper bowl, and loads haulage vehicle or unload the earth moving plant to windrow factory.From the development of engineering machinery in recent years, the development of excavator is relatively very fast, and excavator has become one of most important engineering machinery in engineering construction.In medium-and-large-sized excavator, the type of more than 70% is positive flow system excavator and minus flow system excavator.What excavator now accounted for exhausted major part is full hydraulic excavator.Opening in central liquid pressing system, according to flow-control classification, excavator hydraulic system is divided into positive flow system and minus flow system.Minus flow system acts on the variable governor motion of pump by the pressure signal before collection main valve meta throttle orifice, and pumpage and pressure signal are inversely proportional to.During normal work, the fluid that pump is discharged flows to executing agency by a main control valve part, part oil return after central bypass oil duct, minus flow feedback valve.When controlling executing agency and slowing down, go the fluid of executing agency to reduce, through the oil increasing of bypass oil duct oil return, the pressure before minus flow feedback valve throttle orifice raises, and this pressure signal acts on pump by FL or FR, and respective pump discharge capacity is reduced; Otherwise, when controlling executing agency and accelerating, remove the oil increasing of executing agency, and reduce through the fluid of central bypass oil duct, lower pressure signal acts on the governor motion of pump, make corresponding pump delivery large, thus flow and the executing agency demand to flow meeting pump matches.The control signal of positive flow is from guide's secondary pressure, and principle selects by a series of shuttle valve or pressure sensor the stroking mechanism that the highest secondary pressure signal removes to control main pump.Pressure is when handle displacement strengthens, and secondary pilot pressure raises, and the pressure signal of rising acts on the governor motion of pump, and pump swash plate angle is increased, and discharge capacity increases; Otherwise when handle displacement diminishes, secondary pilot pressure diminishes, and pump delivery diminishes, thus flow and the executing agency demand to flow meeting pump matches.
At present, long-term co-existence is gone down by positive flow system and minus flow system.In the market two kinds of systems due to valve arrangement gap comparatively large, for complete system plant, two kinds of hydraulic system gaps are also comparatively large, and related fluid casting die, as the poor universality of pipeline, adds cost of production to a certain extent.
Summary of the invention
The purpose of this utility model is to provide a kind of excavator positive flow and minus flow General hydraulic system, to overcome the defect that during positive-flow hydraulic system and minus flow hydraulic system in prior art are produced, the not general cost of production caused of component is high, management is inconvenient.
The utility model realizes by the following technical solutions: a kind of excavator positive flow and minus flow General hydraulic system, comprise leading controller, main valve assembly, executing agency and flow pump assembly, main valve assembly comprises at least one valve body, central bypass oil duct and back oil road is provided with in valve body, flow pump assembly connects main valve assembly, main valve assembly connects executing agency, leading controller controls executing agency's action by main valve assembly, valve body is also provided with modularization and connects oil duct, modularization connects oil duct and is communicated with back oil road with central bypass oil duct respectively, modularization connects oil duct and is provided with outer connector, outer connector is provided with plug or minus flow feedback valve, when plug is installed, central authorities' bypass oil duct is connected oil duct with back oil road by modularization and is directly connected, when installing minus flow feedback valve, central bypass oil duct is through the damping hole of minus flow feedback valve before oil return, and minus flow feedback valve gathers pressure signal before damping hole by signal port FR/FL, and by this signal feedback on the flow control device of flow pump assembly.
Compared with prior art, the beneficial effects of the utility model are:
1) reduce costs: because positive flow system and minus flow system share a system platform, improve the versatility of element, as main valve installing plate, the relevant pipe fitting etc. that connects to valve, the R&D costs of complete system plant, management cost etc. are all reduced.
2) stock is reduced: the general reduction also meaning stock of element.The originally stock of needs two cover systems for subsequent use, after positive minus flow shares a platform, most of element is general, and these universal components only need the stock of set of system for subsequent use.
3) reduce labour intensity: concerning operator, the generalization degree of system is higher, mean that operation is more simplified, obviously can reduce labor strength.
4) contribute to enhancing product performance: the application due to this system platform makes positive and negative flow system share the large data of identical complete machine, the aspect such as also make research staff more energy is dropped in power match, pipeline optimization, noise reduction, to increase the service life, will improve product various aspects of performance further.
Accompanying drawing explanation
Fig. 1 is positive-flow hydraulic system principle sketch of the present utility model;
Fig. 2 is minus flow Hydraulic System Principle sketch of the present utility model;
Fig. 3 is the structural representation of main valve assembly of the present utility model.
Fig. 4 is the structural representation of main valve of the present utility model;
Fig. 5 is the I portion enlarged drawing of Fig. 4;
Fig. 6 is the schematic diagram of positive flow valve assembly of the present utility model;
Fig. 7 is the schematic diagram of minus flow valve assembly of the present utility model;
Fig. 8 is the structural representation that connector of the present utility model installs plug;
Fig. 9 is the structural representation that connector of the present utility model installs minus flow feedback valve;
In figure: 1, leading controller; 2, main valve assembly; 3, executing agency; 4, flow pump assembly; 5, valve body; 6, central bypass oil duct; 7, modularization connects oil duct; 8, back oil road; 9, outer connector; 10, plug; 11, minus flow feedback valve; 12, damping hole; 13, signal port FR/FL.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1 and Figure 2, a kind of excavator positive flow and minus flow General hydraulic system, comprise leading controller 1, main valve assembly 2, executing agency 3 and flow pump assembly 4.Application CAST theory, the utility model carries out novelty modularized design to central bypass oil road 6 structure on valve body 5, on the valve body of left and right, each extraction modularization connects oil duct 7, realize main control valve valve body 5 general on positive flow valve and minus flow valve, thus realize the conversion of a kind of general positive flow system and minus flow system.
As shown in Fig. 3 to Fig. 7, main valve assembly 2 comprises at least one valve body 5, be provided with central bypass oil duct 6 in valve body 5, back oil road 8 is connected oil duct 7 with modularization, flow pump assembly 4 connects main valve assembly 2, main valve assembly 2 connects executing agency 3, leading controller 1 controls flow pump delivery, and modularization connects oil duct 7 and is communicated with back oil road 8 with central bypass oil duct 6 respectively, and modularization connects oil duct 7 and is provided with outer connector 9.
As shown in Figure 8, Figure 9, outer connector 9 is provided with plug 10 or minus flow feedback valve 11, when installing plug 10, central bypass oil duct 6 is connected oil duct 7 with back oil road 8 by modularization and is directly connected; When minus flow feedback valve 11 is installed, minus flow feedback valve 11 is provided with damping hole 12 and signal port FR/FL13, central authorities' bypass oil duct 6 before oil return through the damping hole 12 of minus flow feedback valve 11, minus flow feedback valve 11 gathers pressure signal before damping hole 12 by signal port FR/FL13, and by this signal feedback on the flow control device of flow pump assembly 4.
Operating principle of the present utility model:
When be linked and packed plug 10 time, flow pump assembly 4 is positive flow pump assembly, forms positive flow system.The principle of work and power of positive flow system is as follows: control crank, produces secondary pilot pressure, and the stroking mechanism that the highest secondary pressure signal removes to control positive flow pump selected by pressure sensor (also by a series of shuttle valve); When handle displacement strengthens, secondary pilot pressure raises, and higher pressure signal acts on the governor motion of pump, and pump swash plate angle is increased, and discharge capacity increases; Otherwise when handle displacement diminishes, secondary pilot pressure diminishes, and pump delivery diminishes, thus flow and the executing agency demand to flow meeting pump matches.
When be linked and packed minus flow feedback valve 11 time, flow pump assembly 4 is minus flow pump assembly, forms minus flow system.When valve realizes the function of minus flow valve by interchangeable module, pump pressure oil is through the not directly oil return of central bypass oil duct 6, minus flow feedback valve 11 makes central bypass oil duct 6 need through a damping hole 12 before oil return, and by pressure signal before signal port FR/FL13 collection damping hole 12, this pressure signal transmission is on the governor motion of minus flow pump; When needed for system actuator, flow diminishes, the flow through this damping hole 12 oil return becomes large, and the pressure before damping hole 12 also just raises, and the pressure of signal port FR/FL13 is applied on pump delivery governor motion, and pump swash plate oblique angle is diminished, and discharge capacity diminishes; Otherwise when flow needed for system actuator becomes large, the flow through this damping hole 12 oil return diminishes, and the pressure before damping hole 12 reduces, and the pressure signal of signal port FR/FL13 feeds back on pump delivery governor motion, make pump swash plate oblique angle become large, discharge capacity becomes large.
Claims (1)
1. an excavator positive flow and minus flow General hydraulic system, comprise leading controller (1), main valve assembly (2), executing agency (3) and flow pump assembly (4), described main valve assembly (2) comprises at least one valve body (5), central bypass oil duct (6) and back oil road (8) is provided with in described valve body (5), flow pump assembly (4) connects main valve assembly (2), main valve assembly (2) connects executing agency (3), leading controller (1) controls executing agency (3) action by main valve assembly (2), it is characterized in that: described valve body (5) is also provided with modularization and connects oil duct (7), described modularization connects oil duct (7) and is communicated with back oil road (8) with central bypass oil duct (6) respectively, modularization connects oil duct (7) and is provided with outer connector (9), described outer connector (9) is provided with plug (10) or minus flow feedback valve (11), when plug (10) are installed, central authorities' bypass oil duct (6) are connected oil duct (7) with back oil road (8) by modularization and are directly connected, when minus flow feedback valve (11) are installed, central authorities bypass oil duct (6) before oil return through the damping hole (12) of minus flow feedback valve (11), minus flow feedback valve (11) is by signal port FR/FL(13) gather damping hole (12) front pressure signal, and by this signal feedback on the flow control device of flow pump assembly (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520539830.1U CN204898768U (en) | 2015-07-23 | 2015-07-23 | Positive flow of excavator and general hydraulic system of burden flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520539830.1U CN204898768U (en) | 2015-07-23 | 2015-07-23 | Positive flow of excavator and general hydraulic system of burden flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204898768U true CN204898768U (en) | 2015-12-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520539830.1U Withdrawn - After Issue CN204898768U (en) | 2015-07-23 | 2015-07-23 | Positive flow of excavator and general hydraulic system of burden flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204898768U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105064444A (en) * | 2015-07-23 | 2015-11-18 | 山东临工工程机械有限公司 | Positive flow and negative flow universal hydraulic system of excavator |
-
2015
- 2015-07-23 CN CN201520539830.1U patent/CN204898768U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105064444A (en) * | 2015-07-23 | 2015-11-18 | 山东临工工程机械有限公司 | Positive flow and negative flow universal hydraulic system of excavator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151223 Effective date of abandoning: 20170630 |