CN203174660U - Load-sensitive control system of loading machine - Google Patents
Load-sensitive control system of loading machine Download PDFInfo
- Publication number
- CN203174660U CN203174660U CN 201320085797 CN201320085797U CN203174660U CN 203174660 U CN203174660 U CN 203174660U CN 201320085797 CN201320085797 CN 201320085797 CN 201320085797 U CN201320085797 U CN 201320085797U CN 203174660 U CN203174660 U CN 203174660U
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- Prior art keywords
- oil
- valve
- load
- sensitive
- pilot
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- 238000006073 displacement reaction Methods 0.000 claims description 19
- 239000012530 fluid Substances 0.000 claims description 10
- 239000002828 fuel tank Substances 0.000 claims description 7
- 239000003921 oil Substances 0.000 abstract description 25
- 239000010720 hydraulic oil Substances 0.000 abstract description 3
- 230000000630 rising effect Effects 0.000 abstract 1
- 230000002950 deficient Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Fluid-Pressure Circuits (AREA)
Abstract
The utility model relates to loading machines, in particular to a load-sensitive control system of a loading machine. An oil outlet of a walking plunger pump is communicated with a first pipeline, the end portion of the first pipeline is connected with an energy accumulator and a two-position two-way solenoid reversing valve in parallel, the other end of the two-position two-way solenoid reversing valve is connected into the oil inlet of a pilot control valve, the control oil port of the pilot control valve is connected with the control port of a load-sensitive multitandem valve through pipelines, the oil outlet of the pilot control valve is connected with an oil tank, and the feedback oil port of the load-sensitive multitandem valve is connected with the feedback oil port of a working plunger pump. According to the load-sensitive control system of the loading machine, the control oil of the pilot control valve is supplied by an oil filling pump in the walking plunger pump, a pilot pump is removed, and traditional oil supplying of the pilot pump is replaced. The working plunger pump adjusts the output of pressure and flow through the feedback oil port of the load-sensitive multitandem valve according to the changes of loads, the power of an engine is effectively used, the temperature rising of hydraulic oil is controlled, and energy saving and environment protection are achieved.
Description
Technical field
The utility model relates to loader, especially relates to the load-sensitive control system of loader.
Background technology
At present, in domestic each big producer selection for the loader operation system, generally adopt the mechanical switch valve, this kind structure can produce steering force big, have defectives such as idle stroke, equipment fine motion difference, these defectives can cause driver's labour intensity to increase, and cause tired driver work to produce potential safety hazard.
Adopt pilot control to control loader in the market of developed countries such as America and Europe especially abroad, its guide's oil sources is by independently pioneer pump supply more.By handling pilot valve, promote main valve plug with guide oil, realize the action of loading arm and scraper bowl, this kind maneuverability pattern is very light, reduced driver's labour intensity and be easy to realize accurate location to swing arm and scraper bowl, but this kind structure is also natural inevitable defective arranged: owing to adopt independently pioneer pump fuel feeding technical scheme, cause the increase of design cost on the one hand, also caused complex structure on the other hand, the trouble point of having increased complete machine.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of load-sensitive control system of simple in structure, ingenious, rational loader is provided, and this system architecture is simple, reliability is high, handling comfort is strong, energy-conserving and environment-protective.
The technical scheme that provides according to the utility model: a kind of load-sensitive control system of loader, be characterised in that: an oil-out of walking plunger displacement pump is connected first pipeline, described first pipeline end accumulator in parallel, the 2/2-way solenoid operated directional valve, the described 2/2-way solenoid operated directional valve other end inserts the oil-in of pilot control valve, the control port of pilot control valve connects the control mouth of load sensing multi-way valve by pipeline, the oil-out of pilot control valve connects fuel tank, the oil-out of load sensing multi-way valve inserts fuel tank by the oil return filter core, and the equipment oil cylinder is connected with load sensing multi-way valve; The feedback hydraulic fluid port of the feedback hydraulic fluid port connection work plunger displacement pump of described load sensing multi-way valve.
As further improvement of the utility model, at described first pipeline one way valve is installed.
The utility model compared with prior art, advantage is: the control oil of pilot control valve is that slippage pump by walking plunger displacement pump inside provides in the load-sensitive control system of the utility model loader, reduced by a pioneer pump, replaced traditional pioneer pump fuel feeding; The work plunger displacement pump passes through the feedback hydraulic fluid port of load sensing multi-way valve according to the output of the variation adjusting pressure-flow of load, effectively utilizes engine power, and the temperature rise of control hydraulic oil realizes energy-conserving and environment-protective.
Description of drawings
Fig. 1 is structural representation of the present utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with concrete drawings and Examples.
As shown in Figure 1, comprise fuel tank 1, walking plunger displacement pump 2, one way valve 3, accumulator 4,2/2-way solenoid operated directional valve 5, pilot control valve 6, load sensing multi-way valve 7, equipment oil cylinder 8, work plunger displacement pump 9, oil return filter core 10, first pipeline 11 etc.
As shown in Figure 1, the utility model is a kind of load-sensitive control system of loader, an oil-out of walking plunger displacement pump 2 is connected first pipeline 11, at first pipeline 11 one way valve 3 is installed, first pipeline, 11 ends accumulator 4 in parallel, 2/2-way solenoid operated directional valve 5,2/2-way solenoid operated directional valve 5 other ends insert the oil-in of pilot control valve 6, pilot control valve 6(pilot control valve 6 is made up of with the dump ram control valve the boom cylinder control valve) control port be connected load sensing multi-way valve 7(load sensing multi-way valve 7 by pipeline and formed by boom cylinder control valve and dump ram control valve) the control mouth, the effect of this control mouth is that mainly will introduce the spool that is used for control load sensing multi-way valve 7 in the load sensing multi-way valve 7 by the guide oil that arrives first control valve 6 be in different operating positions, make the work fluid that enters load sensing multi-way valve 7 by work plunger displacement pump 9 selectively enter the big of equipment oil cylinder according to the difference of spool present position in the load sensing multi-way valve 7, loculus satisfies extraneous requirements of one's work to reach, and the oil-out of pilot control valve 6 connects fuel tank 1
,The oil-out of load sensing multi-way valve 7 inserts fuel tank 1 by oil return filter core 10, and equipment oil cylinder 8 is connected with load sensing multi-way valve 7;
The feedback hydraulic fluid port of the feedback hydraulic fluid port connection work plunger displacement pump 9 of load sensing multi-way valve 7, the feedback hydraulic fluid port of work plunger displacement pump 9 is according to the variation of extraneous load size.
The slippage pump of the utility model walking plunger displacement pump 2 inside provides pressure oil-source stable, the low pressure low discharge for pilot control valve 6.
As shown in Figure 1, the utility model arranges oil circuit between walking plunger displacement pump 2 and pilot control valve 6, slippage pump by walking plunger displacement pump 2 inside provides pressure oil to pilot control valve 6, the feedback hydraulic fluid port cut-in operation plunger displacement pump 9 of load sensing multi-way valve 7, variation according to extraneous load size, the swash plate of adjusting work plunger displacement pump 9 is realized the variation output of pressure-flow to reach work plunger displacement pump 9, in other words, motor provides the power that adapts according to the variation of load size, so just effectively utilize the power of motor, avoid the waste of the power that quantitative system causes, effectively controlled the temperature rise of hydraulic oil, reached the purpose of energy-conserving and environment-protective.The utility model is also at engine misses, walking plunger displacement pump 2 idle special circumstances, insert pilot control valve 6 by accumulator 4 pressure oils by 2/2-way solenoid operated directional valve 5 and adjust boom cylinder 8 height of drops in order to reach, thereby guarantee the trouble free service of loader.
Claims (2)
1. the load-sensitive control system of a loader, it is characterized in that: an oil-out of walking plunger displacement pump (2) is connected first pipeline (11), described first pipeline (11) end accumulator (4) in parallel, 2/2-way solenoid operated directional valve (5), described 2/2-way solenoid operated directional valve (5) other end inserts the oil-in of pilot control valve (6), the control port of pilot control valve (6) connects the control mouth of load sensing multi-way valve (7) by pipeline, the oil-out of pilot control valve (6) connects fuel tank (1), the oil-out of load sensing multi-way valve (7) inserts fuel tank (1) by oil return filter core (10), and equipment oil cylinder (8) is connected with load sensing multi-way valve (7); The feedback hydraulic fluid port of the feedback hydraulic fluid port connection work plunger displacement pump (9) of described load sensing multi-way valve (7).
2. the load-sensitive control system of loader as claimed in claim 1 is characterized in that: at described first pipeline (11) one way valve (3) is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320085797 CN203174660U (en) | 2013-02-25 | 2013-02-25 | Load-sensitive control system of loading machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320085797 CN203174660U (en) | 2013-02-25 | 2013-02-25 | Load-sensitive control system of loading machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203174660U true CN203174660U (en) | 2013-09-04 |
Family
ID=49071384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320085797 Withdrawn - After Issue CN203174660U (en) | 2013-02-25 | 2013-02-25 | Load-sensitive control system of loading machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203174660U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114624A (en) * | 2013-02-25 | 2013-05-22 | 无锡开普机械有限公司 | Load-sensitive operation system of loading machine |
| CN113383132A (en) * | 2019-01-23 | 2021-09-10 | 沃尔沃建筑设备公司 | Control unit for a hydraulic system |
-
2013
- 2013-02-25 CN CN 201320085797 patent/CN203174660U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114624A (en) * | 2013-02-25 | 2013-05-22 | 无锡开普机械有限公司 | Load-sensitive operation system of loading machine |
| CN103114624B (en) * | 2013-02-25 | 2015-11-18 | 无锡开普机械有限公司 | The load-sensitive control system of loader |
| CN113383132A (en) * | 2019-01-23 | 2021-09-10 | 沃尔沃建筑设备公司 | Control unit for a hydraulic system |
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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 |
Granted publication date: 20130904 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |