CN202248035U - Hydraulic system of excavator - Google Patents
Hydraulic system of excavator Download PDFInfo
- Publication number
- CN202248035U CN202248035U CN201120332978XU CN201120332978U CN202248035U CN 202248035 U CN202248035 U CN 202248035U CN 201120332978X U CN201120332978X U CN 201120332978XU CN 201120332978 U CN201120332978 U CN 201120332978U CN 202248035 U CN202248035 U CN 202248035U
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- CN
- China
- Prior art keywords
- hydraulic
- oil
- main pump
- excavator
- hydraulic system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a hydraulic system of an excavator. The hydraulic system comprises a first main pump and a second main pump, wherein the first main pump and the second main pump are connected with a multiway valve, the multiway valve is connected with a pilot valve bank, and hydraulic oil flowing out from the multiway valve flows back to an oil return box through a hydraulic oil heat radiator. The hydraulic system is characterized in that two ends of the hydraulic oil heat radiator are connected with an oil-return bypass electromagnetic valve in parallel, the oil-return bypass electromagnetic valve is connected with an oil tank and a controller of an excavator electric control system, a hydraulic oil temperature sensor is arranged on a pipeline for connecting the second main pump and the multiway valve, and temperature signals sent by the hydraulic oil temperature sensor are received by the controller. According to the utility model, the speed for increasing the temperature of the hydraulic oil of the excavator hydraulic system can be increased, the resistance of the hydraulic system can be reduced, the whole hydraulic system can be protected, the action speed of the entire excavator can be promoted, the normal operation of an operator is facilitated, the power of an engine is fully utilized and the oil consumption of the engine is reduced correspondingly.
Description
Technical field
The utility model relates to a kind of hydraulic system that is used for excavator.
Background technology
Hydraulic crawler excavator is widely used in the building construction foundation dredging and the occasions such as cleaning, urban duct laying, construction of water conservancy works that complete; It is a kind of Engineering Work machine that excavates and load and transport; Be used for infrastructures such as city, traffic, water conservancy, mine, river course, be called as " high-efficiency multi-function machinery ".Hydraulic crawler excavator has construction maneuverability, advantage such as efficient.Hydraulic crawler excavator is made up of four parts such as equipment, slewing equipment, running gear and hydraulic control devices; And equipment is a device of directly accomplishing the digging machine task; Be that three parts are hinged forms by swing arm, dipper, scraper bowl etc., swing arm goes up and down, dipper is flexible, the revolution of the walking of scraper bowl folding and unfolding, running gear and slewing equipment falls through hydraulic pressure by control device that each hydraulic pump fuel feeding of control realizes after rise.
Along with the development of excavator technology, multifunction, an intelligent trend that has become the excavator development.This just requires excavator not only can adapt to various operating modes, but also will be fit to various working environments.When excavator was worked under cryogenic conditions, hydraulic oil viscosity was bigger, caused the hydraulic system resistance big and the lever operated resistance of guide is also bigger, brought unnecessary trouble to the operator.Simultaneously, the complete machine action is slower, and the engine power utilization rate is lower, and the oil consumption of motor is higher simultaneously.
Summary of the invention
The purpose of the utility model provides the warm hoisting velocity of a kind of raising excavator hydraulic system hydraulic oil oil, reduces the hydraulic system of hydraulic system resistance.
In order to achieve the above object; The technical scheme of the utility model has provided a kind of hydraulic system of excavator, comprises first main pump and second main pump, and first main pump and second main pump connect banked direction control valves; Banked direction control valves connects the pilot valve group; The hydraulic oil that flows out from banked direction control valves flows back to fuel tank through hydraulic oil radiator, it is characterized in that: at the two ends of hydraulic oil radiator parallel connection one oil return bypass solenoid valve, the oil return bypass solenoid valve connects the controller of fuel tank and excavator electric-control system; On second main pump and pipeline that banked direction control valves links to each other, be provided with the hydraulic fluid temperature sensor, the temperature signal that the hydraulic fluid temperature sensor provides is received by controller.
The utility model has increased by an oil return bypass solenoid valve on the basis of original hydraulic system; When the temperature of hydraulic oil is not more than certain setting value; By controller the oil return bypass solenoid valve is opened, at this moment, hydraulic oil does not directly flow back to fuel tank through hydraulic oil radiator.Like this; Under the lower condition of temperature, can improve the speed that excavator hydraulic system hydraulic oil oil temperature promotes, reduce the hydraulic system resistance; Protect whole hydraulic system; Promote the complete machine responsiveness, help operator's normal operation, make full use of the power and the corresponding reduction engine consumption of motor.
Description of drawings
The sketch map of the hydraulic system of a kind of excavator that Fig. 1 provides for the utility model.
The specific embodiment
For making the utility model more obviously understandable, now with a preferred embodiment, and conjunction with figs. elaborates as follows.
As shown in Figure 1; The hydraulic system of a kind of excavator that the utility model provides comprises that first main pump 1 and second main pump, 2, the first main pumps 1 and second main pump 2 connect banked direction control valves 4; Banked direction control valves 4 connects pilot valve group 7; The hydraulic oil that flows out from banked direction control valves 4 flows back to fuel tank through hydraulic oil radiator 5, it is characterized in that: at the two ends of hydraulic oil radiator 5 parallel connection one oil return bypass solenoid valve 6, oil return bypass solenoid valve 6 connects the controller of fuel tank and excavator electric-control system; On second main pump 2 and pipeline that banked direction control valves 4 links to each other, be provided with hydraulic fluid temperature sensor 3, the temperature signal that hydraulic fluid temperature sensor 3 provides is received by controller.
The shortcoming of existing hydraulic system is: no matter why hydraulic fluid temperature is worth, and the hydraulic oil-returning of whole hydraulic system is all through flowing back to fuel tank after hydraulic oil radiator 5 coolings.Like this when ambient temperature is lower than 40 ° of C and particularly is lower than 0 ° of C, hydraulic system is because the characteristic of hydraulic pressure itself, and viscosity becomes greatly; Make the complete machine speed of service slow, operate insensitive, exercise not harmony; Because hydraulic oil-returning through the cooling of hydraulic oil radiator, more is unfavorable for the rapid rising of hydraulic fluid temperature, needing causes machine to move and just can make complete machine reach normal running status for a long time again; Ambient temperature is low more, and running time is just long more, and the fuel oil of waste is just many more.
For the utility model, the numerical value that the electric control system controls device detects according to hydraulic oil temperature sensor 3 is when Temperature numerical during less than 50 ° of C; Controller output high level; Oil return bypass solenoid valve 6 gets electric, and spool is opened, and change has just taken place the oil return circuit of whole hydraulic system; Be that system's hydraulic oil-returning is not directly to have cooled off the back oil sump tanks through hydraulic oil radiator 5; But, need not pass through hydraulic oil radiator 5 more directly through oil return bypass solenoid valve 6 oil sump tanks, promptly temperature is crossed the hydraulic oil-returning of control system when hanging down; Do not allow hydraulic oil to cool off through hydraulic oil radiator 5, system's hydraulic fluid temperature can be elevated to the temperature range of hydraulic oil operate as normal very soon like this.The Temperature numerical that detects when hydraulic fluid temperature sensor 3 is during greater than 53 ° of C; Controller can cut off high level output; Oil return bypass solenoid valve 6 is closed; The oil return of whole hydraulic system is normally carried out by the oil return circuit in the former scheme, makes the hydraulic oil in the hydraulic circuit remain on normal operating temperature always.
Claims (1)
1. the hydraulic system of an excavator; Comprise first main pump (1) and second main pump (2); First main pump (1) and second main pump (2) connect banked direction control valves (4); Banked direction control valves (4) connects pilot valve group (7); The hydraulic oil that flows out from banked direction control valves (4) flows back to fuel tank through hydraulic oil radiator (5), it is characterized in that: at the two ends of hydraulic oil radiator (5) parallel connection one oil return bypass solenoid valve (6), oil return bypass solenoid valve (6) connects the controller of fuel tank and excavator electric-control system; On second main pump (2) and pipeline that banked direction control valves (4) links to each other, be provided with hydraulic fluid temperature sensor (3), the temperature signal that hydraulic fluid temperature sensor (3) provides is received by controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120332978XU CN202248035U (en) | 2011-09-07 | 2011-09-07 | Hydraulic system of excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120332978XU CN202248035U (en) | 2011-09-07 | 2011-09-07 | Hydraulic system of excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202248035U true CN202248035U (en) | 2012-05-30 |
Family
ID=46109297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120332978XU Expired - Fee Related CN202248035U (en) | 2011-09-07 | 2011-09-07 | Hydraulic system of excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202248035U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109797802A (en) * | 2019-02-14 | 2019-05-24 | 青岛雷沃工程机械有限公司 | A kind of control device of excavator automatic preheating |
-
2011
- 2011-09-07 CN CN201120332978XU patent/CN202248035U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109797802A (en) * | 2019-02-14 | 2019-05-24 | 青岛雷沃工程机械有限公司 | A kind of control device of excavator automatic preheating |
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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: 20120530 Termination date: 20140907 |
|
| EXPY | Termination of patent right or utility model |