CN204803957U - Loader hydraulic system - Google Patents
Loader hydraulic system Download PDFInfo
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- CN204803957U CN204803957U CN201520415630.5U CN201520415630U CN204803957U CN 204803957 U CN204803957 U CN 204803957U CN 201520415630 U CN201520415630 U CN 201520415630U CN 204803957 U CN204803957 U CN 204803957U
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Abstract
The utility model discloses a loader hydraulic system belongs to engineering machinery hydraulic control field for the loader, it includes hydraulic tank, hydraulic tank is connected with working barrel, steering pump, the working barrel passes through the fluid pressure line and is connected with multiple unit valve, shuttle valve, ooff valve respectively, the multiple unit valve is connected with pilot valve, pressure selection valve, boom cylinder and commentaries on classics fill hydro -cylinder respectively, and wherein the pressure selection valve passes through the shuttle valve and is connected with the flow valve, the steering pump is connected with flow valve, ooff valve respectively, and the flow valve all is connected through fluid pressure line and pressure -gradient control valve with the ooff valve, and the pressure -gradient control valve is connected with the steering gear, and the steering gear is connected with steering cylinder, wherein still be connected with the sequence valve between flow valve and the ooff valve. In view of above -mentioned technical scheme, the utility model discloses can solve the problem that the hydraulic system power loss is big, later maintenance is with high costs among the prior art, the energy resource consumption that can avoid again by a wide margin causing and the problem of cost -push.
Description
Technical field
The utility model belongs to engineering machinery hydraulic control field, specifically, particularly relates to a kind of loader hydraulic system for loader.
Background technology
In engineering machinery, loader generally carries out spading operation and loading operation, and complete machine frequently completes left and right turn, receives the actions such as bucket, lifting, discharging, and these all need hydraulic system to carry out control realization.Generally be made up of machining device hydraulic system, steering hydraulic system in existing loader hydraulic system.
Generally, working barrel in machining device hydraulic system supplies separately rotary ink tank in equipment and elevating ram, steering pump supplies steering cylinder separately, this independently feed system easily causes the working barrel when emergence operating mode to export most of flow being in overflow situation, and wasted power is larger; The pilot control of pilot control hydraulic system derives from pioneer pump, and the existence of pioneer pump adds the loss of power, and the maintenance cost in later stage can increase.
Summary of the invention
The purpose of this utility model is to provide a kind of loader hydraulic control system, and it can solve the problem that in prior art, power lost of hydraulic power is large, later maintenance cost is high, can avoid again significantly transforming the problem that the energy consumption that causes and cost increase.
For reaching above-mentioned technique effect, the utility model is achieved through the following technical solutions:
Loader hydraulic system described in the utility model, comprise hydraulic oil container, described hydraulic oil container is connected with working barrel, steering pump, described working barrel is connected with banked direction control valves, shuttle valve, switch valve respectively by fluid pressure line, described banked direction control valves is connected with pilot valve, pressure selection valve, boom cylinder and rotary ink tank respectively, and wherein pressure selection valve is connected with flow valve by shuttle valve; Described steering pump is connected with flow valve, switch valve respectively, and flow valve is all connected with pressure-gradient control valve by fluid pressure line with switch valve, and pressure-gradient control valve is connected with steering gear, and steering gear is connected with steering cylinder, is also connected with sequence valve between wherein said flow valve and switch valve.
Say further, between the hydraulic oil container described in the utility model and return line, be provided with strainer.
Say further, steering pump series connection the 3rd hydraulic pump described in the utility model forms duplex pump structure.
Compared with prior art, the utility model has following beneficial effect:
1, the utility model has given up pioneer pump, and guide's energy source is from the output flow with working barrel and steering pump, and what pressure was large is pilot control, thus achieves and reduce design, produce and the cost of later maintenance,
2, the utility model can realize in emergence working condition decline low power loss by adopting sequence valve, increases the tractive force of motor.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
In figure: 1, working barrel; 2, hydraulic oil container; 3, pilot valve; 4, pressure selection valve; 5, shuttle valve; 6, flow valve; 7, steering pump; 8, switch valve; 9, strainer; 10, sequence valve; 11, pressure-gradient control valve; 12, steering gear; 13, steering cylinder; 14, banked direction control valves; 15, boom cylinder; 16, rotary ink tank.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the utility model is described further.
Embodiment 1: a kind of loader hydraulic system, comprise hydraulic oil container 2, described hydraulic oil container 2 is connected with working barrel 1, steering pump 7, described working barrel 1 is connected with banked direction control valves 14, shuttle valve 5, switch valve 8 respectively by fluid pressure line, described banked direction control valves 14 is connected with pilot valve 3, pressure selection valve 4, boom cylinder 15 and rotary ink tank 16 respectively, and wherein pressure selection valve 4 is connected with flow valve 6 by shuttle valve 5; Described steering pump 7 is connected with flow valve 6, switch valve 8 respectively, flow valve 6 is all connected with pressure-gradient control valve 11 by fluid pressure line with switch valve 8, pressure-gradient control valve 11 is connected with steering gear 12, and steering gear 12 is connected with steering cylinder 13, is also connected with sequence valve 10 between wherein said flow valve 6 and switch valve 8.Strainer 9 is provided with between described hydraulic oil container 2 and return line.Described steering pump 7 the 3rd hydraulic pump of connecting forms duplex pump structure.
In conjunction with above-described embodiment, the utility model course of action operationally and principle as follows:
When complete machine just starts, hydraulic system of working does not have build-up pressure, now steering wheel rotation, and driving steering gear 12 by steering wheel, is whole hydraulic system build-up pressure by steering.By the pressure comparison of shuttle valve 5, by metering-in control system high for the pressure of selection.Make pressure be reduced to working pressure range needed for pilot system through pressure selection valve 4 again, thus supply pilot valve 3 work.The main valve plug being promoted banked direction control valves 14 by the hydraulic oil liquid of pilot valve 3 makes equipment produce corresponding action.Now, working barrel 1 creates pressure, and through the pressure comparison of shuttle valve 5, hydraulic oil liquid supplies pilot valve 3 as pilot control after pressure selection valve 4 reduces pressure.
Restarting after shutdown, there is back pressure in the rodless cavity of boom cylinder 15, and this pressure supplies pilot valve 3 thus promotes the main valve plug motion of banked direction control valves 14 after pressure selection valve 4, makes equipment produce corresponding action.Now, working barrel 1 creates pressure, and through the pressure comparison of shuttle valve 5, hydraulic oil liquid supplies pilot valve 3 as pilot control after pressure selection valve 4 reduces pressure.Hydraulic system constantly circulates said process.
By increasing switch valve 8 in loader hydraulic system, flow valve 6, steering pump 7 connect duplex pump, the sequence valve 10 that the 3rd hydraulic pump is formed, loader working barrel 1, steering pump 7 discharge capacity can be reduced, the rotating speed of motor is measured by flow valve 6, then output pressure control signal passes to switch valve 8, control connect duplex pump that the 3rd hydraulic pump forms of steering pump 7 by switch valve 8 and realize motor when low speed to steering hydraulic system fuel feeding, thus the problem of steering pump 7 fuel delivery deficiency when solving time of engine low speed.When high engine speeds operates, said apparatus can, to hydraulic system of working fuel feeding, avoid steering hydraulic system to there is larger power loss.
When lifting operating mode, hydraulic system of working does not need large discharge, now, sequence valve 10 can detect the pressure of work system, and when pressure is higher than emergence operating mode, sequence valve 10 can cut off the interflow flow of steering pump 7 to hydraulic system of working, make to enter cooling system more than flow, through oil-tank filtering device 9, get back in hydraulic oil container 2, the temperature of hydraulic oil can be reduced.Improve the stability of hydraulic system.
Claims (3)
1. a loader hydraulic system, comprise hydraulic oil container (2), it is characterized in that: described hydraulic oil container (2) is connected with working barrel (1), steering pump (7), described working barrel (1) is connected with banked direction control valves (14), shuttle valve (5), switch valve (8) respectively by fluid pressure line, described banked direction control valves (14) is connected with pilot valve (3), pressure selection valve (4), boom cylinder (15) and rotary ink tank (16) respectively, and wherein pressure selection valve (4) is connected with flow valve (6) by shuttle valve (5); Described steering pump (7) is connected with flow valve (6), switch valve (8) respectively, flow valve (6) is all connected with pressure-gradient control valve (11) by fluid pressure line with switch valve (8), pressure-gradient control valve (11) is connected with steering gear (12), steering gear (12) is connected with steering cylinder (13), is also connected with sequence valve (10) between wherein said flow valve (6) and switch valve (8).
2. loader hydraulic system according to claim 1, is characterized in that: be provided with strainer (9) between described hydraulic oil container (2) and return line.
3. loader hydraulic system according to claim 1 and 2, is characterized in that: described steering pump (7) series connection the 3rd hydraulic pump forms duplex pump structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520415630.5U CN204803957U (en) | 2015-06-16 | 2015-06-16 | Loader hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520415630.5U CN204803957U (en) | 2015-06-16 | 2015-06-16 | Loader hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204803957U true CN204803957U (en) | 2015-11-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520415630.5U Active CN204803957U (en) | 2015-06-16 | 2015-06-16 | Loader hydraulic system |
Country Status (1)
| Country | Link |
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| CN (1) | CN204803957U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105864130A (en) * | 2016-05-30 | 2016-08-17 | 山东临工工程机械有限公司 | Load sensing hydraulic system of land leveler |
| CN105937511A (en) * | 2016-06-22 | 2016-09-14 | 河南瑞创通用机械制造有限公司 | Hydraulic system assembly and tractor |
| CN106836363A (en) * | 2016-12-30 | 2017-06-13 | 山东临工工程机械有限公司 | Loader hydraulic system |
| CN109533018A (en) * | 2018-11-26 | 2019-03-29 | 雷沃重工股份有限公司 | Farm equipment hydraulic system and farm equipment |
-
2015
- 2015-06-16 CN CN201520415630.5U patent/CN204803957U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105864130A (en) * | 2016-05-30 | 2016-08-17 | 山东临工工程机械有限公司 | Load sensing hydraulic system of land leveler |
| CN105937511A (en) * | 2016-06-22 | 2016-09-14 | 河南瑞创通用机械制造有限公司 | Hydraulic system assembly and tractor |
| CN105937511B (en) * | 2016-06-22 | 2019-02-19 | 河南瑞创通用机械制造有限公司 | Hydraulic system assembly and tractor |
| CN106836363A (en) * | 2016-12-30 | 2017-06-13 | 山东临工工程机械有限公司 | Loader hydraulic system |
| CN109533018A (en) * | 2018-11-26 | 2019-03-29 | 雷沃重工股份有限公司 | Farm equipment hydraulic system and farm equipment |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |