CN205858826U - Excavator oil cylinder oil return unloading valve - Google Patents
Excavator oil cylinder oil return unloading valve Download PDFInfo
- Publication number
- CN205858826U CN205858826U CN201620816598.6U CN201620816598U CN205858826U CN 205858826 U CN205858826 U CN 205858826U CN 201620816598 U CN201620816598 U CN 201620816598U CN 205858826 U CN205858826 U CN 205858826U
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- valve
- pilot control
- control change
- oil return
- excavator
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Abstract
The open a kind of excavator oil cylinder oil return unloading valve of this utility model, including overflow valve, pilot control change-over valve, two-way plug-in valve and check valve, overflow valve is arranged between the pressure port of pilot control change-over valve and guide's end, the direction controlling mouth of pilot control change-over valve is connected with the spring cavity of two-way plug-in valve, is provided with choke valve between pilot control change-over valve guide's end and the junction of overflow valve and the oil return opening of pilot control change-over valve；One end of check valve is connected with guide's end of pilot control change-over valve, and the other end is as the Pil mouth of whole oil return unloading valve.This utility model, on the premise of the relevant hydraulic pressure component parameters such as main valve, main pump and oil cylinder are constant, improve the loss of pipeline return pressure, improves the speed of oil cylinder respective action, optimize the harmony of excavator work, improve the work efficiency of excavator；Reduce the return oil pressure of oil cylinder, improve " explosive force " of excavator respective action, efficiently utilize the energy of system.
Description
Technical field
This utility model relates to a kind of excavator oil cylinder oil return unloading valve, belongs to excavator oil cylinder and controls technical field.
Background technology
At present, excavator, when excavating loading operation, needs swing arm, dipper, scraper bowl mutually coordinated, through excavating, turning round,
Load, reset four-stage completes a work cycle.Excavating, turning round, loading, resetting in four-stage, either phase
Time shortens, and all can improve the working performance of excavator largely.And the speed of excavator action depends on a lot of side
Face, such as: flow system flow, the pressure loss (return oil pressure) of pipeline, or oil cylinder specification (cylinder diameter/bar footpath) etc..Main valve, main pump with
And on the premise of the relevant hydraulic pressure component parameters such as oil cylinder is constant, to optimize the time of a certain action, reduce pressure loss in piping
Method be feasible, this is accomplished by the device of an adjustable back pressure to solve this problem.
Summary of the invention
The problem existed for above-mentioned prior art, this utility model provides a kind of excavator oil cylinder oil return unloading valve,
On the premise of the relevant hydraulic pressure component parameters such as main valve, main pump and oil cylinder are constant, it is possible to decrease pipeline return oil pressure loses, it is achieved
In the case of load is certain, speed of action is adjustable, improves the speed of oil cylinder respective action, optimizes the harmony of excavator work,
Improve the work efficiency of excavator.
To achieve these goals, a kind of excavator oil cylinder oil return unloading valve that this utility model uses, including overflow
Valve, pilot control change-over valve, two-way plug-in valve and check valve, described overflow valve be arranged on pilot control change-over valve pressure port and
Between guide's end, the direction controlling mouth of pilot control change-over valve is connected with the spring cavity of two-way plug-in valve, pilot control change-over valve
It is provided with choke valve between guide's end and the junction of overflow valve and the oil return opening of pilot control change-over valve；One end of check valve and elder generation
Leading control reversal valve guide's end to connect, the other end is as the Pil mouth of whole oil return unloading valve；Two-way plug-in valve and pilot control change
To the oil return opening of valve as the oil return opening of whole oil return unloading valve；The pressure port of two-way plug-in valve and the pressure of pilot control change-over valve
Power mouth communicates.
Wherein, described overflow valve is as relief valve, when oil cylinder rodless cavity occurs that compression shock is opened when exceeding its setting value,
Setting up pressure before choke valve, moment opens pilot control change-over valve so that two-way plug-in valve spool is opened, and release moment is high
Pressure, protects system damage.
Compared with prior art, in this utility model, two-way plug-in valve is controlled by pilot pressure Pil, can be the most real-time
Open to reduce return oil pressure, be provided simultaneously with eliminating the ability of hydraulic shock.In relevant hydraulic pressure units such as main valve, main pump and oil cylinders
On the premise of part parameter constant, improve the loss of pipeline return pressure, it is achieved that in the case of load is certain, speed of action can
Regulation.Improve the speed of oil cylinder respective action, optimize the harmony of excavator work, improve excavation to a certain extent
The work efficiency of machine；Reduce the return oil pressure of oil cylinder, improve " explosive force " of excavator respective action, efficiently utilize
The energy of system.
Accompanying drawing explanation
Fig. 1 is use view of the present utility model.
In figure: 1, overflow valve, 2, pilot control change-over valve, 3, two-way plug-in valve, 4, choke valve, 5, check valve, 6, main valve,
7, bucket arm cylinder.
Detailed description of the invention
The utility model is described in further detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of excavator oil cylinder oil return unloading valve, including overflow valve 1, pilot control change-over valve 2, two-way
Inserted valve 3 and check valve 5, described overflow valve 1 is arranged between the pressure port of pilot control change-over valve 2 and guide's end, and guide is controlled
The direction controlling mouth of reversal valve 2 processed is connected with the spring cavity of two-way plug-in valve 3, pilot control change-over valve 2 guide's end and overflow valve 1
Junction and the oil return opening of pilot control change-over valve 2 between be provided with choke valve 4；Commutate with pilot control in one end of check valve 5
Valve 2 guide's end connects, and the other end is as the Pil mouth of whole oil return unloading valve；Two-way plug-in valve 3 and pilot control change-over valve 2
Oil return opening is as the oil return opening of whole oil return unloading valve；The pressure port of two-way plug-in valve 3 and the pressure port of pilot control change-over valve 2
Communicate.
Illustrate as a example by bucket arm cylinder:
In actual test process, the discovery big chamber of bucket arm cylinder is when oil return, and return oil pressure is higher, have impact on and puts outside dipper
Discharge rate.It is arranged on the application example in the big chamber of bucket arm cylinder with regard to unloader below to be analyzed:
As it is shown in figure 1, this utility model excavator oil cylinder oil return unloading valve (in square frame) includes limiting big cavity pressure
Two-way plug-in valve 3, choke valve 4 and the check valve 5 that overflow valve 1, pilot control change-over valve 2, control oil return connect with fuel tank.Actual
In work, when the loculus oil-feed of bucket arm cylinder 7, big chamber oil return, control loculus guide oil and connect with quick oil return apparatus Pil mouth,
Pilot control change-over valve 2 is in right position, makes two-way plug-in valve 3 spring cavity directly connect with fuel tank T, and two-way plug-in valve 3 spool is opened
Open, from main valve 6 and the oil return simultaneously of oil return unloading valve, it is achieved the big chamber quick oil return of hydraulic oil low pressure loss.
When the big chamber oil-feed of bucket arm cylinder 7, loculus oil return, Pil mouth no pressure, pilot control change-over valve 2 is in left position, and two
Logical inserted valve 3 spring cavity connects with big cavity pressure oil phase so that two-way plug-in valve 3 spool is closed, and breaks with fuel tank T
Opening, at A, pressure oil enters the big chamber of oil cylinder by bleed off circuit, it is achieved regular event.Overflow valve 1 is as relief valve, when oil cylinder is big
Chamber occurs that compression shock is opened when exceeding its setting value, sets up pressure before choke valve 4, and moment opens pilot control change-over valve 2,
Two-way plug-in valve 3 spool is opened, discharges instantaneous pressure, protect system damage.Check valve 5 can avoid pilot pressure
Directly release from Pil mouth, it is achieved the instantaneous unlatching of two-way plug-in valve 3.
From said structure, this utility model is constant at relevant hydraulic pressure component parameters such as main valve, main pump and oil cylinders
Under premise, improve the loss of pipeline return pressure, it is achieved that in the case of load is certain, speed of action scalable, improve
The speed of oil cylinder respective action, optimizes the harmony of excavator work, improves the work effect of excavator to a certain extent
Rate；Two-way plug-in valve is controlled by pilot pressure Pil, can open the most in real time to reduce return oil pressure, is provided simultaneously with eliminating
The ability of hydraulic shock, while reducing the return oil pressure of oil cylinder, improves " explosive force " of excavator respective action, effectively
Make use of the energy of system.
Claims (2)
1. an excavator oil cylinder oil return unloading valve, it is characterised in that include overflow valve (1), pilot control change-over valve (2),
Two-way plug-in valve (3) and check valve (5), described overflow valve (1) is arranged on pressure port and guide's end of pilot control change-over valve (2)
Between, the direction controlling mouth of pilot control change-over valve (2) is connected with the spring cavity of two-way plug-in valve (3), pilot control change-over valve
(2) it is provided with choke valve (4) between the oil return opening of guide's end and the junction of overflow valve (1) and pilot control change-over valve (2)；Unidirectional
One end of valve (5) is connected with pilot control change-over valve (2) guide's end, and the other end is as the Pil mouth of whole oil return unloading valve；Two-way
The oil return opening of inserted valve (3) and pilot control change-over valve (2) is as the oil return opening of whole oil return unloading valve；Two-way plug-in valve (3)
Pressure port and the pressure port of pilot control change-over valve (2) communicate.
A kind of excavator oil cylinder oil return unloading valve the most according to claim 1, it is characterised in that described overflow valve (1)
As relief valve, when oil cylinder rodless cavity occurs that compression shock is opened when exceeding its setting value, set up pressure choke valve (4) is front,
Moment open pilot control change-over valve (2) so that two-way plug-in valve (3) spool is opened, discharge instantaneous pressure, protection system from
Destroy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620816598.6U CN205858826U (en) | 2016-07-29 | 2016-07-29 | Excavator oil cylinder oil return unloading valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620816598.6U CN205858826U (en) | 2016-07-29 | 2016-07-29 | Excavator oil cylinder oil return unloading valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205858826U true CN205858826U (en) | 2017-01-04 |
Family
ID=57654153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620816598.6U Active CN205858826U (en) | 2016-07-29 | 2016-07-29 | Excavator oil cylinder oil return unloading valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205858826U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059101A (en) * | 2019-11-07 | 2020-04-24 | 中冶宝钢技术服务有限公司 | Big arm oil cylinder control valve group |
-
2016
- 2016-07-29 CN CN201620816598.6U patent/CN205858826U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059101A (en) * | 2019-11-07 | 2020-04-24 | 中冶宝钢技术服务有限公司 | Big arm oil cylinder control valve group |
| CN111059101B (en) * | 2019-11-07 | 2022-01-11 | 中冶宝钢技术服务有限公司 | Big arm oil cylinder control valve group |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |