CN106050762A - Unloading hydraulic system - Google Patents
Unloading hydraulic system Download PDFInfo
- Publication number
- CN106050762A CN106050762A CN201610561785.9A CN201610561785A CN106050762A CN 106050762 A CN106050762 A CN 106050762A CN 201610561785 A CN201610561785 A CN 201610561785A CN 106050762 A CN106050762 A CN 106050762A
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- CN
- China
- Prior art keywords
- dosing pump
- valve
- pressure
- load
- oil duct
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an unloading hydraulic system. The unloading hydraulic system comprises a hydraulic oil tank, a first constant delivery pump, a second constant delivery pump, an unloading valve and a two-section unloading valve, wherein an inlet of the first constant delivery pump and an inlet of the second constant delivery pump are connected with the hydraulic oil tank; an outlet of the first constant delivery pump communicates with an outlet of the second constant delivery pump through a one-way valve; the unloading valve is separately connected with the outlet of the first constant delivery pump and the outlet of the second constant delivery pump; the second constant delivery pump is unloaded according to the pressure of the outlet of the first constant delivery pump; an inlet of the two-section unloading valve is connected with an outlet of the one-way valve; and the overflow pressure of the first constant delivery pump and the overflow pressure of the second constant delivery pump are automatically adjusted according to loading pressure. By adoption of the mode, the unloading hydraulic system disclosed by the invention has the advantages that the control over fine movement can be realized, and low-pressure unloading, confluence, power control and forced unloading function are realized.
Description
Technical field
The present invention relates to Hydraulic Field, particularly relate to a kind of holding state Low-pressure load discharge, duty according to load pressure
Power adjusts oil pressure relief and the hydraulic system according to another hydraulic pump off-load of hydraulic pump outlet Stress control.
Background technology
Use in the hydraulic system of dosing pump, have two kinds of canonical systems, the first: dosing pump adds the hydraulic pressure that overflow valve is constituted
System, this system overflow valve oil pressure relief setting value is constant, and system power loss is serious；It two is: dosing pump adds three-way pressure
The load sensitive control system that compensator is constituted, in this system, the oil pressure relief of dosing pump is with load change, and oil pressure relief is equal to
Highest load pressure adds three-way pressure compensating device and sets pressure (generally 14 ~ 20bar), when individual actuator attonity, fixed
Amount pump discharge oil pressure relief is that three-way pressure compensating device sets pressure.The power loss of two kinds of systems is bigger.
Summary of the invention
The technical problem that present invention mainly solves is to provide a kind of off-load hydraulic system, it is possible to realize fine motion ability,
Realize Low-pressure load discharge, interflow, power control and force unloading function.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of off-load hydraulic system, bag
Include hydraulic oil container, the first dosing pump, the second dosing pump, unloader and two sections of unloaders, described first dosing pump and second quantitative
The entrance of pump is connected with hydraulic oil container, is connected by check valve between the first dosing pump and the second quantitative delivery side of pump, described
Unloader delivery side of pump quantitative with the first dosing pump and second respectively is connected, according to the outlet pressure of the first dosing pump to second
Dosing pump carries out off-load, and the described entrance of two sections of unloaders is connected with the outlet of check valve, automatically controls according to load pressure
First dosing pump and the oil pressure relief of the second dosing pump.
In a preferred embodiment of the present invention, the outlet of described two sections of unloaders connects with oil duct T, control oil-in with
Oil duct Ls connects, and controls oil export and connects with oil duct Ts, automatically controls the first dosing pump and second according to oil duct Ls pressure size
The oil pressure relief of dosing pump.
In a preferred embodiment of the present invention, on described unloader connect have relief valve and choke valve, relief valve according to
First dosing pump pressure is opened, and makes the second dosing pump by unloader off-load, going out of described unloader by the pressure reduction of choke valve
Mouth connects with oil duct T-phase.
In a preferred embodiment of the present invention, described unloader is also associated with electromagnetic valve, described relief valve and electromagnetism
The outlet of valve is connected with oil duct Ts, and the second dosing pump off-load forced by described electromagnetic valve.
In a preferred embodiment of the present invention, connect between described first dosing pump and T oil duct and have main safety valve.
In a preferred embodiment of the present invention, connect between described oil duct Ls and oil duct Ts and have Ls relief valve and Ls throttling
Valve.
In a preferred embodiment of the present invention, described first dosing pump is also associated with multiple execution machine being set up in parallel
Structure.
In a preferred embodiment of the present invention, one end of described oil duct T and oil duct Ts connects with hydraulic oil container.
The invention has the beneficial effects as follows: off-load hydraulic system of the present invention, it is possible to realize fine motion ability, it is achieved low pressure is unloaded
Lotus, interflow, power control and force unloading function.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing, wherein:
Fig. 1 is the structural representation that off-load hydraulic pressure system of the present invention unifies preferred embodiment；
In accompanying drawing, the labelling of each parts is as follows: 1, hydraulic oil container, the 2, first dosing pump, the 3, second dosing pump, and 4, check valve, 5, main
Relief valve, 6, Ls relief valve, 7, Ls choke valve, 8, choke valve, 9, electromagnetic valve, 10, relief valve, 11, unloader, 12, two ends unload
Lotus valve, 13, oil duct Ls, 14, oil duct T, 15, oil duct Ts, 16, actuator.
Detailed description of the invention
Technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described enforcement
Example is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, this area is common
All other embodiments that technical staff is obtained under not making creative work premise, broadly fall into the model of present invention protection
Enclose.
Referring to Fig. 1, a kind of off-load hydraulic system, including hydraulic oil container the 1, first dosing pump the 2, second dosing pump 3, off-load
Valve 11 and two sections of unloaders 12, the entrance of the first dosing pump 2 and the second dosing pump 3 is connected with hydraulic oil container 1, the first dosing pump 2
And second dosing pump 3 outlet between be connected by check valve 4, unloader 11 is quantitative with the first dosing pump 2 and second respectively
The outlet of pump 3 is connected, and according to the outlet pressure of the first dosing pump 2, second dosing pump 3 is carried out off-load, two sections of unloaders 12
Entrance is connected with the outlet of check valve 4, automatically controls the first dosing pump 2 and overflow of the second dosing pump 3 according to load pressure
Pressure.
It addition, the outlet of two sections of unloaders 12 connects with oil duct T14, control oil-in and connect with oil duct Ls13, control oil
Outlet connects with oil duct Ts15, according to oil duct Ls13 pressure size, the first dosing pump 2 and the second dosing pump 3 is carried out off-load.
Having relief valve 10 and choke valve 8 it addition, connect on unloader 11, relief valve 10 is beaten according to the first dosing pump 2 pressure
Opening, make the second dosing pump 3 by unloader 11 off-load by the pressure reduction of choke valve 8, the outlet of unloader 11 is connected with oil duct T14
Logical.
It addition, the outlet being also associated with electromagnetic valve 9, relief valve 10 and electromagnetic valve 9 on unloader 11 is connected with oil duct Ts13
Logical, the second dosing pump 3 off-load forced by electromagnetic valve 9.
Main safety valve 10 is had it addition, connect between the first dosing pump 2 and T oil duct 14.
Ls relief valve 6 and Ls choke valve 7 is had it addition, connect between oil duct Ls13 and oil duct Ts15.
It addition, be also associated with multiple actuator 16 being set up in parallel on the first dosing pump 2.
It addition, one end of oil duct T14 and oil duct Ts15 connects with hydraulic oil container 1.
Off-load hydraulic system specific works principle of the present invention is as follows:
First dosing pump controls the second dosing pump off-load: when the first dosing pump 2 outlet pressure reach relief valve 10 set pressure time,
Relief valve 10 is opened, and restriction 8 has fluid to pass through, and restriction 8 two ends pressure reduction produces pressure reduction, when this pressure reduction is more than unloader 11
When spring sets pressure, the second dosing pump 3 exports fluid by unloader 11 off-load.
First dosing pump 2 collaborates with the second dosing pump 3: when the first dosing pump 2 outlet pressure sets pressure less than relief valve 10
During power, the second dosing pump 3 is through check valve 4 and the 2-in-1 stream of the first dosing pump.
First dosing pump 2 and the second dosing pump 3 two-part off-load: when oil duct Ls13 pressure is less than the elder generation of two sections of unloaders 12
When pilot valve spring sets pressure, the first dosing pump 2 and the second dosing pump 3 are through the main valve off-load of two sections of unloaders 12；Work as oil duct
When Ls13 pressure sets pressure higher than the pilot valve spring of two sections of unloaders 12, the first dosing pump 2 and the second dosing pump 3 are through two sections
Unloader 11 overflow, oil pressure relief is passage Ls13 pressure and two sections of unloader 11 main valves setting pressure sums.
Off-load hydraulic system of the present invention is provided with unloader, electromagnetic valve, two sections of unloaders so that the first dosing pump controls the
The second dosing pump off-load, the first dosing pump and two sections of Low-pressure load discharges of the second dosing pump are forced in two dosing pump off-loads, electromagnetic valve, it is achieved
Dosing pump Low-pressure load discharge, interflow, power control and force unloading function, reach fine motion ability, power match, energy-conservation
Effect.
It is different from prior art, off-load hydraulic system of the present invention, it is possible to realize fine motion ability, it is achieved Low-pressure load discharge,
Interflow, power control and force unloading function.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description is made convert, or are directly or indirectly used in other relevant technology neck
Territory, is the most in like manner included in the scope of patent protection of the present invention.
Claims (8)
1. an off-load hydraulic system, it is characterised in that include hydraulic oil container, the first dosing pump, the second dosing pump, unloader and
Two sections of unloaders, the entrance of described first dosing pump and the second dosing pump is connected with hydraulic oil container, and the first dosing pump and second is determined
It is connected by check valve between amount delivery side of pump, described unloader delivery side of pump phase quantitative with the first dosing pump and second respectively
Connecting, according to the outlet pressure of the first dosing pump, the second dosing pump is carried out off-load, the entrance of described two sections of unloaders is with unidirectional
The outlet of valve is connected, and automatically adjusts the first dosing pump and the second dosing pump oil pressure relief according to load pressure.
Off-load hydraulic system the most according to claim 1, it is characterised in that the outlet of described two sections of unloaders and oil duct T
Connection, controls oil-in and connects with oil duct Ls, controls oil export and connects with oil duct Ts, automatically adjusts according to oil duct Ls pressure size
First dosing pump and the second dosing pump oil pressure relief.
Off-load hydraulic system the most according to claim 2, it is characterised in that connect on described unloader and have relief valve and joint
Stream valve, relief valve is opened according to the first dosing pump pressure, makes the second dosing pump pass through unloader off-load by the pressure reduction of choke valve,
The outlet of described unloader connects with oil duct T-phase.
Off-load hydraulic system the most according to claim 3, it is characterised in that be also associated with electromagnetic valve on described unloader,
Described relief valve is connected with oil duct Ts with the outlet of electromagnetic valve, and the second dosing pump off-load forced by described electromagnetic valve.
5. according to the arbitrary described off-load hydraulic system of claim 2-4, it is characterised in that described first dosing pump and T oil duct
Between connect have main safety valve.
Off-load hydraulic system the most according to claim 5, it is characterised in that connect between described oil duct Ls and oil duct Ts and have
Ls relief valve and Ls choke valve.
Off-load hydraulic system the most according to claim 6, it is characterised in that be also associated with multiple on described first dosing pump
The actuator being set up in parallel.
Off-load hydraulic system the most according to claim 6, it is characterised in that described oil duct T and one end of oil duct Ts and liquid
Force feed case connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610561785.9A CN106050762B (en) | 2016-07-18 | 2016-07-18 | Off-load hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610561785.9A CN106050762B (en) | 2016-07-18 | 2016-07-18 | Off-load hydraulic system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106050762A true CN106050762A (en) | 2016-10-26 |
| CN106050762B CN106050762B (en) | 2018-02-27 |
Family
ID=57187717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610561785.9A Active CN106050762B (en) | 2016-07-18 | 2016-07-18 | Off-load hydraulic system |
Country Status (1)
| Country | Link |
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| CN (1) | CN106050762B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5670106A (en) * | 1979-11-12 | 1981-06-11 | Daikin Ind Ltd | Combination fluid circuit |
| JPS57177404A (en) * | 1981-04-25 | 1982-11-01 | Daikin Ind Ltd | Combined flow type flow control circuit associated with pressure compensation |
| CN2610133Y (en) * | 2003-03-14 | 2004-04-07 | 柯坚 | Quantitative variable confluent system of loader |
| CN101939550A (en) * | 2008-02-20 | 2011-01-05 | 株式会社小松制作所 | Oil pressure system and valve assembly used in oil pressure system |
| CN102229328A (en) * | 2011-05-05 | 2011-11-02 | 四川大学 | Vehicle mechanical energy-saving hydraulic system with multi-pump confluence |
| CN203743135U (en) * | 2014-03-25 | 2014-07-30 | 扬州锻压机床股份有限公司 | Energy-saving hydraulic circuit of press machine |
| CN204386982U (en) * | 2014-12-31 | 2015-06-10 | 淮安威博液压有限公司 | A kind of lifting machine double pump hydraulic unloading power unit |
| CN205895722U (en) * | 2016-07-18 | 2017-01-18 | 江苏恒立液压科技有限公司 | Off -load hydraulic system |
-
2016
- 2016-07-18 CN CN201610561785.9A patent/CN106050762B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5670106A (en) * | 1979-11-12 | 1981-06-11 | Daikin Ind Ltd | Combination fluid circuit |
| JPS57177404A (en) * | 1981-04-25 | 1982-11-01 | Daikin Ind Ltd | Combined flow type flow control circuit associated with pressure compensation |
| CN2610133Y (en) * | 2003-03-14 | 2004-04-07 | 柯坚 | Quantitative variable confluent system of loader |
| CN101939550A (en) * | 2008-02-20 | 2011-01-05 | 株式会社小松制作所 | Oil pressure system and valve assembly used in oil pressure system |
| CN102229328A (en) * | 2011-05-05 | 2011-11-02 | 四川大学 | Vehicle mechanical energy-saving hydraulic system with multi-pump confluence |
| CN203743135U (en) * | 2014-03-25 | 2014-07-30 | 扬州锻压机床股份有限公司 | Energy-saving hydraulic circuit of press machine |
| CN204386982U (en) * | 2014-12-31 | 2015-06-10 | 淮安威博液压有限公司 | A kind of lifting machine double pump hydraulic unloading power unit |
| CN205895722U (en) * | 2016-07-18 | 2017-01-18 | 江苏恒立液压科技有限公司 | Off -load hydraulic system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106050762B (en) | 2018-02-27 |
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