CN106050762B - Off-load hydraulic system - Google Patents
Off-load hydraulic system Download PDFInfo
- Publication number
- CN106050762B CN106050762B CN201610561785.9A CN201610561785A CN106050762B CN 106050762 B CN106050762 B CN 106050762B CN 201610561785 A CN201610561785 A CN 201610561785A CN 106050762 B CN106050762 B CN 106050762B
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- Prior art keywords
- displacement pump
- constant displacement
- valve
- load
- pressure
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Classifications
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- 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 a kind of off-load hydraulic system, including hydraulic oil container, first constant displacement pump, second constant displacement pump, unloading valve and two sections of unloading valves, the entrance of first constant displacement pump and the second constant displacement pump is connected with hydraulic oil container, it is connected between the outlet of first constant displacement pump and the second constant displacement pump by check valve, outlet of the unloading valve respectively with the first constant displacement pump and the second constant displacement pump is connected, off-load is carried out to the second constant displacement pump according to the outlet pressure of the first constant displacement pump, the entrance of two sections of unloading valves is connected with the outlet of check valve, according to the constant displacement pump of load pressure adjust automatically first and the second constant displacement pump oil pressure relief.By the above-mentioned means, off-load hydraulic system of the present invention, can realize fine motion ability, realize Low-pressure load discharge, interflow, Power Control and force unloading function.
Description
Technical field
The present invention relates to Hydraulic Field, is pressed more particularly to a kind of holding state Low-pressure load discharge, working condition according to load
Power adjusts oil pressure relief and the hydraulic system according to another hydraulic pump off-load of a hydraulic pump outlet Stress control.
Background technology
Using in the hydraulic system of constant displacement pump, there is two kinds of canonical systems, one is：Constant displacement pump adds the hydraulic pressure that overflow valve is formed
System, this system overflow valve oil pressure relief setting value is constant, and system power loss is serious；The second is：Constant displacement pump adds three-way pressure
The load sensitive control system that compensator is formed, the oil pressure relief of constant displacement pump changes with load in this system, and oil pressure relief is equal to
Highest load pressure adds three-way pressure compensating device to set pressure（Generally 14 ~ 20bar）, it is fixed when individual executing agency's attonity
It is that three-way pressure compensating device sets pressure to measure pump discharge oil pressure relief.The power loss of two kinds of systems is larger.
The content of the invention
The present invention solves the technical problem of a kind of off-load hydraulic system is provided, fine motion ability can be realized,
Realize Low-pressure load discharge, interflow, Power Control and force unloading function.
In order to solve the above technical problems, one aspect of the present invention is：A kind of off-load hydraulic system is provided, wrapped
Hydraulic oil container, the first constant displacement pump, the second constant displacement pump, unloading valve and two sections of unloading valves are included, first constant displacement pump and second quantify
The entrance of pump is connected with hydraulic oil container, is connected between the outlet of the first constant displacement pump and the second constant displacement pump by check valve, described
Outlet of the unloading valve respectively with the first constant displacement pump and the second constant displacement pump is connected, according to the outlet pressure of the first constant displacement pump to second
Constant displacement pump carries out off-load, and the entrance of two sections of unloading valves is connected with the outlet of check valve, automatically controlled according to load pressure
The oil pressure relief of first constant displacement pump and the second constant displacement pump.
In a preferred embodiment of the present invention, the outlet of two sections of unloading valves connects with oil duct T, control oil-in with
Oil duct Ls is connected, and control oil export is connected with oil duct Ts, and the first constant displacement pump and second are automatically controlled according to oil duct Ls pressure sizes
The oil pressure relief of constant displacement pump.
In a preferred embodiment of the present invention, be connected with safety valve and choke valve on the unloading valve, safety valve according to
First quantitative pump pressure is opened, and the second constant displacement pump is gone out by unloading valve off-load, the unloading valve by the pressure difference of choke valve
Mouth connects with oil duct T-phase.
In a preferred embodiment of the present invention, magnetic valve, the safety valve and electromagnetism are also associated with the unloading valve
The outlet of valve is connected with oil duct Ts, and the magnetic valve forces the second constant displacement pump off-load.
In a preferred embodiment of the present invention, it is connected with main safety valve between first constant displacement pump and T oil ducts.
In a preferred embodiment of the present invention, Ls safety valves and Ls throttlings are connected between the oil duct Ls and oil duct Ts
Valve.
In a preferred embodiment of the present invention, multiple execution machines being set up in parallel are also associated with first constant displacement pump
Structure.
In a preferred embodiment of the present invention, one end of the oil duct T and oil duct Ts connect with hydraulic oil container.
The beneficial effects of the invention are as follows：Off-load hydraulic system of the present invention, can realize fine motion ability, realize that low pressure is unloaded
Lotus, interflow, Power Control and pressure unloading function.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other
Accompanying drawing, wherein：
Fig. 1 is the structural representation that off-load hydraulic pressure system of the present invention unifies preferred embodiment；
The mark of each part is as follows in accompanying drawing：1st, hydraulic oil container, the 2, first constant displacement pump, the 3, second constant displacement pump, 4, check valve,
5th, main safety valve, 6, Ls safety valves, 7, Ls choke valves, 8, choke valve, 9, magnetic valve, 10, safety valve, 11, unloading valve, 12, two
Hold unloading valve, 13, oil duct Ls, 14, oil duct T, 15, oil duct Ts, 16, executing agency.
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example is only the part of the embodiment of the present invention, rather than whole embodiments.It is common based on the embodiment in the present invention, this area
All other embodiment that technical staff is obtained under the premise of creative work is not made, belong to the model that the present invention protects
Enclose.
Referring to Fig. 1, a kind of off-load hydraulic system, including hydraulic oil container 1, the first constant displacement pump 2, the second constant displacement pump 3, off-load
The entrance of valve 11 and two sections of unloading valves 12, the first constant displacement pump 2 and the second constant displacement pump 3 is connected with hydraulic oil container 1, the first constant displacement pump 2
And second constant displacement pump 3 outlet between be connected by check valve 4, unloading valve 11 is quantitative with the first constant displacement pump 2 and second respectively
The outlet of pump 3 is connected, and off-load is carried out to the second constant displacement pump 3 according to the outlet pressure of the first constant displacement pump 2, two sections of unloading valves 12
Entrance is connected with the outlet of check valve 4, and the overflow of the first constant displacement pump 2 and the second constant displacement pump 3 is automatically controlled according to load pressure
Pressure.
In addition, the outlet of two sections of unloading valves 12 connects with oil duct T14, control oil-in connects with oil duct Ls13, control oil
Outlet is connected with oil duct Ts15, and off-load is carried out to the first constant displacement pump 2 and the second constant displacement pump 3 according to oil duct Ls13 pressure sizes.
In addition, being connected with safety valve 10 and choke valve 8 on unloading valve 11, safety valve 10 is beaten according to the pressure of the first constant displacement pump 2
Open, the second constant displacement pump 3 is connected by the off-load of unloading valve 11, the outlet of unloading valve 11 with oil duct T14 by the pressure difference of choke valve 8
It is logical.
In addition, being also associated with magnetic valve 9 on unloading valve 11, the outlet of safety valve 10 and magnetic valve 9 is connected with oil duct Ts13
Logical, magnetic valve 9 forces the off-load of the second constant displacement pump 3.
In addition, it is connected with main safety valve 10 between the first constant displacement pump 2 and T oil ducts 14.
In addition, Ls safety valves 6 and Ls choke valves 7 are connected between oil duct Ls13 and oil duct Ts15.
In addition, multiple executing agencies 16 being set up in parallel are also associated with the first constant displacement pump 2.
In addition, oil duct T14 and oil duct Ts15 one end connect with hydraulic oil container 1.
Off-load hydraulic system concrete operating principle of the present invention is as follows：
First constant displacement pump controls the second constant displacement pump off-load：When the outlet pressure of the first constant displacement pump 2 reaches the setting pressure of safety valve 10
During power, safety valve 10 is opened, and restriction 8 has fluid by the way that the both ends pressure difference of restriction 8 produces pressure difference, when this pressure difference is more than off-load
During the spring setting pressure of valve 11, the second constant displacement pump 3 outlet fluid passes through the off-load of unloading valve 11.
First constant displacement pump 2 collaborates with the second constant displacement pump 3：When the outlet pressure of the first constant displacement pump 2 is less than the setting pressure of safety valve 10
During power, the second constant displacement pump 3 is through the 2-in-1 stream of constant displacement pump of check valve 4 and first.
First constant displacement pump 2 and the two-part off-load of the second constant displacement pump 3：When elder generation of the oil duct Ls13 pressure less than two sections of unloading valves 12
When pilot valve spring sets pressure, the main valve off-load of the first constant displacement pump 2 and the second constant displacement pump 3 through two sections of unloading valves 12；Work as oil duct
When Ls13 pressure sets pressure higher than guide's valve spring of two sections of unloading valves 12, the first constant displacement pump 2 and the second constant displacement pump 3 are through two sections
The overflow of unloading valve 11, oil pressure relief are that passage Ls13 pressure sets pressure sum with two sections of main valves of unloading valve 11.
Off-load hydraulic system of the present invention is provided with unloading valve, magnetic valve, two sections of unloading valves so that the first constant displacement pump control the
Two constant displacement pump off-loads, magnetic valve force two sections of the second constant displacement pump off-load, the first constant displacement pump and the second constant displacement pump Low-pressure load discharges, realize
Constant displacement pump Low-pressure load discharge, interflow, Power Control and unloading function is forced, reach fine motion ability, power match, energy-conservation
Effect.
Be different from prior art, off-load hydraulic system of the present invention, fine motion ability can be realized, realize Low-pressure load discharge,
Interflow, Power Control and pressure unloading function.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright description is made, or directly or indirectly it is used in other related technology necks
Domain, it is included within the scope of the present invention.
Claims (7)
- A kind of 1. off-load hydraulic system, it is characterised in that including hydraulic oil container, the first constant displacement pump, the second constant displacement pump, unloading valve and Two sections of unloading valves, the entrance of first constant displacement pump and the second constant displacement pump are connected with hydraulic oil container, and the first constant displacement pump and second is determined Measure and be connected by check valve between the outlet of pump, the unloading valve outlet phase with the first constant displacement pump and the second constant displacement pump respectively Connection, off-load is carried out to the second constant displacement pump according to the outlet pressure of the first constant displacement pump, the entrance of two sections of unloading valves with it is unidirectional The outlet of valve is connected, and according to the constant displacement pump of load pressure adjust automatically first and the second constant displacement pump oil pressure relief, described two sections are unloaded The outlet of lotus valve connects with oil duct T, and control oil-in connects with oil duct Ls, and control oil export connects with oil duct Ts, according to oil duct The first constant displacement pump of Ls pressure sizes adjust automatically and the second constant displacement pump oil pressure relief.
- 2. off-load hydraulic system according to claim 1, it is characterised in that be connected with safety valve and section on the unloading valve Valve is flowed, safety valve is opened according to the first quantitative pump pressure, makes the second constant displacement pump by unloading valve off-load by the pressure difference of choke valve, The outlet of the unloading valve connects with oil duct T-phase.
- 3. off-load hydraulic system according to claim 2, it is characterised in that magnetic valve is also associated with the unloading valve, The outlet of the safety valve and magnetic valve is connected with oil duct Ts, and the magnetic valve forces the second constant displacement pump off-load.
- 4. according to any described off-load hydraulic systems of claim 2-3, it is characterised in that first constant displacement pump and oil duct T Between be connected with main safety valve.
- 5. off-load hydraulic system according to claim 4, it is characterised in that be connected between the oil duct Ls and oil duct Ts Ls safety valves and Ls choke valves.
- 6. off-load hydraulic system according to claim 5, it is characterised in that be also associated with first constant displacement pump multiple The executing agency being set up in parallel.
- 7. off-load hydraulic system according to claim 5, it is characterised in that one end and the liquid of the oil duct T and oil duct Ts Press oil case connection.
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 CN106050762A (en) | 2016-10-26 |
| CN106050762B true 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 |
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| Country | Link |
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| CN (1) | CN106050762B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (2)
| 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 |
-
2016
- 2016-07-18 CN CN201610561785.9A patent/CN106050762B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|---|
| CN106050762A (en) | 2016-10-26 |
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