CN112460078A - Oil drainage hydraulic safety system - Google Patents
Oil drainage hydraulic safety system Download PDFInfo
- Publication number
- CN112460078A CN112460078A CN202011436273.2A CN202011436273A CN112460078A CN 112460078 A CN112460078 A CN 112460078A CN 202011436273 A CN202011436273 A CN 202011436273A CN 112460078 A CN112460078 A CN 112460078A
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- China
- Prior art keywords
- oil
- module
- valve
- communicated
- electromagnetic directional
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- 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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- 239000003921 oil Substances 0.000 description 74
- 239000010720 hydraulic oil Substances 0.000 description 13
- 238000001514 detection method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
The invention belongs to the technical field of hydraulic pressure, and particularly relates to an oil discharge hydraulic safety system which comprises a B1 module, a B2 module and a B3 module, wherein an oil pump is communicated with an oil port E in the B2 module through an oil inlet P of the B1 module, the oil port E is communicated with a large cavity of a variable amplitude oil cylinder, and the oil port E is also communicated with a spring cavity of a balance valve in a B2 module; an oil port D of the balance valve is communicated with the small cavity of the variable amplitude oil cylinder, and an oil port F of the balance valve is connected with an oil tank through an oil return port T of the B1 module; the B3 module comprises an electromagnetic directional valve I, a pressure reducing valve, a one-way valve, a pressure sensor, an energy accumulator and an electromagnetic directional valve II which are sequentially communicated, the electromagnetic directional valve I is communicated with an oil port D of the balance valve, and the electromagnetic directional valve II is communicated with an oil tank; the electromagnetic directional valve I is controlled by the change-over switch I to switch on and off the oil path, and the electromagnetic directional valve II is controlled by the change-over switch II to switch on and off the oil path. By additionally arranging a pressure reducing system, formed high-pressure oil is converted into low-pressure oil and then flows back to the oil tank.
Description
Technical Field
The invention belongs to the technical field of hydraulic pressure, and particularly relates to an oil drainage hydraulic safety system.
Background
At present, engineering machinery returns oil and directly returns an oil tank, and often a cavity of an oil cylinder generates an oil trapping state due to too heavy tooling, high-pressure oil is easy to form, the hydraulic oil is quickly released to return to the hydraulic oil tank, and the safety problem of the hydraulic oil tank can be solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an oil discharge hydraulic safety system, which changes formed high-pressure oil into low-pressure oil and then returns the low-pressure oil to an oil tank by additionally arranging a pressure reduction system.
The invention is realized by the following technical scheme: an oil discharge hydraulic safety system comprises a B1 module, a B2 module and a B3 module, wherein an oil pump is communicated with an oil port E in the B2 module through an oil inlet P of the B1 module, the oil port E is communicated with a large cavity of a variable amplitude oil cylinder, and the oil port E is also communicated with a spring cavity of a balance valve in a B2 module; an oil port D of the balance valve is communicated with the small cavity of the variable amplitude oil cylinder, and an oil port F of the balance valve is connected with an oil tank through an oil return port T of the B1 module; the B3 module comprises an electromagnetic directional valve I, a pressure reducing valve, a one-way valve, a pressure sensor, an energy accumulator and an electromagnetic directional valve II which are sequentially communicated, the electromagnetic directional valve I is communicated with an oil port D of the balance valve, and the electromagnetic directional valve II is communicated with an oil tank; the electromagnetic directional valve I is controlled by the change-over switch I to switch on and off the oil path, and the electromagnetic directional valve II is controlled by the change-over switch II to switch on and off the oil path.
Furthermore, the change-over switch I and the change-over switch II are both manual change-over switches.
Furthermore, the change-over switch I and the change-over switch II are automatic switches controlled by a controller arranged in a hydraulic system.
Further, a sensor interface is arranged on the B2 module.
The invention has the beneficial effects that: by additionally arranging the pressure reducing system, when the return oil pressure is too high, the pressure reducing system is opened, and formed high-pressure oil is converted into low-pressure oil and then flows back to the oil tank. When the pressure is not enough to open the pressure reducing system, the oil directly returns to the oil tank through the balance valve.
Drawings
FIG. 1 is a hydraulic schematic of the present invention;
in the figure, the hydraulic control system comprises an electromagnetic directional valve I, an electromagnetic directional valve 2, a pressure reducing valve 3, a one-way valve 4, a pressure sensor 5, an energy accumulator 6, an electromagnetic directional valve II, an electromagnetic directional valve 7, a balance valve 8 and a variable amplitude oil cylinder.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
As shown in fig. 1, the oil discharge hydraulic safety system comprises a B1 module, a B2 module and a B3 module, wherein the B1 module may or may not be provided with corresponding hydraulic components according to the requirements of the hydraulic system, a balance valve 7 is arranged in the B2 module, and the B3 module is used as a pressure reducing system of the invention and comprises an electromagnetic directional valve i 1, a pressure reducing valve 2, a one-way valve 3, a pressure sensor 4, an accumulator 5 and an electromagnetic directional valve ii 6 which are sequentially communicated. The oil pump is communicated with an oil port E in the B2 module through an oil inlet P of the B1 module, the oil port E is communicated with a large cavity of the amplitude variation oil cylinder 8, and the oil port E is also communicated with a spring cavity of a balance valve 7 in the B2 module. An oil port D of the balance valve 7 is communicated with a small cavity of the variable amplitude oil cylinder 8, and an oil port F of the balance valve 7 is connected with an oil tank through an oil return port T of the B1 module. The electromagnetic directional valve I1 is communicated with an oil port D of the balance valve 7, and the electromagnetic directional valve II 6 is communicated with an oil tank; the electromagnetic directional valve I1 is controlled by the change-over switch I to switch on and off the oil path, and the electromagnetic directional valve II 6 is controlled by the change-over switch II to switch on and off the oil path.
The working process of the hydraulic system is as follows: 1. when the normal work is carried out: the oil pump supplies oil to an oil inlet P of the B1 module, one path of hydraulic oil reaches the large cavity of the amplitude-variable oil cylinder 8 through an oil port E of the B2 module to push the oil cylinder to extend out, and the other path of hydraulic oil reaches the spring cavity of the balance valve 7 through an oil port E of the B2 module to control the balance valve to be opened. At this time, since the change-over switch 1 is in the closed state, the oil path of the electromagnetic directional valve i 1 in the B3 module is not communicated, and the hydraulic oil in the small cavity of the luffing cylinder 8 can only flow back to the oil tank through the oil port D and the oil port F of the balance valve 7 in the B2 module and the oil return port T of the B1 module.
2. Because the working device is heavier, when the amplitude variation oil cylinder reaches the balance valve to form trapped pressure: the change over switch I is opened, the electromagnetic directional valve I1 is opened, a part of hydraulic oil in the small cavity of the amplitude variation oil cylinder 8 flows to the electromagnetic directional valve I1, the oil sequentially flows through the pressure reducing valve 2, the one-way valve 3, the pressure sensor 4 and the energy accumulator 5, the pressure reducing valve 2 reduces the pressure of the high-pressure oil, the energy accumulator 5 stores the hydraulic oil, when the pressure P2 value of the energy accumulator is not greater than the safety pressure P1 of the oil tank, the change over switch II is opened in a closed state, the electromagnetic directional valve II 6 is opened, and the hydraulic oil returns to the oil tank.
The change-over switch I and the change-over switch II are both manual change-over switches. A pressure detection element is arranged between the balance valve 7 and the electromagnetic directional valve I1, the switch I is manually opened according to displayed pressure, and the switch II is manually opened according to the pressure displayed by the pressure sensor 4.
Furthermore, the change-over switch I and the change-over switch II are automatic switches controlled by a controller arranged in a hydraulic system. Because the working device is heavier, when the amplitude variation oil cylinder reaches the balance valve to form trapped pressure: whether the pressure exceeds a safety range is judged through the controller, the pressure value exceeds a safety value, the controller outputs signals to the electromagnetic valve reversing valve I1, the electromagnetic valve I1 is opened, a part of hydraulic oil in the small cavity of the amplitude-variable oil cylinder 8 flows to the electromagnetic valve I1, the hydraulic oil sequentially flows through the pressure reducing valve 2, the check valve 3, the pressure sensor 4 and the energy accumulator 5, the pressure reducing valve 2 reduces the pressure of the high-pressure oil, the energy accumulator 5 stores the hydraulic oil, when the pressure P2 value of the energy accumulator is not larger than the safety pressure P1 of the oil tank, the output signals are controlled, the electromagnetic valve II 6 is opened, and the hydraulic oil returns to the oil tank.
A pressure detection element is arranged between the balance valve 7 and the electromagnetic directional valve I1, signals are output through a controller according to displayed pressure, the electromagnetic directional valve I1 is closed, and signals are output through the controller according to the pressure displayed by the pressure sensor 4, and the electromagnetic directional valve II 6 is opened.
As an improvement of this embodiment, a sensor interface is provided on the B2 module, and is used for detecting the hydraulic system when the hydraulic system fails.
Claims (4)
1. A hydraulic safety system for oil drainage is characterized in that: the oil pump is communicated with an oil port E in the B2 module through an oil inlet P of the B1 module, the oil port E is communicated with a large cavity of a variable amplitude oil cylinder (8), and the oil port E is also communicated with a spring cavity of a balance valve (7) in the B2 module; an oil port D of the balance valve (7) is communicated with a small cavity of the variable amplitude oil cylinder (8), and an oil port F of the balance valve (7) is connected with an oil tank through an oil return port T of the B1 module; the B3 module comprises an electromagnetic directional valve I (1), a pressure reducing valve (2), a one-way valve (3), a pressure sensor (4), an energy accumulator (5) and an electromagnetic directional valve II (6) which are sequentially communicated, the electromagnetic directional valve I (1) is communicated with an oil port D of a balance valve (7), and the electromagnetic directional valve II (6) is communicated with an oil tank; the electromagnetic directional valve I (1) is controlled by the change-over switch I to switch on and off the oil path, and the electromagnetic directional valve II (6) is controlled by the change-over switch II to switch on and off the oil path.
2. An oil drain hydraulic safety system as claimed in claim 1, wherein: the change-over switch I and the change-over switch II are both manual change-over switches.
3. An oil drain hydraulic safety system as claimed in claim 1, wherein: and the change-over switch I and the change-over switch II are automatically switched on and off under the control of a controller arranged in a hydraulic system.
4. An oil drain hydraulic safety system as claimed in claim 1, wherein: and a sensor interface is arranged on the B2 module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011436273.2A CN112460078B (en) | 2020-12-10 | 2020-12-10 | Hydraulic safety system for oil drainage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011436273.2A CN112460078B (en) | 2020-12-10 | 2020-12-10 | Hydraulic safety system for oil drainage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112460078A true CN112460078A (en) | 2021-03-09 |
| CN112460078B CN112460078B (en) | 2024-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011436273.2A Active CN112460078B (en) | 2020-12-10 | 2020-12-10 | Hydraulic safety system for oil drainage |
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| Country | Link |
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| CN (1) | CN112460078B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756791A (en) * | 2012-07-11 | 2012-10-31 | 武汉船用机械有限责任公司 | Hydraulic anchor machine braking system with two-gear speed adjustment |
| CN103130099A (en) * | 2013-03-11 | 2013-06-05 | 徐工集团工程机械股份有限公司 | Crawler crane mast lifting hydraulic control system and method |
| CN104071709A (en) * | 2014-07-18 | 2014-10-01 | 徐州重型机械有限公司 | Fixed fly jib stepless amplitude-variation control system for crane and crane |
| JP2017002478A (en) * | 2015-06-04 | 2017-01-05 | 日立建機株式会社 | Pile driver |
| CN107934807A (en) * | 2017-12-28 | 2018-04-20 | 徐工集团工程机械有限公司 | The variable amplitude hydraulic system and lorry-mounted crane of crane |
| CN111350703A (en) * | 2020-03-11 | 2020-06-30 | 长沙中联恒通机械有限公司 | Control valve group, sliding system, erecting device and control method |
| CN111894918A (en) * | 2020-08-21 | 2020-11-06 | 中铁工程机械研究设计院有限公司 | Oil cylinder lifting system and oil cylinder lifting control method |
-
2020
- 2020-12-10 CN CN202011436273.2A patent/CN112460078B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756791A (en) * | 2012-07-11 | 2012-10-31 | 武汉船用机械有限责任公司 | Hydraulic anchor machine braking system with two-gear speed adjustment |
| CN103130099A (en) * | 2013-03-11 | 2013-06-05 | 徐工集团工程机械股份有限公司 | Crawler crane mast lifting hydraulic control system and method |
| CN104071709A (en) * | 2014-07-18 | 2014-10-01 | 徐州重型机械有限公司 | Fixed fly jib stepless amplitude-variation control system for crane and crane |
| JP2017002478A (en) * | 2015-06-04 | 2017-01-05 | 日立建機株式会社 | Pile driver |
| CN107934807A (en) * | 2017-12-28 | 2018-04-20 | 徐工集团工程机械有限公司 | The variable amplitude hydraulic system and lorry-mounted crane of crane |
| CN111350703A (en) * | 2020-03-11 | 2020-06-30 | 长沙中联恒通机械有限公司 | Control valve group, sliding system, erecting device and control method |
| CN111894918A (en) * | 2020-08-21 | 2020-11-06 | 中铁工程机械研究设计院有限公司 | Oil cylinder lifting system and oil cylinder lifting control method |
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| Publication number | Publication date |
|---|---|
| CN112460078B (en) | 2024-01-23 |
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