CN105370643A - Engineering machinery and closed type hydraulic system thereof - Google Patents
Engineering machinery and closed type hydraulic system thereof Download PDFInfo
- Publication number
- CN105370643A CN105370643A CN201510980950.XA CN201510980950A CN105370643A CN 105370643 A CN105370643 A CN 105370643A CN 201510980950 A CN201510980950 A CN 201510980950A CN 105370643 A CN105370643 A CN 105370643A
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- China
- Prior art keywords
- hydraulic system
- valve
- closed type
- described control
- type hydraulic
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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
- 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
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B2013/0412—Valve members; Fluid interconnections therefor with three positions
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40523—Flow control characterised by the type of flow control means or valve with flow dividers
- F15B2211/4053—Flow control characterised by the type of flow control means or valve with flow dividers using valves
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
Landscapes
- 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 closed type hydraulic system of engineering machinery. The closed type hydraulic system comprises a control cylinder and a reversing valve, wherein two working cavities of the control cylinder are communicated with working ports of the reversing valve respectively; when a piston of the control cylinder is in the default position, a main oil pump is controlled to stop outputting hydraulic oil; the closed type hydraulic system further comprises a control valve used for controlling on-off of the two working cavities of the control cylinder, and working ports of the control valve are communicated with the two working cavities of the control cylinder respectively. When standby check is required, the main oil pump is enabled to be in an off-working state, then the two working ports of the control valve are communicated, the two working cavities of the control cylinder are directly communicated, pressure of the two working cavities is equal all along, even though the reversing valve acts, pressure difference pushing the piston of the control cylinder to move cannot be produced, the main oil pump is always in the off-working state, an executive component can avoid false operation, and the safety of the standby check is guaranteed. The invention further discloses the engineering machinery comprising the closed type hydraulic system.
Description
Technical field
The present invention relates to Hydraulic Field, particularly relate to a kind of closed type hydraulic system of engineering machinery.In addition, the invention still further relates to a kind of engineering machinery comprising above-mentioned closed type hydraulic system.
Background technique
According to the endless form of hydraulic oil, hydraulic system can be divided into open type and enclosed two kinds, wherein the oil inlet pipe of the main oil pump of closed type hydraulic system is directly connected with the return tube of executive component, and working liquid body carries out closed circulation in the pipeline of system.Its compact structure, few with air touch opportunity, air not easily infiltrates system, therefore transmission is more steady.The speed change of executive component and commutation realize by regulating the stroking mechanism of main oil pump, avoid the hydraulic shock and energy loss that occur in open system commutation process.
Please refer to Fig. 1, Fig. 1 is the hydraulic schematic diagram of closed type hydraulic system in prior art.In closed type hydraulic system, comprise main oil pump 1.1, control cylinder 1.7 and selector valve 1.6, wherein the A mouth of main oil pump 1.1 is communicated with executive component with B mouth, the external part of control cylinder 1.7 is connected with the stroking mechanism of main oil pump 1.1, and two active chambers of control cylinder 1.7 are communicated with two actuator ports of selector valve 1.6 respectively.When needing the working state controlling main oil pump 1.1, control the working position residing for selector valve 1.6, and then hydraulic control oil enters the active chamber of control cylinder 1.7, thus the external part of drived control cylinder 1.7 controls the stroking mechanism of main oil pump 1.1, and then change output quantity and the flow direction of main oil pump 1.1 hydraulic oil, realize the accurate control to executive component.When the external part of control cylinder 1.7 moves to predeterminated position, make stroking mechanism be in particular state, and then make main oil pump 1.1 not output hydraulic pressure oil, be namely in off working state.
At needs to equipment until machine check time, namely equipment is in the state of or not shutting down flame-outly, control control cylinder 1.7 external part is moved to predeterminated position, main oil pump 1.1 is made to be in off working state, and make selector valve 1.6 be in meta state, namely hydraulic oil can not enter the active chamber of control cylinder 1.7, ensure that control cylinder 1.7 external part no longer moves, stroking mechanism is no longer moved, and then make main oil pump 1.1 be in off working state always, carry out the inspection to equipment again, to ensure the safety in checking process.But, because misoperation or other reasons cause selector valve 1.6 action, make hydraulic oil enter the active chamber of control cylinder 1.7, and then make main oil pump 1.1 in running order, cause executive component to occur misoperation phenomenon, occur security incident.
Therefore, a kind of closed type hydraulic system that can prevent main oil pump when machine check from entering working state how is provided to be the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of closed type hydraulic system of engineering machinery, can prevent main oil pump when machine check from entering working state.Another object of the present invention is to provide a kind of engineering machinery comprising above-mentioned closed type hydraulic system, can prevent main oil pump when machine check from entering working state, improves Security.
For solving the problems of the technologies described above, the invention provides a kind of closed type hydraulic system of engineering machinery, comprise the control cylinder for controlling main oil pump working state and the selector valve for controlling the commutation of described control cylinder, two active chambers of described control cylinder are communicated with the actuator port of described selector valve respectively, the piston of described control cylinder controls described main oil pump and stops output hydraulic pressure oil when being in predeterminated position, also comprise the control valve for two the active chamber break-makes controlling described control cylinder, the actuator port of described control valve is communicated with two active chambers of described control cylinder respectively.
Preferably, described control valve is specially two-position two-way solenoid valve.
Preferably, described two-position two-way solenoid valve is specially bi-bit bi-pass Direct-action electromagnetic valve open in usual.
Preferably, described control valve is specially stop valve.
Preferably, an actuator port of described control valve is communicated with the oil circuit between an actuator port of described selector valve and an active chamber of described control cylinder, and another actuator port of described control valve is communicated with the oil circuit between another actuator port of described selector valve and another active chamber of described control cylinder.
Preferably, an actuator port of described control valve is communicated with the filler opening of described selector valve, and another actuator port of described control valve is communicated with the return opening of described selector valve.
Preferably, the cylinder body two ends of described control cylinder are provided with two control ports, two described control ports are communicated with two active chambers of described control cylinder respectively, an actuator port of described control valve is communicated with a described control port, and another actuator port of described control valve is communicated with control port described in another.
The present invention also provides a kind of engineering machinery, comprises closed type hydraulic system, and described closed type hydraulic system is specially the closed type hydraulic system described in above-mentioned any one.
Closed type hydraulic system provided by the invention, comprise main oil pump, control cylinder and selector valve, the piston of control cylinder controls main oil pump and stops output hydraulic pressure oil when being in predeterminated position, also comprise control valve, two actuator ports of control valve are communicated with two active chambers of control cylinder respectively.During normal work, control valve two actuator ports disconnect, and two active chambers of control cylinder can not directly be communicated with, and closed type hydraulic system normally works.When needs are until machine check, after making main oil pump be in off working state, control valve two actuator ports are communicated with, two of control cylinder active chambers are directly communicated with, and then make the pressure of two active chambers equal all the time, even if action appears in selector valve, also pressure difference can not be produced and the piston promoting control cylinder moves, make main oil pump be in off working state, executive component there will not be misoperation phenomenon always, ensures the Security when machine check.
Engineering machinery provided by the invention, comprises above-mentioned closed type hydraulic system, and because above-mentioned closed type hydraulic system has above-mentioned technique effect, above-mentioned engineering machinery also should have identical technique effect, introduces no longer in detail at this.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of closed type hydraulic system in prior art;
Fig. 2 is the hydraulic schematic diagram of a kind of embodiment of closed type hydraulic system provided by the present invention;
Fig. 3 is the hydraulic schematic diagram of the another kind of embodiment of closed type hydraulic system provided by the present invention.
Embodiment
Core of the present invention is to provide a kind of closed type hydraulic system of engineering machinery, can prevent main oil pump when machine check from entering working state.Another core of the present invention is to provide a kind of engineering machinery comprising above-mentioned closed type hydraulic system, can prevent main oil pump when machine check from entering working state, improves Security.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 2, Fig. 2 is the hydraulic schematic diagram of a kind of embodiment of closed type hydraulic system provided by the present invention.
The closed type hydraulic system that the specific embodiment of the invention provides, comprises main oil pump 1.1, control cylinder 1.7 and selector valve 1.6.Particularly; main oil pump 1.1 can be inclined disc type variable displacement pump; control cylinder 1.7 is the inner two-way cylinder being provided with elastic recovery part; selector valve 1.6 is 3-position 4-way electro-hydraulic proportion reversing valve; the particular type of the said equipment is a kind of embodiment; as long as have identical function, the equipment of other types also can realize corresponding function, all within protection scope of the present invention.
During work, hydraulic oil enters the left chamber of two-way cylinder or right chamber by the left position of 3-position 4-way electro-hydraulic proportion reversing valve or right position, piston rod moves, and then adjust the angle of the swash plate of inclined disc type variable displacement pump be connected with piston rod, thus control direction and the flow of inclined disc type variable displacement pump output hydraulic pressure oil.And be communicated with executive component by A mouth with B mouth, realize the control to executive component.When piston moves to predeterminated position, adjustment swash plate is in special angle, make inclined disc type variable displacement pump not output hydraulic pressure oil, be in off working state, make 3-position 4-way electro-hydraulic proportion reversing valve be in meta simultaneously, hydraulic oil can not enter two-way cylinder, and then executive component also can not move, and keeps holding state.
And in the closed type hydraulic system that the specific embodiment of the invention provides, also comprising control valve 2, two actuator ports of control valve 2 are communicated with two active chambers of control cylinder 1.7 respectively, and control valve 2 can control the break-make of two actuator ports.During normal work, control valve 2 two actuator ports disconnect, and two active chambers of control cylinder 1.7 can not directly be communicated with, and closed type hydraulic system normally works.When needs are until machine check, after making main oil pump 1.1 be in off working state, control valve 1.6 two actuator ports are communicated with, two of control cylinder 1.7 active chambers are directly communicated with, and then make the pressure of two active chambers equal all the time, even if action appears in selector valve 1.6, also pressure difference can not be produced and the piston promoting control cylinder 1.7 moves, make main oil pump 1.1 be in off working state, executive component there will not be misoperation phenomenon always, ensures the Security when machine check.
Particularly, control valve 2 can be two-position two-way solenoid valve, controls break-make by electrical signal, and precise control and response are rapidly.In order to improve Security further, bi-bit bi-pass Direct-action electromagnetic valve open in usual can be specially, be in obtain dotted state during normal work always, now bi-bit bi-pass Direct-action electromagnetic valve open in usual is in off state, and need when machine check, bi-bit bi-pass Direct-action electromagnetic valve dead electricity open in usual, is in connected state, and guarantee will make bi-bit bi-pass Direct-action electromagnetic valve open in usual disconnect because of unexpected dead electricity.Also normally closed solenoid valve can be adopted, all within protection scope of the present invention.
Also can adopt the control valve 2 of other types, as long as have the control valve 2 controlling on-off function, all within protection scope of the present invention, please refer to Fig. 3, Fig. 3 is the hydraulic schematic diagram of the another kind of embodiment of closed type hydraulic system provided by the present invention.Wherein control valve 2 is specially stop valve, by Non-follow control, can not produce dangerous because of Equipment.
In the closed type hydraulic system that above-mentioned each embodiment provides, control valve 2 has multiple Placement, can make the oil circuit between an actuator port of an actuator port connection selector valve 1.6 of control valve 2 and an active chamber of control cylinder 1.7, another actuator port of control valve 2 is communicated with the oil circuit between another actuator port of selector valve 1.6 and another active chamber of control cylinder 1.7.In this way, ensure no matter which kind of working position selector valve 1.6 is in, two active chambers of control cylinder 1.7 are directly communicated with always, pressure keeps equal, structure is more simple, also other Placements can be adopted, two actuator ports as control valve 2 are communicated with filler opening and the oil outlet of selector valve 1.6 respectively, when control valve 2 is communicated with, hydraulic oil can not enter selector valve 1.6, namely the actuator port of control valve 2 and being communicated with of control cylinder 1.7 is realized by the mode of selector valve 1.6 indirect communication, also two active chamber pressure balances when until machine check of control cylinder 1.7 can be ensured, piston does not move, all within protection scope of the present invention.
Also the mode be directly communicated with can be adopted, the cylinder body two ends of control cylinder 1.7 are provided with two control ports, two control ports are communicated with two active chambers of control cylinder 1.7 respectively, an actuator port of control valve 2 is communicated with a control port, and another actuator port of control valve 2 is communicated with another control port.Two active chamber pressure balances when until machine check of control cylinder 1.7 can be ensured equally, also within protection scope of the present invention.
Simultaneously, the closed type hydraulic system that the specific embodiment of the invention provides also comprises the first relief valve 1.2.1 and the second relief valve 1.2.2, and be communicated with pressure shut-off valve 1.3, and pressure shut-off valve 1.3 is communicated with selector valve 1.6, in order to realize Stress control while control cylinder 1.7 conveying liquid force feed, also be provided with slippage pump 1.5 and slippage pump relief valve 1.4, realize system repairing.
Except above-mentioned closed type hydraulic system, the specific embodiment of the present invention also provides a kind of engineering machinery comprising above-mentioned closed type hydraulic system, and the structure of other each several parts of this project machinery please refer to prior art, repeats no more herein.
Above engineering machinery provided by the present invention and closed type hydraulic system thereof are described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (8)
1. the closed type hydraulic system of an engineering machinery, comprise control cylinder (1.7) for controlling main oil pump (1.1) working state and for controlling the selector valve (1.6) that described control cylinder (1.7) commutates, two active chambers of described control cylinder (1.7) are communicated with the actuator port of described selector valve (1.6) respectively, the piston of described control cylinder (1.7) controls described main oil pump (1.1) and stops output hydraulic pressure oil when being in predeterminated position, it is characterized in that, also comprise the control valve (2) of two active chamber break-makes for controlling described control cylinder (1.7), the actuator port of described control valve (2) is communicated with two active chambers of described control cylinder (1.7) respectively.
2. closed type hydraulic system according to claim 1, is characterized in that, described control valve (2) is specially two-position two-way solenoid valve.
3. closed type hydraulic system according to claim 2, is characterized in that, described two-position two-way solenoid valve is specially bi-bit bi-pass Direct-action electromagnetic valve open in usual.
4. closed type hydraulic system according to claim 1, is characterized in that, described control valve (2) is specially stop valve.
5. the closed type hydraulic system according to Claims 1-4 any one, it is characterized in that, an actuator port of described control valve (2) is communicated with the oil circuit between an actuator port of described selector valve (1.6) and an active chamber of described control cylinder (1.7), and another actuator port of described control valve (2) is communicated with the oil circuit between another actuator port of described selector valve (1.6) and another active chamber of described control cylinder (1.7).
6. the closed type hydraulic system according to Claims 1-4 any one, it is characterized in that, an actuator port of described control valve (2) is communicated with the filler opening of described selector valve (1.6), and another actuator port of described control valve (2) is communicated with the return opening of described selector valve (1.6).
7. the closed type hydraulic system according to Claims 1-4 any one, it is characterized in that, the cylinder body two ends of described control cylinder (1.7) are provided with two control ports, two described control ports are communicated with two active chambers of described control cylinder (1.7) respectively, an actuator port of described control valve (2) is communicated with a described control port, and another actuator port of described control valve (2) is communicated with control port described in another.
8. an engineering machinery, comprises closed type hydraulic system, it is characterized in that, described closed type hydraulic system is specially the closed type hydraulic system described in claim 1 to 7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510980950.XA CN105370643A (en) | 2015-12-23 | 2015-12-23 | Engineering machinery and closed type hydraulic system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510980950.XA CN105370643A (en) | 2015-12-23 | 2015-12-23 | Engineering machinery and closed type hydraulic system thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105370643A true CN105370643A (en) | 2016-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510980950.XA Pending CN105370643A (en) | 2015-12-23 | 2015-12-23 | Engineering machinery and closed type hydraulic system thereof |
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| Country | Link |
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| CN (1) | CN105370643A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027870A (en) * | 2021-03-17 | 2021-06-25 | 四川百纳科技有限责任公司 | Independent heat dissipation system of all-terrain armored vehicle and control method thereof |
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Application publication date: 20160302 |