CN112065788B - Method for solving misoperation of valve core of oil-filling valve under low-load working condition of closed hydraulic system - Google Patents
Method for solving misoperation of valve core of oil-filling valve under low-load working condition of closed hydraulic system Download PDFInfo
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- CN112065788B CN112065788B CN202010952326.XA CN202010952326A CN112065788B CN 112065788 B CN112065788 B CN 112065788B CN 202010952326 A CN202010952326 A CN 202010952326A CN 112065788 B CN112065788 B CN 112065788B
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/25—Pressure control functions
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8613—Control during or prevention of abnormal conditions the abnormal condition being oscillations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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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)
Abstract
The invention discloses a method for solving misoperation of a valve core of an oil valve under a low-load working condition of a closed hydraulic system, and belongs to the technical field of hydraulic systems. The hydraulic pump of the closed hydraulic system is communicated with the hydraulic actuator through the oil way A and the oil way B, the oil way A and the oil way B are connected with the oil-adding valve through the oil pipe, the resistance of the oil flow in the oil way A and/or the oil way B is increased, the pressure difference between the oil way A and the oil way B on two sides of the oil-adding valve is increased, the hydraulic pressure acting on the valve core of the oil-adding valve is larger than the spring force acting on the valve core of the spring, so that the valve core of the oil-adding valve can act as required, the problems of pressure fluctuation and uncontrollable oil temperature of the closed hydraulic system under a low-load working condition are solved, and the continuous stable operation of the closed hydraulic system is ensured.
Description
Technical Field
The invention belongs to the technical field of hydraulic systems, and particularly relates to a method for solving misoperation of a valve core of an oil valve under a low-load working condition of a closed hydraulic system.
Background
The closed hydraulic system has the characteristics of compact structure, high integration degree, small reversing impact and stable operation, and is widely applied to occasions with requirements on places and severe working conditions, such as industries of chemical industry, steel, engineering vehicles, ships and the like. The oil outlet and the oil inlet of the hydraulic pump in the closed hydraulic system are respectively and directly connected with the oil inlet and the oil return port of the hydraulic motor, the hydraulic pump is not communicated with the outside, the oil in the closed hydraulic system is self-circulated, the contact opportunity with air is less, pollutants and water vapor are not easy to mix, and the oil tank can be designed smaller.
As shown in fig. 1, a general closed hydraulic system includes a prime mover, a main hydraulic pump, a variable control mechanism, an oil compensating pump, an oil compensating valve, a pressure meter, etc., and under a low load condition, when the difference Δp of the pressures between two working oil paths of the main hydraulic pressure is less than or equal to 1MPa, the hydraulic pressure acting on the spool of the oil compensating valve is insufficient to completely overcome the spring force acting on the spool by the spring, so that the spool generates malfunction, including that the spool cannot be maintained in the left position or the right position, or the spool is in the middle position and is not operated, or the spool is not operated reliably, or the spool is operated uncontrollably, resulting in the pressure fluctuation and the oil temperature of the system, which affects the continuous stable operation.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problem that in the prior art, the closed hydraulic system has misoperation of a valve core of an oil valve under a low-load working condition, so that the pressure fluctuation and the oil temperature of the system are uncontrollable, and the continuous stable operation is influenced.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
according to the method for solving the misoperation of the valve core of the oil-adding valve under the low-load working condition of the closed hydraulic system, the hydraulic pump of the closed hydraulic system is communicated with the hydraulic actuator through the oil way A and the oil way B, the oil-adding valve is connected between the oil way A and the oil way B through the oil pipe, the resistance of the oil liquid flowing in the oil way A and/or the oil way B is increased, and the pressure difference between the oil way A and the oil way B at the two sides of the oil-adding valve is increased.
Preferably, the means for increasing the resistance of the oil flow in the oil passage a and/or the oil passage B is: and a throttle valve and/or a one-way sequence valve are arranged on the oil way A and/or the oil way B.
Preferably, when the oil flows from the oil passage A to the oil passage B, the resistance of the oil flow in the oil passage A is increased; and/or increasing the resistance of the oil flow in the oil passage B when the oil flows from the oil passage B to the oil passage A.
Preferably, the closed hydraulic system comprises a hydraulic pump, a hydraulic actuator and an oil tank, wherein one end of the hydraulic pump is communicated with one end of the hydraulic actuator through an oil way A, and one end of the hydraulic pump is communicated with one end of the hydraulic actuator through an oil way B; the oil way A and the oil way B are respectively connected with the oil tank through oil supplementing ways, and oil supplementing pumps are arranged on the oil supplementing ways; an oil-adding valve is connected between the oil way A and the oil way B through an oil pipe, and the oil-adding valve is communicated to an oil tank; and the A oil way and/or the B oil way are/is provided with a throttle valve and/or a one-way sequence valve.
Preferably, when oil flows from the oil line A to the oil line B, a throttle valve and/or a one-way sequence valve are arranged on the oil line A; and/or oil flows from the oil way B to the oil way A, and a throttle valve and/or a one-way sequence valve are arranged on the oil way B.
Preferably, the throttle valve is a hydraulic throttle valve; and/or the one-way throttle valve is a one-way hydraulic throttle valve.
Preferably, the throttle valve and/or the one-way sequence valve are/is mounted or plate-mounted by means of a pipeline.
Preferably, the oil supplementing path is provided with an A oil supplementing valve and a B oil supplementing valve, and the oil supplementing path between the A oil supplementing valve and the B oil supplementing valve is communicated with the oil tank through an oil supplementing pump; the oil-way oil-compensating valve A and the oil-way oil-compensating valve B are two reverse series check valves.
Preferably, the oil-filled valve is connected to the oil tank via an oil-filled valve.
Preferably, the oil circuit A and/or the oil circuit B and/or the oil supplementing circuit are/is provided with a pressure gauge and/or a pressure transmitter and/or a pressure switch.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
according to the method for solving the misoperation of the valve core of the oil-adding valve under the low-load working condition of the closed hydraulic system, the hydraulic pump of the closed hydraulic system is communicated with the hydraulic actuator through the oil way A and the oil way B, the oil-adding valve is connected between the oil way A and the oil way B through the oil pipe, the resistance of the oil flow in the oil way A and/or the oil way B is increased, the pressure difference between the oil way A and the oil way B on two sides of the oil-adding valve is increased, the hydraulic force acting on the valve core of the oil-adding valve is larger than the spring force acting on the valve core of the spring, so that the valve core of the oil-adding valve can act according to requirements, and the problems of pressure fluctuation and uncontrollable oil temperature of the closed hydraulic system under the low-load working condition are solved, and the continuous stable operation of the closed hydraulic system is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a closed hydraulic system of the prior art;
FIG. 2 is a schematic diagram of a closed hydraulic system with throttle valves in the A, B oil paths;
FIG. 3 is a schematic view of a closed hydraulic system with one-way throttle valves in A, B oil paths;
fig. 4 is a schematic diagram showing a part of a closed hydraulic system used in the method of the present invention, in which a one-way sequence valve is disposed in each oil path A, B.
Reference numerals in the schematic drawings illustrate:
1. an oil tank; 2. b, an oil way; 3. a hydraulic motor; 4. a make-up pump; 5. an oil circuit pressure supplementing instrument; 6. an oil supplementing way; 7. b, an oil way pressure instrument; 8. b an oil circuit oil supplementing valve; 9. a main hydraulic pump; 10. a prime mover; 11. a variable control structure; 12. an oil way pressure instrument; 13. an oil circuit oil supplementing valve; 14. an oil-adding valve; 15. a more oil pressure valve; 16. a cooler; 17. an oil way A; 18. an oil filter; 19. an oil way throttle valve; 20. b an oil way throttle valve; 21. a oil way one-way throttle valve; 22. b oil way one-way throttle valve; 23. a, an oil way one-way sequence valve; 24. and B, an oil way one-way sequence valve.
Detailed Description
The following detailed description and example embodiments of the invention may be better understood when read in conjunction with the accompanying drawings, in which elements and features of the invention are identified by reference numerals.
According to the method for solving the misoperation of the valve core of the oil-adding valve under the low-load working condition of the closed hydraulic system, the hydraulic pump (9) of the closed hydraulic system is communicated with the hydraulic actuator (3) through the oil-adding valve (14) connected between the oil-adding valve (17) and the oil-adding valve (2) through oil pipes, and the oil flow resistance in the oil-adding valve (17) and/or the oil-adding valve (2) is increased, and the pressure difference between the oil-adding valve (14) and the oil-adding valve (2) at two sides of the oil-adding valve (17) and/or the oil flow resistance in the oil-adding valve (2) is increased in the embodiment: a throttle valve and/or a one-way sequence valve are arranged on the oil way A (17) and/or the oil way B (2). When the oil flows from the oil way A (17) to the oil way B (2), the resistance of the oil way A (17) to the oil flow is increased; and/or increasing the resistance of the oil flow in the oil passage B (2) when the oil flows from the oil passage B (2) to the oil passage A (17). When oil flows from the oil way A (17) to the oil way B (2), a throttle valve and/or a one-way sequence valve are arranged on the oil way A (17); and/or oil flows from the oil way B (2) to the oil way A (17), and a throttle valve and/or a one-way sequence valve are arranged on the oil way B (2).
As shown in fig. 1, the closed hydraulic system employed in the present invention includes: the hydraulic system comprises an oil tank 1, a B oil circuit 2, a hydraulic motor 3, an oil supplementing pump 4, an oil supplementing circuit pressure instrument 5, an oil supplementing circuit 6, a B oil circuit pressure instrument 7, a B oil circuit oil supplementing valve 8, a main hydraulic pump 9, a prime motor 10, a variable control structure 11, an A oil circuit pressure instrument 12, an A oil circuit oil supplementing valve 13, an oil adding valve 14, an oil adding pressure valve 15, a cooler 16, an A oil circuit 17 and an oil filter 18. The prime motor is generally an electric motor, the oil supplementing pump 4 and the main hydraulic pump 9 are driven through a coupling, the oil supplementing pump 4 absorbs oil from the oil tank 1, and oil is conveyed to a low pressure side oil path of the main hydraulic pump 9 through an oil supplementing valve. When oil flows from the oil line A17 to the oil line B2 through the hydraulic motor 3, the oil line A17 is an oil outlet line of the main hydraulic pump 9, the oil line B2 is an oil inlet line of the main hydraulic pump 9, at the moment, the pressure of the oil line A17 is higher than that of the oil line B2, and the output oil of the oil supplementing pump 4 is output to the oil line B2 through the oil supplementing valve 8 of the oil line B2; conversely, when the flow direction of the oil is changed, the output oil of the oil supplementing pump 4 is output to the oil line A17 through the oil supplementing valve A17, the oil output by the oil supplementing pump 4 flows to the oil pressure valve 15 after passing through the oil pressure valve 14 except the leakage in the supplementing system, and returns to the oil tank through the cooler 16 and the oil filter 18; the oil-adding valve 14 in this embodiment is a hydraulic reversing valve. Under the low load working condition, the load of the hydraulic motor 3 is small, so that the working pressure difference of the hydraulic motor 3 is small, the pressure difference of the oil way 17A and the oil way B is small and is generally less than or equal to 1MPa, as can be seen from the schematic diagram of the hydraulic system in fig. 2, the oil valve 14 is in an initial state, the valve core is acted by spring force at two ends and is in a middle position, the pressure of the oil way 17A acts on the left cavity of the valve core, the pressure of the oil way 2B acts on the right cavity of the valve core, the reversing of the valve core is controlled by the pressure difference delta P of the oil way 17A and the oil way 2B, when the hydraulic pressure of the delta P acts on the valve core is larger than the spring force acting on the valve core, the valve core is reversed to the left position or the right position and is kept, and when the hydraulic pressure of the delta P acts on the valve core is not larger than the spring force acting on the valve core, the valve core can generate misoperation, the misoperation of the valve core can not be kept in the left position or the middle position is not acted, or the operation of the valve core is not reliable, or the operation of the valve core is not controlled, the pressure of the oil way 6 is influenced, the pressure of the oil way 17 and the pressure of the oil way 2B is stably fluctuated, and the stable operation is influenced.
The application method of the closed hydraulic system comprises the steps of adding a throttle valve 19 to an oil way A17 and a throttle valve 20 to an oil way B of the closed hydraulic system, or adding a one-way throttle valve 21 to the oil way A17 and a one-way throttle valve 22 to the oil way B, or adding a one-way sequence valve 23 to the oil way A17 and a one-way sequence valve 24 to the oil way B; or a throttle valve 19 is added to the A oil way 17, or a one-way throttle valve 21 is added to the A oil way 17, or a one-way sequence valve 23 is added to the A oil way 17; or a throttle valve 20 is added to the B oil way 2 of the closed hydraulic system, or a one-way throttle valve 22 is added to the B oil way 2, or a one-way sequence valve 24 is added to the B oil way 2.
The closed hydraulic system is under a low-load working condition: if the oil flows from the oil line a 17 to the oil line B2 via the hydraulic motor 3 only during the operation of the system, the throttle valve 19, the one-way throttle valve 21, or the one-way sequence valve 23 may be added to the oil line a 17 only.
If the oil flows from the B oil path 2 to the a oil path 17 through the hydraulic motor 3 only when the system is in operation, the throttle valve 20, the one-way throttle valve 22 or the one-way sequence valve 24 can be added to the B oil path 2 only.
If the oil liquid has two working conditions of flowing from the oil line A17 to the oil line B2 through the hydraulic motor 3 and flowing from the oil line B2 to the oil line A17 through the hydraulic motor 3 during the working of the system, a throttle valve 19 can be added to the oil line A17 alone or a throttle valve 20 can be added to the oil line B2 alone; or simultaneously adding a throttle valve 19 to the A oil path 17 and a throttle valve 20 to the B oil path 2 (as shown in FIG. 2); or simultaneously, a one-way throttle valve 21 is added to the oil way A17, and a one-way throttle valve 22 is added to the oil way B2 (as shown in figure 3); or simultaneously, a one-way sequence valve 23 is added to the oil line A17, and a one-way sequence valve 24 is added to the oil line B2 (as shown in figure 4). The differential delta P of the pressure between the A oil way 17 and the B oil way 2 of the main hydraulic pump 9 can be increased by adding a throttle valve or a one-way sequence valve, so that the hydraulic pressure acting on the valve core of the oil-filling valve 14 by delta P is larger than the spring force acting on the valve core by a spring, thereby ensuring that the valve core of the oil-filling valve 14 can act as required and avoiding misoperation. The throttle valve or the one-way throttle valve can change the pressure loss flowing through the throttle valve by changing the size of the section of the flow passage or the length of the flow passage; the throttle valve or the one-way throttle valve is a hydraulic throttle valve or a one-way hydraulic throttle valve or an element capable of changing the size of the section of the flow passage or the length of the flow passage; the throttle valve or the one-way throttle valve can be manually adjusted or not manually adjusted; the throttle valve or the one-way throttle valve adopts a pipeline installation form or a plate installation form; and the specifications of the throttle valve or the one-way throttle valve are matched and selected according to the flow of the closed hydraulic system. The one-way sequence valve adopts a leakage mode of leakage, the external oil leakage is directly returned to the oil tank, the sequence valve adopts a pipeline installation mode or a plate installation mode, and the pressure set value of the sequence valve can be manually adjusted; the specification of the sequence valve can be matched and selected according to the flow of the closed hydraulic system. The plate type mounting valve is selected and used, a plate type mounting special valve block is used, and the plate type mounting valve is mounted on the valve block.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will be understood that various modifications and changes may be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the invention described herein. Furthermore, the background art is intended to illustrate the status and meaning of the development of the technology and is not intended to limit the invention or the application and field of application of the invention.
Claims (6)
1. A method for solving misoperation of a valve core of an oil-adding valve under a low-load working condition of a closed hydraulic system is characterized in that a hydraulic pump (9) of the closed hydraulic system is communicated with a hydraulic actuator (3) through an oil line A (17) and an oil line B (2), the oil-adding valve (14) is connected between the oil line A (17) and the oil line B (2) through oil pipes, resistance of oil flowing in the oil line A (17) and/or the oil line B (2) is increased, and pressure difference between the oil line A (17) and the oil line B (2) at two sides of the oil-adding valve (14) is increased;
the mode for increasing the resistance of the oil flow in the oil way A (17) and/or the oil way B (2) is as follows: a throttle valve and/or a one-way sequence valve are arranged on the oil way A (17) and/or the oil way B (2); the throttle valve is a hydraulic throttle valve;
the closed hydraulic system comprises a hydraulic pump (9), a hydraulic actuator (3) and an oil tank (1), wherein one end of the hydraulic pump (9) is communicated with one end of the hydraulic actuator (3) through an A oil way (17), and one end of the hydraulic pump (9) is communicated with one end of the hydraulic actuator (3) through a B oil way (2); the oil way A (17) and the oil way B (2) are respectively connected with the oil tank (1) through an oil supplementing way (6), and an oil supplementing pump (4) is arranged on the oil supplementing way (6); the oil-adding valve (14) is communicated with the oil tank (1);
the A oil way (17) and/or the B oil way (2) and/or the oil supplementing way (6) are provided with a pressure gauge and/or a pressure transmitter and/or a pressure switch.
2. The method for solving the misoperation of the valve core of the oil valve under the low-load working condition of the closed hydraulic system according to claim 1 is characterized in that when oil flows from an oil way A (17) to an oil way B (2), the resistance of the oil flowing in the oil way A (17) is increased; and/or increasing the resistance of the oil flow in the oil passage B (2) when the oil flows from the oil passage B (2) to the oil passage A (17).
3. The method for solving the problem of misoperation of the valve core of the oil valve under the low-load working condition of the closed hydraulic system according to claim 1 is characterized in that when oil flows from an oil way A (17) to an oil way B (2), a throttle valve and/or a one-way sequence valve are arranged on the oil way A (17);
and/or oil flows from the oil way B (2) to the oil way A (17), and a throttle valve and/or a one-way sequence valve are arranged on the oil way B (2).
4. The method for solving the problem of misoperation of the valve core of the oil-filling valve under the low-load working condition of the closed hydraulic system according to claim 1 is characterized in that the throttle valve and/or the one-way sequence valve are/is installed or plate-type through a pipeline.
5. The method for solving the problem of misoperation of the valve core of the oil valve under the low-load working condition of the closed hydraulic system according to claim 1 is characterized in that an A oil circuit oil supplementing valve (13) and a B oil circuit oil supplementing valve (8) are arranged on an oil supplementing circuit (6), and the oil supplementing circuit (6) between the A oil circuit oil supplementing valve (13) and the B oil circuit oil supplementing valve (8) is communicated with an oil tank (1) through an oil supplementing pump (4); the oil-way oil-compensating valve A (13) and the oil-way oil-compensating valve B (8) are two reverse series check valves.
6. The method for solving the problem of misoperation of a valve core of a more oil valve under the low-load working condition of a closed hydraulic system according to claim 1 is characterized in that the more oil valve (14) is communicated to the oil tank (1) through the more oil pressure valve (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010952326.XA CN112065788B (en) | 2020-09-11 | 2020-09-11 | Method for solving misoperation of valve core of oil-filling valve under low-load working condition of closed hydraulic system |
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| CN202010952326.XA CN112065788B (en) | 2020-09-11 | 2020-09-11 | Method for solving misoperation of valve core of oil-filling valve under low-load working condition of closed hydraulic system |
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| CN113719484A (en) * | 2021-09-13 | 2021-11-30 | 烟台杰瑞石油装备技术有限公司 | Full-hydraulic automatic control system, pressure setting method thereof and rope saw |
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| CN100595440C (en) * | 2007-12-18 | 2010-03-24 | 浙江大学 | Variable frequency pump-control-motor closed circuit based on energy regulation |
| CN201461601U (en) * | 2009-08-24 | 2010-05-12 | 长安大学 | Electrical control hydraulic unidirectional constant speed device |
| CN201747703U (en) * | 2010-05-25 | 2011-02-16 | 长沙中联重工科技发展股份有限公司 | Sealed hydraulic system |
| CN102996539B (en) * | 2012-12-26 | 2015-07-15 | 中联重科股份有限公司 | Single-pump multi-motor unidirectional rotating closed type hydraulic system and engineering machinery comprising same |
| CN107701524B (en) * | 2017-11-10 | 2019-01-18 | 浙江大学 | A kind of energy feedback system of TBM hybrid-driven cutterhead |
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