CN110905870B - Load sensitive hydraulic system - Google Patents
Load sensitive hydraulic system Download PDFInfo
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- CN110905870B CN110905870B CN201911246383.XA CN201911246383A CN110905870B CN 110905870 B CN110905870 B CN 110905870B CN 201911246383 A CN201911246383 A CN 201911246383A CN 110905870 B CN110905870 B CN 110905870B
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- load
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- control valve
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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
- 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
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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
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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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)
- Operation Control Of Excavators (AREA)
Abstract
The invention relates to a load-sensitive hydraulic system, which aims to solve the problem that the existing load-sensitive hydraulic system has poor adaptability on a machine due to the change of working conditions; the system comprises a two-position three-way electromagnetic valve and a fixed differential pressure reducing valve, wherein a first oil port of the two-position three-way electromagnetic valve is connected with a load feedback port of a load sensitive control valve, a third oil port is connected with a control port of a flow control valve on a load sensitive variable pump, a second oil port is connected with the control port of the flow control valve on the load sensitive variable pump through the fixed differential pressure reducing valve, and the first oil port of the two-position three-way electromagnetic valve is selectively communicated with the second oil port or the third oil port. The load feedback pressure transmitted by the load sensitive control valve is controlled, so that the opening degree of the valve port of the load sensitive control valve is the same in different working conditions, but the flow output by the load sensitive variable pump is different, a hydraulic system is more suitable for being matched with the corresponding working conditions, and the adaptability of the machine in different working conditions is improved.
Description
Technical Field
The present invention relates to a hydraulic system, and more particularly, to a load sensitive hydraulic system.
Background
The load-sensitive hydraulic system mainly comprises a load-sensitive variable pump 1, a load-sensitive control valve 2 and a hydraulic execution element 3, wherein an outlet of the load-sensitive variable pump is connected with an inlet of the load-sensitive control valve, and a load feedback port of the load-sensitive control valve is connected with a control port of a flow control valve 11 on the load-sensitive variable pump 1.
The working principle of the load-sensitive hydraulic system is shown in figure 1, a load-sensitive variable pump outlet (P port) is connected with a load-sensitive control valve inlet (P1 port), a load feedback port (LS1 port) of the load-sensitive control valve is connected with a flow control valve control port (LS port) on the load-sensitive variable pump, and the flow output of the pump is controlled by the pressure difference between the pump port (P port) and the load feedback port (LS1 port) of the load-sensitive variable pump. When the opening of the load sensitive control valve port is fixed, the flow control valve on the load sensitive variable pump controls the flow output of the pump, when the pressure difference generated by the flow of the load sensitive control valve is the same as the pressure difference set by the flow control valve, the load sensitive variable pump outputs a constant flow, when the flow of the load sensitive control valve port is enlarged or reduced, the flow control valve enlarges or reduces the displacement of the control pump until the pressure difference between the inlet (P1 port) of the load sensitive control valve and the load feedback port (LS1 port) is equal to the pressure difference controlled by the flow control valve, namely the flow output of the pump is controlled by the pressure difference of the valve port, the system has obvious energy-saving effect and wide application.
When a machine works under different working conditions, the control characteristics of the system are the same, for example, the control characteristics of the system are the same under the working conditions of quick action and fine action of the machine, so that the working condition adaptability of the hydraulic system on the machine is poor.
Disclosure of Invention
The invention aims to solve the technical problem that the existing load-sensitive hydraulic system is poor in adaptability on a machine due to working condition changes, and provides a load-sensitive hydraulic system which is applied to the machine, is suitable for various working conditions and improves the adaptability of the hydraulic system on the machine.
The technical scheme for realizing the purpose of the invention is as follows: the utility model provides a sensitive hydraulic system of load, including the sensitive variable pump of load, the sensitive control valve of load and hydraulic actuator, the work hydraulic fluid port and the hydraulic actuator of the sensitive variable pump of load are connected, and the oil-out and the sensitive control valve oil inlet of load of the sensitive variable pump of load are connected, and its characterized in that still includes the electromagnetic control set difference relief pressure valve, the electromagnetic control set difference relief pressure valve comprises two tee solenoid valves and fixed difference relief pressure valve, the first hydraulic fluid port of two tee solenoid valves is connected with the load feedback mouth of the sensitive control valve of load, and the second hydraulic fluid port is connected with the last flow control valve control mouth of the sensitive variable pump of load through the fixed difference relief pressure valve, and the third hydraulic fluid port is connected with the last flow control valve control mouth of the sensitive variable pump of load, and the first hydraulic fluid port and second hydraulic fluid port or the third hydraulic fluid port of two tee solenoid valves switch on. Further, the fixed-differential pressure reducing valve is an electric proportional fixed-differential pressure reducing valve. In the invention, under a normal working condition, a load feedback port of a load sensitive control valve is communicated with a flow control valve control port on a load sensitive variable pump through a first oil port and a third oil port of a two-position three-way electromagnetic valve, the load sensitive control valve and the load sensitive variable pump respectively work according to the flow pressure difference control characteristic of the load sensitive valve and the flow control characteristic of the load sensitive variable pump which are well matched in type selection, so that a hydraulic system adapts to the main working condition of a machine, when the working condition of the machine changes, the two-position three-way electromagnetic valve is controlled to change the direction of the machine when fine operation needs to be realized, and the load feedback port of the load sensitive control valve is communicated with the flow control port on the load sensitive variable pump through the first oil port and the second oil port of the two-position three-way electromagnetic valve and a fixed-difference pressure reducing valve. The load feedback pressure signal output by the load feedback port of the load sensitive control valve is reduced by a set value (the set value of the fixed-differential pressure reducing valve) and then acts on the control port of the flow control valve on the load sensitive variable pump, so that the displacement of the load sensitive variable pump is reduced under the condition that the opening degree of the valve port of the load sensitive control valve is the same, and the control stability of a machine is improved. The pressure reduction value of the constant-differential pressure reduction valve can be one, the hydraulic system can adapt to two working conditions at the moment, the constant-differential pressure reduction valve can also adopt an electric proportional constant-differential pressure reduction valve, and various pressure reduction values can be realized, so that the hydraulic system can adapt to various working conditions.
Compared with the prior art, the load feedback pressure transmitted to the control port of the flow control valve on the load sensitive variable pump by the load sensitive control valve is controlled, so that the opening degree of the valve port of the load sensitive control valve is the same in different working conditions, but the flow output by the load sensitive variable pump is different, a hydraulic system is more suitable for matching with the corresponding working conditions, and the adaptability of the machine under different working conditions is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art load-sensitive hydraulic system
Fig. 2 is a schematic diagram of the load sensitive hydraulic system of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
As shown in fig. 2, the load-sensitive hydraulic system of the present invention includes a load-sensitive variable pump 1, a load-sensitive control valve 2, a hydraulic actuator 3, and an electromagnetic control constant-differential pressure-reducing valve 4, wherein a working oil port of the load-sensitive control valve 2 is connected to the hydraulic actuator 3, and the hydraulic actuator 3 is usually a hydraulic cylinder or a hydraulic motor. An oil outlet (a port P) of the load sensitive variable pump 1 is connected with an oil inlet (a port P1) of the load sensitive control valve 2, the electromagnetic control constant differential pressure reducing valve 4 is composed of a two-position three-way electromagnetic valve 41 and a constant differential pressure reducing valve 42, a first oil port of the two-position three-way electromagnetic valve 41 is connected with a load feedback port (a port LS 1) of the load sensitive control valve 2, a second oil port is connected with a control port (a port LS) of a flow control valve 11 on the load sensitive variable pump 1 through the constant differential pressure reducing valve 42, a third oil port is connected with a control port of the flow control valve on the load sensitive variable pump, and the first oil port of the two-position three-way electromagnetic valve 41 is selectively communicated with the second oil port or the third oil port.
In this embodiment, the hydraulic system may be used on a work machine, such as a hydraulic system used on an excavator as a work implement, or on a loader for a loader work implement hydraulic system or a steering system. The two-position three-way valve can be manually controlled manually, or a controller on the machine can detect the working parameters of the machine and then carry out logic judgment, and the working position of the two-position three-way valve is controlled under the condition of preset load conditions, so that the first oil port and the third oil port of the two-position three-way valve are communicated or the first oil port and the second oil port of the two-position three-way valve are communicated.
In this embodiment, under a normal working condition, the load feedback port of the load sensitive control valve is communicated with the flow control valve control port on the load sensitive variable pump through the first oil port and the third oil port of the two-position three-way electromagnetic valve, and the load sensitive control valve and the load sensitive variable pump respectively work according to the flow pressure difference control characteristic of the load sensitive valve and the flow control characteristic of the load sensitive variable pump which are well matched in model selection, so that the hydraulic system adapts to a main working condition of a machine, for example, the hydraulic system is used in a fine operation working condition of the machine.
When the working condition of the machine changes, for example, a hydraulic system is used in an excavator and used for fine operation, the two-position three-way electromagnetic valve is controlled to reverse at the moment, and a load feedback port of the load sensitive control valve is communicated with a flow control valve control port on the load sensitive variable pump through a first oil port and a second oil port of the two-position three-way electromagnetic valve and the fixed differential pressure reducing valve. The load feedback pressure signal output by the load feedback port of the load sensitive control valve is reduced by a set value (the set value of the fixed-differential pressure reducing valve) and then is applied to the control port of the flow control valve on the load sensitive variable pump, so that the flow of the load sensitive variable pump is reduced under the condition that the opening degree of the valve port of the load sensitive control valve is the same, and the control stability of a machine is improved.
In this embodiment, the pressure reduction value of the fixed-differential pressure reduction valve may be one, and the hydraulic system may be adapted to two working conditions at this time. The control signal of the two-position three-way valve can be controlled manually or controlled by a certain group of relevant parameters of the machine, such as vehicle speed, engine rotating speed and the like, and is automatically controlled after logical judgment of the controller. The constant-differential pressure reducing valve can also be an electric proportional constant-differential pressure reducing valve, different pressure reducing values are realized by outputting different current values through the controller, and therefore the hydraulic system is adaptive to various working conditions.
Compared with the prior art, the load feedback pressure transmitted to the control port of the flow control valve on the load sensitive variable pump by the load sensitive control valve is controlled, so that the opening degree of the valve port of the load sensitive control valve is the same in different working conditions, but the flow output by the load sensitive variable pump is different, a hydraulic system is more suitable for matching with the corresponding working conditions, and the adaptability of the machine under different working conditions is improved.
Claims (2)
1. The utility model provides a sensitive hydraulic system of load, includes the sensitive variable pump of load, the sensitive control valve of load and hydraulic actuator, the work hydraulic fluid port and the hydraulic actuator of the sensitive variable pump of load are connected, and the oil-out and the sensitive control valve oil inlet of the sensitive variable pump of load are connected, its characterized in that still includes the electromagnetic control standard deviation relief pressure valve, the electromagnetic control standard deviation relief pressure valve comprises two three-way solenoid valves and fixed difference relief pressure valve, the first hydraulic fluid port of two three-way solenoid valves is connected with the load feedback mouth of the sensitive control valve of load, and the third hydraulic fluid port is connected with the last flow control valve control mouth of the sensitive variable pump of load, and the second hydraulic fluid port is connected with the last flow control valve control mouth of the sensitive variable pump of load through the fixed difference relief pressure valve, and the first hydraulic fluid port and second hydraulic fluid port or third hydraulic fluid port of two three-way solenoid valves switch on one.
2. The load sensitive hydraulic system of claim 1, wherein the fixed differential relief valve is an electrically proportional fixed differential relief valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911246383.XA CN110905870B (en) | 2019-12-09 | 2019-12-09 | Load sensitive hydraulic system |
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| CN201911246383.XA CN110905870B (en) | 2019-12-09 | 2019-12-09 | Load sensitive hydraulic system |
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| CN110905870A CN110905870A (en) | 2020-03-24 |
| CN110905870B true CN110905870B (en) | 2022-01-11 |
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| CN112443521A (en) * | 2020-12-07 | 2021-03-05 | 雷沃工程机械集团有限公司 | Load sensitive system and method for reducing pipeline influence |
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Effective date of registration: 20230327 Address after: 545000 No. 6, Yangtai Road, Yanghe industrial new area, Liuzhou City, Guangxi Zhuang Autonomous Region Patentee after: Guangxi Zhongyuan Machinery Co.,Ltd. Patentee after: GUANGXI LIUGONG MACHINERY Co.,Ltd. Address before: 545006 No.1 Hexiang Road (Yanghe industrial new area), Yufeng District, Liuzhou City, Guangxi Zhuang Autonomous Region 545006 Patentee before: LIUZHOU LIUGONG HYDRAULIC COMPONENTS Co.,Ltd. Patentee before: GUANGXI LIUGONG MACHINERY Co.,Ltd. |