CN114321108A - Electro-hydraulic compound control system and method and working machine - Google Patents
Electro-hydraulic compound control system and method and working machine Download PDFInfo
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- CN114321108A CN114321108A CN202111643719.3A CN202111643719A CN114321108A CN 114321108 A CN114321108 A CN 114321108A CN 202111643719 A CN202111643719 A CN 202111643719A CN 114321108 A CN114321108 A CN 114321108A
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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
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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
- F15B21/08—Servomotor systems incorporating electrically operated control means
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Abstract
The invention relates to the technical field of electro-hydraulic compound control, and provides an electro-hydraulic compound control system, an electro-hydraulic compound control method and an operation machine, wherein the electro-hydraulic compound control system comprises a controller, a hydraulic oil output unit, an action execution valve unit and an action instruction unit, wherein the input end of the controller is electrically connected with the hydraulic oil output unit, and the output end of the controller is electrically connected with the action execution valve unit; the hydraulic oil output unit is connected with the action execution valve unit and used for conveying hydraulic oil to the action execution valve unit; the action instruction unit is connected with the action execution valve unit and used for sending action instructions to the action execution valve unit. According to the invention, the controller is used for acquiring the rotating speed value signal of the hydraulic oil output unit, correspondingly converting the rotating speed value signal into the current value signal, and then sending the current value signal to the action execution valve unit, so that the adjustment of the input current of the action execution valve is realized, the adjustment of the opening degree of the control valve is further realized, the saturation state of the action execution valve unit is ensured, the response speed is high, and the flow distribution control and adjustment accuracy is high.
Description
Technical Field
The invention relates to the technical field of electro-hydraulic compound control, in particular to an electro-hydraulic compound control system, an electro-hydraulic compound control method and an operation machine.
Background
At present, most automobile cranes below 50T all adopt hydraulic control type hydraulic systems, namely, a control handle is a hydraulic handle.
The hydraulic control system has the advantages that the response speed is high, but the control mode is single, the requirements of different customers and different working conditions cannot be met, particularly, the adding and withdrawing impact of the second action is large during the composite action, and the flow distribution accuracy rate is not high; the electric control system (the control handle is an electric control handle) can perform multi-mode control and flow distribution regulation control, but has slow response speed and higher cost compared with a hydraulic control system. Meanwhile, the hydraulic control system also has the functions of in-place buffering and constant power control.
Disclosure of Invention
The invention provides an electro-hydraulic compound control system, an electro-hydraulic compound control method and an operation machine, which are used for overcoming the defects of single control mode and low control and adjustment accuracy rate of a hydraulic control system in the prior art, realizing electro-hydraulic compound control, and achieving high response speed and multi-mode operation.
The invention provides an electro-hydraulic compound control system which comprises a controller, a hydraulic oil output unit, an action execution valve unit and an action instruction unit, wherein the input end of the controller is electrically connected with the hydraulic oil output unit and used for acquiring a rotating speed value signal of the hydraulic oil output unit and converting the rotating speed value signal into a current value signal, and the output end of the controller is electrically connected with the action execution valve unit and used for conveying the current value signal to the action execution valve unit;
the hydraulic oil output unit is connected with the action execution valve unit and used for conveying hydraulic oil to the action execution valve unit;
the action instruction unit is connected with the action execution valve unit and used for sending an action instruction to the action execution valve unit.
According to the electro-hydraulic compound control system provided by the invention, the hydraulic oil output unit comprises an engine and a load sensitive pump, the engine is electrically connected with the input end of the controller, the load sensitive pump is in transmission connection with the output end of the engine, and the output end of the load sensitive pump is connected with the action execution valve unit.
According to the electro-hydraulic compound control system provided by the invention, the action command unit comprises a first operating handle and a second operating handle;
the action execution valve unit comprises a first action valve group and a second action valve group, and an oil inlet of the first action valve group and an oil inlet of the second action valve group are both connected with the output end of the load sensitive pump;
the first operating handle is connected with the first action valve group, and the second operating handle is connected with the second action valve group.
According to the electro-hydraulic compound control system provided by the invention, the first action valve group comprises a first action proportional valve, a first action reversing valve and a first action proportional valve, wherein the input end of the first action proportional valve is connected with a first instruction output port of the first operating handle, the output end of the first action proportional valve is connected with a first instruction input port of the first action reversing valve, the input end of the first action proportional valve is connected with a second instruction output port of the first operating handle, and the output end of the first action proportional valve is connected with a second instruction input port of the first action reversing valve;
an oil inlet of the first action reversing valve is connected with an output end of the load sensitive pump, a first working oil port of the first action reversing valve is a first action falling output port, and a second working oil port of the first action reversing valve is a first action starting output port.
According to the electro-hydraulic compound control system provided by the invention, the first action valve group further comprises a first action compensation valve and a first shuttle valve, the first action compensation valve is connected with the first action reversing valve, and the first shuttle valve is respectively connected with the first action compensation valve and a load feedback oil port of the load sensitive pump.
According to the electro-hydraulic compound control system provided by the invention, the first action valve group further comprises a first action one-way overflow valve, an oil inlet of the first action one-way overflow valve is connected with an oil tank, and an oil outlet of the first action one-way overflow valve is connected with the first action drop output port.
According to the electro-hydraulic compound control system provided by the invention, the second action valve group comprises a second action proportional valve, a second action reversing valve and a second action proportional valve, wherein the input end of the second action proportional valve is connected with a first instruction output port of the second operating handle, the output end of the second action proportional valve is connected with a first instruction input port of the second action reversing valve, the input end of the second action proportional valve is connected with a second instruction output port of the second operating handle, and the output end of the second action proportional valve is connected with a second instruction input port of the second action reversing valve;
an oil inlet of the second action reversing valve is connected with an output end of the load sensitive pump, a first working oil port of the second action reversing valve is a second action falling output port, and a second working oil port of the second action reversing valve is a second action starting output port.
According to the electro-hydraulic compound control system provided by the invention, the second action valve group further comprises a second action compensation valve and a second shuttle valve, the second action compensation valve is connected with the second action reversing valve, and the second shuttle valve is respectively connected with the second action compensation valve and a load feedback oil port of the load sensitive pump.
According to the electro-hydraulic compound control system provided by the invention, the second action valve group further comprises a second action one-way overflow valve, an oil inlet of the second action one-way overflow valve is connected with an oil tank, and an oil outlet of the second action one-way overflow valve is connected with the second action drop output port.
According to the electro-hydraulic compound control system provided by the invention, a safety valve is arranged between the load sensitive pump and the oil tank.
The invention also provides an electro-hydraulic compound control method, which comprises the following steps:
sending an action command to the action execution valve unit through the action command unit;
hydraulic oil is conveyed to the action execution valve unit through the hydraulic oil output unit;
collecting a rotating speed value signal of a hydraulic oil output unit through a controller, and correspondingly converting the rotating speed value signal into a current value signal;
and transmitting the current value signal to the action execution valve unit through the controller to control the opening degree of the valve.
The invention also provides a working machine comprising the electro-hydraulic compound control system.
The invention provides an electro-hydraulic compound control system, an electro-hydraulic compound control method and an operation machine, which comprise a controller, a hydraulic oil output unit, an action execution valve unit and an action instruction unit, wherein the input end of the controller is electrically connected with the hydraulic oil output unit, and the output end of the controller is electrically connected with the action execution valve unit; the action instruction unit is connected with the action execution valve unit and used for sending an action instruction to the action execution valve unit, the rotating speed value signal of the hydraulic oil output unit is collected through the controller and is correspondingly converted into a current value signal, and the current value signal is sent to the action execution valve unit, so that the input current of the action execution valve is adjusted, the opening degree of the control valve is adjusted, the saturation state of the action execution valve unit is guaranteed, the response speed is high, and the flow distribution control and adjustment accuracy is high.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an electro-hydraulic compound control system provided by the present invention;
reference numerals:
1. a first operating handle; 2. a safety valve; 3. an engine; 4. a load-sensitive pump; 5. a first motion compensation valve; 6. a first motion reversing valve; 7. a first action proportional valve; 8. a second motion compensation valve; 9. a second motion reversing valve; 10. a second action proportional valve; 11. a second operating handle; 12. a second action one-way overflow valve; 13. a second shuttle valve; 14. a second action proportional valve; 15. a first action one-way overflow valve; 16. a first shuttle valve; 17. a first actuation proportional valve; 18. and a controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The following describes an electro-hydraulic compound control system of the present invention with reference to fig. 1, which includes a controller 18, a hydraulic oil output unit, an action execution valve unit and an action instruction unit, wherein an input end of the controller 18 is electrically connected to the hydraulic oil output unit, and is configured to obtain a rotation speed value signal of the hydraulic oil output unit and convert the rotation speed value signal into a current value signal;
the output end of the controller 18 is electrically connected with the action execution valve unit and used for transmitting a current value signal to the action execution valve unit;
the hydraulic oil output unit is connected with the action execution valve unit and used for conveying hydraulic oil to the action execution valve unit;
the action instruction unit is connected with the action execution valve unit and used for sending action instructions to the action execution valve unit. It is understood that the input terminal of the controller 18 is electrically connected to the hydraulic oil output unit for receiving the rotation speed value signal of the hydraulic oil output unit, and the controller 18 converts the rotation speed value signal into the current value signal. The output end of the controller 18 is electrically connected with the action execution valve unit to transmit the current value signal to the action execution valve unit, and the action execution valve unit corresponds to the opening degree of the regulating valve according to the magnitude of the current value to realize the saturation state adaptation of the action execution valve unit and the hydraulic oil output unit.
The hydraulic oil output unit is used for conveying hydraulic oil to the action execution valve unit, and the conveying amount of the hydraulic oil is in direct proportion to the rotating speed value of the hydraulic oil output unit. The action instruction unit is connected with the action execution valve unit and used for sending an action instruction to the action execution valve unit, the action execution valve unit performs corresponding action according to the action instruction, and the hydraulic oil output unit provides corresponding hydraulic oil.
According to the electro-hydraulic compound control system provided by the invention, a hydraulic oil output unit comprises an engine 3 and a load sensitive pump 4, the engine 3 is electrically connected with an input end of a controller 18, the load sensitive pump 4 is in transmission connection with an output end of the engine 3, and an output end of the load sensitive pump 4 is connected with an action execution valve unit. It can be understood that the hydraulic oil output unit comprises an engine 3 and a load-sensitive pump 4, and the output end of the engine 3 is in transmission connection with the load-sensitive pump 4 to provide pumping power for the load-sensitive pump 4, so as to realize the delivery of hydraulic oil to the action execution valve unit. The engine 3 is electrically connected with the input end of the controller 18, and the receiving of the rotating speed value signal of the engine 3 is realized. The input end of the load-sensitive pump 4 is connected with the oil tank.
According to the electro-hydraulic compound control system provided by the invention, the action command unit comprises a first operating handle 1 and a second operating handle 11;
the action execution valve unit comprises a first action valve group and a second action valve group, and an oil inlet of the first action valve group and an oil inlet of the second action valve group are both connected with an output end of the load sensitive pump 4;
the first operating handle 1 is connected with the first action valve group, and the second operating handle 11 is connected with the second action valve group. It is understood that the action command unit includes a first operation handle 1 and a second operation handle 11, which are respectively used for correspondingly sending action commands. The specific number of the operating handles can be set according to actual configuration and requirements.
The action execution valve unit comprises a first action valve group and a second action valve group, and the output end of the load sensitive pump 4 is connected with the oil inlet of the first action valve group and the oil inlet of the second action valve group respectively, so that hydraulic oil is pumped to the first action valve group and the second action valve group respectively.
Further, a first operating handle 1 is connected with the first action valve group, the first operating handle 1 correspondingly sends an action instruction to the first action valve group, and the first action valve group receives the action instruction and makes a corresponding action. The second operating handle 11 is connected with the second action valve group, the second operating handle 11 correspondingly sends an action instruction to the second action valve group, and the second action valve group receives the action instruction and makes a corresponding action.
It should be noted that the action command packet in this embodiment includes an action start command and an action stop command.
According to the electro-hydraulic compound control system provided by the invention, a first action valve group comprises a first action proportional valve 7, a first action reversing valve 6 and a first action proportional valve 17, wherein the input end of the first action proportional valve 7 is connected with a first instruction output port of a first operating handle 1, the output end of the first action proportional valve 7 is connected with a first instruction input port of the first action reversing valve 6, the input end of the first action proportional valve 17 is connected with a second instruction output port of the first operating handle 1, and the output end of the first action proportional valve 17 is connected with a second instruction input port of the first action reversing valve 6;
an oil inlet of the first action reversing valve 6 is connected with an output end of the load sensitive pump 4, a first working oil port of the first action reversing valve 6 is a first action falling output port, and a second working oil port of the first action reversing valve 6 is a first action starting output port. It can be understood that the first operating handle 1 is provided with a first instruction output port and a second instruction output port, which respectively output an action start instruction and an action stop instruction. The first action reversing valve 6 is correspondingly provided with a first instruction input port and a second instruction input port which respectively and correspondingly receive an action-down instruction and an action-up instruction. The first instruction input port is connected with the first instruction output port through an oil path, a first action proportional valve 7 is arranged on the oil path, and the first action proportional valve 7 is used for secondary pressure reduction or pressure reduction. The second instruction input port is connected with the second instruction output port through an oil path, a first action starting proportional valve 17 is arranged on the oil path, and the first action device proportional valve is used for secondary pressure reduction.
An oil inlet of the first action reversing valve 6 is connected with an output end of the load sensitive pump 4, and hydraulic oil is pumped to the first action reversing valve 6. The first action reversing valve 6 is provided with a first working oil port and a second working oil port which are connected with the first action executing mechanism, so that the action of the first action executing mechanism is realized.
According to the electro-hydraulic compound control system provided by the invention, the first action valve group further comprises a first action compensation valve 5 and a first shuttle valve 16, the first action compensation valve 5 is connected with the first action reversing valve 6, and the first shuttle valve 16 is respectively connected with the first action compensation valve 5 and a load feedback oil port of the load sensitive pump 4. It can be understood that the hydraulic oil flows through the first motion reversing valve 6 and enters the first motion compensation valve 5, and then the pressure of the hydraulic oil is fed back to the load feedback oil port of the load sensitive pump 4 through the first shuttle valve 16, and the load sensitive pump 4 adjusts the output flow of the hydraulic oil, thereby implementing the motion execution of the first motion execution mechanism.
According to the electro-hydraulic compound control system provided by the invention, the first action valve group further comprises a first action one-way overflow valve 15, an oil inlet of the first action one-way overflow valve 15 is connected with an oil tank, and an oil outlet of the first action one-way overflow valve 15 is connected with a first action drop output port. It can be understood that first action check relief valve 15 is used to limit the pressure of the first action actuator during the action dropping process or to supplement oil to the first action actuator during the action dropping process.
According to the electro-hydraulic compound control system provided by the invention, the second action valve group comprises a second action proportional valve 10, a second action reversing valve 9 and a second action proportional valve 14, wherein the input end of the second action proportional valve 10 is connected with a first instruction output port of a second operating handle 11, the output end of the second action proportional valve is connected with a first instruction input port of the second action reversing valve 9, the input end of the second action proportional valve 14 is connected with a second instruction output port of the second operating handle 11, and the output end of the second action proportional valve 14 is connected with a second instruction input port of the second action reversing valve 9;
an oil inlet of the second action reversing valve 9 is connected with an output end of the load sensitive pump 4, a first working oil port of the second action reversing valve 9 is a second action drop output port, and a second working oil port of the second action reversing valve 9 is a second action start output port. It can be understood that the second operating handle 11 is provided with a first instruction output port and a second instruction output port, which respectively output a motion-down instruction and a motion-up instruction. The second action reversing valve 9 is correspondingly provided with a first instruction input port and a second instruction input port which respectively and correspondingly receive an action-down instruction and an action-up instruction. The first instruction input port is connected with the first instruction output port through an oil path, a second action proportional valve 10 is arranged on the oil path, and the second action proportional valve 10 is used for secondary pressure reduction. The second instruction input port is connected with the second instruction output port through an oil path, a second action starting proportional valve 14 is arranged on the oil path, and the second action device proportional valve is used for secondary pressure reduction.
An oil inlet of the second action reversing valve 9 is connected with an output end of the load sensitive pump 4, so that hydraulic oil is pumped to the second action reversing valve 9. The second action reversing valve 9 is provided with a first working oil port and a second working oil port which are connected with the second action executing mechanism, so that the action of the second action executing mechanism is realized.
According to the electro-hydraulic compound control system provided by the invention, the second action valve group further comprises a second action compensation valve 8 and a second shuttle valve 13, the second action compensation valve 8 is connected with the second action reversing valve 9, and the second shuttle valve 13 is respectively connected with the second action compensation valve 8 and a load feedback oil port of the load sensitive pump 4. It can be understood that the hydraulic oil flows through the second motion reversing valve 9 and enters the second motion compensation valve 8, and then the pressure of the hydraulic oil is fed back to the load feedback oil port of the load sensitive pump 4 through the second shuttle valve 13, and the load sensitive pump 4 adjusts the output flow of the hydraulic oil, thereby implementing the motion execution of the second motion execution mechanism.
According to the electro-hydraulic compound control system provided by the invention, the second action valve group further comprises a second action one-way overflow valve 12, an oil inlet of the second action one-way overflow valve 12 is connected with an oil tank, and an oil outlet of the second action one-way overflow valve 12 is connected with a second action drop output port. It can be understood that the second action one-way relief valve 12 is used for limiting the pressure of the second action executing mechanism in the action dropping process or supplementing oil to the second action executing mechanism in the action dropping process.
According to the electro-hydraulic compound control system provided by the invention, a safety valve 2 is arranged between a load sensitive pump 4 and an oil tank. It can be understood that, in order to ensure the safety of the pressure of the oil circuit of the load-sensitive pump 4 in the pumping process, a safety valve 2 is arranged between the load-sensitive pump 4 and the oil tank. In this embodiment, the relief valve 2 is an overflow valve.
The electro-hydraulic compound control method provided by the invention is described below, and the electro-hydraulic compound control method described below and the electro-hydraulic compound control system described above can be referred to correspondingly.
The invention also provides an electro-hydraulic compound control method, which comprises the following steps:
sending an action command to the action execution valve unit through the action command unit;
hydraulic oil is conveyed to the action execution valve unit through the hydraulic oil output unit;
acquiring a rotating speed value signal of a hydraulic oil output unit through the controller 18, and correspondingly converting the rotating speed value signal into a current value signal;
the opening degree of the valve is controlled by transmitting a current value signal to the operation execution valve unit through the controller 18.
The invention provides an electro-hydraulic compound control method, which specifically comprises the following steps:
the first operating handle 1 outputs an action command
By operating the first operating handle 1 to swing leftwards, referring to fig. 1, the first command output port outputs primary pressure-reducing hydraulic oil, the primary pressure-reducing hydraulic oil is conveyed to the first action proportional valve 7 through an oil way, and after secondary pressure reduction of the first action proportional valve 7, the primary pressure-reducing hydraulic oil enters a control cavity of the first action directional valve 6 through the first command input port of the first action directional valve 6 to push a valve core to move, and the first action directional valve 6 is opened in a parallel position;
hydraulic oil output by the load sensitive pump 4 enters from an oil inlet of a first action reversing valve 6 and then passes through a first action compensation valve 5, a first working oil port of the first action reversing valve 6 corresponds to a first action drop output port of the whole system, and the hydraulic oil acts on action drops of a first action execution mechanism; meanwhile, the pressure of the hydraulic oil compensated by the first shuttle valve 16 through the first action compensation valve 5 is fed back to a load feedback oil port of the load sensitive pump 4, the output flow of the load sensitive pump 4 is adjusted, and the first action executing mechanism is further pushed to move downwards; the first action one-way overflow valve 15 limits the pressure of hydraulic oil in the falling motion process of the first action executing mechanism or supplements the hydraulic oil in the falling motion process of the first action executing mechanism;
the valve core of the first action reversing valve 6 can be pushed to the maximum displacement by the pressure after the pressure is reduced once by the first operating handle 1, the pressure after the pressure is reduced once can be reduced again by controlling the current of the first action proportional valve 7, and the smaller the current of the first action proportional valve 7 is, the more the pressure is reduced; when the current is maximum, the pressure is the same as the pressure after the first decompression. The electro-hydraulic compound control is realized through the first action of operating the handle for primary pressure reduction and the second action of the first action of falling proportion valve 7 for secondary pressure reduction;
that is, the controller 18 correlates the input current of the first motion proportional valve 7 with the rotation speed of the engine 3, and the controller 18 collects the rotation speed of the engine 3 and determines the magnitude of the input current of the first motion proportional valve 7 accordingly. The larger the rotation speed of the engine 3, the larger the current input to the first action proportional valve 7.
In this embodiment, when the rotation speed of the engine 3 reaches the maximum, 2000 rpm is obtained, and the current input to the first motion proportional valve 7 is also the maximum, 700mA, thereby ensuring that the first motion directional valve 6 is in the saturation state.
The first operating handle 1 outputs an action start instruction
By operating the first operating handle 1 to swing rightwards, referring to fig. 1, the first pressure-reducing hydraulic oil is output from the second instruction output port, is delivered to the first action starting proportional valve 17 through the oil way, and enters the control cavity of the first action reversing valve 6 through the second instruction input port of the first action reversing valve 6 after being subjected to secondary pressure reduction of the first action starting proportional valve 17, so that the valve core is pushed to move, and the first action reversing valve 6 is opened in a parallel position;
hydraulic oil output by the load sensitive pump 4 enters from an oil inlet of a first action reversing valve 6 and is supplemented to the first action reversing valve 6 through a first action compensation valve 5, a second working oil port of the first action reversing valve 6 corresponds to a first action starting output port of the whole system, and the hydraulic oil acts on a first action executing mechanism to start action; meanwhile, the pressure of the hydraulic oil compensated by the first shuttle valve 16 through the first motion compensation valve 5 is fed back to a load feedback oil port of the load sensitive pump 4, so as to adjust the output flow of the load sensitive pump 4 and further push the first motion actuator to lift;
the valve core of the first action reversing valve 6 can be pushed to the maximum displacement by the pressure after the first pressure reduction through the first operating handle 1, the pressure after the first pressure reduction can be reduced again by controlling the current of the first action starting proportional valve 17, and the smaller the current of the first action starting proportional valve 17 is, the more the pressure reduction is; when the current is maximum, the pressure is the same as the pressure after the first decompression. The electro-hydraulic compound control is realized through the first action of operating the handle for primary pressure reduction and the second action of the first action of falling proportion valve 7 for secondary pressure reduction;
that is, the controller 18 correlates the input current of the first actuated proportional valve 17 with the rotational speed of the engine 3, and the controller 18 collects the rotational speed of the engine 3 and determines the magnitude of the input current of the first actuated proportional valve 17 accordingly. The larger the rotation speed of the engine 3, the larger the current input to the first-action proportional valve 17.
The second operating handle 11 outputs an action command
By operating the second operating handle 11 to swing rightwards, referring to fig. 1, the first instruction output port outputs primary pressure-reducing hydraulic oil, the primary pressure-reducing hydraulic oil is conveyed to the second action proportional valve 10 through an oil way, and after secondary pressure reduction of the second action proportional valve 10, the primary pressure-reducing hydraulic oil enters a control cavity of the second action directional valve 9 through the first instruction input port of the second action directional valve 9 to push the valve core to move, and the second action directional valve 9 is opened in parallel;
hydraulic oil output by the load sensitive pump 4 enters from an oil inlet of a second action reversing valve 9, the second action reversing valve 9 is supplemented with oil through a second action compensation valve 8, a first working oil port of the second action reversing valve 9 corresponds to a second action drop output port of the whole system, and the hydraulic oil acts on action drops of a second action execution mechanism; meanwhile, the pressure of the hydraulic oil compensated by the second shuttle valve 13 through the second action compensation valve 8 is fed back to a load feedback oil port of the load sensitive pump 4, the output flow of the load sensitive pump 4 is adjusted, and the second action executing mechanism is further pushed to move downwards; the second action one-way overflow valve 12 limits the pressure of hydraulic oil in the falling motion process of the second action execution mechanism or supplements the hydraulic oil in the falling motion process of the second action execution mechanism;
the valve core of the second action reversing valve 9 can be pushed to the maximum displacement by the pressure after being subjected to primary pressure reduction through the second operating handle 11, the pressure after primary pressure reduction can be subjected to secondary pressure reduction by controlling the current of the second action proportional valve 10, and the smaller the current of the second action proportional valve 10 is, the more the pressure reduction is; when the current is maximum, the pressure is the same as the pressure after the first decompression. The electro-hydraulic compound control is realized through the first pressure reduction of the second action operating handle and the second pressure reduction of the second action proportional valve 10;
that is, the controller 18 correlates the input current of the second operation proportional valve 10 with the rotation speed of the engine 3, and the controller 18 collects the rotation speed of the engine 3 and determines the magnitude of the input current of the second operation proportional valve 10 accordingly. The larger the rotation speed of the engine 3, the larger the current input to the second action proportional valve 10.
The second operation handle 11 outputs an operation start instruction
By operating the second operating handle 11 to swing leftwards, referring to fig. 1, the first pressure-reducing hydraulic oil is output from the second command output port, and is delivered to the second action starting proportional valve 14 through the oil path, and after the second pressure reduction of the second action starting proportional valve 14, enters the control cavity of the second action reversing valve 9 through the second command input port of the second action reversing valve 9, so as to push the valve core to move, and the second action reversing valve 9 is opened in a parallel position;
hydraulic oil output by the load sensitive pump 4 enters from an oil inlet of a second action reversing valve 9, the second action compensating valve 8 is used for supplementing oil to the second action reversing valve 9, a second working oil port of the second action reversing valve 9 corresponds to a second action starting output port of the whole system, and the hydraulic oil acts on a second action executing mechanism to start action; meanwhile, the pressure of the hydraulic oil compensated by the second shuttle valve 13 through the second motion compensation valve 8 is fed back to a load feedback oil port of the load sensitive pump 4, the output flow of the load sensitive pump 4 is adjusted, and the second motion actuator is further pushed to lift;
the valve core of the second action reversing valve 9 can be pushed to the maximum displacement by the pressure after being subjected to primary pressure reduction through the second operating handle 11, the pressure after primary pressure reduction can be subjected to secondary pressure reduction by controlling the current of the second action starting proportional valve 14, and the smaller the current of the second action starting proportional valve 14 is, the more the pressure reduction is; when the current is maximum, the pressure is the same as the pressure after the first decompression. The electro-hydraulic compound control is realized through the first pressure reduction of the second action operating handle and the second pressure reduction of the second action starting proportional valve 14;
that is, the controller 18 correlates the input current of the second acting proportional valve 14 with the rotation speed of the engine 3, and the controller 18 collects the rotation speed of the engine 3 and determines the magnitude of the input current of the second acting proportional valve 14 accordingly. The larger the rotation speed of the engine 3, the larger the current input to the second-action proportional valve 14.
The invention also provides a working machine comprising the electro-hydraulic compound control system.
The invention provides an electro-hydraulic compound control system, an electro-hydraulic compound control method and an operation machine, which comprise a controller, a hydraulic oil output unit, an action execution valve unit and an action instruction unit, wherein the input end of the controller is electrically connected with the hydraulic oil output unit, and the output end of the controller is electrically connected with the action execution valve unit; the action instruction unit is connected with the action execution valve unit and used for sending an action instruction to the action execution valve unit, the rotating speed value signal of the hydraulic oil output unit is collected through the controller and is correspondingly converted into a current value signal, and the current value signal is sent to the action execution valve unit, so that the input current of the action execution valve is adjusted, the opening degree of the control valve is adjusted, the saturation state of the action execution valve unit is guaranteed, the response speed is high, and the flow distribution control and adjustment accuracy is high.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The electro-hydraulic compound control system is characterized by comprising a controller, a hydraulic oil output unit, an action execution valve unit and an action instruction unit, wherein the input end of the controller is electrically connected with the hydraulic oil output unit and used for acquiring a rotating speed value signal of the hydraulic oil output unit and converting the rotating speed value signal into a current value signal;
the output end of the controller is electrically connected with the action execution valve unit and used for transmitting a current value signal to the action execution valve unit;
the hydraulic oil output unit is connected with the action execution valve unit and used for conveying hydraulic oil to the action execution valve unit;
the action instruction unit is connected with the action execution valve unit and used for sending an action instruction to the action execution valve unit.
2. The electro-hydraulic compound control system of claim 1, wherein the hydraulic oil output unit comprises an engine and a load sensitive pump, the engine is electrically connected with an input end of the controller, the load sensitive pump is in transmission connection with an output end of the engine, and an output end of the load sensitive pump is connected with the action execution valve unit.
3. The electro-hydraulic compound control system of claim 2, wherein the motion command unit comprises a first operating handle and a second operating handle;
the action execution valve unit comprises a first action valve group and a second action valve group, and an oil inlet of the first action valve group and an oil inlet of the second action valve group are both connected with the output end of the load sensitive pump;
the first operating handle is connected with the first action valve group, and the second operating handle is connected with the second action valve group.
4. The electro-hydraulic compound control system of claim 3, wherein the first action valve group comprises a first action proportional valve, a first action reversing valve and a first action proportional valve, an input end of the first action proportional valve is connected with a first command output port of the first operating handle, an output end of the first action proportional valve is connected with a first command input port of the first action reversing valve, an input end of the first action proportional valve is connected with a second command output port of the first operating handle, and an output end of the first action proportional valve is connected with a second command input port of the first action reversing valve;
an oil inlet of the first action reversing valve is connected with an output end of the load sensitive pump, a first working oil port of the first action reversing valve is a first action falling output port, and a second working oil port of the first action reversing valve is a first action starting output port.
5. The electro-hydraulic compound control system of claim 4, wherein the first motion valve set further comprises a first motion compensation valve and a first shuttle valve, the first motion compensation valve is connected with the first motion reversing valve, and the first shuttle valve is respectively connected with the first motion compensation valve and a load feedback oil port of the load sensitive pump;
the first action valve group further comprises a first action one-way overflow valve, an oil inlet of the first action one-way overflow valve is connected with the oil tank, and an oil outlet of the first action one-way overflow valve is connected with the first action drop output port.
6. The electro-hydraulic compound control system of claim 3, wherein the second action valve group comprises a second action proportional valve, a second action reversing valve and a second action proportional valve, an input end of the second action proportional valve is connected with a first command output port of the second operating handle, an output end of the second action proportional valve is connected with a first command input port of the second action reversing valve, an input end of the second action proportional valve is connected with a second command output port of the second operating handle, and an output end of the second action proportional valve is connected with a second command input port of the second action reversing valve;
an oil inlet of the second action reversing valve is connected with an output end of the load sensitive pump, a first working oil port of the second action reversing valve is a second action falling output port, and a second working oil port of the second action reversing valve is a second action starting output port.
7. The electro-hydraulic compound control system of claim 6, wherein the second motion valve set further comprises a second motion compensation valve and a second shuttle valve, the second motion compensation valve is connected with the second motion reversing valve, and the second shuttle valve is respectively connected with the second motion compensation valve and a load feedback oil port of the load sensitive pump.
8. The electro-hydraulic compound control system of claim 6, wherein the second action valve group further comprises a second action one-way overflow valve, an oil inlet of the second action one-way overflow valve is connected with an oil tank, and an oil outlet of the second action one-way overflow valve is connected with the second action drop output port.
9. An electro-hydraulic compound control method is characterized by comprising the following steps:
sending an action command to the action execution valve unit through the action command unit;
hydraulic oil is conveyed to the action execution valve unit through the hydraulic oil output unit;
collecting a rotating speed value signal of a hydraulic oil output unit through a controller, and correspondingly converting the rotating speed value signal into a current value signal;
and transmitting the current value signal to the action execution valve unit through the controller to control the opening degree of the valve.
10. A work machine comprising an electro-hydraulic compound control system according to any one of claims 1 to 8.
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| CN202111643719.3A CN114321108B (en) | 2021-12-29 | 2021-12-29 | Electrohydraulic composite control system and method and working machine |
| PCT/CN2022/090506 WO2023123782A1 (en) | 2021-12-29 | 2022-04-29 | Electro-hydraulic combined control system, method, and operation machine |
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| CN202111643719.3A CN114321108B (en) | 2021-12-29 | 2021-12-29 | Electrohydraulic composite control system and method and working machine |
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| WO2023123782A1 (en) * | 2021-12-29 | 2023-07-06 | 湖南三一中型起重机械有限公司 | Electro-hydraulic combined control system, method, and operation machine |
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| CN117780702B (en) * | 2024-01-19 | 2024-06-25 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Distributed hydraulic energy control method and system for aircraft |
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| CN114321108B (en) | 2023-06-13 |
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