CN113090599B - Logic control valve and hydraulic system - Google Patents
Logic control valve and hydraulic system Download PDFInfo
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- CN113090599B CN113090599B CN202110351225.1A CN202110351225A CN113090599B CN 113090599 B CN113090599 B CN 113090599B CN 202110351225 A CN202110351225 A CN 202110351225A CN 113090599 B CN113090599 B CN 113090599B
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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
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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
- 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
- F15B2211/20538—Type of pump constant capacity
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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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- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a logic control valve and a hydraulic system, which comprise a power source I, a logic control valve, an execution valve, an overflow valve and a power source II; the invention integrates the reversing valve, the hydraulic control reversing valve and the electromagnetic reversing valve through the arranged logic control valve, and can realize the quick switching of large flow and small flow; by arranging the overflow valve, the second power source is unloaded when small flow is needed, and the first power source continues to work; when large flow is needed, the first power source and the second power source are combined. The flow required by the actuating mechanism is provided according to the requirement by matching the corresponding flow of the actuating mechanism, so that the power loss can be greatly reduced, and the energy conservation is realized.
Description
Technical Field
The invention belongs to the technical field of engineering machinery, relates to a logic control valve, and further relates to a hydraulic system using the logic control valve.
Background
At present, engineering mechanical equipment at home and abroad is provided with a plurality of actuating mechanisms for meeting the requirements of different working conditions; and the flow rates required by the various actuators are different. At present, the flow input into the execution valve can not be identified and matched according to working conditions, so that the power loss is large and the energy is wasted.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a logic control valve, realizes the quick switching of large flow and small flow, and is suitable for various engineering mechanical equipment.
In order to solve the above technical problem, the present invention provides a logic control valve, including: the reversing valve, the hydraulic control reversing valve, the electromagnetic reversing valve and the shuttle valve; the oil return valve also comprises a flow combining port EF, a signal port Ls1, a signal port Ls2, a signal port Ls3, an oil outlet A and an oil return port T;
the signal port Ls and the signal port Ls1 are respectively connected with two oil inlets of the shuttle valve, and an oil outlet of the shuttle valve is communicated with an oil port n of the electromagnetic directional valve; one path of an oil port m of the electromagnetic directional valve is connected to the control end of the hydraulic control directional valve, and the other path of the oil port m is connected with a signal port Ls 3;
an oil port g of the hydraulic control reversing valve is connected with an oil port m of the electromagnetic reversing valve, an oil port e of the hydraulic control reversing valve is connected with a pilot control end of the reversing valve, and an oil port f of the hydraulic control reversing valve is connected with a signal port Ls 2;
an oil port c of the reversing valve is connected with a confluence port EF, an oil port d of the reversing valve is connected with an oil outlet A, and a spring cavity of the reversing valve is connected with an oil return port T; an oil path between the oil outlet A and the oil outlet d and an oil path between the oil outlet f and the signal port Ls2 are intersected and communicated;
the signal port Ls and the signal port Ls1 are used for connecting pilot pressures at the left end and the right end of the actuating mechanism;
the flow combining port EF is used for being connected with a first power source, the signal port Ls2 is used for being connected with a signal port of the first power source, and the oil return port T is used for being connected with a hydraulic oil tank;
the oil outlet A is used for providing working oil for the actuating mechanism;
the signal port Ls3 is used for outputting a control signal for unloading the second power source.
The specific working process of the logic control valve is as follows:
when the electromagnetic directional valve is electrified, the oil port m and the oil port n of the electromagnetic directional valve are disconnected, so that an oil path from the shuttle valve to the signal port Ls3 and the hydraulic control directional valve is disconnected; therefore, on one hand, the signal port Ls3 has no signal output, and the power source II works; on the other hand, an oil port e and an oil port f of the hydraulic control reversing valve are communicated with an oil port c and an oil port d of the reversing valve to form an oil passage of a confluence port EF-oil passage c-d-oil outlet A, so that the first power source and the second power source are converged to serve as a power source of the actuating mechanism;
when the electromagnetic directional valve is not electrified, an oil port m and an oil port n of the electromagnetic directional valve are communicated, so that an oil path from the shuttle valve to a signal port Ls3 to the hydraulic control directional valve is communicated; therefore, on one hand, the signal port Ls3 transmits the signal output selected from the signal port Ls and the signal port Ls1 to control the unloading of the second power source; on the other hand, an oil port e and an oil port g of the hydraulic control reversing valve are communicated, an oil port c and an oil port d of the reversing valve are communicated, and an oil channel of a confluence port EF-oil channel c-d-oil outlet A is formed, so that the first power source serves as the power source of the actuating mechanism.
Optionally, the reversing valve is a proportional reversing valve.
Optionally, the directional valve is a two-position two-way valve, the hydraulic control directional valve is a two-position three-way valve, and the electromagnetic directional valve is a two-position two-way valve.
Correspondingly, the invention also provides a hydraulic system, comprising:
the hydraulic control system comprises a power source I, a logic control valve, an execution valve, a one-way valve, an overflow valve, a power source II and a hydraulic oil tank;
a confluence port EF of the logic control valve is communicated with an oil outlet of the first power source, a signal port Ls2 of the logic control valve is connected with a signal port X of the first power source, and an oil return port T of the logic control valve is connected with a hydraulic oil tank; a signal port Ls3 of the logic control valve is connected with one pilot control end of the overflow valve, an oil outlet A of the logic control valve is connected with an oil inlet P of the execution valve, and the signal port Ls1 of the logic control valve are respectively connected with pilot pressures at two ends of the execution valve;
one path of an oil outlet of the power source II is connected with an oil inlet P of the execution valve through a one-way valve, the other path of the oil outlet of the power source II is connected with a front cavity of the overflow valve, and the other path of the oil outlet of the power source II is connected with the other pilot control end of the overflow valve;
working ports at two ends of the execution valve are used for being connected with the execution mechanism to control the action of the execution mechanism;
the logic control valve includes: the reversing valve, the hydraulic control reversing valve, the electromagnetic reversing valve and the shuttle valve;
the signal port Ls and the signal port Ls1 are respectively connected with two oil inlets of the shuttle valve, and an oil outlet of the shuttle valve is communicated with an oil port n of the electromagnetic directional valve; one path of an oil port m of the electromagnetic directional valve is connected to the control end of the hydraulic control directional valve, and the other path of the oil port m is connected with a signal port Ls 3;
an oil port g of the hydraulic control reversing valve is connected with an oil port m of the electromagnetic reversing valve, an oil port e of the hydraulic control reversing valve is connected with a pilot control end of the reversing valve, and an oil port f of the hydraulic control reversing valve is connected with a signal port Ls 2;
an oil port c of the reversing valve is connected with a confluence port EF, an oil port d of the reversing valve is connected with an oil outlet A, and a spring cavity of the reversing valve is connected with an oil return port T; the oil path between the oil outlet A and the oil outlet d and the oil path between the oil outlet f and the signal port Ls2 are intersected and communicated.
The specific working process of the hydraulic system is as follows:
when the executing mechanism needs large flow and controls the electromagnetic reversing valve to be electrified, the oil port m and the oil port n of the electromagnetic reversing valve are disconnected, so that an oil path from the shuttle valve to the signal port Ls3 to the hydraulic control reversing valve is disconnected; therefore, on one hand, the signal port Ls3 has no signal output, and the power source II works; on the other hand, an oil port e and an oil port f of the hydraulic control reversing valve are communicated with an oil port c and an oil port d of the reversing valve to form a power source I-combined flow port EF-oil duct c-d-oil outlet A-oil duct of the execution valve, so that the power source I and the power source II are combined to serve as a power source of the execution mechanism;
when the actuator needs small flow, the electromagnetic directional valve is controlled not to be electrified, and the oil port m and the oil port n of the electromagnetic directional valve are communicated, so that an oil path between the shuttle valve and the signal port Ls3 and the hydraulic control directional valve is communicated; therefore, on one hand, the signal port Ls3 transmits the signal output selected from the signal port Ls and the signal port Ls1, and the overflow valve is opened to unload the power source II; on the other hand, an oil port e of the hydraulic control reversing valve is communicated with an oil port g, and an oil port c of the reversing valve is communicated with an oil port d to form a power source I-combined flow port EF-oil passage c-d-oil outlet A-oil passage of the actuating valve, so that only the power source I is used as a power source of the actuating mechanism.
Optionally, the reversing valve is a proportional reversing valve.
Optionally, the directional valve is a two-position two-way valve, the hydraulic control directional valve is a two-position three-way valve, and the electromagnetic directional valve is a two-position two-way valve.
Optionally, the power source is a variable displacement pump, and the power source is a fixed displacement pump.
Optionally, the executing mechanism is any one of a movable arm, a tipping bucket, a four-in-one device, a clamping device, a side dumping device, a snow removing device, a coal pushing shovel, a grass grasping machine, a lifting device, a sliding fork device and a quick-change device.
Compared with the prior art, the invention has the following beneficial effects: the invention integrates the reversing valve, the hydraulic control reversing valve and the electromagnetic reversing valve through the arranged logic control valve, and can realize the quick switching of large flow and small flow; therefore, the corresponding flow is matched according to the actuating mechanism, the flow required by the actuating mechanism is provided according to the requirement, the power loss can be greatly reduced, and the energy conservation is realized.
Drawings
FIG. 1 is a schematic diagram of the logic control valve and the oil circuit of the hydraulic system of the present invention;
fig. 2 is a diagram showing an oil passage structure of the logic control valve.
Wherein: 1-power source I, 2-pressure control valve, 3-logic control valve, 4-execution valve, 5-operation control device, 6-one-way valve, 7-overflow valve, 8-power source II, 9-hydraulic oil tank, 10-reversing valve, 11-hydraulic control reversing valve, 12-electromagnetic reversing valve, 13-shuttle valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present patent application, it is noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
In the description of the present patent application, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present patent application. 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 present patent application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present patent can be understood in a specific case by those skilled in the art.
The oil path structure of the hydraulic system of the invention is shown in figure 1 and comprises a first power source 1, a logic control valve 3, an execution valve 4, an operation control device 5, a one-way valve 6, an overflow valve 7, a second power source 8 and a hydraulic oil tank 9;
as shown in fig. 2, the logic control valve 3 includes a directional valve 10, a pilot operated directional valve 11, an electromagnetic directional valve 12, and a shuttle valve 13; the oil return valve also comprises a flow combining port EF, a signal port Ls1, a signal port Ls2, a signal port Ls3, an oil outlet A and an oil return port T;
the signal port Ls and the signal port Ls1 are selected by the shuttle valve 13 and then communicated with the oil port n of the electromagnetic directional valve 12; the signal port Ls and the signal port Ls1 are used for connecting pilot pressures at the left and right ends of the actuator valve 4, and the pilot pressure at either the left or right end can be selected;
one path of the oil port m of the electromagnetic directional valve 12 is connected to the control end of the hydraulic control directional valve 11, the other path is connected to a signal port Ls3,
an oil port g of the hydraulic control reversing valve 11 is connected with an oil port m of the electromagnetic reversing valve 12, an oil port e is connected with a pilot control end of the reversing valve 10, and an oil port f is connected with a signal port Ls 2;
an oil port c of the reversing valve 10 is connected with a joint flow port EF, an oil port d is connected with an oil outlet A, a spring cavity of the reversing valve 10 is connected with an oil return port T, and the oil return port T is connected with a hydraulic oil tank 9;
the oil path between the oil outlet A and the oil outlet d and the oil path between the oil outlet f and the signal port Ls2 are intersected and communicated.
The signal port Ls and the signal port Ls1 are used for connecting pilot pressures at the left end and the right end of the actuating mechanism;
the flow combining port EF is used for being connected with a first power source, the signal port Ls2 is used for being connected with a signal port of the first power source, and the oil return port T is used for being connected with a hydraulic oil tank;
the oil outlet A is used for providing working oil for the actuating mechanism;
the signal port Ls3 is used for outputting a control signal for unloading the second power source.
When the electromagnetic directional valve 12 is electrified, the oil port m and the oil port n of the electromagnetic directional valve 12 are disconnected, so that an oil path from the shuttle valve 13 to the signal port Ls3 and the hydraulic control directional valve 11 is disconnected; therefore, on one hand, the signal port Ls3 has no signal output, and the power source II works; on the other hand, an oil port e and an oil port f of the hydraulic control reversing valve 11 are communicated with an oil port c and an oil port d of the reversing valve 10 to form an oil channel of a confluence port EF-oil channel c-d-oil outlet A, so that the first power source and the second power source are converged to serve as a power source of the actuating mechanism;
when the electromagnetic directional valve 12 is not electrified, the oil port m and the oil port n of the electromagnetic directional valve 12 are communicated, so that the oil path from the shuttle valve 13 to the signal port Ls3 and the hydraulic control directional valve 11 is communicated; therefore, on one hand, the signal port Ls3 transmits the signal output selected from the signal port Ls and the signal port Ls1 to control the unloading of the second power source; on the other hand, the oil port e and the oil port g of the hydraulic control reversing valve 11 are communicated, and the oil port c and the oil port d of the reversing valve 10 are communicated to form an oil channel of a confluence port EF-oil channel c-d-oil outlet A, so that the first power source serves as a power source of the actuating mechanism.
The logic control valve integrates the reversing valve, the hydraulic control reversing valve and the electromagnetic reversing valve, and can realize quick switching of large flow and small flow; by arranging the overflow valve, the second power source is unloaded when small flow is needed, and the first power source continues to work; when a large flow is required, the double pumps merge.
When the logic control valve is applied to a specific hydraulic system, referring to fig. 1, the connection relationship among the valve groups is as follows:
an oil outlet of the power source I1 is communicated with a flow combining port EF of the logic control valve 3, a signal port Ls2 of the logic control valve 3 is connected with a signal port X of the power source I1, a signal port Ls3 of the logic control valve 3 is connected with one pilot control end of the overflow valve 7, an oil outlet A of the logic control valve 3 is connected with an oil inlet P of the execution valve 4, and an oil return port T of the logic control valve 3 is connected with the hydraulic oil tank 9;
one path of an oil outlet of the second power source 8 is connected with an oil inlet P of the executive valve 4 through the one-way valve 6, the other path of the oil outlet is connected with a front cavity of the overflow valve 7, and the other pilot control end of the overflow valve 7 is also taken from an outlet of the second power source 8.
The working port a1 of the control device 5 is connected with the pilot control port a of the execution valve 4, the working port B1 of the control device 5 is connected with the pilot control port B of the execution valve 4, and the working ports A1 and B1 of the execution valve 4 are connected with an execution mechanism; the actuator valve 4 is used to control the action of the actuator.
The electromagnetic directional valve 12 is used for controlling the on-off of an oil path between the shuttle valve 13 and the hydraulic control directional valve 11 so as to control the direction change of the hydraulic control directional valve 11; the pilot operated directional control valve 11 is used to control the direction change of the directional control valve 10.
The working process of the hydraulic system is as follows:
when the executing mechanism needs a large flow, the electromagnetic directional valve 12 is controlled to be powered on, the electromagnetic directional valve 12 is located at the upper position, the oil port m and the oil port n are disconnected, a control signal of the executing valve 4 cannot be transmitted to the hydraulic control directional valve 11 through the electromagnetic directional valve 12, the hydraulic control directional valve 11 is located at the left position, the oil port e is connected with the oil port f (an oil passage f-e is formed), the oil outlet A is connected with the oil inlet P of the executing valve 4, so that the load pressure of the executing mechanism acts on the pilot control end of the directional valve 10 through the oil outlet A and the internal oil passage f-e, the reversing valve 10 is located at the upper position, the oil port c is connected with the oil port d, the oil outlet of the power source I1 outputs hydraulic oil to enter the logic control valve 3 through the confluence port EF, the hydraulic oil flows to the oil outlet A through the internal oil passage c-d and then flows to the executing valve 4 from the oil outlet A to further control the action of the executing mechanism, meanwhile, the control signal of the actuating valve 4 cannot be transmitted from the signal port Ls3 to the pilot control end of the overflow valve 7 through the electromagnetic directional valve 12, so that the overflow valve 7 is kept in a closed state, and therefore, the hydraulic oil output by the oil outlet of the power source II 8 flows into the actuating valve 4, and the confluence of the power source I1 and the power source II 8 is realized to control the action of the actuating mechanism.
When the executing mechanism needs a small flow, the electromagnetic directional valve 12 is controlled not to be powered, the electromagnetic directional valve 12 is located at the lower position, the oil port m and the oil port n are communicated (an oil duct n-m is formed), a control signal of the executing valve 4 is selectively transmitted to the electromagnetic directional valve 12 through the shuttle valve 13 and is transmitted to a pilot control end of the hydraulic directional valve 11 through the oil duct n-m, a valve core of the hydraulic directional valve 11 is pushed to be reversed to be located at the right position, the oil port e and the oil port f (an oil duct f-e) are disconnected, the oil port e and the oil port g are communicated (an oil duct g-e is formed), control pressures of two ports a and b of the executing valve 4 are transmitted to a control end of the directional valve 10 through the shuttle valve 13, the oil duct n-m and the oil duct g-e, so that the directional valve 10 is located at the upper position, the oil port c and the oil port d are communicated, at the time, an oil outlet output of the power source one 1 flows into the logic control valve 3 through a flow-combining port EF, the control signal of the actuating valve 4 is transmitted to a signal port Ls3 through an oil duct n-m of the electromagnetic directional valve 12 and then transmitted to a pilot control end of the overflow valve 7 from a signal port Ls3, so that the overflow valve 7 is in an open state, and the unloading of the second power source 8 through the overflow valve 7 is realized, and only the first power source 1 works.
The actuating mechanism can be any one of a movable arm, a tipping bucket, a four-in-one device, a clamping device, a side dumping device, a snow removing device, a coal pushing shovel, a grass grasping machine, a lifting device, a sliding fork device and a quick-change device. If the actuating mechanism is a side unloading device requiring a small flow, the second power source unloads and the first power source works; if the actuating mechanism is a clamping device requiring large flow, the first power source and the second power source work simultaneously.
The overflow valve 7 is an externally controlled overflow valve, and the Ls3 port of the logic control valve 3 and the outlet pressure of the power source II 8 act on the pilot control end of the overflow valve 7 at the same time. When the load pressure of the actuating mechanism exceeds a set value, a control signal of the actuating mechanism is transmitted to the overflow valve 7, the overflow valve 7 is opened, unloading of the second power source 8 is achieved, and the service life of the second power source 8 is prolonged.
As a further improvement of the present invention, the power source 1 is a variable displacement pump, and the power source 2 is a fixed displacement pump; the directional control valve 10 is a two-position two-way valve, the hydraulic control directional control valve 11 is a two-position three-way valve, and the electromagnetic directional control valve 12 is a two-position two-way valve. In addition, the change valve 10 is a proportional valve (proportional change valve), and the valve core opening degree is determined by the pressure of the control end of the change valve 10, so that the valve core of the change valve 10 is in a floating state according to the pressure of the control end of the change valve, and the servo proportional control of the flow is realized, and the pressure of the control end of the change valve 10 can be the pilot pressure of an actuating mechanism or the load pressure of the actuating mechanism.
The invention can realize the fast switching of large flow and small flow through the arranged logic control valve; by arranging the overflow valve, the second power source is unloaded when small flow is needed, and the first power source continues to work; when a large flow is needed, the first power source and the second power source are combined; and the servo proportional control of the flow can be realized by large and small flows. The flow required by the actuating mechanism is provided according to the requirement by matching the corresponding flow of the actuating mechanism, so that the power loss can be greatly reduced, and the energy conservation is realized.
In the actual work of the hydraulic system, when the complete machine needs to operate the action of the actuating mechanism, the corresponding control device 5 (handle or button) can be operated, when the actuating valve 4 is in the right position, the oil from the pump enters the actuating mechanism through the port a of the actuating valve 4, the circuit returns to the hydraulic oil tank 9 through the port b of the actuating valve 4, and the corresponding action is executed; when the actuating valve 4 is in the left position, the oil from the pump enters the actuating mechanism through the port b of the actuating valve, and the circuit returns to the hydraulic oil tank through the port a of the actuating valve to execute corresponding actions. If the executing mechanism is a side unloading device requiring smaller flow, the electric control button of the electromagnetic directional valve 12 is not operated, the second power source 8 is unloaded, and only the first power source 1 works; if the actuating mechanism is a clamping device requiring large flow, the button is operated to electrify the electromagnetic directional valve 12, and the first power source 1 and the second power source 8 work simultaneously; the specific control decisions of the operating states of the actuators are given in the following table:
TABLE 1 operating conditions of the actuators
| Working state | Electromagnetic directional valve Y1 | Power source two | Power source 1 | Required flow of actuator |
| State 1 | Without power | Relief valve | Work by | Small flow (less than 220L/min) |
| State 2 | Get electricity | Work by | Work by | High flow (220L/min-500L/min) |
Preferably, the hydraulic power source device further comprises a pressure control valve 2, an oil outlet of the power source I1 is further connected with an oil inlet P of the pressure control valve 2, and the pressure control valve is used for reducing pressure impact when the power source I1 is drained back, so that the power source I1 is protected, and the service life of the power source I1 is prolonged.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A logic control valve, comprising: the reversing valve (10), the hydraulic control reversing valve (11), the electromagnetic reversing valve (12) and the shuttle valve (13); the oil return valve also comprises a flow combining port EF, a signal port Ls1, a signal port Ls2, a signal port Ls3, an oil outlet A and an oil return port T;
the signal port Ls and the signal port Ls1 are respectively connected with two oil inlets of the shuttle valve (13), and an oil outlet of the shuttle valve (13) is communicated with an oil port n of the electromagnetic directional valve (12); one path of an oil port m of the electromagnetic directional valve (12) is connected to a control end of the hydraulic control directional valve (11), and the other path is connected with a signal port Ls 3;
an oil port g of the hydraulic control reversing valve (11) is connected with an oil port m of the electromagnetic reversing valve (12), an oil port e of the hydraulic control reversing valve (11) is connected with a pilot control end of the reversing valve (10), and an oil port f of the hydraulic control reversing valve (11) is connected with a signal port Ls 2;
an oil port c of the reversing valve (10) is connected with a confluence port EF, an oil port d of the reversing valve (10) is connected with an oil outlet A, and a spring cavity of the reversing valve (10) is connected with an oil return port T; the oil path between the oil outlet A and the oil port d and the oil path between the oil port f and the signal port Ls2 are intersected and communicated;
the signal port Ls and the signal port Ls1 are used for connecting pilot pressures at the left end and the right end of the actuating mechanism;
the flow combining port EF is used for being connected with a first power source, the signal port Ls2 is used for being connected with a signal port of the first power source, and the oil return port T is used for being connected with a hydraulic oil tank;
the oil outlet A is used for providing working oil for the actuating mechanism;
the signal port Ls3 is used for outputting a control signal for unloading the second power source.
2. A logic control valve according to claim 1, characterized in that the reversing valve (10) is a proportional reversing valve.
3. A logic control valve according to claim 1, characterized in that the reversing valve (10) is a two-position two-way valve.
4. A logic control valve according to claim 1, characterized in that the pilot operated directional control valve (11) is a two-position three-way valve.
5. A logic control valve according to claim 1, characterized in that the electromagnetic directional valve (12) is a two-position two-way valve.
6. A hydraulic system, comprising:
the hydraulic control system comprises a power source I (1), a logic control valve (3), an execution valve (4), a one-way valve (6), an overflow valve (7), a power source II (8) and a hydraulic oil tank (9);
a confluence port EF of the logic control valve (3) is communicated with an oil outlet of the power source I (1), a signal port Ls2 of the logic control valve (3) is connected with a signal port X of the power source I (1), and an oil return port T of the logic control valve (3) is connected with a hydraulic oil tank (9); a signal port Ls3 of the logic control valve (3) is connected with one pilot control end of the overflow valve (7), an oil outlet A of the logic control valve (3) is connected with an oil inlet P of the execution valve (4), and a signal port Ls1 of the logic control valve (3) are respectively connected with pilot pressures at two ends of the execution valve (4);
one path of an oil outlet of the power source II (8) is connected with an oil inlet P of the execution valve (4) through a one-way valve (6), the other path of the oil outlet is connected with a front cavity of the overflow valve (7), and the other path of the oil outlet is connected with the other pilot control end of the overflow valve (7);
working ports at two ends of the execution valve (4) are used for being connected with an execution mechanism to control the action of the execution mechanism;
the logic control valve (3) comprises: the reversing valve (10), the hydraulic control reversing valve (11), the electromagnetic reversing valve (12) and the shuttle valve (13);
the signal port Ls and the signal port Ls1 are respectively connected with two oil inlets of the shuttle valve (13), and an oil outlet of the shuttle valve (13) is communicated with an oil port n of the electromagnetic directional valve (12); one path of an oil port m of the electromagnetic directional valve (12) is connected to a control end of the hydraulic control directional valve (11), and the other path is connected with a signal port Ls 3;
an oil port g of the hydraulic control reversing valve (11) is connected with an oil port m of the electromagnetic reversing valve (12), an oil port e of the hydraulic control reversing valve (11) is connected with a pilot control end of the reversing valve (10), and an oil port f of the hydraulic control reversing valve (11) is connected with a signal port Ls 2;
an oil port c of the reversing valve (10) is connected with a confluence port EF, an oil port d of the reversing valve (10) is connected with an oil outlet A, and a spring cavity of the reversing valve (10) is connected with an oil return port T; the oil path between the oil outlet A and the oil outlet d and the oil path between the oil outlet f and the signal port Ls2 are intersected and communicated.
7. A hydraulic system according to claim 6, characterized in that the directional control valve (10) is a proportional directional control valve.
8. A hydraulic system as claimed in claim 6, characterized in that the directional control valve (10) is a two-position two-way valve, the pilot operated directional control valve (11) is a two-position three-way valve and the electromagnetic directional control valve (12) is a two-position two-way valve.
9. A hydraulic system as claimed in claim 6, characterized in that the first power source (1) is a variable displacement pump and the second power source (8) is a fixed displacement pump.
10. The hydraulic system of claim 6, wherein the actuator is any one of a boom, a dump bucket, a clamping device, a snow removal device, a coal shovel, a grass grasping implement, and a lifting device.
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| CN113090599A (en) | 2021-07-09 |
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