CN110486341B - Hydraulic control system and mobile working equipment - Google Patents
Hydraulic control system and mobile working equipment Download PDFInfo
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- CN110486341B CN110486341B CN201810454362.6A CN201810454362A CN110486341B CN 110486341 B CN110486341 B CN 110486341B CN 201810454362 A CN201810454362 A CN 201810454362A CN 110486341 B CN110486341 B CN 110486341B
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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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more 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
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The application provides a hydraulic control system and a mobile working device. The hydraulic control system includes: a hydraulic actuator unit having a first hydraulic actuator for performing a first operation and a second hydraulic actuator for performing a second operation; a pilot valve fluidly coupled with the hydraulic implement unit to control the first operation and the second operation; and a switching unit having an inlet fluidly coupled to the pilot valve and an outlet fluidly coupled to the hydraulic actuator unit, the switching unit being adapted to cause an inlet pressure of the switching unit to be changed to an outlet pressure, which is a predetermined pilot pressure, through the switching unit when the hydraulic control system is switched from the first operation or the second operation to a compound operation made up of the first operation and the second operation.
Description
Technical Field
The invention relates to a hydraulic control system and a corresponding mobile operating device.
Background
Compared with other types of transmission devices such as mechanical transmission devices, the hydraulic transmission device has the advantages of small volume, light weight, sensitive action, capability of realizing frequent starting and reversing, simplicity in operation, easiness in control and the like. Therefore, it is widely used in many mechanical devices.
In road surface machines such as loaders, excavators and forklifts, the hydraulic control system has obvious advantages. Within such work machines, it is often necessary for two or more actuators (e.g., motors, cylinders, etc.) to act together to achieve a compound action. Such a hydraulic control system is used, for example, for a boom of a loader in order to achieve a compound action of the boom such as turning or the like.
In the existing hydraulic control system, a main valve, for example, a throttle valve is generally provided below each hydraulic actuator, and the opening area of the spool of the main valve is adjusted by pulling an operating handle by an operator, thereby controlling the operation of the hydraulic actuator. However, even if the operator adjusts the opening areas of the main valves to be equal by pulling the handle, the hydraulic fluid flows toward the low-pressure side due to the difference in the load of each hydraulic actuator (for example, the load of the cylinder), and thus a compound action in which two or more actuators operate together cannot be achieved.
In the prior art, in order to solve the above-mentioned problem, one solution is to provide a pressure compensator before or after each main valve, respectively, so that the distribution of the hydraulic fluid to the hydraulic actuators depends only on the opening area of the spool and no longer on the load. In this way, the operator adjusts the opening area of the spool to achieve compound action of two or more actuators. However, this solution requires the addition of several pressure compensators, thereby increasing the complexity and cost of the hydraulic control system.
Accordingly, there is a need for an improved hydraulic control system that overcomes the problems in the prior art.
Disclosure of Invention
The invention aims to provide a hydraulic control system which is efficient, reliable and simple in structure and corresponding mobile working equipment.
According to a first aspect of the present invention, there is provided a hydraulic control system comprising: a hydraulic actuator unit having a first hydraulic actuator for performing a first operation and a second hydraulic actuator for performing a second operation; a pilot valve that generates a control signal to control the first operation and the second operation; and a switch unit having a first flow path fluidly coupled to the first hydraulic actuator and a second flow path fluidly coupled to the second hydraulic actuator, the switch unit being adapted to adjust a pressure of one of the first and second flow paths by adjusting a pressure of the other of the first and second flow paths under control of the control signal when the hydraulic control system is configured to perform a composite operation made up of the first and second operations.
According to an alternative embodiment, the hydraulic control system further comprises a hydraulic working unit. The hydraulic working unit has: a first main valve fluidly coupled between the pilot valve and the first hydraulic actuator, the pilot valve controlling a first operation of the first hydraulic actuator by adjusting the first main valve; and a second main valve fluidly coupled between the pilot valve and the second hydraulic actuator, the pilot valve controlling a second operation of the second hydraulic actuator by adjusting the second main valve.
According to an alternative embodiment, the first flow path defines a first input port and a first output port of the switch unit. The first input port is coupled with a first control port of the pilot valve, and the first output port is coupled with a one-side pilot end of a first main valve of the hydraulic control system. The second flow path defines a second input port and a second output port of the switch unit. The second input port is coupled with a second control port of the pilot valve, and the second output port is coupled with a one-side pilot end of a second main valve of the hydraulic control system.
According to an alternative embodiment, one side pilot end of the first main valve is fluidly coupled with the first output port of the switching unit, and the other side pilot end of the first main valve is fluidly coupled with the third control port of the pilot valve. One side pilot end of the second main valve is fluidly coupled with the second output port of the switching unit, and the other side pilot end of the second main valve is fluidly coupled with a fourth control port of the pilot valve.
According to an alternative embodiment, the switching unit comprises: a first throttle valve having an inlet fluidly coupled to the first control port of the pilot valve and an outlet fluidly coupled to the one side pilot end of the first main valve; a second throttle having an inlet fluidly coupled to an outlet of the first throttle and an outlet fluidly coupled to a tank of the hydraulic control system; and a switch having an inlet port connected to an outlet of the second throttle valve, an outlet port connected to the tank, and a control port connected to a second control port of the pilot valve,
wherein the switch is adapted to open under control of the control signal from the second control port to cause pilot fluid from a pilot fluid source of the hydraulic control system to flow into the tank via the first throttle, the second throttle and the switch, thereby regulating the pressure on the second flow path side by reducing the pressure on the first flow path side of the switch unit.
According to an alternative embodiment, the switch is one of a one-way valve or a hydraulic valve and the control signal is a hydraulic signal from the second control port.
According to an alternative embodiment, the switch is a solenoid valve and the control signal is an electrical signal based on a hydraulic signal from the second control port.
According to an alternative embodiment, the switch is a relief valve configured to open to communicate with the tank upon receipt of a hydraulic signal from the second control port.
According to an alternative embodiment, the switching unit comprises: a pressure reducing valve having an inlet port connected to the first input port of the switching unit, an outlet port connected to the first output port of the switching unit, and a control port connected to the second control port of the pilot valve. The pressure reducing valve is opened under the control of the control signal from the second control port to allow pilot fluid from a pilot fluid source of the hydraulic control system to flow through the pressure reducing valve, thereby regulating the second flow path side pressure by reducing the pressure on the first flow path side of the switching unit.
According to an alternative embodiment, the switching unit comprises: a first throttle valve having an inlet fluidly coupled to the first control port of the pilot valve and an outlet fluidly coupled to the one side pilot end of the first main valve; and the overflow valve is provided with an inlet end connected with the outlet of the first throttling valve, an outlet end connected with the oil tank and a control end connected with the second control port of the pilot valve. The relief valve is adapted to open under control of the control signal from the second control port to cause pilot fluid from a pilot fluid source of the hydraulic control system to flow into the tank via the first throttle valve and the relief valve, thereby adjusting the second flow path side pressure by reducing the pressure on the first flow path side of the opening and closing unit.
According to a second aspect of the present invention, there is provided a mobile working apparatus equipped with the hydraulic control system.
According to an alternative embodiment, the mobile work apparatus is a loader, excavator or forklift.
The hydraulic control system has simple structure and high reliability, and can realize mechanical composite action.
Drawings
The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings comprise:
FIG. 1 illustrates a system block diagram of a hydraulic control system according to an exemplary embodiment of the present invention.
Fig. 2A-2D are schematic diagrams of a switch unit of a hydraulic control system according to various implementations of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and several embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
FIG. 1 shows a block diagram of a hydraulic control system according to an exemplary embodiment of the present invention. As shown in fig. 1, the hydraulic control system 100 mainly includes: the hydraulic actuator unit 110, the pilot valve 120 fluidly coupled to the hydraulic actuator unit 110, and the switching unit 130 fluidly coupled between the hydraulic actuator unit 110 and the pilot valve 120. In fig. 1, the hydraulic actuator unit 110 is shown to include two hydraulic actuators, namely, a first hydraulic actuator 111 and a second hydraulic actuator 112. The first hydraulic actuator 111 performs a first operation under the control of the pilot valve 120. The second hydraulic actuator 112 performs a second operation under the control of the pilot valve 120. The first operation performed by the first hydraulic actuator 111 and the second operation performed by the second hydraulic actuator 112 operate together to constitute a compound action of the machine, for example, a compound action of a road machine such as an excavator. It should be appreciated that hydraulic implement unit 110 may include any number of hydraulic implements greater than two depending on the particular application. These hydraulic actuators act together to achieve a compound action. In fig. 1, the first hydraulic actuator 111 and the second hydraulic actuator 112 are illustrated as hydraulic cylinders, but it should be understood that they may be other types of hydraulic actuators, such as motors, etc. In fig. 1, the second hydraulic actuator 112 is illustrated as two parallel hydraulic cylinders 112A and 112B. It should be appreciated that the first and second hydraulic actuators 111, 112 may be otherwise configured depending on the particular application.
The pilot valve 120 is preferably configured as an operating handle. The operator adjusts the first operation of the hydraulic actuator 111 and the second operation of the hydraulic actuator 112 by adjusting the direction of the operating handle. The pilot valve 120 has a first control port a1, a second control port b2, a third control port b1, and a fourth control port a2 as control ports. Referring to fig. 1, the pilot valve 120 also has a port P that is coupled with a source of pilot fluid (not shown) of the hydraulic control system 100. Thus, the pilot valve 120 receives pilot fluid from the pilot fluid source through port P.
With continued reference to fig. 1, the hydraulic control system 100 further includes a hydraulic work unit 140 that basically includes a first main valve 141 and a second main valve 142. A first main valve 141 is fluidly coupled between the pilot valve 120 and the first hydraulic actuator 111. The pilot valve 120 controls the first operation of the first hydraulic actuator 111 by adjusting the first main valve 141. The second main valve 142 is fluidly coupled between the pilot valve 120 and the second hydraulic actuator 142. The pilot valve 120 controls the second operation of the second hydraulic actuator 112 by adjusting the second main valve 142. The hydraulic working unit 140 has output ports A1, B1, A2, B2, which are connected to the respective hydraulic actuators 111 and 112.
The switching unit 130 is coupled between the pilot valve 120 and the hydraulic working unit 140. As shown in FIG. 1, the opening and closing unit 130 has a first channel (a 1'-a 11') and a second channel (b 2'-b 22'). The first flow path (a 1'-a 11') defines a first input port a1 'and a first output port a11' of the switch unit (130). The second flow path (b 2'-b 22') defines a second input port b2 'and a second output port b22' of the switch unit (130). The first input port a1' is coupled to a first control port a1 of the pilot valve 120. The second input port b2' is coupled with a second control port b2 of the pilot valve 120. The first output port a11' is coupled to a one-side pilot port 141A of the first main valve 141. The second output port b22' is coupled to a one-side pilot end 142A of the second main valve 142.
In the hydraulic control system 100, a pilot fluid (e.g., pilot oil) flows from a pilot fluid source through the switching unit 130 and the one-side pilot end 141A of the first main valve 141 and/or the one-side pilot end 142A of the second main valve 142 of the hydraulic working unit 140 in order via the port P to push the first main valve 141 and/or the second main valve 142, and the pilot pressure of the first main valve 141 and/or the second main valve 142 is adjusted, thereby controlling the operations of the hydraulic actuators 111 and 112.
According to some embodiments of the present invention, as shown in fig. 1, the switching unit 130 includes a first throttle valve 131, a second throttle valve 132, and a check valve 133. The first throttle valve 131 has an inlet fluidly coupled to the first control port a1 of the pilot valve 120, and an outlet fluidly coupled to the one-side pilot port 141A of the first main valve 141. The second choke 132 has an inlet fluidly coupled to the outlet of the first choke 131 and an outlet fluidly coupled to the tank T of the hydraulic control system 100. The check valve 133 has an inlet port connected to the outlet of the second throttle valve 132, an outlet port connected to the tank T, and a control port connected to the second control port b2 of the pilot valve 120.
Hereinafter, a process of performing the combined operation of the hydraulic actuator 110 by adjusting the pilot pressure of the main valve will be described by taking the hydraulic control system 100 and the switch unit 130 thereof of the present invention as an example. In the following exemplary embodiments, it is assumed that the first hydraulic actuator 111 has, for example, a first load and the second hydraulic actuator 112 has, for example, a second load which is greater than the first load. It should be understood that the loads of the first actuator 111 and the second actuator 112 may be other situations, and are not limited thereto.
In some embodiments, first, the first control port a1 of the pilot valve 120 is operated such that the pilot fluid flows through the first input port a1' of the switching unit 130 through the port P, flows to the pilot port 141A of the first main valve 141 through the fluid path (e.g., the first flow path of the switching unit 130) a1' -a11', so as to push the pilot port 141A of the first main valve 141, thereby controlling the first operation of the first hydraulic actuator 111. At this time, only one side of the first hydraulic actuator 111 is actuated, that is, the hydraulic actuator unit 110 performs only the first operation. Next, the second control port b2 of the pilot valve 120 is operated such that the pilot fluid flows to the second input port b2' of the switching unit 130 via the port P. The check valve 133 is opened under the control of the hydraulic signal from the second control port b2, so that the pilot fluid flows into the tank T via the first throttle 131, the second throttle 132, and the check valve 133 in order. Thereby, the outlet pressure of the first output port a11' of the switching unit 130, i.e., the pilot pressure of the pilot port 141A of the first main valve 141, is reduced, for example, to a predetermined pilot pressure. Here, the predetermined pilot pressure of the pilot end 141A of the first main valve 141 may be set according to a desired compound operation of the hydraulic actuators 111, 112 on both sides. Thus, the force on the spool of the first main valve 141 decreases, the distance of movement decreases, the opening area decreases, and the flow rate on the first hydraulic actuator 111 side is adjusted.
Therefore, when a transition is made from a first operation in which only the first hydraulic actuator 111 is performed to a compound operation in which both hydraulic actuators 111, 112 perform operations, the pilot pressure of the main valve is adjusted by the pilot fluid so that both sides of the first actuator 111 and the second actuator 112 are supplied with hydraulic fluid. Further, the flow rates of the both-side hydraulic actuators can be adjusted by setting a predetermined pilot pressure of the main valve, thereby realizing a desired combined operation.
In some embodiments, first, the second control port b2 of the pilot valve 120 is operated to supply the pilot fluid to the second input port b2' of the switching unit 130. At this time, the check valve 133 is opened under the control of the hydraulic signal from the second control port b2, so that the pilot fluid flows into the tank T through the first throttle 131, the second throttle 132, and the check valve 133 in this order. Thereby, the outlet pressure of the first output port a11' of the switching unit 130, i.e., the pilot pressure of the pilot port 141A of the first main valve 141, is reduced, for example, to a predetermined pilot pressure. Here, the predetermined pilot pressure of the pilot end 141A of the first main valve 141 may be set according to a desired compound operation of the hydraulic actuators 111, 112 on both sides. At this time, only one side of the second hydraulic actuator 112 is actuated, that is, the hydraulic actuator unit 110 performs only the second operation. Next, the first control port a1 of the pilot valve 120 is operated to supply the fluid to the first input port a1 'of the switching unit 130, and in a case where the outlet pressure of the first output port a11' has been reduced, the pilot fluid can flow through the fluid paths a1'-a11' of the switching unit 130 and also flow through the fluid paths b2'-b22' of the switching unit 130 (e.g., the second flow path of the switching unit 130), so that both the hydraulic actuators 111 and 112 are supplied with the hydraulic fluid, thereby implementing the complex operation.
Therefore, at the time of switching from the second operation of performing only the second hydraulic actuator 112 to the combined operation of performing both the hydraulic actuators 111, 112, the pilot pressure of the main valve is adjusted by the pilot fluid so that both the first actuator 111 and the second actuator 112 are supplied with the hydraulic fluid. Further, the flow rates of the both-side hydraulic actuators can be adjusted by setting a predetermined pilot pressure of the main valve, thereby realizing a desired combined operation.
As apparent from the above description, the switching unit of the hydraulic control system of the present invention is adapted to be opened under the control of a control signal from the pilot valve so that the pilot fluid flows through the switching unit, so that the inlet pressure of the switching unit is changed at the outlet by the pilot fluid passing through the switching unit, for example, the outlet pressure of the switching unit is changed to a predetermined pilot pressure of the main valve, thereby achieving a composite action of the hydraulic actuating unit. According to the aspect of the present invention, the pilot pressure of the main valve is set to adjust the flow rate of the hydraulic actuator, thereby realizing a desired combined operation of the hydraulic actuator.
It should be understood that in the hydraulic control system of the present invention, the hydraulic actuator unit may include more than two hydraulic actuators, the hydraulic working unit may also include more than two main valves, and the number of the main valves corresponds to the number of the hydraulic actuators. In the case where two or more hydraulic actuators and main valves are included, the arrangement of the pilot valves and the switching units in the hydraulic control system according to the present invention is adaptively changed, and a compound operation in which a plurality of actuators operate together can be similarly realized according to the present invention.
Fig. 2A to 2D are schematic diagrams of modifications of the switching unit 130 in fig. 1. The switch units 130A-130D shown in fig. 2A-2D may all replace the switch unit 130 of fig. 1 to implement the hydraulic control system 100 according to the present invention. Of course, the switch unit 130 of the present invention has other implementations, and is not limited thereto. Hereinafter, the switching units 130A to 130D in fig. 2A to 2D will be described, respectively.
Fig. 2A is a schematic diagram of a switching unit 130A of an exemplary embodiment of the hydraulic control system 100 according to the present invention. The switching unit 130A shown in fig. 2A is different from the switching unit 130 shown in fig. 1 only in that the check valve 133 in fig. 1 is replaced with the solenoid valve 133A shown in fig. 2A. The connection and operation of the switch unit 130A are the same as those of the switch unit 130, and for the sake of clarity, the description is omitted. The control signal of the solenoid valve 133A is an electric signal based on the control signal from the second control port b2 of the pilot valve 120. For example, the second control port b2 of the pilot valve 120 is connected to the control terminal of the solenoid valve 133A through a suitable signal converter, through which the control terminal of the solenoid valve 133A receives the control signal from the pilot valve 120.
Fig. 2B is a schematic diagram of a switching unit 130B of an exemplary embodiment of the hydraulic control system 100 according to the present invention. The opening and closing unit 130B shown in fig. 2B is different from the opening and closing unit 130 shown in fig. 1 only in that the check valve 133 in fig. 1 is replaced with a relief valve 133B shown in fig. 2B. The connection and operation of the switch unit 130B are the same as those of the switch unit 130, and for the sake of clarity, the description thereof is omitted. Note that the relief valve 133B here is a relief valve having a control port. For example, when the control end of the relief valve 133B receives a control signal from the second control port B2 of the pilot valve 120, the inlet pressure of the relief valve 133B is set to 0, that is, the relief valve 133B directly communicates with the tank T.
Fig. 2C shows a modified form 130C of the switch unit 130B in fig. 2B. The switching unit 130C shown in fig. 2C differs from the switching unit 130B shown in fig. 2B only in that the switching unit 130C in fig. 2C has one less throttle valve than the switching unit 130B in fig. 2B, i.e., the switching unit 130C in fig. 2C includes a first throttle valve 131 and a relief valve 133C. It should be understood that in a variant of the switching unit 130C, the switching unit 130C may also omit the first throttle valve 131, i.e. include only the overflow valve 133C. In the switching unit 130C and its modifications, when the control end of the relief valve 133C receives a control signal from the second control port b2 of the pilot valve 120, an inlet pressure value thereof is set, for example, a predetermined pilot pressure or other suitable pressure value of the pilot end 141A of the main valve 141.
Fig. 2D is a schematic diagram of a switching unit 130D of an exemplary embodiment of the hydraulic control system 100 according to the present invention. As shown in fig. 2D, the switching unit 130D includes a pressure reducing valve 133D. The pressure reducing valve 133D has an inlet port connected to the first inlet port a1 'of the switching unit 130D, an outlet port connected to the first outlet port a11' of the switching unit 130D, and a control port connected to the second control port b2 of the pilot valve 120. When the control end of the pressure reducing valve 133D receives the hydraulic signal from the second control port b2, the pressure reducing valve 130D is opened so that the pilot fluid flows through the pressure reducing valve 133D, so that the outlet pressure of the first output port a11' of the switching unit 130D, i.e., the pilot pressure of the pilot end 141A of the first main valve 141, is reduced, for example, to a predetermined pilot pressure value.
As apparent from the above description, the hydraulic control system of the present invention includes an additional switching unit which adjusts a pilot pressure of a main valve of the hydraulic control system in cooperation with a pilot valve (e.g., an operation handle) to adjust a flow rate of a hydraulic actuator, thereby achieving a complex action of a plurality of actuators, and is simple in structure, highly reliable, and easy to operate.
It is obvious to those skilled in the art that the hydraulic control system of the present invention can also be applied to other equipment requiring the hydraulic control system, such as a forklift, an excavator, etc., and is not limited to a loader.
Moreover, other advantages and alternative embodiments of the present invention will be apparent to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, representative structures, and illustrative examples shown and described. On the contrary, various modifications and substitutions may be made by those skilled in the art without departing from the basic spirit and scope of the invention.
Claims (11)
1. A hydraulic control system (100), characterized in that the hydraulic control system (100) comprises:
a hydraulic actuator unit (110) having a first hydraulic actuator (111) for performing a first operation and a second hydraulic actuator (112) for performing a second operation;
a pilot valve (120) that generates a control signal to control the first operation and the second operation; and
a switch unit (130) having a first flow path fluidly coupled to the first hydraulic actuator (111) and a second flow path fluidly coupled to the second hydraulic actuator (112), the switch unit (130) being adapted to adjust a pressure of one of the first and second flow paths by adjusting a pressure of the other of the first and second flow paths under control of the control signal when the hydraulic control system (100) is configured to perform a composite operation made up of the first and second operations,
wherein the first flow path defines a first input port (a 1 ') and a first output port (a 11') of the switch unit (130), the first input port (a 1 ') being coupled with a first control port (a 1) of the pilot valve (120), and the first output port (a 11') being coupled with a one-side pilot end (141A) of a first main valve (141) of the hydraulic control system (100); and is
The second flow path defines a second input port (b 2 ') and a second output port (b 22') of the switch unit (130), the second input port (b 2 ') is coupled with a second control port (b 2) of the pilot valve (120), and the second output port (b 22') is coupled with a one-side pilot end (142A) of a second main valve (142) of the hydraulic control system (100).
2. The hydraulic control system (100) of claim 1, characterized in that the hydraulic control system (100) further comprises a hydraulic work unit (140), the hydraulic work unit (140) having:
a first main valve (141) fluidly coupled between the pilot valve (120) and the first hydraulic actuator (111), the pilot valve (120) controlling a first operation of the first hydraulic actuator (111) by adjusting the first main valve (141); and
a second main valve (142) fluidly coupled between the pilot valve (120) and the second hydraulic actuator (112), the pilot valve (120) controlling a second operation of the second hydraulic actuator (112) by adjusting the second main valve (142).
3. The hydraulic control system (100) of claim 2,
one side pilot end (141A) of the first main valve (141) is fluidly coupled with a first output port (a 11') of the switching unit (130), and the other side pilot end of the first main valve is fluidly coupled with a third control port (b 1) of the pilot valve (120);
one side pilot end (142A) of the second main valve (142) is fluidly coupled with the second output port (b 22') of the switching unit (130), and the other side pilot end of the second main valve (142) is fluidly coupled with the fourth control port (a 2) of the pilot valve (120).
4. The hydraulic control system (100) of claim 2, wherein the switch unit (130) comprises:
a first throttle valve (131) having an inlet fluidly coupled to a first control port (a 1) of the pilot valve (120) and an outlet fluidly coupled to a one-side pilot end (141A) of the first main valve (141);
a second throttle (132) having an inlet fluidly coupled to an outlet of the first throttle (131) and an outlet fluidly coupled to a tank (T) of the hydraulic control system (100); and
a switch (133) having an inlet end connected to the outlet of the second throttle valve (132), an outlet end connected to the tank (T), and a control end connected to the second control port of the pilot valve (120),
wherein the switch (133) is adapted to open under control of the control signal from the second control port (b 2) such that pilot fluid from a pilot fluid source of the hydraulic control system (100) flows into the tank (T) via the first throttle (131), the second throttle (132) and the switch (133) to adjust the pressure on the second flow path side by reducing the pressure on the first flow path side of the switch unit (130).
5. The hydraulic control system (100) of claim 4, wherein the switch (133) is one of a check valve or a hydraulic valve and the control signal is a hydraulic signal from the second control port (b 2).
6. The hydraulic control system (100) of claim 4, wherein the switch (133) is a solenoid valve (133A), and the control signal is an electrical signal based on the hydraulic signal from the second control port (b 2).
7. The hydraulic control system (100) of claim 4, wherein the switch (133) is a spill valve (133B), the spill valve (133B) being configured to open to communicate with the tank (T) upon receiving a control signal from the second control port (B2).
8. The hydraulic control system (100) of claim 4, wherein the switch unit (130) comprises:
a pressure reducing valve (133D) having an inlet end connected to the first input port (a 1 ') of the switching unit (130), an outlet end connected to the first output port (a 11') of the switching unit (130), and a control end connected to the second control port (b 2) of the pilot valve (120),
wherein the pressure reducing valve (133D) is opened under control of the control signal from the second control port (b 2) to allow pilot fluid from a pilot fluid source of the hydraulic control system (100) to flow through the pressure reducing valve (133D), thereby adjusting the pressure on the second flow path side by reducing the pressure on the first flow path side of the switching unit (130D).
9. The hydraulic control system (100) of claim 4, wherein the switch unit (130) comprises:
a first throttle valve (131) having an inlet fluidly coupled to a first control port (a 1) of the pilot valve (120) and an outlet fluidly coupled to a one-side pilot end (141 AA) of the first main valve (141); and
a relief valve (133C) having an inlet end connected to an outlet of the first throttle valve (131), an outlet end connected to the tank (T), and a control end connected to a second control port (b 2) of the pilot valve (120),
wherein the relief valve (133C) is adapted to open under control of the control signal from the second control port (b 2) such that pilot fluid from a pilot fluid source of the hydraulic control system (100) flows into the tank (T) via the first throttle (131) and the relief valve (133C), thereby adjusting the pressure on the second flow path side by reducing the pressure on the first flow path side of the switching unit (130C).
10. A mobile working machine, characterized in that it is equipped with a hydraulic control system (100) according to any one of claims 1-9.
11. The mobile work apparatus of claim 10, wherein the mobile work apparatus is a loader, excavator or forklift.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810454362.6A CN110486341B (en) | 2018-05-14 | 2018-05-14 | Hydraulic control system and mobile working equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810454362.6A CN110486341B (en) | 2018-05-14 | 2018-05-14 | Hydraulic control system and mobile working equipment |
Publications (2)
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