CN117404362A - Hydraulic oil return system and excavator - Google Patents
Hydraulic oil return system and excavator Download PDFInfo
- Publication number
- CN117404362A CN117404362A CN202311724428.6A CN202311724428A CN117404362A CN 117404362 A CN117404362 A CN 117404362A CN 202311724428 A CN202311724428 A CN 202311724428A CN 117404362 A CN117404362 A CN 117404362A
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- 239000010720 hydraulic oil Substances 0.000 title claims abstract description 47
- 239000003921 oil Substances 0.000 claims abstract description 395
- 238000004891 communication Methods 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 description 15
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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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
- F15B13/027—Check valves
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
-
- 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
-
- 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The application relates to the technical field of hydraulic circuits and discloses a hydraulic oil return system and an excavator, wherein the hydraulic oil return system comprises a hydraulic main multi-way valve group, a first one-way valve group, a second one-way valve group, a pressure oil source, an electric control valve assembly and an electric control valve oil return point. The hydraulic main multi-way valve group comprises a main oil inlet channel and a main oil return channel, wherein an oil inlet of the main oil inlet channel is communicated with the oil tank and used for respectively supplying oil to the plurality of actuators, an oil outlet of the main oil inlet channel is communicated with an oil inlet of the main oil return channel, and an oil outlet of the main oil return channel is respectively communicated with the first one-way valve group and the second one-way valve group. The first oil outlet of the electric control valve assembly is communicated with at least one of the first check valve group and the second check valve group, so that the opening degree of the first check valve group and/or the second check valve group can be adjusted through the electric control valve assembly, and the second oil outlet of the electric control valve assembly is communicated with an oil return point of the electric control valve. The hydraulic oil return system disclosed by the application can reduce the energy consumption loss of hydraulic oil return.
Description
Technical Field
The application relates to the technical field of hydraulic circuits, in particular to a hydraulic oil return system and an excavator.
Background
In the working process of the excavator hydraulic system, in order to ensure that oil can be timely supplemented when a hydraulic motor, an oil cylinder actuator, a hydraulic overflow valve and the like are in negative pressure in working, the hydraulic oil return back pressure is generally established on a hydraulic oil return path. In order to ensure that the oil return amount is sufficient without excessively high oil return overpressure, two oil return check valves are usually provided, the opening pressure values of which are different. In order to ensure that the back pressure of the check valve always exists, a hydraulic oil return path is required to always provide oil pressure for the check valve, so that the back pressure energy consumption of hydraulic oil return is high, and great energy consumption is wasted.
Disclosure of Invention
The application provides a hydraulic oil return system and excavator, can reduce the energy consumption loss of hydraulic oil return.
In a first aspect, the present application provides a hydraulic oil return system, including a hydraulic main multi-way valve set, a first check valve set, a second check valve set, a pressure oil source, an electric control valve assembly, and an electric control valve oil return point;
the hydraulic main multi-way valve group comprises a main oil inlet channel and a main oil return channel, an oil inlet of the main oil inlet channel is communicated with an oil tank and used for respectively supplying oil to a plurality of actuators, an oil outlet of the main oil inlet channel is communicated with an oil inlet of the main oil return channel, and an oil outlet of the main oil return channel is respectively communicated with the first one-way valve group and the second one-way valve group;
the oil inlet of the electric control valve assembly is communicated with the pressure oil source, the first oil outlet of the electric control valve assembly is communicated with at least one of the first check valve group and the second check valve group, the opening degree of the first check valve group and/or the second check valve group is/are adjusted through the electric control valve assembly, and the second oil outlet of the electric control valve assembly is communicated with the oil return point of the electric control valve.
The application provides a hydraulic oil return system through setting up automatically controlled valve subassembly, pressure oil source and automatically controlled valve oil return point, and automatically controlled valve subassembly and at least one intercommunication in first check valve group and the second check valve group. When the opening pressure of the first check valve group and/or the second check valve group is regulated, the electric control valve assembly can be supplied with oil through a pressure oil source, so that the electric control valve assembly can supply oil pressure to the first check valve group and/or the second check valve group, and the opening degree of the first check valve group and/or the second check valve group is regulated. Meanwhile, the electric control valve group can return oil through an oil return point of the electric control valve, and normal use of the first one-way valve group and/or the second one-way valve group is not affected. Therefore, the hydraulic oil return system in the application utilizes the electric control valve assembly to adjust the opening degree of the first one-way valve group and/or the second one-way valve group, and omits the work of utilizing the hydraulic main multi-way valve group to provide back pressure for the first one-way valve group and the second one-way valve group, thereby reducing the back pressure energy consumption of the hydraulic oil return system and effectively avoiding energy consumption waste.
In some possible embodiments, the electrically controlled valve assembly includes a first electrically controlled valve block in communication with the first one-way valve block and a second electrically controlled valve block in communication with the second one-way valve block.
In some possible embodiments, the first electrically controlled valve block includes a first electrically controlled valve that is an electro-proportional pressure reducing valve or an electromagnetic on-off valve.
In some possible embodiments, the second electrically controlled valve block includes a second electrically controlled valve that is an electro-proportional pressure reducing valve or an electromagnetic on-off valve.
In some possible embodiments, the main oil inlet includes a first oil inlet and a second oil inlet, and the main oil return includes a first oil return and a second oil return;
the oil outlet of the first oil inlet channel is communicated with the oil inlet of the first oil return channel, the oil outlet of the second oil inlet channel is communicated with the oil inlet of the second oil return channel, the oil outlet of the second oil return channel is communicated with the oil inlet of the first oil return channel, and the oil outlet of the first oil return channel is respectively communicated with the first check valve group and the second check valve group.
In some possible embodiments, the hydraulic control system further comprises a first pressure sensor, wherein the pressure sensor is arranged on the first oil return path or the second oil return path, and the first pressure sensor is used for detecting the oil pressure of the first oil return path or the second oil return path.
In some possible embodiments, the main oil inlet includes a first oil inlet and a second oil inlet, and the main oil return includes a first oil return and a second oil return;
an oil outlet of the first oil inlet channel is communicated with an oil inlet of the first oil return channel, and an oil outlet of the first oil return channel is communicated with the first check valve group;
an oil outlet of the second oil inlet channel is communicated with an oil inlet of the second oil return channel, and an oil outlet of the second oil return channel is communicated with the second check valve group.
In some possible embodiments, further comprising a second pressure sensor and a third pressure sensor;
the second pressure sensor is arranged on the first oil return path and is used for detecting the oil pressure of the first oil return path;
the third pressure sensor is arranged on the second oil return path and is used for detecting the oil pressure of the second oil return path.
In some possible embodiments, the first check valve set is detachably connected to the hydraulic main multiplex valve set, and/or the second check valve set is detachably connected to the hydraulic main multiplex valve set.
In some possible embodiments, the electrically controlled valve assembly is detachably connected to the hydraulic main multiplex valve block.
In a second aspect, the present application provides an excavator comprising a hydraulic oil return system configured as the hydraulic oil return system described in any one of the possible embodiments of the first aspect.
Drawings
FIG. 1 is a schematic diagram of a hydraulic oil return system according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a hydraulic oil return system according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a hydraulic oil return system according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of a hydraulic oil return system according to an embodiment of the present disclosure;
fig. 5 is a schematic view of another structure of the hydraulic oil return system in the embodiment of the present application.
In the figure:
100-a hydraulic main multi-way valve group; 101-a main control valve; 110-main oil inlet path; 111-a first oil inlet path; 112-a second oil inlet path; 120-main oil return path; 121-a first oil return path; 1211-a first distribution oil passage; 1212-a second distribution oil path; 122-a second oil return; 200-a first check valve group; 210-a first one-way valve; 220-a first one-way valve oil way; 300-a second one-way valve group; 310-a second one-way valve; 320-a second one-way valve oil way; 400-a first electric control valve group; 410-a first electrically controlled valve; 420-a first oil inlet pipeline; 430-a first oil outlet line; 500-a second electric control valve group; 510-a second electrically controlled valve; 520-a second oil inlet pipeline; 530-a second oil outlet line; 600-pressure oil source pipeline; 700-an electric control valve oil return path; 800-a first test oil way; 910-a second test oil path; 920-a third test oil path; pi-a source of pressure oil; t-electric control valve oil return point.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the hydraulic oil return system in the embodiment of the present application includes a hydraulic main multi-way valve group 100, a first check valve group 200, a second check valve group 300, a pressure oil source Pi, an electric control valve assembly (refer to 400 and 500 in fig. 1), and an electric control valve oil return point T, where the hydraulic main multi-way valve group 100 is used to supply oil to a plurality of actuators respectively, so that each actuator can complete an action. The plurality of actuators include, but are not limited to, those used to implement excavator walks, boom, bucket, swing and stick, assist operations, and the like.
Each actuator comprises a main control valve 101, an oil inlet chamber (not shown) and an oil return chamber (not shown), which are in communication with the main control valve 101, respectively. The hydraulic main multi-way valve group 100 comprises a main oil inlet path 110 and a main oil return path 120, wherein an oil inlet of the main oil inlet path 110 is communicated with an oil tank, and the oil tank can provide oil for the main oil inlet path 110, so that the main oil inlet path 110 can supply oil for each actuator, and each actuator is ensured to finish action. After the valve core of the main control valve 101 receives the oil in the main oil inlet path 110, the oil flows into the oil inlet cavity to ensure that the actuator completes the action, after the actuator completes the action, the oil enters the valve core of the main control valve 101 from the oil return cavity, and finally returns to the main oil inlet path 110 from the valve core. The oil outlet of the main oil inlet passage 110 is communicated with the main oil return passage 120, and the oil outlet of the main oil return passage 120 is respectively communicated with the first check valve set 200 and the second check valve set 300, so that the oil is recovered after passing through the main oil return passage 120, the first check valve set 200 and the second check valve set 300.
The electric control valve assembly is communicated with at least one of the first check valve assembly 200 and the second check valve assembly 300, specifically, the electric control valve assembly is provided with an oil inlet, a first oil outlet and a second oil outlet, the oil inlet of the electric control valve assembly is communicated with a pressure oil source Pi, the pressure oil source Pi provides oil for the electric control valve assembly, the oil flows to the first check valve assembly 200 and/or the second check valve assembly 300 from the first oil outlet of the electric control valve assembly after being regulated by the electric control valve assembly, and at the moment, the opening degree of the first check valve assembly 200 and/or the second check valve assembly 300 can be regulated by controlling the oil pressure after passing through the electric control valve assembly, so that the pressure value of the main oil return channel 120 can be effectively controlled. In addition, the second oil outlet of the electric control valve assembly is communicated with an oil return point T of the electric control valve, so that oil in the electric control valve assembly is recovered, and normal use of the electric control valve assembly is ensured.
It should be appreciated that, in the hydraulic oil return system in this embodiment, by providing an independent electric control valve assembly, the opening degree of the first check valve set 200 and/or the second check valve set 300 is adjusted by using the electric control valve assembly, so that the work of providing back pressure to the first check valve set 200 and the second check valve set 300 by using the hydraulic main multi-way valve set 100 is omitted, thereby reducing the back pressure energy consumption of the hydraulic oil return system and effectively avoiding energy consumption waste.
In some embodiments, with continued reference to fig. 1, the main oil inlet passage 110 in this embodiment includes a first oil inlet passage 111 and a second oil inlet passage 112, and an oil inlet of the first oil inlet passage 111 and an oil inlet of the second oil inlet passage 112 may be respectively communicated with an oil tank, and the first oil inlet passage 111 and the second oil inlet passage 112 are respectively used for supplying oil to the two groups of actuators. The main oil return path 120 includes a first oil return path 121 and a second oil return path 122, wherein an oil inlet of the first oil return path 121 is communicated with an oil outlet of the first oil inlet path 111, an oil inlet of the second oil return path 122 is communicated with an oil outlet of the second oil inlet path 112, and simultaneously, an oil outlet of the second oil return path 122 is communicated with an oil inlet of the first oil return path 121, and an oil outlet of the first oil return path 121 can be respectively communicated with the first check valve set 200 and the second check valve set 300 through a first distribution oil path 1211 and a second distribution oil path 1212. That is, in the present embodiment, the first oil inlet passage 111 and the second oil inlet passage 112 are in an independent oil inlet mode, but during oil return, the two oil passages are merged into the first oil return passage 121, and the first oil return passage 121 distributes oil to the first check valve group 200 and the second check valve group 300.
With continued reference to fig. 1, the electronic control valve assembly includes a first electronic control valve group 400 and a second electronic control valve group 500, and the first electronic control valve group 400 and the second electronic control valve group 500 can both control the on-off or opening size of the electronic control valves by adjusting current or voltage. Specifically, the first oil outlet of the first electric control valve bank 400 communicates with the first check valve bank 200, and the first oil outlet of the second electric control valve bank 500 communicates with the second check valve bank 300. In addition, a pressure oil source pipeline 600 and an electric control valve oil return pipeline 700 can be further arranged, the pressure oil source pipeline 600 is communicated with the pressure oil source Pi, an oil inlet of the first electric control valve group 400 and an oil inlet of the second electric control valve group 500 are respectively communicated with the pressure oil source pipeline 600, the electric control valve oil return pipeline 700 is communicated with an electric control valve oil return point T, and a second oil outlet of the first electric control valve group 400 and a second oil outlet of the second electric control valve group 500 are respectively communicated with the electric control valve oil return pipeline 700.
In this embodiment, the first electric control valve group 400 includes a first electric control valve 410, a first oil inlet pipe 420 and a first oil outlet pipe 430, wherein an oil inlet of the first electric control valve 410 is communicated with the pressure oil source pipe 600 through the first oil inlet pipe 420, and a second oil outlet of the first electric control valve 410 is communicated with the electric control valve oil return pipe 700 through the first oil outlet pipe 430. Similarly, the second electric control valve group 500 comprises a second electric control valve 510, a second oil inlet pipeline 520 and a second oil outlet pipeline 530, wherein an oil inlet of the second electric control valve 510 is communicated with the pressure oil source pipeline 600 through the second oil inlet pipeline 520, and a second oil outlet of the second electric control valve 510 is communicated with the electric control valve oil return pipeline 700 through the second oil outlet pipeline 530.
Further, the first check valve set 200 includes a first check valve 210 and a first check valve oil path 220, and the first check valve 210 communicates with the first oil outlet of the first electronic control valve 410 through the first check valve oil path 220. Similarly, second check valve set 300 includes a second check valve 310 and a second check valve oil path 320, second check valve 310 communicating with a second oil outlet of second electronic control valve 510 through second check valve oil path 320.
In particular, the first check valve set 200 and the first electric control valve set 400 may be disposed on the same side, and the second check valve set 300 and the second electric control valve set 500 may be disposed on the same side, so as to facilitate connection between each check valve set and the corresponding electric control valve set. In addition, the first check valve set 200, the second check valve set 300, the first electric control valve set 400 and the second electric control valve set 500 can be respectively detachably connected with the hydraulic main multi-way valve set 100 as independent modules, and each module can be fixed with the hydraulic main multi-way valve set 100 by means of screws or threaded insertion, so that different modules can be replaced according to different requirements during later maintenance.
Alternatively, the first check valve set 200 and the first electric control valve set 400 may be detachably connected to the hydraulic main multiplex valve set 100 as a whole. Likewise, the second check valve set 300 and the second electric control valve set 500 are detachably connected to the hydraulic main multiplex valve set 100 as a whole. In addition, the pressure oil source pipeline 600 and the electric control valve oil return circuit 700 serve as external pipelines and can be detachably connected with the hydraulic main multi-way valve group 100 independently, so that later maintenance can be conveniently realized.
With continued reference to fig. 1, the hydraulic oil return system in this embodiment may further include a first pressure sensor (not shown in the drawing) for detecting the pressure of the main oil return path 120, and the operator may determine the operating state of the excavator and the magnitude of the return oil pressure according to the pressure value detected by the first pressure sensor, so as to determine the back pressure value of the hydraulic circuit, thereby controlling the adjustment of the oil path pressures of the first and second electric control valves 410 and 510 to the first and second check valve oil paths 220 and 320 according to the back pressure value of the hydraulic circuit. Through adopting pressure sensor and automatically controlled valve's form, can match with hydraulic pressure owner multichannel valves 100 better in performance and quality, can adjust the oil pressure of first check valve group 200 and second check valve group 300 according to the back pressure value of real-time hydraulic circuit, further reduce the waste of energy consumption, promoted energy-conserving effect.
In the present embodiment, since the first oil return path 121 and the second oil return path 122 are communicated, the oil pressure of the first oil return path 121 and the second oil return path 122 is the same, and the oil pressure of the main oil return path 120 is the same as the oil pressure of the first oil return path 121 or the second oil return path 122, the first pressure sensor may be provided to the first oil return path 121 or the second oil return path 122, so as to detect the oil pressure of the main oil return path 120. Alternatively, as shown in fig. 1, the first test oil path 800 may be externally connected, and one end of the first test oil path 800 may be communicated with the oil outlet of the second oil return path 122, where the oil pressure of the first test oil path 800 is the same as the oil pressures of the first oil return path 121 and the second oil return path 122, and the first pressure sensor is disposed in the first test oil path 800, so that the oil pressure of the main oil return path 120 may also be accurately obtained. And, the form of installing the first pressure sensor by adopting the external first test oil way 800 is convenient for the disassembly and assembly of the first pressure sensor.
In some embodiments, the first electrically controlled valve 410 may be an electro-proportional pressure reducing valve or an electromagnetic on-off valve, and the second electrically controlled valve 510 may be an electro-proportional pressure reducing valve or an electromagnetic on-off valve. For example, when the first electrically controlled valve 410 and the second electrically controlled valve 510 are both electrically proportional pressure reducing valves, the hydraulic oil return system in the present embodiment may refer to the structure shown in fig. 1. When the first electrically controlled valve 410 and the second electrically controlled valve 510 are both electromagnetic switch valves, the hydraulic oil return system in this embodiment may refer to the structure shown in fig. 2. When one of the first electric control valve 410 and the second electric control valve 510 is an electric proportional pressure reducing valve and the other is an electromagnetic switch valve, the hydraulic oil return system in this embodiment may refer to the structure shown in fig. 3. It should be noted that the structures of the hydraulic oil return systems in fig. 2 and 3 are the same as those of the other valve groups except that the types of the first electrically controlled valve 410 and the second electrically controlled valve 510 are different from those of fig. 1.
In some embodiments, referring to fig. 4, the connection forms of the first and second electric control valve blocks 400 and 500 and the hydraulic main multiplex valve block 100 and the first and second check valve blocks 200 and 300 in this embodiment are the same as those in fig. 1, and will not be described here. The main oil inlet path 110 in this embodiment includes a first oil inlet path 111 and a second oil inlet path 112, and an oil inlet of the first oil inlet path 111 and an oil inlet of the second oil inlet path 112 may be respectively communicated with an oil tank, and the first oil inlet path 111 and the second oil inlet path 112 are respectively used for supplying oil to two groups of actuators. The main oil return path 120 comprises a first oil return path 121 and a second oil return path 122, wherein an oil inlet of the first oil return path 121 is communicated with an outlet of the first oil inlet path 111, an oil outlet of the first oil return path 121 is communicated with the first check valve set 200, an oil inlet of the second oil return path 122 is communicated with an outlet of the second oil inlet path 112, and an oil outlet of the second oil return path 122 is communicated with the second check valve set 300. That is, the two oil inlets and the two oil returns in the present embodiment are independent from each other, and the first check valve set 200 and the second check valve set 300 can be independently controlled by the first electric control valve set 400 and the second electric control valve set 500, respectively.
In the present embodiment, the hydraulic oil return system may be provided with a second pressure sensor (not shown in the drawings) provided to the first oil return path 121 for detecting the oil pressure of the first oil return path 121, and a third pressure sensor (not shown in the drawings) provided to the second oil return path 122 for detecting the oil pressure of the second oil return path 122. Specifically, the first electronic control valve 410 controls the oil pressure of the first check valve oil passage 220 through the oil pressure of the first oil return passage 121 detected by the second pressure sensor, thereby adjusting the opening degree of the first check valve 210. Similarly, the second electric control valve 510 controls the oil pressure of the second check valve oil passage 320 by the oil pressure of the second oil return passage 122 detected by the third pressure sensor, thereby adjusting the opening degree of the second check valve 310.
In particular, with continued reference to fig. 4, the second pressure sensor may be disposed in the first oil return path 121, or may be externally connected to the second test oil path 910, where the second pressure sensor is disposed in the second test oil path 910. The second test oil path 910 is communicated with the oil inlet of the first oil return path 121, so that the oil pressures of the second test oil path 910 and the first oil return path 121 are the same, and an operator can obtain the accurate oil pressure of the first oil return path 121. Moreover, through the external connection of the second test oil way 910, the oil pressure of the first oil return way 121 can be conveniently detected at any time by an operator, and the detection equipment can be replaced at any time, so that the detection and the installation of the operator are more convenient. Similarly, the third pressure sensor may be disposed in the second oil return path 122, or may be disposed in the third test oil path 920 by externally connecting to the third test oil path 920.
In some embodiments, when the electrically controlled valve assembly includes only the first electrically controlled valve block 400, the first electrically controlled valve block 400 communicates with one of the first and second check valve blocks 200 and 300. Taking fig. 5 as an example, the first electric control valve set 400 is communicated with the first check valve set 200, and in this case, the hydraulic oil return system in the present embodiment only reduces the structure of the second electric control valve set 500 compared with that in fig. 1. Therefore, it can be seen that in the hydraulic oil return system in this embodiment, each electric control valve group and each check valve group are detachably connected with the hydraulic main multi-way valve group 100 as separate modules, and each module does not affect the normal use of other modules when being disassembled and assembled.
Based on the same inventive concept, the present application may also provide an excavator, which may include a hydraulic oil return system as described in any one of the embodiments above. It can be appreciated that the excavator in the application adopts the hydraulic oil return system in any embodiment of the application, and can reduce energy consumption loss while ensuring the safe work of each actuator.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The hydraulic oil return system is characterized by comprising a hydraulic main multi-way valve group, a first one-way valve group, a second one-way valve group, a pressure oil source, an electric control valve assembly and an electric control valve oil return point;
the hydraulic main multi-way valve group comprises a main oil inlet channel and a main oil return channel, an oil inlet of the main oil inlet channel is communicated with an oil tank and used for respectively supplying oil to a plurality of actuators, an oil outlet of the main oil inlet channel is communicated with an oil inlet of the main oil return channel, and an oil outlet of the main oil return channel is respectively communicated with the first one-way valve group and the second one-way valve group;
the oil inlet of the electric control valve assembly is communicated with the pressure oil source, the first oil outlet of the electric control valve assembly is communicated with at least one of the first check valve group and the second check valve group, the opening degree of the first check valve group and/or the second check valve group is/are adjusted through the electric control valve assembly, and the second oil outlet of the electric control valve assembly is communicated with the oil return point of the electric control valve.
2. The hydraulic oil return system of claim 1, wherein the electrically controlled valve assembly includes a first electrically controlled valve block in communication with the first one-way valve block and a second electrically controlled valve block in communication with the second one-way valve block.
3. The hydraulic oil return system of claim 2, wherein the first electrically controlled valve block comprises a first electrically controlled valve, the first electrically controlled valve being an electro-proportional pressure reducing valve or an electromagnetic switch valve;
the second electric control valve group comprises a second electric control valve, and the second electric control valve is an electric proportional pressure reducing valve or an electromagnetic switch valve.
4. The hydraulic oil return system of claim 1, wherein the main oil inlet includes a first oil inlet and a second oil inlet, and the main oil return includes a first oil return and a second oil return;
the oil outlet of the first oil inlet channel is communicated with the oil inlet of the first oil return channel, the oil outlet of the second oil inlet channel is communicated with the oil inlet of the second oil return channel, the oil outlet of the second oil return channel is communicated with the oil inlet of the first oil return channel, and the oil outlet of the first oil return channel is respectively communicated with the first check valve group and the second check valve group.
5. The hydraulic oil return system of claim 4, further comprising a first pressure sensor disposed in the first oil return or the second oil return, the first pressure sensor configured to detect an oil pressure of the first oil return or the second oil return.
6. The hydraulic oil return system of claim 1, wherein the main oil inlet includes a first oil inlet and a second oil inlet, and the main oil return includes a first oil return and a second oil return;
an oil outlet of the first oil inlet channel is communicated with an oil inlet of the first oil return channel, and an oil outlet of the first oil return channel is communicated with the first check valve group;
an oil outlet of the second oil inlet channel is communicated with an oil inlet of the second oil return channel, and an oil outlet of the second oil return channel is communicated with the second check valve group.
7. The hydraulic oil return system of claim 6, further comprising a second pressure sensor and a third pressure sensor;
the second pressure sensor is arranged on the first oil return path and is used for detecting the oil pressure of the first oil return path;
the third pressure sensor is arranged on the second oil return path and is used for detecting the oil pressure of the second oil return path.
8. The hydraulic oil return system of claim 1, wherein the first check valve set is detachably connected to the hydraulic main multiplex valve set and/or the second check valve set is detachably connected to the hydraulic main multiplex valve set.
9. The hydraulic oil return system of claim 1, wherein the electrically controlled valve assembly is detachably connected to the hydraulic main multiplex valve block.
10. An excavator comprising a hydraulic oil return system configured as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN101598152A (en) * | 2009-06-18 | 2009-12-09 | 卢宇 | Large-flow compact type bi-directional rotary control valve |
| CN103244496A (en) * | 2013-05-13 | 2013-08-14 | 三一汽车起重机械有限公司 | Rotary control valve unit, rotary control hydraulic system and crane |
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| CN117404362B (en) | 2024-03-15 |
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