CN219639191U - Hydraulic unloading control system and loader - Google Patents
Hydraulic unloading control system and loader Download PDFInfo
- Publication number
- CN219639191U CN219639191U CN202320275815.5U CN202320275815U CN219639191U CN 219639191 U CN219639191 U CN 219639191U CN 202320275815 U CN202320275815 U CN 202320275815U CN 219639191 U CN219639191 U CN 219639191U
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- unloading
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- cooler
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- 238000004891 communication Methods 0.000 claims abstract description 6
- 238000013016 damping Methods 0.000 claims description 14
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 80
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Fluid-Pressure Circuits (AREA)
Abstract
The utility model provides a hydraulic unloading control system and a loader, wherein the hydraulic unloading control system comprises: a priority valve in communication with the first hydraulic pump; the input end of the unloading valve is communicated with the first output end of the priority valve; the oil inlet of the electromagnetic reversing valve is communicated with the first output end of the unloading valve, the oil outlet of the electromagnetic reversing valve is connected with the input end of the cooler, and the output end of the cooler is connected with the oil tank. According to the scheme, the electromagnetic reversing valve is additionally arranged between the unloading valve and the cooler, so that the electromagnetic reversing valve can reduce the oil pressure flowing out of the unloading valve and entering the cooler, and the service life of the cooler is prolonged.
Description
Technical Field
The utility model relates to the technical field of machinery, in particular to a hydraulic unloading control system and a loader.
Background
In the existing loader unloading system, oil discharged by one hydraulic pump is divided into two paths through a priority valve, one path goes to a steering system, the other path enters an unloading valve, the other path enters the unloading valve, the other path and the oil discharged by the other hydraulic pump are combined and enter a working system, and the other path enters a cooler and enters an oil tank, but the existing unloading system has the following defects: the pressure of the oil entering the cooler is higher, and the service life of the cooler is influenced.
Disclosure of Invention
The embodiment of the utility model provides a hydraulic unloading control system and a loader, which are used for solving the problem that the service life of a cooler is influenced due to higher oil pressure entering the cooler in the existing unloading system.
In order to solve the technical problems, the embodiment of the utility model provides the following technical scheme:
the embodiment of the utility model provides a hydraulic unloading control system, which comprises the following components:
a priority valve in communication with the first hydraulic pump;
an unloading valve, the input end of which is communicated with the first output end of the priority valve;
the oil inlet of the electromagnetic reversing valve is communicated with the first output end of the unloading valve, the oil outlet of the electromagnetic reversing valve is connected with the input end of the cooler, and the output end of the cooler is connected with the oil tank.
Optionally, a first damping is also included;
a first communication point on the first passage is communicated with the oil tank through the first damping;
the first passage is a passage for communicating an oil inlet of the electromagnetic directional valve with a first output end of the unloading valve.
Optionally, the electromagnetic directional valve comprises a second damping port and an oil return port, and the electromagnetic directional valve comprises a first working position and a second working position;
in the first working position, an oil inlet of the electromagnetic directional valve is communicated with an oil outlet of the electromagnetic directional valve; under the second working position, an oil inlet of the electromagnetic directional valve is communicated with an oil return port of the electromagnetic directional valve, and the oil inlet of the electromagnetic directional valve is communicated with an oil outlet of the electromagnetic directional valve through the second damping;
and an oil return port of the electromagnetic reversing valve is communicated with the oil tank.
Optionally, the unloading valve comprises a first one-way valve, a pilot valve and an unloading valve core;
the inlet of the first one-way valve and the input end of the unloading valve core are respectively communicated with the first output end of the priority valve;
the outlet of the first one-way valve is communicated with a working system;
the input end of the pilot valve and the control end of the pilot valve are respectively communicated with the outlet of the first one-way valve, and the output end of the pilot valve is connected with the control end of the unloading valve core;
the output end of the unloading valve core is communicated with an oil inlet of the electromagnetic reversing valve.
Optionally, the method further comprises: a second hydraulic pump;
the input end of the second hydraulic pump is communicated with the oil tank, and the output end of the second hydraulic pump is communicated with the working system.
Optionally, the method further comprises: a sensor, and a controller electrically connected to the sensor;
the sensor is used for detecting the pressure of oil entering the electromagnetic directional valve;
the controller is electrically connected with the electromagnetic reversing valve;
the sensor sends a first indication signal to the controller, and the controller receiving the first indication signal sends a first control signal to the electromagnetic directional valve; the first indication signal is used for indicating that the pressure of oil entering the electromagnetic directional valve is lower than the preset rated pressure of the cooler, and the first control signal is used for controlling the electromagnetic directional valve to be in a first working position;
the sensor sends a second indication signal to the controller, and the controller receiving the second indication signal sends a second control signal to the electromagnetic directional valve; the second indication signal is used for indicating that the pressure of the oil liquid entering the electromagnetic directional valve is equal to or higher than the preset rated pressure of the cooler, and the second control signal is used for controlling the electromagnetic directional valve to be in a second working position;
the sensor sends a third indication signal to the controller, and the controller receiving the third indication signal sends an early warning signal to a supervisory system; the third indication signal is used for indicating that the pressure of the oil liquid entering the electromagnetic directional valve is equal to or higher than the preset rated pressure of the cooler, and the duration exceeds the preset duration.
Optionally, the method further comprises: a second one-way valve;
and an inlet of the second one-way valve is connected with one end of the cooler, and an inlet of the second one-way valve is connected with the other end of the cooler.
Optionally, the second output of the priority valve is in communication with a steering system.
The embodiment of the utility model also provides a loader, which comprises the hydraulic unloading control system.
The beneficial effects of the utility model are as follows:
the scheme of the utility model provides a hydraulic unloading control system, wherein an electromagnetic reversing valve is added between an unloading valve and a cooler, and can reduce the pressure of oil flowing out of the unloading valve and entering the cooler, and prolong the service life of the cooler.
Drawings
FIG. 1 is a schematic diagram of a prior art unloading system;
fig. 2 is a schematic structural diagram of a hydraulic unloading control system according to an embodiment of the present utility model.
Reference numerals illustrate:
1-a first hydraulic pump; 2-priority valve; 3-unloading valve; 31-a first one-way valve; 32-pilot valve; 33-unloading valve core; 4-an electromagnetic directional valve; 41-second damping; a 5-cooler; 6-an oil tank; 7-first damping; 8-a first pass; 9-a second hydraulic pump; 10-a sensor; 11-a controller; 12-a second one-way valve.
Detailed Description
The present utility model will be described in detail below with reference to the drawings and the specific embodiments thereof in order to make the objects, technical solutions and advantages of the present utility model more apparent.
Before describing the specific embodiments, the structure and operation principle of the conventional unloading system will be described as follows:
the structure of the existing loader unloading system is shown in fig. 1, in the existing unloading system, oil discharged by a first hydraulic pump 1 is divided into two paths through a priority valve 2, one path goes to a steering system, and the other path enters an unloading valve 3. One path entering the unloading valve 3 is divided into two paths, one path is merged with the second hydraulic pump 9 through a first one-way valve 31 in the unloading valve 3 and enters the working system, the other path enters the cooler 5 through an unloading valve core 33 in the unloading valve 3 and flows into the oil tank 6 through a second one-way valve 12 connected with the cooler 5 in parallel, and the second one-way valve 12 plays a role in cooling protection. When the front pressure of the cooler 5 exceeds the pressure set by the second check valve 12, the second check valve 12 opens and oil enters the tank through the second check valve 12. The spring-free end (left end) of the pilot valve 32 in the unloading valve 3 is controlled by the pressure of the second hydraulic pump 9, when the pressure of the second hydraulic pump 9 exceeds the pressure set by the pilot valve 32, the pilot valve 32 opens the right end (spring-free end) of the unloading valve core 33, the unloading valve core 33 is switched to the right position, and the oil discharged by the first hydraulic pump 1 is introduced into the cooler 5 and finally enters the hydraulic oil tank 6.
However, existing unloading systems have the following disadvantages:
1. when the oil discharged by the first hydraulic pump is unloaded through the unloading valve 3, the pressure entering the cooler 5 is still higher although the oil is protected by the second one-way valve 12, and the service life of the cooler 5 is influenced;
2. the second one-way valve 12 is easy to be opened by mistake due to the fluctuation interference of the pressure signal, so that the service life of the second one-way valve is reduced, and the heat dissipation efficiency is also influenced;
3. the response of the second one-way valve 12 has hysteresis;
4. when the cooler 5 is operated for a long period of time under overpressure, the overpressure alarm function is not provided, and the cooler 5 is broken and damaged.
In order to solve the above-mentioned shortcomings, the embodiment of the utility model provides a hydraulic unloading control system and a loader.
As shown in fig. 2, an embodiment of the present utility model provides a hydraulic unloading control system, including:
a priority valve 2 communicating with the first hydraulic pump 1, wherein an input end of the first hydraulic pump 1 communicates with an oil tank 6, and an output end of the first hydraulic pump 1 communicates with the priority valve 2;
an unloading valve 3, wherein the input end of the unloading valve 3 is communicated with the first output end of the priority valve 2, the priority valve 2 also comprises a second output end, and the second output end of the priority valve 2 is communicated with a steering system;
namely, the oil discharged by the first hydraulic pump 1 is divided into two paths through the priority valve 2, one path enters the steering system, and the other path enters the unloading valve 3.
The oil inlet of the electromagnetic directional valve 4 is communicated with the first output end of the unloading valve 3, oil entering the unloading valve 3 enters the electromagnetic directional valve 4 through the first output end of the unloading valve 3, the oil outlet of the electromagnetic directional valve 4 is connected with the input end of the cooler 5, and the output end of the cooler 5 is connected with the oil tank 6;
that is, in the embodiment of the present utility model, the electromagnetic directional valve 4 is added between the unloading valve 3 and the cooler 5, and the electromagnetic directional valve 4 can reduce the pressure of the oil flowing out of the unloading valve 3 and entering the cooler 5, thereby increasing the service life of the cooler 5.
In an alternative embodiment of the present utility model, the hydraulic unloading control system further includes: a first damper 7;
a first communication point on the first passage 8 is communicated with the oil tank 6 through the first damping 7;
the first passage 8 is a passage for communicating an oil inlet of the electromagnetic directional valve 4 with a first output end of the unloading valve 3.
Specifically, the oil output by the first output end of the unloading valve 3 is divided into two paths, one path enters the oil tank 6 through the first damping 7, and the other path enters the electromagnetic directional valve 4.
By adding the first damping 7, the disturbance of the pressure fluctuations can be reduced, adding a layer of protection function to the service life of the cooler 5.
The hydraulic unloading control system further includes: a second one-way valve 12;
the inlet of the second one-way valve 12 is connected with one end of the cooler 5, and the inlet of the second one-way valve 12 is connected with the other end of the cooler 5, namely, the second one-way valve 12 is connected with the cooler 5 in parallel, so as to protect the cooler 5.
In an alternative embodiment of the present utility model, the electromagnetic directional valve 4 includes a second damper 41 and an oil return port, and the electromagnetic directional valve 4 includes a first working position and a second working position;
under the first working position, an oil inlet of the electromagnetic directional valve 4 is communicated with an oil outlet of the electromagnetic directional valve 4; in the second working position, an oil inlet of the electromagnetic directional valve 4 is communicated with an oil return port of the electromagnetic directional valve 4, and the oil inlet of the electromagnetic directional valve 4 is communicated with an oil outlet of the electromagnetic directional valve 4 through the second damper 41; the oil return port of the electromagnetic directional valve 4 is communicated with the oil tank 6.
In the embodiment of the utility model, the first working position is a left position, and the second working position is a right position.
Specifically, when the electromagnetic directional valve 4 works in the left position, the oil entering the electromagnetic directional valve 4 directly enters the cooler 5, and when the electromagnetic directional valve 4 works in the right position, the oil entering the electromagnetic directional valve 4 is divided into two paths, one path flows into the cooler 5 through the second damper 41, and the other path flows back to the oil tank 6 through the oil return port.
In an alternative embodiment of the present utility model, the unloading valve 3 includes a first check valve 31, a pilot valve 32, and an unloading valve spool 33;
the inlet of the first one-way valve 31 and the input end of the unloading valve core 33 are respectively communicated with the first output end of the priority valve 2;
the outlet of the first one-way valve 31 is communicated with a working system;
the input end of the pilot valve 32 and the control end of the pilot valve 32 are respectively communicated with the outlet of the first check valve 31, and the output end of the pilot valve 32 is connected with the control end of the unloading valve core 33;
the output end of the unloading valve core 33 is communicated with an oil inlet of the electromagnetic directional valve 4.
Wherein, the hydraulic unloading control system further includes: a second hydraulic pump 9;
the input end of the second hydraulic pump 9 is communicated with the oil tank 6, and the output end of the second hydraulic pump 9 is communicated with a working system.
In this embodiment, one path of oil entering the unloading valve 3 is merged with oil discharged by the second hydraulic pump 9 through the first check valve 31 and enters the working system, and the other path of oil passes through the unloading valve core 33 and is communicated with the electromagnetic directional valve 4 through the first path 8, that is, the outlet of the unloading valve core 33 is the first output end of the unloading valve 3.
As an alternative embodiment of the present utility model, the hydraulic unloading control system further includes: a sensor 10 and a controller 11 electrically connected to the sensor 10;
the sensor 10 is used for detecting the pressure of oil entering the electromagnetic directional valve 4;
the controller 11 is electrically connected with the electromagnetic directional valve 4;
wherein, the sensor 10 sends a first indication signal to the controller 11, and the controller 11 receiving the first indication signal sends a first control signal to the electromagnetic directional valve 4; the first indication signal is used for indicating that the pressure of the oil entering the electromagnetic directional valve 4 is lower than the preset rated pressure of the cooler 5, and the first control signal is used for controlling the electromagnetic directional valve 4 to be in a first working position;
the sensor 10 sends a second indication signal to the controller 11, and the controller 11 receiving the second indication signal sends a second control signal to the electromagnetic directional valve 4; the second indication signal is used for indicating that the pressure of the oil entering the electromagnetic directional valve 4 is equal to or higher than the preset rated pressure of the cooler 5, and the second control signal is used for controlling the electromagnetic directional valve 4 to be in a second working position;
the sensor 10 sends a third indication signal to the controller 11, and the controller 11 receiving the third indication signal sends an early warning signal to a supervisory system; the third indication signal is used for indicating that the pressure of the oil entering the electromagnetic directional valve 4 is equal to or higher than the preset rated pressure of the cooler 5, and the duration exceeds the preset duration.
The working principle of the hydraulic unloading control system provided by the embodiment of the utility model is specifically described below:
when the oil pressure output by the second hydraulic pump 9 reaches the set pressure of the pilot valve 32, the pilot valve 32 is opened, and the oil (pressure oil) acts on the right end of the unloading valve core 33, so that the unloading valve core 33 works in the right position, and the oil (hydraulic oil) of the first hydraulic pump 1 is unloaded in the high-pressure state. At this time, the oil enters the oil tank through the first damper 7, so that unloading pressure can be primarily reduced, a first layer of protection for the cooler 5 is formed, and interference of pressure fluctuation on the sensor 10 can be prevented. When the sensor 10 detects that the unloading pressure (the oil pressure entering the electromagnetic directional valve 4) is lower than the rated use pressure (preset rated pressure) of the cooler 5, the electromagnetic directional valve 4 is not electrified to work at the left position, and the oil discharged by the first hydraulic pump 1 directly flows back to the oil tank 6 through the cooler 5. When the sensor 10 detects that the unloading pressure is equal to or higher than the rated use pressure of the cooler 5, the controller 11 is electrified to the electromagnetic directional valve 4, the electromagnetic directional valve 4 works in the right position, oil return is divided into two paths, most of oil directly flows back to the oil tank 6, and a small part of oil flows into the cooler 5 through the second damper 41 and finally enters the oil tank 6. When the sensor 10 detects that the unloading pressure is lower than the safe use pressure (preset rated pressure) of the cooler 5, the controller 11 controls the electromagnetic directional valve 4 to be powered off, the electromagnetic directional valve 4 is switched to work at the left position, and the first damping 7 can also reduce the impact pressure of the electromagnetic directional valve 4 caused by reversing, so that the cooler 5 is protected.
In addition, when the inlet pressure of the electromagnetic directional valve 4 is equal to or higher than the safe use pressure of the cooler 5 and exceeds a certain time (preset duration), the controller 11 can send out alarm information to an operator, so that the problem of overhigh pressure is solved in time, and the cooler 5 is prevented from being exploded in a double way.
The hydraulic unloading control system provided by the embodiment of the utility model has the following advantages:
1. adding a first damping 7, reducing the disturbance of pressure fluctuations and adding a first layer of protection function to the lifetime of the cooler 5;
2. the pressure detection device (comprising the sensor 10 and the controller 11) and the electromagnetic directional valve 4 are introduced, so that the control is more accurate, the response is quicker, the unloading pressure can be effectively reduced, and the service life of the cooler 5 is prolonged;
3. the opening frequency of the second one-way valve 12 is greatly reduced, the protection function is only realized when other elements are in failure, and the service life is also prolonged;
4. when the cooler 5 works in overpressure outside the set time, the set overpressure alarm function can prompt an operator to alarm an overhaul signal, so that the cooler 5 is prevented from being broken and damaged;
5. the system monitoring is realized, and more visual and timely maintenance information is provided.
The embodiment of the utility model also provides a loader, which comprises the hydraulic unloading control system.
It should be noted that, the loader provided by the embodiment of the utility model includes the hydraulic unloading control system as described above, and all embodiments of the hydraulic unloading control system described above are applicable to the loader, and the same or similar technical effects can be achieved.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the principles of the present utility model, and such modifications and changes are intended to be within the scope of the present utility model.
Claims (9)
1. A hydraulic unloading control system, characterized by comprising:
a priority valve (2) communicating with the first hydraulic pump (1);
an unloading valve (3), wherein the input end of the unloading valve (3) is communicated with the first output end of the priority valve (2);
the electromagnetic reversing valve (4), the oil inlet of the electromagnetic reversing valve (4) is communicated with the first output end of the unloading valve (3), the oil outlet of the electromagnetic reversing valve (4) is connected with the input end of the cooler (5), and the output end of the cooler (5) is connected with the oil tank (6).
2. The hydraulic unloading control system according to claim 1, further comprising a first damping (7);
a first communication point on the first passage (8) is communicated with the oil tank (6) through the first damping (7);
the first passage (8) is a passage for communicating an oil inlet of the electromagnetic directional valve (4) with a first output end of the unloading valve (3).
3. The hydraulic unloading control system according to claim 1, characterized in that the electromagnetic directional valve (4) includes a second damping (41) and an oil return port, and the electromagnetic directional valve (4) includes a first operating position and a second operating position;
in the first working position, an oil inlet of the electromagnetic directional valve (4) is communicated with an oil outlet of the electromagnetic directional valve (4); in the second working position, an oil inlet of the electromagnetic directional valve (4) is communicated with an oil return port of the electromagnetic directional valve (4), and the oil inlet of the electromagnetic directional valve (4) is communicated with an oil outlet of the electromagnetic directional valve (4) through the second damper (41);
wherein an oil return port of the electromagnetic directional valve (4) is communicated with the oil tank (6).
4. The hydraulic unloading control system according to claim 1, characterized in that the unloading valve (3) comprises a first check valve (31), a pilot valve (32) and an unloading valve spool (33);
the inlet of the first one-way valve (31) and the input end of the unloading valve core (33) are respectively communicated with the first output end of the priority valve (2);
the outlet of the first one-way valve (31) is communicated with a working system;
the input end of the pilot valve (32) and the control end of the pilot valve (32) are respectively communicated with the outlet of the first one-way valve (31), and the output end of the pilot valve (32) is connected with the control end of the unloading valve core (33);
the output end of the unloading valve core (33) is communicated with an oil inlet of the electromagnetic directional valve (4).
5. The hydraulic unloading control system according to claim 1, further comprising: a second hydraulic pump (9);
the input end of the second hydraulic pump (9) is communicated with the oil tank (6), and the output end of the second hydraulic pump (9) is communicated with a working system.
6. The hydraulic unloading control system according to claim 1, further comprising: a sensor (10), and a controller (11) electrically connected to the sensor (10);
the sensor (10) is used for detecting the pressure of oil entering the electromagnetic directional valve (4);
the controller (11) is electrically connected with the electromagnetic directional valve (4);
wherein the sensor (10) sends a first indication signal to the controller (11), and the controller (11) receiving the first indication signal sends a first control signal to the electromagnetic directional valve (4); the first indication signal is used for indicating that the pressure of oil entering the electromagnetic directional valve (4) is lower than the preset rated pressure of the cooler (5), and the first control signal is used for controlling the electromagnetic directional valve (4) to be at a first working position;
the sensor (10) sends a second indication signal to the controller (11), and the controller (11) receiving the second indication signal sends a second control signal to the electromagnetic directional valve (4); the second indication signal is used for indicating that the pressure of the oil entering the electromagnetic directional valve (4) is equal to or higher than the preset rated pressure of the cooler (5), and the second control signal is used for controlling the electromagnetic directional valve (4) to be in a second working position;
the sensor (10) sends a third indication signal to the controller (11), and the controller (11) receiving the third indication signal sends an early warning signal to a supervision system; the third indication signal is used for indicating that the pressure of the oil entering the electromagnetic directional valve (4) is equal to or higher than the preset rated pressure of the cooler (5), and the duration exceeds the preset duration.
7. The hydraulic unloading control system according to claim 1, further comprising: a second one-way valve (12);
an inlet of the second one-way valve (12) is connected with one end of the cooler (5), and an inlet of the second one-way valve (12) is connected with the other end of the cooler (5).
8. Hydraulic unloading control system according to claim 1, characterized in that the second output of the priority valve (2) communicates with a steering system.
9. A loader comprising the hydraulic unloading control system according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320275815.5U CN219639191U (en) | 2023-02-20 | 2023-02-20 | Hydraulic unloading control system and loader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320275815.5U CN219639191U (en) | 2023-02-20 | 2023-02-20 | Hydraulic unloading control system and loader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219639191U true CN219639191U (en) | 2023-09-05 |
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ID=87818716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320275815.5U Active CN219639191U (en) | 2023-02-20 | 2023-02-20 | Hydraulic unloading control system and loader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219639191U (en) |
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2023
- 2023-02-20 CN CN202320275815.5U patent/CN219639191U/en active Active
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