CN216199328U - Hydraulic control system - Google Patents
Hydraulic control system Download PDFInfo
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- CN216199328U CN216199328U CN202122671399.4U CN202122671399U CN216199328U CN 216199328 U CN216199328 U CN 216199328U CN 202122671399 U CN202122671399 U CN 202122671399U CN 216199328 U CN216199328 U CN 216199328U
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Abstract
The utility model relates to the technical field of hydraulic pressure, in particular to a hydraulic control system which comprises a pilot hydraulic assembly, wherein the pilot hydraulic assembly comprises a pressure reducing valve and a handle, an oil inlet of the pressure reducing valve is communicated with a working pump, an oil outlet of the pressure reducing valve is communicated with the handle, and an energy accumulator is arranged on the handle; the working hydraulic assembly comprises a sequence valve and a control part, an oil inlet of the sequence valve is communicated with the working pump, an oil outlet of the sequence valve is communicated with the working valve, and the control part can control the sequence valve to be opened or closed; the control is configured to: when the pilot hydraulic assembly is filled with oil, the control controls the sequence valve to close; and when the oil charge of the pilot hydraulic assembly reaches a set pressure value, the control piece controls the sequence valve to be opened. The utility model can reduce the cost, ensure the control performance and reduce the complexity of the pipeline.
Description
Technical Field
The utility model relates to the technical field of hydraulic pressure, in particular to a hydraulic control system.
Background
The working device of the engineering machinery is generally controlled by a working hydraulic system, and in order to improve the comfortable operation performance, an operation system of the engineering machinery is generally controlled by a hydraulic pilot control system or an electro-hydraulic pilot control system. The normal operation of the hydraulic pilot control system or the electro-hydraulic pilot control system needs a hydraulic pilot oil source, and the hydraulic pilot oil source is supplied by a special pilot oil pump in most of machines at present.
The normal work of the current working hydraulic system needs to be configured with a working pump, and the oil pressure of the pilot system needs to be kept for existence all the time in order to ensure the quick response of the pilot system. Therefore, the overflow phenomenon of the pilot system occurs when the pilot system is operated or not operated by the handle. However, in the practical application process, the engineering machinery working devices all work discontinuously, the oil temperature of the working hydraulic system can be increased due to the fact that the pilot system is always in the overflow state, and in order to prevent the oil temperature of the pilot system from being too high, an oil cooler needs to be arranged for cooling, so that the temperature balance is kept. Due to the arrangement, the application cost of a working hydraulic system of the whole vehicle is too high, and pipelines are complex.
Therefore, a hydraulic control system is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a hydraulic control system which can reduce the cost, ensure the control performance and reduce the complexity of a pipeline.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a hydraulic control system comprising:
the pilot hydraulic assembly comprises a pressure reducing valve and a handle, an oil inlet of the pressure reducing valve is communicated with the working pump, an oil outlet of the pressure reducing valve is communicated with the handle, and an energy accumulator is arranged on the handle;
the working hydraulic assembly comprises a sequence valve and a control part, an oil inlet of the sequence valve is communicated with the working pump, an oil outlet of the sequence valve is communicated with the working valve, and the control part can control the sequence valve to be opened or closed;
the control is configured to: when the pilot hydraulic assembly is filled with oil, the control controls the sequence valve to close; and when the oil charge of the pilot hydraulic assembly reaches a set pressure value, the control piece controls the sequence valve to be opened.
Further, the control element is an unloading control valve, a first oil inlet of the unloading control valve is communicated with the working pump, and a first control port of the unloading control valve is communicated with the working pump; a second control port of the unloading control valve is communicated with an oil inlet of the handle, and an oil outlet of the unloading control valve is communicated with a control port of the sequence valve; an oil return port of the unloading control valve is communicated with an oil tank;
the unloading control valve is configured to: when the handle is filled with oil, the first oil inlet of the unloading control valve is communicated with the oil outlet of the unloading control valve, and the oil return port of the unloading control valve is closed; and when the oil filled into the handle reaches a set pressure value, the oil outlet of the unloading control valve is communicated with the oil return port of the unloading control valve.
Furthermore, a first cavity communicated with the first control port and a second cavity communicated with the second control port are arranged on the unloading control valve, and hydraulic oil entering the first cavity or the second cavity can push a valve core of the unloading control valve to act, so that an oil outlet of the unloading control valve is communicated with an oil return port of the unloading control valve.
Furthermore, the working hydraulic assembly further comprises a first overflow valve, an oil inlet of the first overflow valve is communicated with an oil inlet of the sequence valve, and an oil outlet of the first overflow valve is communicated with an oil outlet of the sequence valve.
Further, the pilot hydraulic assembly further comprises a second overflow valve, an oil inlet of the second overflow valve is communicated with an oil outlet of the pressure reducing valve, and an oil outlet of the second overflow valve is communicated with an oil tank.
Further, a first filter is arranged on a pipeline between the second overflow valve and the pressure reducing valve.
Further, a first throttle valve is arranged on a pipeline between the second overflow valve and the pressure reducing valve.
Furthermore, a one-way valve is arranged between the pressure reducing valve and the handle, an oil inlet of the one-way valve is communicated with an oil outlet of the pressure reducing valve, and an oil outlet of the one-way valve is communicated with the handle.
Further, a second filter is arranged on a pipeline between the working pump and the pressure reducing valve.
Further, a second throttle valve is arranged on a pipeline between the working pump and the pressure reducing valve.
The utility model has the beneficial effects that:
according to the hydraulic control system provided by the utility model, the handle is communicated with the working pump through the pressure reducing valve, and oil can be supplied to the handle by using the working pump, so that a pilot oil pump is prevented from being arranged independently; because the handle is provided with the energy accumulator, the energy accumulator can accumulate energy, and the pressure maintaining effect can be realized without supplying oil all the time, so that the response speed of the handle control is met. The control piece can open or close according to the pressure control sequence valve of the hydraulic oil of handle, and when the hydraulic pressure of handle does not satisfy the set pressure value, the work pump is preferred to be the handle fuel feeding to satisfy the needs of handle normal work. After the hydraulic control system is applied, a pilot oil pump and a heat dissipation system arranged for supplying oil to the handle can be eliminated, and meanwhile, oil filling is automatically stopped after the hydraulic pressure of the handle of the hydraulic control system reaches the set pressure, so that the overflow loss of the system is reduced, the energy consumption is reduced, the cost of the system is reduced, and the complexity of a pipeline is reduced.
Drawings
Fig. 1 is a schematic diagram of a hydraulic control system of the present invention.
In the figure:
1. a working pump; 11. a second throttle valve; 12. a second filter; 2. a pressure reducing valve; 21. a second overflow valve; 22. a first filter; 23. a first throttle valve; 3. a handle; 31. an accumulator; 32. a one-way valve; 4. An unloading control valve; 41. a first chamber; 42. a second chamber; 5. a sequence valve; 51. a first overflow valve; 6. an oil tank; 7. and a working valve.
Detailed Description
The technical scheme of the utility model is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In order to ensure excellent control performance of a hydraulic system controlled by a handle and reduce the complexity of a pipeline of the hydraulic control system, as shown in fig. 1, the utility model provides a hydraulic control system. A hydraulic control system comprising: a pilot hydraulic component and a working hydraulic component.
The pilot hydraulic assembly comprises a pressure reducing valve 2 and a handle 3, an oil inlet of the pressure reducing valve 2 is communicated with the working pump 1, an oil outlet of the pressure reducing valve 2 is communicated with the handle 3, and an energy accumulator 31 is arranged on the handle 3; the working hydraulic assembly comprises a sequence valve 5 and a control part, an oil inlet of the sequence valve 5 is communicated with the working pump 1, an oil outlet of the sequence valve 5 is communicated with a working valve 7, and the control part can control the sequence valve 5 to be opened or closed; the control is configured to: when the pilot hydraulic assembly is filled with oil, the control member controls the sequence valve 5 to close; when the pilot hydraulic assembly charge reaches a set pressure setting, the control controls the sequence valve 5 to open.
Because the handle 3 is provided with the energy accumulator 31, the energy accumulator 31 can store energy, and the pressure maintaining effect can be realized without supplying oil all the time, so that the response speed of the handle 3 in operation and control is met. The control piece can be according to the pressure control sequence valve 5 of the hydraulic oil of handle 3 and open or close, and when the hydraulic pressure of handle 3 does not satisfy the set pressure value, work pump 1 is preferred to the handle 3 oil supply to satisfy the needs of handle 3 normal work. After the hydraulic control system is applied, a pilot oil pump and a heat dissipation system arranged for supplying oil to the handle 3 can be eliminated, and meanwhile, the oil filling is automatically stopped after the hydraulic pressure of the handle 3 of the hydraulic control system reaches the set pressure, so that the overflow loss of the system is reduced, the energy consumption is reduced, the system cost is reduced, and the complexity of a pipeline is reduced.
Furthermore, the control element is an unloading control valve 4, a first oil inlet of the unloading control valve 4 is communicated with the working pump 1, and a first control port of the unloading control valve 4 is communicated with the working pump 1; a second control port of the unloading control valve 4 is communicated with an oil inlet of the handle 3, and an oil outlet of the unloading control valve 4 is communicated with a control port of the sequence valve 5; an oil return port of the unloading control valve 4 is communicated with an oil tank 6; the unloading control valve 4 is configured to: when the handle 3 is filled with oil, the first oil inlet of the unloading control valve 4 is communicated with the oil outlet of the unloading control valve 4, and the oil return port of the unloading control valve 4 is closed; when the oil filled in the handle 3 reaches a set pressure value, the oil outlet of the unloading control valve 4 is communicated with the oil return port of the unloading control valve 4.
Specifically, when the first oil inlet of the unloading control valve 4 is communicated with the oil outlet of the unloading control valve 4, the sequence valve 5 cannot be opened by the control force acting on the sequence valve 5, and after the oil outlet of the unloading control valve 4 is communicated with the oil return port of the unloading control valve 4, the unloading control valve 4 carries out unloading, so that the acting force acting on the valve core of the sequence valve 5 is reduced, and the sequence valve 5 is opened under the pushing of the hydraulic oil pumped out by the working pump 1, and the working pump 1 supplies oil to the working valve 7.
Specifically, the unloading control valve 4 is provided with a first cavity 41 communicated with the first control port and a second cavity 42 communicated with the second control port, and hydraulic oil entering the first cavity 41 or the second cavity 42 can push a valve core of the unloading control valve 4 to act, so that an oil outlet of the unloading control valve 4 is communicated with an oil return port of the unloading control valve 4. In the present embodiment, the force-receiving area of the first chamber 41 is smaller than the force-receiving area of the second chamber 42. One end of the unloading control valve 4 is provided with a spring for controlling the valve core, the spring enables the first oil inlet to be communicated with the oil outlet of the unloading control valve 4, in the working process of the working pump 1, part of hydraulic oil enters the first cavity 41 and the second cavity 42 to push the valve core to act, when the hydraulic pressure of the handle 3 reaches a set value, the hydraulic oil entering the first cavity 41 and the second cavity 42 enables the valve core to overcome the elastic force of the spring, the oil outlet of the unloading control valve 4 is communicated with the oil return port of the unloading control valve 4, and unloading of the unloading control valve 4 is achieved.
In this embodiment, the opening of the sequence valve 5 is controlled by the unloading control valve 4, the unloading control valve 4 is a two-position three-way functional valve, and the position switching of the two-position three-way valve is controlled by a side spring, a large area cavity and a small area cavity. The control pressure of the sequence valve 5 is unloaded when the pressure reaches the set pressure unloading control valve 4. The sequence valve 5 now only has to overcome the restoring spring force. The first chamber 41 and the second chamber 42 of the unloading control valve 4 have a certain proportion design, and can be specifically set according to actual needs.
Further, the working hydraulic assembly further comprises a first overflow valve 51, an oil inlet of the first overflow valve 51 is communicated with an oil inlet of the sequence valve 5, and an oil outlet of the first overflow valve 51 is communicated with an oil outlet of the sequence valve 5. By arranging the first overflow valve 51, when the sequence valve 5 cannot be normally opened, the overflow opening and supply working valve 7 is performed on the premise of ensuring the pilot pressure of the priority supply handle 3, so that the normal action is realized, and the abnormal high-pressure condition is prevented.
Further, the pilot hydraulic assembly further comprises a second overflow valve 21, an oil inlet of the second overflow valve 21 is communicated with an oil outlet of the pressure reducing valve 2, and an oil outlet of the second overflow valve 21 is communicated with the oil tank 6. By arranging the second overflow valve 21, the pressure of the second overflow valve 21 is set to be slightly higher than that of the pressure reducing valve 2, so that the pressure of the handle 3 can be ensured to be supplied after pressure reduction, and the pressure of the handle 3 can be ensured not to be ultrahigh.
Further, a one-way valve 32 is arranged between the pressure reducing valve 2 and the handle 3, an oil inlet of the one-way valve 32 is communicated with an oil outlet of the pressure reducing valve 2, and an oil outlet of the one-way valve 32 is communicated with the handle 3. After the handle 3 is filled with oil, the accumulator 31 is arranged, so that the hydraulic pressure on the side of the handle 3 is higher, after the sequence valve 5 is opened, the pressure of the hydraulic oil supplied to the pipeline of the handle 3 is lower, and the effect of preventing the hydraulic oil from flowing backwards can be achieved by arranging the one-way valve 32, so that the hydraulic pressure of the handle 3 is ensured, and the response speed when the handle 3 is used is ensured.
Further, a first filter 22 is provided in a line between the second relief valve 21 and the pressure reducing valve 2. Through setting up first filter 22, can filter the hydraulic oil that enters into second overflow valve 21 through relief pressure valve 2, promote fluid cleanliness, reduce the second overflow valve 21 trouble and take place.
Further, a first throttle valve 23 is provided on a pipeline between the second relief valve 21 and the pressure reducing valve 2. The flow rate of the hydraulic oil flowing to the second relief valve 21 can be regulated and controlled by providing the first throttle valve 23.
Further, a second filter 12 is provided in a pipe line between the working pump 1 and the pressure reducing valve 2. Can guarantee the cleanness of the hydraulic oil that enters into handle 3 through relief pressure valve 2 through setting up second filter 12, second filter 12 filters the impurity in the hydraulic oil to prevent to cause wearing and tearing to relief pressure valve 2 and handle 3.
Since the handle 3 only needs a small amount of hydraulic oil to satisfy the control requirement, in order to control the flow rate of the hydraulic oil flowing into the handle 3, a second throttle valve 11 is further provided on a pipe between the working pump 1 and the pressure reducing valve 2.
Under the normal working state, the outlet pressure of the working pump 1 is basically in a high pressure state, the handle 3 can be continuously supplied with oil, and the oil filling is automatically cut off after the set pressure is reached. The accumulator 31 has a long-time pressure maintaining function, and the pressure of the accumulator 31, which is originally filled with the oil pressure, is fed back to the unloading control valve 4 in a state where the working device is not operated for a short time, so that the sequence valve 5 is in an open state, and at this time, the handle 3 is not supplied with oil. In conclusion, the hydraulic control system has the functions of automatically controlling oil filling and cutting off the oil filling for the handle 3.
The hydraulic control system can use a part of hydraulic oil of the working pump 1 as an oil source of the handle 3 under the condition that a special pilot oil pump is not needed, and the working pump 1 can automatically charge oil to the handle 3 and the energy accumulator 31 thereof when the pressure of the handle 3 is lower than a set value; when the accumulator 31 pressure reaches the set value, the oil charge is stopped. The normal operation of the handle 3 and the normal operation of the working system are ensured.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A hydraulic control system, comprising:
the pilot hydraulic assembly comprises a pressure reducing valve (2) and a handle (3), an oil inlet of the pressure reducing valve (2) is communicated with the working pump (1), an oil outlet of the pressure reducing valve (2) is communicated with the handle (3), and an energy accumulator (31) is arranged on the handle (3);
the working hydraulic assembly comprises a sequence valve (5) and a control part, wherein an oil inlet of the sequence valve (5) is communicated with the working pump (1), an oil outlet of the sequence valve (5) is communicated with a working valve (7), and the control part can control the sequence valve (5) to be opened or closed;
the control is configured to: when the pilot hydraulic assembly is filled with oil, the control controls the sequence valve (5) to close; and when the oil charge of the pilot hydraulic assembly reaches a set pressure value, the control piece controls the sequence valve (5) to be opened.
2. A hydraulic control system according to claim 1, characterized in that the control element is an unloading control valve (4), a first oil inlet of the unloading control valve (4) is in communication with the working pump (1), and a first control port of the unloading control valve (4) is in communication with the working pump (1); a second control port of the unloading control valve (4) is communicated with an oil inlet of the handle (3), and an oil outlet of the unloading control valve (4) is communicated with a control port of the sequence valve (5); an oil return port of the unloading control valve (4) is communicated with an oil tank (6);
the unloading control valve (4) is configured to: when the handle (3) is filled with oil, a first oil inlet of the unloading control valve (4) is communicated with an oil outlet of the unloading control valve (4), and an oil return port of the unloading control valve (4) is closed; and when the oil filled in the handle (3) reaches a set pressure set value, the oil outlet of the unloading control valve (4) is communicated with the oil return port of the unloading control valve (4).
3. The hydraulic control system according to claim 2, wherein the unloading control valve (4) is provided with a first cavity (41) communicated with the first control port and a second cavity (42) communicated with the second control port, and hydraulic oil entering the first cavity (41) or the second cavity (42) can push a valve core of the unloading control valve (4) to act, so that an oil outlet of the unloading control valve (4) is communicated with an oil return port of the unloading control valve (4).
4. A hydraulic control system according to claim 1, characterized in that the working hydraulic assembly further comprises a first spill valve (51), the oil inlet of the first spill valve (51) being in communication with the oil inlet of the priority valve (5), the oil outlet of the first spill valve (51) being in communication with the oil outlet of the priority valve (5).
5. A hydraulic control system according to claim 1, characterized in that the pilot hydraulic assembly further comprises a second overflow valve (21), the oil inlet of the second overflow valve (21) being in communication with the oil outlet of the pressure reducing valve (2), the oil outlet of the second overflow valve (21) being in communication with an oil tank (6).
6. A hydraulic control system according to claim 5, characterised in that a first filter (22) is provided in the line between the second excess flow valve (21) and the pressure reducing valve (2).
7. A hydraulic control system according to claim 5, characterised in that a first throttle valve (23) is provided in the line between the second excess flow valve (21) and the pressure reducing valve (2).
8. The hydraulic control system according to claim 1, wherein a check valve (32) is arranged between the pressure reducing valve (2) and the handle (3), an oil inlet of the check valve (32) is communicated with an oil outlet of the pressure reducing valve (2), and an oil outlet of the check valve (32) is communicated with the handle (3).
9. A hydraulic control system according to claim 1, characterized in that a second filter (12) is arranged in the line before the working pump (1) and the pressure reducing valve (2).
10. A hydraulic control system according to claim 1, characterized in that a second throttle valve (11) is arranged in the line before the working pump (1) and the pressure reducing valve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122671399.4U CN216199328U (en) | 2021-11-03 | 2021-11-03 | Hydraulic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122671399.4U CN216199328U (en) | 2021-11-03 | 2021-11-03 | Hydraulic control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216199328U true CN216199328U (en) | 2022-04-05 |
Family
ID=80901651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122671399.4U Active CN216199328U (en) | 2021-11-03 | 2021-11-03 | Hydraulic control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216199328U (en) |
-
2021
- 2021-11-03 CN CN202122671399.4U patent/CN216199328U/en active Active
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