CN212985646U - Hydraulic system and engineering vehicle - Google Patents
Hydraulic system and engineering vehicle Download PDFInfo
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- CN212985646U CN212985646U CN202021335202.9U CN202021335202U CN212985646U CN 212985646 U CN212985646 U CN 212985646U CN 202021335202 U CN202021335202 U CN 202021335202U CN 212985646 U CN212985646 U CN 212985646U
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Abstract
The utility model relates to the field of hydraulic systems, and discloses a hydraulic system and an engineering vehicle, wherein the hydraulic system comprises a hydraulic pump, a multi-way valve, an actuator and an oil tank, the hydraulic pump can control the actuator to act through the multi-way valve, the actuator and the multi-way valve are respectively provided with at least two actuators, and the actuators are arranged in one-to-one correspondence with the multi-way valve; the hydraulic control system is characterized by further comprising an electric proportional overflow valve, an oil inlet of the electric proportional overflow valve is communicated with an oil outlet of the hydraulic pump, the oil outlet of the electric proportional overflow valve is communicated with an oil tank, the opening pressure of the electric proportional overflow valve is adjusted according to the working state of each actuator, sufficient pressure of a hydraulic system can be guaranteed when the hydraulic system normally works, a low-pressure standby state is maintained when the hydraulic system is in a standby state, energy waste is avoided, hydraulic oil of the hydraulic pump can be controlled at the initial stage of opening of a valve core of each multi-way valve, redundant flow is discharged, and the actuator is. The electric proportional overflow valve has multiple functions, the structure of the hydraulic system is simplified, and the cost of the hydraulic system is reduced.
Description
Technical Field
The utility model relates to a hydraulic system field especially relates to a hydraulic system and engineering vehicle.
Background
The hydraulic system mainly comprises a hydraulic pump, a multi-way valve and an actuator, wherein an oil outlet of the hydraulic pump is controlled to be selectively communicated or disconnected with an oil inlet of the actuator through the multi-way valve. In order to relieve the hydraulic pump when the actuator is not in operation, the oil outlet of the hydraulic pump is usually communicated with the oil tank through an overflow valve. In order to ensure the working stability of the hydraulic system, the oil outlet of the hydraulic pump is communicated with the oil tank through a bypass valve so as to return redundant flow to the oil tank, thereby ensuring the working stability of the hydraulic system.
However, when the arrangement is adopted, the bypass valve and the overflow valve are arranged at the same time, and partial functions of the bypass valve and the overflow valve are overlapped, so that the complexity and the cost of the hydraulic system are increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hydraulic system and engineering vehicle can simplify hydraulic system's structure, reduces hydraulic system's cost.
To achieve the purpose, the utility model adopts the following technical proposal:
a hydraulic system comprises a hydraulic pump, a multi-way valve, actuators and an oil tank, wherein the hydraulic pump can control the actuators to act through the multi-way valve, at least two actuators and at least two multi-way valves are arranged, and the actuators are arranged in one-to-one correspondence with the multi-way valves;
the hydraulic system further includes:
the oil inlet of the electric proportional overflow valve is communicated with the oil outlet of the hydraulic pump, the oil outlet of the electric proportional overflow valve is communicated with the oil tank, and the opening pressure of the electric proportional overflow valve can be adjusted according to the working state of each multi-way valve.
As a preferable technical solution of the hydraulic system, one of the actuators is a hydraulic cylinder, and the multi-way valve enables one of a rod chamber of the hydraulic cylinder and a rodless chamber of the hydraulic cylinder to communicate with an oil outlet of the hydraulic pump, and the other to communicate with the oil tank, or enables both the rod chamber and the rodless chamber to be disconnected from the oil tank and the oil outlet of the hydraulic pump.
As a preferable technical solution of the above hydraulic system, the rod chamber may be communicated with the oil tank through a first relief valve.
As a preferable technical solution of the above hydraulic system, the rod-less chamber may be communicated with the oil tank through a second relief valve.
As a preferable technical scheme of the hydraulic system, the multi-way valve corresponding to the hydraulic oil cylinder is a pilot reversing valve.
As a preferable technical solution of the above hydraulic system, one of the actuators is a hydraulic motor;
the multi-way valve corresponding to the hydraulic motor can enable one of two oil ports of the hydraulic motor to be communicated with the oil outlet of the hydraulic pump, and the other oil port of the hydraulic motor to be communicated with the oil tank, or enable the two oil ports of the hydraulic motor to be disconnected with the oil tank and the oil outlet of the hydraulic pump.
As a preferable aspect of the hydraulic system, the multi-way valve corresponding to the hydraulic motor is a pilot switching valve.
As a preferable technical scheme of the hydraulic system, the multi-way valve is a three-position five-way reversing valve.
As a preferable technical scheme of the hydraulic system, the multi-way valve is a three-position four-way reversing valve.
The utility model also provides an engineering vehicle, including foretell hydraulic system.
The utility model has the advantages that: the utility model provides a hydraulic system, according to the operating condition of every executor adjusts the opening pressure of electric proportional overflow valve, can not only guarantee the sufficient pressure of hydraulic system when normal during operation, maintain a low pressure standby when the standby, avoid the energy waste, the hydraulic oil that can also control the hydraulic pump at the initial stage that every multiple unit valve case was opened, let out unnecessary flow, guarantee that the executor steadily opens and does not have the impact, simplified hydraulic system's structure, hydraulic system's cost has been reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic diagram of a hydraulic system provided by an embodiment of the present invention.
In the figure:
1. a hydraulic pump; 2. an electric proportional relief valve; 3. a first directional valve; 4. a second directional valve; 5. a first overflow valve; 6. a second overflow valve; 7. a hydraulic cylinder; 8. a hydraulic motor; 9. and an oil tank.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.
As shown in fig. 1, the present embodiment provides a hydraulic system, which includes a hydraulic pump 1, a multi-way valve, an actuator, and an oil tank 9, where the hydraulic pump 1 can control the actuator to act through the multi-way valve, at least two actuators and at least two multi-way valves are provided, and the actuators and the multi-way valves are provided in a one-to-one correspondence manner. In this embodiment, for example, two actuators are provided, and two corresponding multi-way valves are also provided, where one actuator is a hydraulic cylinder 7, the other actuator is a hydraulic motor 8, the multi-way valve corresponding to the hydraulic cylinder 7 is a first direction valve 3, and the multi-way valve corresponding to the hydraulic motor 8 is a second direction valve 4.
The hydraulic system further comprises an electric proportional overflow valve 2, an oil inlet of the electric proportional overflow valve 2 is communicated with an oil outlet of the hydraulic pump 1, an oil outlet of the electric proportional overflow valve 2 is communicated with an oil tank 9, and the opening pressure of the electric proportional overflow valve 2 can be adjusted according to the working state of each multi-way valve.
In the embodiment, when the hydraulic oil cylinder 7 and the hydraulic motor 8 do not work, the electric proportional overflow valve 2 corresponds to an opening pressure; when the hydraulic oil cylinder 7 works and the hydraulic motor 8 does not work, the electric proportional overflow valve 2 corresponds to an opening pressure; when the hydraulic oil cylinder 7 does not work and the hydraulic motor 8 works, the electric proportional overflow valve 2 corresponds to an opening pressure; when the hydraulic oil cylinder 7 and the hydraulic motor 8 both work, the electric proportional overflow valve 2 corresponds to an opening pressure.
When at least one actuator works, the electric proportional overflow valve 2 can return redundant working oil to the oil tank 9 so as to ensure the stability of a hydraulic system in the working process of the actuator. When all the actuators do not work, the oil pressure of the oil outlet of the hydraulic pump 1 is increased to the oil pressure of the oil inlet of the electric proportional overflow valve 2, so that the working oil provided by the hydraulic pump 1 is sent back to the oil tank 9 through the electric proportional overflow valve 2, and the pressure relief of the hydraulic pump 1 is realized.
The hydraulic system that this embodiment provided, adjust the opening pressure of electric proportional relief valve 2 according to the operating condition of every executor, no matter what state makes every executor be in through the multiple unit valve that corresponds, not only can guarantee the sufficient pressure of hydraulic system when normal work, maintain a low pressure standby when the standby, avoid the energy waste, can also open the hydraulic oil of initial stage to hydraulic pump 1 at the case of every multiple unit valve and control, let out unnecessary flow, guarantee that the executor steadily opens and does not have the impact, hydraulic system's structure has been simplified, hydraulic system's cost has been reduced.
In this embodiment, the first directional valve 3 is a three-position five-way directional valve, five oil ports of the three-position five-way directional valve are respectively a P port, a first pressure relief port, a second pressure relief port, a first main oil port and a second main oil port, the three-position five-way directional valve has three states, namely a left position, a right position and a middle position, when the three-position five-way directional valve is in the left position, the P port is communicated with the first main oil port, the first pressure relief port is communicated with the second main oil port, and the second pressure relief port is blocked; when the three-position five-way reversing valve is positioned at the middle position, the port P, the first pressure relief port, the second pressure relief port, the first main oil port and the second main oil port are not communicated with each other; when the three-position five-way reversing valve is in the right position, the P port is communicated with the second oil port, the second pressure relief port is communicated with the first main oil port, and the first pressure relief port is blocked.
The P port is communicated with an oil outlet of the hydraulic pump 1, the first pressure relief port and the second pressure relief port are communicated with an oil tank 9, the first main oil port is communicated with a rodless cavity of the hydraulic oil cylinder 7, and the second main oil port is communicated with a rod cavity of the hydraulic oil cylinder 7.
When the three-position five-way reversing valve is in the left position, a rod cavity of the hydraulic oil cylinder 7 can be communicated with the oil tank 9 through the three-position five-way reversing valve, and a rodless cavity of the hydraulic oil cylinder 7 can be communicated with an oil outlet of the hydraulic pump 1 through the three-position five-way reversing valve; when the three-position five-way reversing valve is positioned at the middle position, the rod cavity and the rodless cavity are disconnected with the oil tank 9 and the oil outlet of the hydraulic pump 1; when the three-position five-way reversing valve is in the right position, a rod cavity of the hydraulic oil cylinder 7 can be communicated with an oil outlet of the hydraulic pump 1 through the three-position five-way reversing valve, and a rodless cavity of the hydraulic oil cylinder 7 can be communicated with the oil tank 9 through the three-position five-way reversing valve. Preferably, the multi-way valve corresponding to the hydraulic oil cylinder 7 is a pilot reversing valve.
Further, the rod chamber can be communicated with the oil tank 9 through the first overflow valve 5, and the rodless chamber can be communicated with the oil tank 9 through the second overflow valve 6. The rod cavity is protected through the first overflow valve 5, and the oil pressure in the rod cavity is prevented from being too high; the rodless cavity is protected through the second overflow valve 6, and the oil pressure in the rodless cavity is prevented from being too high.
In other embodiments, the number of the hydraulic cylinders 7 may also be two or more, and may be specifically set according to actual requirements.
Further, the second directional valve 4 is a three-position five-way reversing valve, and one of two oil ports of the hydraulic motor 8 can be communicated with the oil outlet of the hydraulic pump 1 and the other one of the two oil ports of the hydraulic motor 8 can be communicated with the oil tank 9 through the second directional valve 4, or the two oil ports of the hydraulic motor 8 can be disconnected from the oil tank 9 and the oil outlet of the hydraulic pump 1. The setting of the second directional valve 4 is the same as that of the first directional valve 3, and a description thereof will not be repeated.
In other embodiments, the number of the hydraulic motors 8 may also be two or more, and may be specifically set according to actual requirements.
It should be noted that one or both of the first directional valve 3 and the second directional valve 4 may also be set as a three-position four-way directional valve, or other directional valves capable of meeting the directional requirements.
The embodiment also provides an engineering vehicle comprising the hydraulic system.
It is obvious that the above embodiments of the present invention are only 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (10)
1. A hydraulic system comprises a hydraulic pump (1), a multi-way valve, actuators and an oil tank (9), wherein the hydraulic pump (1) can control the actuators to act through the multi-way valve, the hydraulic system is characterized in that at least two actuators and the multi-way valve are arranged, and the actuators and the multi-way valve are arranged in a one-to-one correspondence manner;
the hydraulic system further includes:
the oil inlet of the electric proportional overflow valve (2) is communicated with the oil outlet of the hydraulic pump (1), the oil outlet of the electric proportional overflow valve (2) is communicated with the oil tank (9), and the opening pressure of the electric proportional overflow valve (2) can be adjusted according to the working state of each multi-way valve.
2. The hydraulic system according to claim 1, characterized in that one of said actuators is a hydraulic cylinder (7) and said multi-way valve is capable of putting one of a rod chamber of said hydraulic cylinder (7) and a rodless chamber of said hydraulic cylinder (7) in communication with an outlet of said hydraulic pump (1) and the other in communication with said tank (9), or putting both said rod chamber and said rodless chamber out of communication with said tank (9) and with an outlet of said hydraulic pump (1).
3. A hydraulic system according to claim 2, characterized in that the rod chamber can communicate with the tank (9) via a first overflow valve (5).
4. A hydraulic system according to claim 2 or 3, characterized in that the rodless chamber is communicable with the tank (9) via a second excess flow valve (6).
5. A hydraulic system according to claim 2, characterized in that the multiplex valve corresponding to the hydraulic ram (7) is a pilot operated directional control valve.
6. A hydraulic system according to claim 1, characterized in that one of the actuators is a hydraulic motor (8);
the multi-way valve corresponding to the hydraulic motor (8) can enable one of two oil ports of the hydraulic motor (8) to be communicated with an oil outlet of the hydraulic pump (1) and the other of the two oil ports of the hydraulic motor (8) to be communicated with the oil tank (9), or enable the two oil ports of the hydraulic motor (8) to be disconnected with the oil tank (9) and the oil outlet of the hydraulic pump (1).
7. Hydraulic system according to claim 6, characterized in that the multiplex valve corresponding to the hydraulic motor (8) is a pilot operated directional control valve.
8. The hydraulic system of claim 1, wherein the multiplex valve is a three-position, five-way reversing valve.
9. The hydraulic system of claim 1, wherein the multiplex valve is a three-position, four-way reversing valve.
10. A work vehicle, characterized in that it comprises a hydraulic system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021335202.9U CN212985646U (en) | 2020-07-09 | 2020-07-09 | Hydraulic system and engineering vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021335202.9U CN212985646U (en) | 2020-07-09 | 2020-07-09 | Hydraulic system and engineering vehicle |
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| Publication Number | Publication Date |
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| CN212985646U true CN212985646U (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021335202.9U Active CN212985646U (en) | 2020-07-09 | 2020-07-09 | Hydraulic system and engineering vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355223A (en) * | 2022-08-12 | 2022-11-18 | 江苏徐工工程机械研究院有限公司 | Electronic control load sensitive bypass throttling control method and system and engineering machinery |
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2020
- 2020-07-09 CN CN202021335202.9U patent/CN212985646U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355223A (en) * | 2022-08-12 | 2022-11-18 | 江苏徐工工程机械研究院有限公司 | Electronic control load sensitive bypass throttling control method and system and engineering machinery |
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