阅读说明：本技术 定量系统变量化的液压系统 (hydraulic system with quantitative system variable ) 是由 乔战战 谢朝阳 张安民 孙志远 于 2019-09-29 设计创作，主要内容包括：本发明公布一种定量系统变量化的液压系统,属于工程机械技术领域。包括：工作液压缸,用于驱动作业部件运动；多路阀,用于控制工作液压缸运动；工作液压泵,包括用于为所述工作液压缸提供液压流体的第一液压泵和第二液压泵；优先阀,与所述第二液压泵连通；变量化控制阀,与所述第一液压泵、优先阀、多路阀连通。本发明在工作液压缸的负载压力小于预定值△P1或者大于预定值△P2时,第一液压泵排出的液压流体不再向工作液压缸输送,而是直接回流至液压流体箱,液压系统可以避免第一液压泵和第二液压泵均工作在大功率的工作状态下,有利于降低液压系统的能耗。(The invention discloses a hydraulic system for quantitative system quantization, and belongs to the technical field of engineering machinery. The method comprises the following steps: the working hydraulic cylinder is used for driving the working component to move; the multi-way valve is used for controlling the working hydraulic cylinder to move; a working hydraulic pump including a first hydraulic pump and a second hydraulic pump for supplying hydraulic fluid to the working hydraulic cylinder; a priority valve in communication with the second hydraulic pump; and the variable-quantity control valve is communicated with the first hydraulic pump, the priority valve and the multi-way valve. When the load pressure of the working hydraulic cylinder is smaller than the preset value delta P1 or larger than the preset value delta P2, the hydraulic fluid discharged by the first hydraulic pump is not conveyed to the working hydraulic cylinder any more, but directly flows back to the hydraulic fluid tank, and the hydraulic system can prevent the first hydraulic pump and the second hydraulic pump from working in a high-power working state, so that the energy consumption of the hydraulic system is reduced.)

1. a hydraulic system for quantitative system variation, comprising:

the working hydraulic cylinder (5) is used for driving the working component to move;

The multi-way valve (4) is used for controlling the working hydraulic cylinder (5) to move;

-a working hydraulic pump comprising a first hydraulic pump (2) and a second hydraulic pump (10) for providing hydraulic fluid to the working hydraulic cylinder (5);

a priority valve (9) in communication with the second hydraulic pump (10);

A variable control valve (3) which is communicated with the first hydraulic pump (2), the priority valve (9) and the multi-way valve (4) and is used for merging the hydraulic fluid discharged by the second hydraulic pump (10) to the multi-way valve (4) through the priority valve (9) and the hydraulic fluid discharged by the first hydraulic pump (2) when the load pressure of the working hydraulic cylinder (5) is greater than or equal to a preset value delta P1 and smaller than a preset value delta P2 and then flowing to the working hydraulic cylinder (5); when the load pressure of the working hydraulic cylinder (5) is greater than or equal to a preset value delta P2, hydraulic fluid discharged by the first hydraulic pump (2) flows to a hydraulic oil tank (1) through the variable control valve (3); when the load pressure of the working hydraulic cylinder (5) is smaller than a delta P1 preset value, the flow discharged by the first hydraulic pump (2) flows to the hydraulic oil tank (1) through the variable control valve (3).

2. the hydraulic system of claim 1, wherein the hydraulic system comprises: the variable control valve (3) comprises a buffer valve (21), a control unloading valve (22), a one-way valve I (24) and a one-way valve II (25), and the variable control valve (3) is provided with an oil port T, an oil port A, an oil port P1 and an oil port P2; a first oil inlet of the buffer valve (21) is connected with the oil port P1, a first oil outlet of the buffer valve (21) is connected with the oil port T, and a second oil outlet of the buffer valve (21) is communicated to the oil port A in a one-way mode through a one-way valve II (25); the preset value of a spring I (28) in a spring cavity at one end of the cushion valve (21) is delta P1, and a control cavity at the other end of the cushion valve (21) is connected with the control unloading valve (22); the control unloading valve (22) is connected to the hydraulic oil tank (1), the preset value of a spring II (29) in a spring cavity at one end of the unloading valve (22) is delta P2, and a control cavity at the other end of the unloading valve (22) is connected with an oil port A; the oil port P2 is communicated to the oil port A in a one-way mode through a one-way valve I (24).

3. the hydraulic system of claim 2, wherein the hydraulic system comprises: the control cavity of the unloading valve (22) is connected with the oil port A through a first control oil path (51) and a sixth control oil path (57), the oil outlet of the unloading valve (22) is connected with the oil tank (1) through an unloading oil path (52), and the oil inlet of the unloading valve (22) is connected with the control cavity of the buffer valve (21) through a second control oil path (53); a damping component I (23) is connected between the first control oil path (51) and the second control oil path (53).

4. the hydraulic system of claim 2, wherein the hydraulic system comprises: the spring cavity of the cushion valve (21) is connected with the oil port T through a fourth control oil way (55), and a damping part II (26) is installed in the fourth control oil way (55); and a spring cavity of the cushion valve (21) is connected with the oil port A through a fifth control oil path (56), and a damping part III (27) is installed in the fifth control oil path (56).

5. Hydraulic system of quantitative system variation according to claim 2, characterized in that the buffer valve (21) comprises:

A valve body;

The first oil inlet is formed in the valve body and communicated with the first hydraulic pump (2);

The first oil outlet is formed in the valve body and is communicated with a hydraulic oil tank (1);

the second oil outlet is arranged on the valve body and is communicated with a multi-way valve (4) for controlling the working hydraulic cylinder (5);

a spool movably disposed within the valve body and having a first position and a second position; in the first position, the first oil inlet and the first oil outlet are in communication; and at the second position, the first oil inlet is communicated with the second oil outlet.

6. Hydraulic system of quantitative system variation according to claim 2, characterized in that said unloading valve (22) comprises:

A valve body;

the oil inlet is arranged on the valve body and communicated with the spring cavity of the buffer valve (21);

the oil outlet is arranged on the valve body and is communicated with a hydraulic oil tank (1);

a spool movably disposed within the valve body having a first position and a second position; the first position disconnects the second control oil passage (53) from the unloading oil passage (52), and the second position connects the second control oil passage (53) to the unloading oil passage (52).

7. the hydraulic system of claim 2, wherein the hydraulic system comprises: an oil port P1 of the variable quantitative control valve (3) is connected with the first hydraulic pump (2), an oil port T of the variable quantitative control valve (3) is connected with the hydraulic oil tank (1), an oil port A of the variable quantitative control valve (3) is connected with the multi-way valve (4), and an oil port P2 of the variable quantitative control valve (3) is connected with the priority valve (9).

8. The hydraulic system of claim 1,

further comprising:

the oil inlet P1 of the pilot oil source valve (13) is connected with the first hydraulic pump (2), the oil inlet P2 of the pilot oil source valve (13) is connected with the second hydraulic pump (10), and the oil outlet of the pilot oil source valve (13) is connected with the pilot valve (6) of the multi-way valve (4).

9. the hydraulic system of claim 1, wherein the hydraulic system comprises: the priority valve (9) is connected with a steering gear (8), and the steering gear (8) is connected with a steering hydraulic cylinder (7) in a control mode.

10. a hydraulic system for quantitative system variation, comprising:

the working hydraulic cylinder (5) is used for driving the working component to move;

the multi-way valve (4) is used for controlling the working hydraulic cylinder (5) to move;

-a working hydraulic pump comprising a first hydraulic pump (2) and a second hydraulic pump (10) for providing hydraulic fluid to the working hydraulic cylinder (5);

a priority valve (9) in communication with the second hydraulic pump (10);

A variable control valve (3) which is communicated with the first hydraulic pump (2), the priority valve (9) and the multi-way valve (4) and is used for merging the hydraulic fluid discharged by the second hydraulic pump (10) to the multi-way valve (4) through the priority valve (9) and the hydraulic fluid discharged by the first hydraulic pump (2) when the load pressure of the working hydraulic cylinder (5) is greater than or equal to a preset value delta P1 and then flowing to the working hydraulic cylinder (5); when the load pressure of the working hydraulic cylinder (5) is smaller than a delta P1 preset value, the flow discharged by the first hydraulic pump (2) flows to the hydraulic oil tank (1) through the variable control valve (3).

Technical Field

the invention relates to the technical field of engineering machinery, in particular to a hydraulic system with a quantitative system.

Background

Disclosure of Invention

In order to solve the technical problems, the invention provides a hydraulic system with a quantitative system, which solves the problems of high working efficiency and high energy consumption of the hydraulic system of the existing engineering vehicle.

The invention is realized by the following technical scheme: a hydraulic system for quantitative system variation, comprising:

The working hydraulic cylinder is used for driving the working component to move;

The multi-way valve is used for controlling the working hydraulic cylinder to move;

a working hydraulic pump including a first hydraulic pump and a second hydraulic pump for supplying hydraulic fluid to the working hydraulic cylinder;

a priority valve in communication with the second hydraulic pump;

a variable control valve which is communicated with the first hydraulic pump, the priority valve and the multi-way valve, and is used for merging the hydraulic fluid discharged by the second hydraulic pump and the hydraulic fluid discharged by the first hydraulic pump to the multi-way valve through the priority valve and then flowing to the working hydraulic cylinder when the load pressure of the working hydraulic cylinder is greater than or equal to a preset value delta P1 and less than a preset value delta P2; when the load pressure of the working hydraulic cylinder is greater than or equal to a preset value delta P2, hydraulic fluid discharged by the first hydraulic pump flows to a hydraulic oil tank through a variable control valve; when the load pressure of the working hydraulic cylinder is smaller than the delta P1 preset value, the flow discharged by the first hydraulic pump flows to the hydraulic oil tank through the variable control valve.

It further comprises the following steps: the variable control valve comprises a buffer valve, a control unloading valve, a one-way valve I and a one-way valve II, and is provided with an oil port T, an oil port A, an oil port P1 and an oil port P2; the first oil inlet of the buffer valve is connected with the oil port P1, the first oil outlet of the buffer valve is connected with the oil port T, and the second oil outlet of the buffer valve is communicated to the oil port A in a one-way mode through the one-way valve II; the preset value of a spring I in a spring cavity at one end of the cushion valve is delta P1, and a control cavity at the other end of the cushion valve is connected with the control unloading valve; the control unloading valve is connected to a hydraulic oil tank, the preset value of a spring II in a spring cavity at one end of the unloading valve is delta P2, and a control cavity at the other end of the unloading valve is connected with an oil port A; the oil port P2 is communicated to the oil port A in a one-way mode through the check valve I.

The unloading valve control cavity is connected with the oil port A through a first control oil way and a sixth control oil way, the oil outlet of the unloading valve is connected with the oil pressing tank through the unloading oil way, and the oil inlet of the unloading valve is connected with the buffer valve control cavity through a second control oil way; and a damping part I is connected between the first control oil path and the second control oil path.

The buffer valve spring cavity is connected with the oil port T through a fourth control oil way, and a damping part II is installed in the fourth control oil way; and the spring cavity of the buffer valve is connected with the oil port A through a fifth control oil way, and a damping part III is installed in the fifth control oil way.

The cushion valve includes:

a valve body;

the first oil inlet is formed in the valve body and communicated with the first hydraulic pump;

the first oil outlet is arranged on the valve body and is communicated with a hydraulic oil tank;

the second oil outlet is arranged on the valve body and is used for communicating with a multi-way valve for controlling the working hydraulic cylinder;

a spool movably disposed within the valve body and having a first position and a second position; in the first position, the first oil inlet and the first oil outlet are in communication; and at the second position, the first oil inlet is communicated with the second oil outlet.

The unloading valve comprises:

A valve body;

The oil inlet is arranged on the valve body and communicated with the spring cavity of the buffer valve;

the oil outlet is arranged on the valve body and is communicated with a hydraulic oil tank;

a spool movably disposed within the valve body having a first position and a second position; the first position disconnects the second control oil passage from the unloading oil passage, and the second position communicates the second control oil passage with the unloading oil passage.

the oil port P1 of the variable quantization control valve is connected with the first hydraulic pump, the oil port T of the variable quantization control valve is connected with the hydraulic oil tank, the oil port A of the variable quantization control valve is connected with the multi-way valve, and the oil port P2 of the variable quantization control valve is connected with the priority valve.

further comprising:

The oil inlet P1 of the pilot oil source valve is connected with the first hydraulic pump, the oil inlet P2 of the pilot oil source valve is connected with the second hydraulic pump, and the oil outlet of the pilot oil source valve is connected with the pilot valve of the multi-way valve.

The priority valve is connected with a steering gear, and the steering gear is connected with a steering hydraulic cylinder in a control mode.

And a radiator and a filter are arranged in a pipeline between the return port T of the multi-way valve and the hydraulic oil tank.

A hydraulic system for quantitative system variation, comprising:

the working hydraulic cylinder is used for driving the working component to move;

The multi-way valve is used for controlling the working hydraulic cylinder to move;

a working hydraulic pump including a first hydraulic pump and a second hydraulic pump for supplying hydraulic fluid to the working hydraulic cylinder;

A priority valve in communication with the second hydraulic pump;

A variable control valve which is communicated with the first hydraulic pump, the priority valve and the multi-way valve, and is used for converging the hydraulic fluid discharged by the second hydraulic pump and the hydraulic fluid discharged by the first hydraulic pump to the multi-way valve through the priority valve when the load pressure of the working hydraulic cylinder is greater than or equal to a preset value delta P1, and then flowing to the working hydraulic cylinder; when the load pressure of the working hydraulic cylinder is smaller than the delta P1 preset value, the flow discharged by the first hydraulic pump flows to the hydraulic oil tank through the variable control valve.

compared with the prior art, the invention has the beneficial effects that: when the load pressure of the working hydraulic cylinder is smaller than a preset value delta P1 or larger than a preset value delta P2, the hydraulic fluid discharged by the first hydraulic pump is not conveyed to the working hydraulic cylinder any more, but directly flows back to the hydraulic fluid tank, and the hydraulic system can prevent the first hydraulic pump and the second hydraulic pump from working in a high-power working state, so that the energy consumption of the hydraulic system is reduced; the problem that the working efficiency and the energy consumption of the existing engineering vehicle hydraulic system are high is solved, and the quantitative system is enabled to realize quantization under certain working conditions.

Drawings

fig. 1 is a schematic structural diagram of a hydraulic system according to a first embodiment of the invention;

Fig. 2 is a schematic structural diagram of a variable control valve of a hydraulic system according to a first embodiment of the invention;

Fig. 3 shows another structural diagram of the variable quantity control valve of the second embodiment of the invention under some special working conditions.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.