阅读说明：本技术 一种工作装置的液压系统 (Hydraulic system of working device ) 是由 汪立平 哈良 贾靖 黄国和 刘红光 张国良 韩俊翔 翟莉 于 2019-09-26 设计创作，主要内容包括：本发明涉及作业机械液压系统,具体涉及一种工作装置的液压系统,包括：至少一个液压泵,所述至少一个液压泵喷出工作油；致动器,所述致动器通过来自所述至少一个液压泵的工作油的供应而工作；还包括再生油路,所述再生油路用于将返回油作为再生油送到所述致动器的呈负压的腔体内,所述返回油是从所述致动器泄出的工作油,所述再生油路上设置有再生阀组,所述再生阀组控制所述再生油路的通断和流通方向；再生切断油路,所述再生切断油路将再生油送到其它目的地,所述再生切断油路上设置有再生切断阀。解决了现有技术中的液压系统存在的再生及再生切断控制结构复杂、调节性低、响应性慢的技术问题。(The invention relates to a hydraulic system of a working machine, in particular to a hydraulic system of a working device, which comprises: at least one hydraulic pump that discharges working oil; an actuator operated by a supply of working oil from the at least one hydraulic pump; the hydraulic control system further comprises a regeneration oil path, wherein the regeneration oil path is used for sending return oil serving as regeneration oil to a cavity of the actuator, wherein the cavity is in a negative pressure state, the return oil is working oil discharged from the actuator, a regeneration valve group is arranged on the regeneration oil path, and the regeneration valve group controls the on-off and flowing direction of the regeneration oil path; and a regeneration cutoff oil passage that sends the regeneration oil to another destination, the regeneration cutoff oil passage being provided with a regeneration cutoff valve. The hydraulic system solves the technical problems of complex regeneration and regeneration cut-off control structure, low adjustability and slow response existing in the hydraulic system in the prior art.)

1. A hydraulic system of a work apparatus, comprising:

At least one hydraulic pump that discharges working oil;

An actuator (7) operated by a supply of working oil from the at least one hydraulic pump;

It is characterized in that the preparation method is characterized in that,

the hydraulic control system is characterized by further comprising a regeneration oil path (1), wherein the regeneration oil path (1) is used for sending return oil serving as regeneration oil to a cavity of the actuator (7) which is in a negative pressure state, the return oil is working oil leaked from the actuator (7), a regeneration valve group (11) is arranged on the regeneration oil path (1), and the regeneration valve group (11) controls the on-off and flowing direction of the regeneration oil path (1);

And a regeneration cutoff oil path (2), wherein the regeneration cutoff oil path (2) sends the regeneration oil to other destinations, and a regeneration cutoff valve (21) is arranged on the regeneration cutoff oil path (2).

2. the hydraulic system of a working device according to claim 1, wherein the hydraulic pumps are two, and the pump outlets of the two hydraulic pumps are respectively provided with a control valve, and the two hydraulic pumps can be combined to respectively supply oil to the two cavities of the actuator (7) under the control of the control valves.

3. the hydraulic system of a working device according to claim 2, wherein the two cavities of the actuator are a cavity I (71) and a cavity II (72), the cavity I (71) is communicated with the first working oil path (5), the cavity II (72) is communicated with the second working oil path (6), and each hydraulic pump is communicated with the first working oil path (5) and the second working oil path (6) under the control of a control valve.

4. The hydraulic system of a working device according to claim 3, wherein both ends of the regeneration oil passage (1) communicate with the second working oil passage (6) and the first working oil passage (5), respectively.

5. The hydraulic system of a working device according to claim 4, wherein the two hydraulic pumps are a hydraulic pump ip 1 and a hydraulic pump ii P2, the hydraulic pump ip 1 supplies oil to the cavity i (71) and the cavity ii (72) under the control of a control valve i (41), the control valve i (41) includes a pressure port P1, an oil return port T1, a regeneration cut-off port c and two working ports a1 and b1, the pressure port P1 is communicated with the pump outlet of the hydraulic pump ip 1, the oil return port T1 is communicated with the oil return tank T, the two working ports a1 and b1 are communicated with the first working oil passage (5) and the second working oil passage (6), and the regeneration cut-off port c is communicated with the regeneration cut-off oil passage (2).

6. The hydraulic system of a working device according to claim 5, wherein a hydraulic pump IIP 2 is respectively communicated with the first working oil path (5) and the second working oil path (6) under the control of a control valve II (42), the control valve II (42) comprises a pressure port P2, an oil return port T2 and two working oil ports a2 and b2, the pressure port P2 is communicated with a pump outlet of the hydraulic pump II P2, the oil return port T2 is communicated with the oil return tank T, and the two working oil ports a2 and b2 are respectively communicated with the first working oil path (5) and the second working oil path (6).

7. the hydraulic system of a working device according to claim 6, wherein the control valve I (41) and the control valve II (42) each have a neutral position and two working positions, and when the control valve I (41) and the control valve II (42) are both located at the first working position, the two hydraulic pumps are merged to supply oil to the chamber I (71), and the working oil discharged from the chamber II is regenerated to the chamber I (71) through the regeneration oil passage (1) and/or circulated to the regeneration cutoff oil passage (2) through the control valve I (71) and then delivered to other destinations; when the two control valves are both positioned at the second working position, the two hydraulic pumps are converged into the cavity II (72) for supplying oil, and the hydraulic oil discharged from the cavity I (71) can return oil through the two control valves.

8. The hydraulic system of a working device according to any one of claims 5 to 7, wherein the control valve I (41) is replaced by a control valve III (43), the control valve III (43) comprises a pressure port P3, a return port T3 and two working ports a3 and b3, the pressure port P3 is communicated with a pump outlet of the hydraulic pump IP 1, the return port T3 is communicated with the return tank T, and the two working ports a3 and b3 are respectively communicated with the first working oil path (5) and the second working oil path (6).

9. the hydraulic system of a working device according to claim 8, wherein the control valve iii (43) has a neutral position and two working positions, when the control valve iii (43) and the control valve ii (42) are both located at the first working position, the two hydraulic pumps are merged to supply oil to the chamber i (71), and the working oil discharged from the chamber ii (72) is regenerated to the chamber i (72) through the regeneration oil passage (1) or is delivered to other destinations through the regeneration cutoff oil passage (2); when the control valve III (43) and the control valve II (42) are both located at the second working position, the two hydraulic pumps are converged to supply oil to the cavity II (72), and hydraulic oil discharged from the cavity I (71) can return oil through the control valve III (43) and the control valve II (42).

10. The hydraulic system of a working device according to claim 8, wherein the regeneration-cut oil passage (2) communicates with the second working oil passage (6).

Technical Field

The invention relates to a hydraulic system of a working machine, in particular to a hydraulic system of a working device.

Background

in the current engineering machinery, the excavator is greatly popularized and applied in use, and the oil consumption, the working efficiency and the operation convenience of the excavator are main attention objects of various host manufacturing companies, research and development mechanisms and customers. The excavator working device comprises a movable arm, an arm, a bucket and a working device hydraulic pipeline including a movable arm oil cylinder, an arm oil cylinder and a bucket oil cylinder, wherein the arm is used as an important component of the excavator working device, and the reasonable arrangement of a hydraulic system of the arm is of great significance to the working performance of the excavator.

Disclosure of Invention

The invention provides a hydraulic system of a working device, which aims to solve the technical problems of complicated regeneration and regeneration cut-off control structure, low adjustability and slow response existing in the hydraulic system in the prior art. The technical scheme of the invention is as follows:

A hydraulic system of a work apparatus, comprising: at least one hydraulic pump that discharges working oil; an actuator operated by a supply of working oil from the at least one hydraulic pump; the hydraulic control system further comprises a regeneration oil path, wherein the regeneration oil path is used for sending return oil serving as regeneration oil to a cavity of the actuator, wherein the cavity is in a negative pressure state, the return oil is working oil discharged from the actuator, a regeneration valve group is arranged on the regeneration oil path, and the regeneration valve group controls the on-off and flowing direction of the regeneration oil path; and a regeneration cutoff oil passage that sends the regeneration oil to another destination, the regeneration cutoff oil passage being provided with a regeneration cutoff valve.

The regeneration oil way and the regeneration cut-off oil way are arranged, the regeneration valve is arranged on the regeneration oil way, the regeneration cut-off valve is arranged on the regeneration cut-off oil way, the working oil discharged from the cavity II flows to the cavity I through the regeneration oil way, so that the regeneration utilization is realized, and the working condition of the regeneration oil way is controlled by the regeneration valve; when cavity I need not the regeneration oil, the regeneration oil can cut off the oil circuit through the regeneration to other destinations. Compared with the prior art, the regeneration valve and the regeneration cut-off valve are not required to be integrated on the pumping control valve of the hydraulic pump, regeneration and regeneration cut-off control are simplified, the adjusting performance is good, and the responsiveness is fast.

Furthermore, the number of the hydraulic pumps is two, pump outlets of the two hydraulic pumps are respectively provided with a control valve, and the two hydraulic pumps can be combined to respectively supply oil to the two cavities of the actuator under the control of the control valves. The oil is supplied to the cavity II or the cavity I through confluence, and the bucket rod is quick in response.

Further, two cavities of the actuator are respectively a cavity I and a cavity II, the cavity I is communicated with a first working oil path, the cavity II is communicated with a second working oil path, and each hydraulic pump is respectively communicated with the first working oil path and the second working oil path under the control of the control valve.

Further, both ends of the regeneration oil passage are respectively communicated with the second working oil passage and the first working oil passage.

further, two hydraulic pumps are hydraulic pump IP 1 and hydraulic pump IIP 2 respectively, hydraulic pump IP 1 is cavity I and II fuel supplies oil of cavity respectively under control of control valve I, control valve I includes pressure hydraulic fluid port P1, oil return port T1, regeneration cut off hydraulic fluid port c and two working fluid ports a1, b1, pressure hydraulic fluid port P1 with hydraulic pump IP 1's pump export intercommunication, oil return port T1 with oil return tank T intercommunication, two working fluid ports a1, b1 respectively with first working oil circuit and second working oil circuit intercommunication, regeneration cut off hydraulic fluid port c with regeneration cut off the oil circuit intercommunication.

Further, hydraulic pump IIP 2 switches on with first working oil circuit, second working oil circuit respectively under control valve II's control, control valve II includes pressure hydraulic fluid port P2, oil return port T2 and two working fluid ports a2, b2, pressure hydraulic fluid port P2 with hydraulic pump IIP 2's pump mouth intercommunication, oil return port T2 with oil return tank T intercommunication, two working fluid ports a2, b2 respectively with first working oil circuit and second working oil circuit intercommunication.

Furthermore, the control valve I and the control valve II are both provided with a middle position and two working positions, when the control valve I and the control valve II are both positioned at the first working position, the two hydraulic pumps are converged to supply oil to the cavity I, and the working oil discharged from the cavity II is regenerated to the cavity I through a regeneration oil path and/or is circulated to the regeneration cut-off oil path through the control valve I so as to be conveyed to other destinations; when the two control valves are located at the second working position, the two hydraulic pumps are converged into the cavity II to supply oil, and the hydraulic oil discharged from the cavity I can return oil through the two control valves.

through setting up control valve I, control valve II and two working oil circuit, can realize that two hydraulic pumps confluence are cavity II or I fuel feeding of cavity, and the hydraulic oil that cavity I was let out can directly get back to back oil tank through the control valve, realizes no back pressure oil return, fuel consumption and pressure loss are reduced.

further, the control valve i is replaced by a control valve iii, the control valve iii includes a pressure port P3, an oil return port T3 and two working ports a3 and b3, the pressure port P3 is communicated with a pump outlet of the hydraulic pump ip 1, the oil return port T3 is communicated with the oil return tank T, and the two working ports a3 and b3 are respectively communicated with the first working oil path and the second working oil path.

When the control valve III and the control valve II are both positioned at the first working position, the two hydraulic pumps are converged to supply oil to the cavity I, and the working oil discharged from the cavity II is regenerated to the cavity I through a regeneration oil way or is conveyed to other destinations through a regeneration cut-off oil way; when the control valve III and the control valve II are both located at the second working position, the two hydraulic pumps are converged to supply oil to the cavity II, and hydraulic oil discharged from the cavity I can return oil through the control valve III and the control valve II.

further, the regeneration shutoff oil passage communicates with the second hydraulic oil passage.

Based on the technical scheme, the invention can realize the following technical effects:

1. According to the hydraulic system of the working device, the regeneration oil path and the regeneration cut-off oil path are arranged, the regeneration valve is arranged on the regeneration oil path, the regeneration cut-off valve is arranged on the regeneration cut-off oil path, the working oil discharged from the cavity II flows to the cavity I through the regeneration oil path, so that the regeneration is realized, and the working condition of the regeneration oil path is controlled by the regeneration valve; when cavity I need not the regeneration oil, the regeneration oil can cut off the oil circuit through the regeneration to other destinations. Compared with the prior art, the regeneration valve and the regeneration cut-off valve are separately arranged and control the corresponding oil way, and are not required to be integrated on a control valve of a hydraulic pump, so that the regeneration and regeneration cut-off control is simplified, and the pressure is reduced; the regeneration cut-off valve is controlled by a slide valve, and the valve core is driven to move by adopting hydraulic control, electric control or other modes to control the regeneration flow and the oil return flow, so that the accurate control of the regeneration amount and the oil return amount can be achieved. The responsiveness and controllability of regeneration are improved. Meanwhile, regeneration is independently controlled, so that a regeneration oil path is simplified, and oil consumption is reduced;

2. according to the hydraulic system of the working device, the oil way is reasonably arranged, two hydraulic pumps can be converged into a cavity II and a cavity I of the actuator to supply oil, and the response is fast; when the two hydraulic pumps are converged to supply oil to the cavity I, working oil discharged from the cavity II can be regenerated to the cavity I as regenerated oil under the action of potential energy, so that the confluence of the two hydraulic pumps and the regenerated oil is realized; when regeneration confluence is not needed, working oil discharged from the cavity II can be directly conveyed to other destinations through a regeneration cut-off oil way or conveyed to other destinations through the regeneration cut-off oil way after passing through the control valve I; when two hydraulic pumps are converged to supply oil to the cavity II, oil drainage of the cavity I directly returns oil through two control valves for controlling the two hydraulic pumps, so that back pressure-free oil return is realized, and oil consumption and pressure loss are reduced. In addition, the regeneration cut-off valve can be set to be a valve with any opening, so that in the regeneration confluence process, part of the regenerated oil can return through the regeneration cut-off oil way by controlling the opening of the regeneration cut-off valve, and further the oil flux of the regenerated oil to the cavity I is controlled, the oil flux of the regenerated oil to the cavity I can be controlled only by adjusting the oil flux of the regeneration cut-off oil way in the adjustment process, and the adjustment process is simple and controllable;

3. The hydraulic system of the working device can realize the functions of confluence oil supply, regeneration cut-off and main valve element oil return under the condition of using less hydraulic valves, and can realize independent accurate control of regeneration and regeneration cut-off.

Drawings

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

FIG. 2 is a traveling diagram of an oil path when the regenerative confluence of the hydraulic system of the first embodiment is used for supplying oil to the cavity I;

FIG. 3 is a schematic diagram of the oil path when the hydraulic system of the first embodiment is cut off to supply oil to the cavity I in a regeneration mode;

FIG. 4 is a direction diagram of an oil path when the hydraulic system of the first embodiment merges into the cavity II for supplying oil;

FIG. 5 is a schematic illustration of a hydraulic system according to a second embodiment of the present invention;

FIG. 6 is a traveling diagram of an oil path when the regenerative confluence of the hydraulic system of the second embodiment is used for supplying oil to the cavity I;

FIG. 7 is a schematic diagram of the oil path during the regeneration and cut-off of the hydraulic system of the second embodiment to supply oil to the cavity I;

FIG. 8 is a direction diagram of the oil path when the hydraulic system of the second embodiment merges into the cavity II for supplying oil;

In the figure: 1-regeneration oil circuit; 11-a regeneration valve group; 111-opening and closing valves; 112-a one-way valve; 2-regenerating and cutting off an oil way; 21-a regeneration cut-off valve; 31-a first pumping circuit; 32-second pumping oil circuit; 41-control valve I; 42-control valve II; 43-control valve III; 5-a first working oil path; 6-a second working oil way; 61-control valve IV; 7-an actuator; 71-Cavity I; 72-Chamber II; the non-closed arrow indicates the oil inlet trend; the closed arrow indicates the drainage direction.

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.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

in the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.