CN215801937U - Fixed-variable hydraulic system of loader - Google Patents
Fixed-variable hydraulic system of loader Download PDFInfo
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- CN215801937U CN215801937U CN202122189133.6U CN202122189133U CN215801937U CN 215801937 U CN215801937 U CN 215801937U CN 202122189133 U CN202122189133 U CN 202122189133U CN 215801937 U CN215801937 U CN 215801937U
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Abstract
The utility model discloses a fixed variable hydraulic system of a loader, which comprises: the variable displacement pump, the priority valve, the working pump, the closed core multi-way valve and the equal-difference overflow valve. Wherein: the oil outlet of the variable pump is connected with the oil inlet of the priority valve, and the oil outlet of the priority valve is connected with the oil inlet of the closed core multi-way valve after being merged into the oil outlet pipe of the working pump. And the equal-difference overflow valve is connected with an oil outlet pipe of the working pump. The hydraulic system of the utility model removes a sequence valve and adds an equal-difference overflow valve on the basis of the prior art, and changes an open-core multi-way valve into a closed-core multi-way valve. When the required flow of the core-closing multi-way valve is smaller than the oil supply flow of the working pump, the variable pump automatically changes to the minimum flow, and when the required flow of the core-closing multi-way valve is larger than the oil supply flow of the working pump, the sum of the variable displacement of the variable pump and the flow of the working pump is equal to the required flow of the working device, so that the purpose of changing the displacement of the hydraulic pump according to the required flow of the working state is achieved, the heat productivity of a system is reduced, and more energy is saved.
Description
Technical Field
The utility model relates to the technical field of loader hydraulic systems, in particular to a loader constant-variable hydraulic system.
Background
The information disclosed in this background of the utility model is only for enhancement of understanding of the general background of the utility model and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
The existing single-variable hydraulic system of the loader is an open core multi-way valve (refer to the attached figure 1 of the specification), when a working device of the loader works, the pressure P2 at an oil outlet of a working pump 3 is greater than the set pressure of a sequence valve 8, the sequence valve 8 is opened, the oil (in the maximum displacement state) discharged by a variable pump 1 passes through a priority valve 2, and then enters the sequence valve 8 and enters the open core multi-way valve 9 together with the oil coming from the working pump 3; if the working device is in micro-control operation, redundant flow overflows to an oil return tank through an internal oil circuit of the open-core multi-way valve 9.
However, the applicant found in the course of using the loader univariate hydraulic system described above that: (1) the loader is often in a micro-control operation state, for example, when the shovel work condition is in micro-control operation, the actual hydraulic system does not need the maximum flow, the variable pump always works at the maximum displacement, and the redundant flow of the variable pump overflows through the multi-way valve to cause energy loss, so that the power consumption of the hydraulic system is large and the heating value is high. (2) The combined actions of lifting and tipping can not be carried out during the shoveling operation, thus affecting the operation efficiency. (3) The open core multi-way valve is a six-way valve, and the controllability of the handle is influenced by load change.
SUMMERY OF THE UTILITY MODEL
The utility model provides a fixed variable hydraulic system of a loader, which can change the discharge capacity of hydraulic oil according to the flow required by the working state when the loader performs micro-control operation, reduce the heat productivity of the system and save more energy. In order to achieve the above object, the technical solution of the present invention is as follows.
A loader fixed variable hydraulic system comprising: the variable displacement pump, the priority valve, the working pump, the closed core multi-way valve and the equal-difference overflow valve. Wherein: the oil outlet of the variable pump is connected with the oil inlet of the priority valve, and the oil outlet of the priority valve is connected with the oil inlet of the closed core multi-way valve after being merged into the oil outlet pipe of the working pump. And when the flow of the hydraulic oil required by the closed core multi-way valve is less than the oil supply amount of the working pump, the redundant hydraulic oil in the working pump is discharged through the equal-difference overflow valve.
Furthermore, the displacement controller of the variable displacement pump is connected with a flow monitoring device, and the flow monitoring device is arranged on an oil outlet pipeline of the core-closing multi-way valve so as to monitor the required oil supply amount in real time.
Furthermore, the variable pump, the working pump and the equal-difference overflow valve are all connected with the oil tank.
Furthermore, the oil outlet of the core-closing multi-way valve is connected with a lifting oil cylinder, a rotating bucket oil cylinder, a working pump oil outlet pipeline, a priority valve oil outlet pipeline and the like of the loader.
And when the loader turns, the oil discharged from the priority valve enters the flow amplifying valve and then enters the steering oil cylinder to realize the steering function of the vehicle.
And one end of the shuttle valve is connected with the flow amplifying valve and the LS port of the priority valve, and the other end of the shuttle valve is connected with the LS port of the closed-core multi-way valve.
Compared with the prior art, the utility model has the following beneficial effects: the loader fixed variable hydraulic system of the utility model is based on the existing single variable hydraulic system, removes the sequence valve and adds the equal-difference overflow valve, changes the core-opening multi-way valve into the core-closing multi-way valve/core-closing multi-way valve, and changes the supply route of the hydraulic oil by changing the connection relation among the variable pump, the priority valve, the working pump, the core-closing multi-way valve and the equal-difference overflow valve, so that when the flow of the hydraulic oil required by the core-closing multi-way valve is less than the oil supply of the working pump, the redundant hydraulic oil in the working pump is discharged through the equal-difference overflow valve, and when the flow of the hydraulic oil required by the core-closing multi-way valve is more than the oil supply of the working pump, the variable pump automatically changes the displacement to adapt to the flow requirement of the core-closing multi-way valve, reduces the heat productivity of the system, and saves more energy. In addition, the core-closing multi-way valve has a pressure compensation function, and the control performance of the handle is improved. The combined actions of lifting and tipping can be carried out during the digging operation, and the working efficiency is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
Fig. 1 is a schematic structural diagram of a single variable hydraulic system of a prior art loader.
FIG. 2 is a schematic structural diagram of a constant-variable hydraulic system of the loader in the embodiment.
The labels in the figures represent: 1-variable pump, 2-priority valve, 3-working pump, 4-core-closing multi-way valve, 5-differential overflow valve, 6-flow amplification valve, 7-shuttle valve, 8-sequence valve and 9-core-opening multi-way valve.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate that the directions of movement are consistent with those of the drawings, and do not limit the structure, but merely facilitate the description of the utility model and simplify the description, rather than indicate or imply that the referenced device or element needs to have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. The description will be further described with reference to the drawings and specific examples.
Referring to fig. 2, an example loader fixed variable hydraulic system includes: the variable displacement pump comprises a variable displacement pump 1, a priority valve 2, a working pump 3, a core-closing multi-way valve 4 and an equal-difference overflow valve 5. Wherein:
the oil inlet of the variable pump 1 is connected with the oil tank through an oil pipe, and the oil outlet of the variable pump 1 is connected with the oil inlet of the priority valve 2 through an oil pipe. An oil inlet of the working pump 3 is connected with an oil tank through an oil pipe, and an oil outlet of the working pump 3 is connected with an oil inlet of the closed-core multi-way valve 4 through a pipeline. The oil outlet of the priority valve 2 is merged into the connecting pipeline of the working pump 3 and the core-closing multi-way valve 4 through a pipeline, so that the hydraulic oil from the priority valve 2 and the hydraulic oil of the working pump 3 are merged and enter the core-closing multi-way valve 4 to provide power. The core-closing multi-way valve 4 is connected with an oil outlet pipeline of a working pump 3 of the loader, an oil outlet pipeline of the priority valve 2, a lifting oil cylinder, a rotating bucket oil cylinder and the like of the loader.
The displacement controller of the variable pump 1 is connected with a flow monitoring device, and the flow monitoring device is arranged on an oil outlet pipeline of the core-closing multi-way valve 4, so that the oil supply amount required by the working device can be monitored in real time and fed back to the variable pump 1.
The oil tank, the equal-difference overflow valve 5 and the oil outlet pipe of the working pump 3 are sequentially connected, the variable pump 1 has the function of changing the displacement, when the flow required by the core-closing multi-way valve 4 is smaller than the oil supply flow of the working pump 3, the variable pump 1 automatically changes to the minimum flow, meanwhile, the redundant flow of the working pump overflows to the oil return tank through the constant-difference overflow valve, when the flow required by the core-closing multi-way valve 4 is larger than the oil supply flow of the working pump 3, the sum of the displacement and the flow of the working pump 3 is changed by the variable pump 1 to be equal to the flow required by the working device, the purpose of changing the displacement of hydraulic oil according to the flow required by the working state is achieved, the heat productivity of the system is reduced, and the energy is saved. In addition, the core-closing multi-way valve has a pressure compensation function, and the control performance of the handle is improved. The combined actions of lifting and tipping can be carried out during the digging operation, and the working efficiency is improved.
The loader constant-variable hydraulic system further comprises a flow amplifying valve 6 and a shuttle valve 7, the flow amplifying valve 6 is connected with the priority valve 2, and the flow amplifying valve 6 mainly has the function that when the loader turns, oil discharged from the priority valve 2 enters the flow amplifying valve 6 and then enters a steering oil cylinder to achieve the vehicle steering function. One end of the shuttle valve 7 is connected with the LS ports of the flow amplifying valve 6 and the priority valve 2, and the other end of the shuttle valve is connected with the LS port of the closed-core multi-way valve 4. The control system mainly has the function of comparing the high-pressure access LS ports of the steering system and the working device system and controlling the variable of the variable pump 1.
Finally, it should be understood that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (6)
1. A loader fixed variable hydraulic system, comprising: the variable pump, the priority valve, the working pump, the closed core multi-way valve and the equal-difference overflow valve; wherein: the oil outlet of the variable pump is connected with the oil inlet of the priority valve, and the oil outlet of the priority valve is merged into the oil outlet pipe of the working pump and then is connected with the oil inlet of the closed core multi-way valve; and the equal-difference overflow valve is connected with an oil outlet pipe of the working pump.
2. The loader fixed variable hydraulic system of claim 1, wherein the displacement controller of the variable pump is connected to a flow monitoring device disposed on the flowline of the closed-core multi-way valve.
3. The constant-variable hydraulic system of a loader as claimed in claim 1, wherein the variable pump, the working pump and the equal-difference relief valve are all connected with an oil tank.
4. The loader fixed-variable hydraulic system of claim 1, wherein the closed-core multi-way valve oil outlet is connected with a lifting cylinder, a rotating bucket cylinder, a working pump oil outlet pipeline and a priority valve oil outlet pipeline of a loader.
5. The loader fixed variable hydraulic system of any one of claims 1 to 4 further comprising a flow amplification valve connected to a priority valve.
6. The fixed-variable hydraulic system of a loader as claimed in claim 5 further comprising a shuttle valve connected at one end to the LS port of the LS and a flow amplification valve and at the other end to the LS port of the LS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122189133.6U CN215801937U (en) | 2021-09-10 | 2021-09-10 | Fixed-variable hydraulic system of loader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122189133.6U CN215801937U (en) | 2021-09-10 | 2021-09-10 | Fixed-variable hydraulic system of loader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215801937U true CN215801937U (en) | 2022-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122189133.6U Active CN215801937U (en) | 2021-09-10 | 2021-09-10 | Fixed-variable hydraulic system of loader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215801937U (en) |
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2021
- 2021-09-10 CN CN202122189133.6U patent/CN215801937U/en active Active
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