CN111910708A - Excavator bucket rod hydraulic system, excavator and method - Google Patents
Excavator bucket rod hydraulic system, excavator and method Download PDFInfo
- Publication number
- CN111910708A CN111910708A CN202010928082.1A CN202010928082A CN111910708A CN 111910708 A CN111910708 A CN 111910708A CN 202010928082 A CN202010928082 A CN 202010928082A CN 111910708 A CN111910708 A CN 111910708A
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- Prior art keywords
- oil
- valve
- excavator
- hydraulic system
- control valve
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a bucket rod hydraulic system of an excavator, the excavator and a method, and the bucket rod hydraulic system comprises a bucket rod oil cylinder, wherein a rod cavity and a rodless cavity of the bucket rod oil cylinder are both connected with a main valve group through pipelines, the main valve group is connected with a main pump, the main pump is connected with an oil tank, the main pump can drive hydraulic oil in the oil tank to enter the bucket rod oil cylinder through the main valve group, the main valve group is also connected with an oil return pipe provided with a back pressure valve, the oil return pipe is connected with the oil tank, a bypass oil pipe is arranged between the pipeline between the rodless cavity and the main valve group and the oil return pipe between the back pressure valve and the oil tank, and the bypass oil pipe is provided with a switching valve.
Description
Technical Field
The invention relates to the technical field of excavators, in particular to a bucket rod hydraulic system of an excavator, the excavator and a method.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, in order to ensure that a motor does not suck air when the rotation operation is stopped, a back pressure valve is additionally arranged in a system loop to establish back pressure, and oil can be supplemented when the motor sucks air, so that oil returned by a rod cavity of a bucket rod oil cylinder passes through a valve core and then returns to a radiator and a hydraulic oil tank through the system back pressure valve.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a bucket rod hydraulic system of an excavator, which reduces the pressure loss during large-cavity oil return and improves the operation efficiency of the excavator. .
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides an excavator bucket rod hydraulic system, which includes a bucket rod cylinder, a rod cavity and a rodless cavity of the bucket rod cylinder are both connected to a main valve set through a pipeline, the main valve set is connected to a main pump, the main pump is connected to an oil tank, the main pump can drive hydraulic oil in the oil tank to enter the bucket rod cylinder through the main valve set, the main valve set is further connected to an oil return pipe provided with a back pressure valve, the oil return pipe is connected to the oil tank, a bypass oil pipe is arranged between the pipeline between the rodless cavity and the main valve set and the oil return pipe between the back pressure valve and the oil tank, and a switching valve is.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, and the switching valve employs a two-position three-way valve.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a radiator is mounted on the oil return pipe.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, where the main valve set includes a first control valve and a second control valve, the first control valve and the second control valve are both connected to a rod cavity and a rodless cavity of the arm cylinder and a main pump, the main pump can drive hydraulic oil in the oil tank to enter the rod cavity and the rodless cavity of the arm cylinder through the first control valve and the second control valve, the first control valve and the second control valve are both connected to the oil tank through an oil return pipe, and hydraulic oil in the arm cylinder can flow back to the oil tank through the first control valve, the second control valve and the oil return pipe.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, where the first control valve is a three-position six-way valve, and the first control valve is connected to the rod chamber through a pipeline with a rod chamber, connected to the rodless chamber through a pipeline without a rod chamber, and connected to the main pump through a first oil inlet pipeline.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, and the first oil inlet pipe is mounted with a first check valve.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, and the second control valve is a three-position seven-way valve, and is connected to the rod chamber through a pipeline of the rod chamber, connected to the rodless chamber through a pipeline of the rodless chamber, and connected to the main pump through a second oil inlet pipe.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, and the second oil inlet pipe is mounted with a second check valve.
In a second aspect, embodiments of the present invention provide an excavator, to which the excavator stick hydraulic system is mounted.
In a third aspect, an embodiment of the present invention provides a method for operating an excavator arm hydraulic system, where hydraulic oil in a rodless cavity of an arm cylinder flows out, a portion of the hydraulic oil enters an oil return pipe through a main valve set, flows back to an oil tank after passing through a back pressure valve, and another portion of the hydraulic oil flows into the oil return pipe after bypassing the back pressure valve through a switching valve and then flows into the oil tank.
The invention has the beneficial effects that:
according to the excavator bucket rod hydraulic system, the switching valve is arranged, so that part of hydraulic oil enters the switching valve when the rodless cavity of the bucket rod oil cylinder returns oil, and flows into the oil tank by bypassing the backpressure valve through the switching valve, the pressure loss of the rodless cavity returning oil of bucket rod discharging is reduced, the operation efficiency is improved, and the energy consumption is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;
the hydraulic control system comprises a piston, a piston rod, a main pump, an oil tank, a back pressure valve, a radiator, a first control valve, a second control valve, a rod cavity pipeline, a back pressure valve, a radiator, a first control valve, a second control valve, a rod cavity pipeline, a return oil pipe, an oil return pipe, a first oil inlet pipe, a first check valve, a second oil inlet pipe, a second check valve, a bypass oil pipe.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
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.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Just as the introduction of background art, when current dipper hydro-cylinder rodless chamber returns oil, hydraulic oil flows back to the oil tank through the back pressure valve, has certain loss of pressure, has reduced the operating efficiency of excavator, and this application provides an excavator dipper hydraulic system.
In example 1 of an exemplary embodiment of the present application, as shown in fig. 1, an excavator arm hydraulic system includes an arm cylinder, a main valve group, a main pump, an oil tank, a back pressure valve, a radiator, a switching valve, and the like.
The bucket rod oil cylinder comprises a cylinder body, a piston 3 is arranged in the cylinder body, the piston is connected with a piston rod 4, the piston divides the cylinder body of the bucket rod oil cylinder into a rod cavity 1 and a rodless cavity 2, the rod cavity and the rodless cavity are connected with a main valve group through pipelines, the main valve group is connected with a main pump 5, the main pump is connected with an oil tank 6, the main pump can drive hydraulic oil in the oil tank to enter the rod cavity or the rodless cavity of the bucket rod oil cylinder through the main valve group, so that the movement of the piston and the piston rod is controlled, the bucket rod of the excavator is driven to work, the main valve group is also connected with the oil tank through an oil return pipe, when oil enters one cavity of the bucket rod oil cylinder, hydraulic oil in the other cavity can enter the oil return.
And a back pressure valve 7 and a radiator 8 are arranged on the oil return pipe, the back pressure valve is used for generating back pressure, so that the motor does not suck air when the rotation operation of the excavator stops, and the radiator is used for cooling the hydraulic oil flowing back to the oil return tank.
The main valve group comprises a first control valve 9 and a second control valve 10, the first control valve and the second control valve are connected with a rod cavity and a rodless cavity of the bucket rod oil cylinder and connected with a main pump, the main pump can drive hydraulic oil in the oil tank to enter the rod cavity and the rodless cavity of the bucket rod oil cylinder through the first control valve and the second control valve, the first control valve and the second control valve are connected with the oil tank through oil return pipes, and the hydraulic oil in the bucket rod oil cylinder can flow back to the oil tank through the first control valve, the second control valve and the oil return pipes 13.
In this embodiment, the first control valve adopts a three-position six-way valve, the three-position six-way valve is connected with a rod cavity of the bucket rod oil cylinder through a rod cavity pipeline 11, the three-position six-way valve is connected with a rodless cavity of the bucket rod oil cylinder through a rodless cavity pipeline 12, the three-position six-way valve is further connected with an oil tank through an oil return pipe, the three-position six-way valve is connected with a main pump through a first oil inlet pipe 14, a first check valve 15 is installed on the first oil inlet pipe, and the first check valve enables hydraulic oil in the first oil inlet pipe to flow to the first control valve only through the main pump.
In this embodiment, the second control valve is a three-position seven-way valve, the three-position seven-way valve is connected with a rod cavity of the arm cylinder through a rod cavity pipeline, the three-position seven-way valve is connected with a rodless cavity of the arm cylinder through a rodless cavity pipeline, the three-position seven-way valve is further connected with an oil tank through an oil return pipe, the three-position seven-way valve is connected with a main pump through a second oil inlet pipe 16, a second one-way valve 17 is installed on the second oil inlet pipe, and the second one-way valve enables hydraulic oil in the second oil inlet pipe to flow to the second control valve only through the main pump.
A bypass oil pipe 18 is arranged between the rodless cavity pipeline 12 and an oil return pipe between the back pressure valve and the oil tank, a switching valve 19 is installed on the bypass oil pipe, in the embodiment, the switching valve adopts a two-position three-way valve, hydraulic oil cannot pass through the switching valve due to plugging of a port B during left-position work, the switching valve plugs the bypass oil pipe, and hydraulic oil in the rodless cavity pipeline can enter the bypass oil pipe and flow out of the switching valve through the port P and the port A during right-position work, and then flows into a return pipe through the bypass oil pipe.
In this embodiment, a radiator is arranged between the connection position of the bypass oil pipe and the oil return pipe and the oil tank, so that hydraulic oil bypassing the back pressure valve and flowing into the oil return pipe can be cooled.
Example 2:
in the present embodiment, the excavator according to embodiment 1 is mounted with the excavator arm hydraulic system, and other structures of the excavator adopt the structures of the existing excavator, and the detailed description thereof will not be given here.
Example 3:
the embodiment discloses a working method of the excavator arm hydraulic system in embodiment 1:
when the bucket rod discharges, the bucket rod discharging pilot pressure ports XAa1 and XAa2 drive the first control valve and the second control valve to be switched to the left position for work and drive the switching valve to be switched to the right position for work after pilot pressure signals are obtained, the bucket rod discharging pilot pressure ports XAa1 and XAa2 and the control port of the switching valve 19 are connected through pilot hoses, pilot pressure is simultaneously established to enable the switching valve to be switched to the right position for work, a main pump drives hydraulic oil to respectively enter a first oil inlet pipe and a second oil inlet pipe, the hydraulic oil enters the first control valve and the second control valve after passing through the first check valve and the second check valve, and flows into the rod cavity 1 of the bucket rod oil cylinder through the Aa port of the main valve group after flowing out through the first control valve and the second control valve, at the moment, the volume of the rod cavity is increased, the volume of the rodless cavity 2 is reduced, the hydraulic oil in the rodless cavity flows out, and the flowing hydraulic oil enters the rodless cavity pipeline, one part of hydraulic oil enters the first control valve and the second control valve through the Ba port of the main valve group, flows into the return pipe through the first control valve and the second control valve, flows out through the T port of the main valve group, flows back to the oil tank after passing through the backpressure valve and the radiator, the other part of hydraulic oil enters the switching valve, flows into the switching valve from the P port of the switching valve, flows out of the switching valve through the A port, flows into the return pipe through the bypass oil pipe, and directly flows into the return pipe without passing through the backpressure valve and then flows back to the oil tank.
When the bucket rod is unloaded, because the hydraulic oil part that no pole chamber flows into bypass oil pipe, flows into the oil tank after walking around the back pressure valve, has avoided the loss of pressure that the back pressure valve caused to reduce the loss of pressure of oil return, improved the operating efficiency, reduced the energy consumption.
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 (10)
1. The utility model provides an excavator dipper hydraulic system, a serial communication port, including the dipper hydro-cylinder, the pole chamber and the no pole chamber of dipper hydro-cylinder all pass through pipeline and main valve group link, main valve group is connected with the main pump, the main pump is connected with the oil tank, the main pump can drive hydraulic oil in the oil tank and get into the dipper hydro-cylinder through main valve group, main valve group still with install the oil return union coupling of back pressure valve, it is connected with the oil tank to return the oil pipe, no pole chamber, pipeline and back pressure valve between the main valve group, be provided with bypass oil pipe between the oil tank, bypass oil pipe installs the diverter valve.
2. The excavator stick hydraulic system of claim 1, wherein the switching valve is a two-position three-way valve.
3. The excavator stick hydraulic system of claim 1, wherein the oil return pipe has a radiator mounted thereon.
4. The excavator stick hydraulic system of claim 1, wherein the main valve assembly comprises a first control valve and a second control valve, the first control valve and the second control valve are connected with the rod cavity and the rodless cavity of the stick cylinder and the main pump, and the first control valve and the second control valve are connected with the oil tank through an oil return pipe.
5. The excavator stick hydraulic system of claim 4, wherein the first control valve is a three-position, six-way valve, the first control valve being connected to the rod chamber by a rod chamber line, to the rodless chamber by a rodless chamber line, and to the main pump by a first oil feed line.
6. The excavator stick hydraulic system of claim 5, wherein the first oil inlet pipe is fitted with a first check valve.
7. The excavator stick hydraulic system of claim 4, wherein the second control valve is a three-position seven-way valve and is connected to the rod chamber via a rod chamber line, to the rodless chamber via a rodless chamber line and to the main pump via a second oil inlet pipe.
8. The excavator stick hydraulic system of claim 7, wherein the second oil inlet pipe is fitted with a second check valve.
9. An excavator, characterized in that an excavator stick hydraulic system as claimed in any one of claims 1 to 8 is installed.
10. The method of operating the hydraulic system of the excavator stick of any one of claims 1 to 8, wherein the hydraulic oil in the rodless chamber of the stick cylinder flows out, a part of the hydraulic oil flows into the oil return pipe through the main valve block, flows back to the oil tank through the back pressure valve, and the other part of the hydraulic oil flows into the oil return pipe after bypassing the back pressure valve through the switching valve and then flows into the oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010928082.1A CN111910708A (en) | 2020-09-07 | 2020-09-07 | Excavator bucket rod hydraulic system, excavator and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010928082.1A CN111910708A (en) | 2020-09-07 | 2020-09-07 | Excavator bucket rod hydraulic system, excavator and method |
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| Publication Number | Publication Date |
|---|---|
| CN111910708A true CN111910708A (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010928082.1A Pending CN111910708A (en) | 2020-09-07 | 2020-09-07 | Excavator bucket rod hydraulic system, excavator and method |
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| Country | Link |
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| CN (1) | CN111910708A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112681445A (en) * | 2020-12-15 | 2021-04-20 | 中联重科土方机械有限公司 | Oil return control system and excavator |
| CN114321044A (en) * | 2021-12-31 | 2022-04-12 | 潍柴动力股份有限公司 | Bucket rod control valve structure and excavator |
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| JP2002339904A (en) * | 2001-05-21 | 2002-11-27 | Komatsu Ltd | Hydraulic circuit for construction machine |
| CN1676785A (en) * | 2004-03-31 | 2005-10-05 | 神钢建设机械株式会社 | Hydraulic control device and construction machine |
| CN103184752A (en) * | 2011-12-28 | 2013-07-03 | 神钢建设机械株式会社 | Hydraulic circuit for construction machine |
| CN105178381A (en) * | 2014-06-09 | 2015-12-23 | 神钢建机株式会社 | Construction machine |
| CN205742337U (en) * | 2016-01-18 | 2016-11-30 | 山河智能装备股份有限公司 | A kind of hydraulic crawler excavator fluid Regeneration control loop |
-
2020
- 2020-09-07 CN CN202010928082.1A patent/CN111910708A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002339904A (en) * | 2001-05-21 | 2002-11-27 | Komatsu Ltd | Hydraulic circuit for construction machine |
| CN1676785A (en) * | 2004-03-31 | 2005-10-05 | 神钢建设机械株式会社 | Hydraulic control device and construction machine |
| CN103184752A (en) * | 2011-12-28 | 2013-07-03 | 神钢建设机械株式会社 | Hydraulic circuit for construction machine |
| CN105178381A (en) * | 2014-06-09 | 2015-12-23 | 神钢建机株式会社 | Construction machine |
| CN205742337U (en) * | 2016-01-18 | 2016-11-30 | 山河智能装备股份有限公司 | A kind of hydraulic crawler excavator fluid Regeneration control loop |
Non-Patent Citations (1)
| Title |
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| 张兴国: "《液压与气压传动》", 31 January 2017 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112681445A (en) * | 2020-12-15 | 2021-04-20 | 中联重科土方机械有限公司 | Oil return control system and excavator |
| CN114321044A (en) * | 2021-12-31 | 2022-04-12 | 潍柴动力股份有限公司 | Bucket rod control valve structure and excavator |
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Application publication date: 20201110 |