CN110158682B - Hydraulic system of land leveler working device - Google Patents
Hydraulic system of land leveler working device Download PDFInfo
- Publication number
- CN110158682B CN110158682B CN201910372932.1A CN201910372932A CN110158682B CN 110158682 B CN110158682 B CN 110158682B CN 201910372932 A CN201910372932 A CN 201910372932A CN 110158682 B CN110158682 B CN 110158682B
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- oil
- valve
- lifting
- swing
- oil cylinder
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/80—Component parts
- E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
- E02F3/844—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically
Abstract
The invention discloses a hydraulic system of a grader working device, belonging to the technical field of engineering machinery manufacturing, and the system comprises lifting oil cylinders for respectively lifting two sides of the grader working device and swing oil cylinders for driving the working device to swing to the left side and the right side of the grader; a lifting valve core is arranged between the lifting oil cylinder and the hydraulic pump; a swing valve core is arranged between the swing oil cylinder and the hydraulic pump; each lifting valve core is connected with a control valve through a respective shuttle valve and a stop valve, and a compensation valve is arranged between the control valve and the swing oil cylinder. The invention can solve the problems of poor adjustment accuracy of the scraper knife and low working efficiency of the existing grader.
Description
Technical Field
The invention relates to the technical field of engineering machinery manufacturing, in particular to a hydraulic system of a land leveler working device.
Background
A hydraulic system of a grader working device is a device for adjusting the position and the action of working devices such as a scraper blade of the grader and the like so as to finish the ground leveling work of the grader, and comprises lifting oil cylinders for respectively lifting two sides of the working device of the grader and swing oil cylinders for driving the working devices to swing towards the left side and the right side of the grader; the lifting oil cylinders are respectively and vertically fixed on two sides of the rear end of the front frame of the land leveler, and the extending ends of the lifting oil cylinders are respectively and fixedly connected with two sides of the working device; the swing oil cylinder is obliquely arranged between the working device and the front frame; a scraper knife of the land leveler is fixed at the bottom end of the working device; the front end of the working device is connected with a front frame of the land leveler through a ball head; the lifting oil cylinder and the swinging oil cylinder both provide pressure oil through a hydraulic pump; lifting valve cores are respectively arranged between the hydraulic pump and the lifting oil cylinder; a swing valve core is arranged between the hydraulic pump and the swing oil cylinder, and the control end of the lifting valve core and the control end of the swing valve core are respectively connected with a multi-way valve handle. When the scraper is in work, the multi-way valve handle controls the independent action of each oil cylinder to realize the adjustment of the position of the scraper knife and finish the leveling of the ground. However, in practical application, because the swing system is independent and does not act with the actions of other cylinders, when the lifting cylinder located on one side of the front frame and the working device acts, the working device drives the scraper knife to do certain circular arc motion around the fixed point of the swing cylinder on the front frame due to the fixed action of the swing cylinder, so that the action direction of the lifting cylinder on the side is changed, and the lifting cylinder on the other side is also swung at a certain angle, thereby causing the positions and angles of two ends of the scraper knife to change, causing the height of the scraper knife not to be adjusted in place at one time, the adjustment action to be slow and the adjustment accuracy to be poor; meanwhile, due to the fixing effect of the swing oil cylinder, the scraper knife can move towards one side of the whole machine when the lifting oil cylinder is adjusted, and when the adjusting position of the lifting oil cylinder is large, the scraper knife can move towards one side of the whole machine more, so that the operation visual field is limited, the scraper knife needs to return by adjusting other oil cylinders, the adjustment is inconvenient, and the problem of low working efficiency is caused.
Disclosure of Invention
The invention provides a hydraulic system of a grader working device, which can solve the problems of poor regulation accuracy of a scraper blade and low working efficiency of the existing grader.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the hydraulic system of the working device of the land scraper comprises lifting oil cylinders for respectively lifting two sides of the working device of the land scraper and swing oil cylinders for driving the working device to swing to the left side and the right side of the land scraper; a lifting valve core is arranged between the lifting oil cylinder and the hydraulic pump; a swing valve core is arranged between the swing oil cylinder and the hydraulic pump; each lifting valve core is connected with a control valve through a respective shuttle valve and a one-way valve, and a compensation valve is arranged between the control valve and the swing oil cylinder.
In the above technical solution, a more specific technical solution may also be: a first oil inlet and a second oil inlet of each shuttle valve are respectively connected with a first working oil port and a second working oil port of the lifting valve core; an oil outlet of each shuttle valve is connected with an oil inlet of the corresponding one-way valve, an oil outlet of each one-way valve is connected with an oil inlet of the corresponding control valve, and an oil outlet of the corresponding control valve is connected with a control end of the corresponding compensation valve; the compensation valve is provided with a first oil port, a second oil port and a third oil port; the first oil port is connected with a rodless cavity of the swing oil cylinder, the second oil port is connected with a rod cavity of the swing oil cylinder, and the third oil port is connected with an oil tank.
Further: a bidirectional balance valve is arranged between the lifting valve core and the lifting oil cylinder; and a bidirectional hydraulic lock is arranged between the swing valve core and the swing oil cylinder.
Further: the number of the lifting oil cylinders is two, and the two lifting oil cylinders are respectively a left lifting oil cylinder and a right lifting oil cylinder.
Further: the hydraulic pump is a double hydraulic pump; one pump of the double hydraulic pumps provides pressure oil for the left lifting oil cylinder, and the other pump of the double hydraulic pumps provides pressure oil for the right lifting oil cylinder and the swing oil cylinder.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. because each lifting valve core of the hydraulic system of the working device is connected with the control valve through the respective shuttle valve and the one-way valve, a compensation valve is arranged between the control valve and the swing oil cylinder; the control valve can lead the swing oil cylinder to move along with the actions of the lifting oil cylinders which are respectively arranged at the two sides of the grader working device, thus not only leading the height of the scraper knife to be adjusted in place at one time, but also having high adjusting accuracy and improving the working efficiency.
2. Because a bidirectional balance valve is arranged between the lifting valve core and the lifting oil cylinder; a bidirectional hydraulic lock is arranged between the swing valve core and the swing oil cylinder; the function of stabilizing the system is achieved.
Drawings
FIG. 1 is a hydraulic schematic of an embodiment of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following examples:
the hydraulic system of the working device of the grader shown in fig. 1 includes lifting cylinders for respectively lifting both sides of the working device of the grader and swing cylinders for driving the working device to swing to both left and right sides of the grader; two lifting oil cylinders are provided, namely a left lifting oil cylinder 41 and a right lifting oil cylinder 42; the left lifting oil cylinder 41 and the right lifting oil cylinder 42 are both vertically arranged, the fixed end of the left lifting oil cylinder 41 is respectively connected with the left side of the rear end of a front frame (not shown) of the grader, and the telescopic end of the left lifting oil cylinder 41 is connected with the left side of the rear end of a working device (not shown) of the grader; the fixed end of the right lifting oil cylinder 42 is respectively connected with the right side of the rear end of a front frame (not shown) of the land leveler, and the telescopic end of the right lifting oil cylinder 42 is connected with the right side of the rear end of a working device (not shown) of the land leveler; the swing oil cylinder 9 is obliquely arranged between the working device and the front frame. The hydraulic pump 1 is a double hydraulic pump; one pump 11 of the dual hydraulic pumps supplies pressure oil to the left lift cylinder 41, and the other pump 12 of the dual hydraulic pump 1 supplies pressure oil to the right lift cylinder 42 and the swing cylinder 9. A lifting valve core is arranged between the lifting oil cylinder and the hydraulic pump 1, a lifting valve core 21 is arranged between the left lifting oil cylinder 41 and the hydraulic pump 1, and a lifting valve core 22 is arranged between the right lifting oil cylinder 42 and the hydraulic pump 1; a swing valve core 91 is arranged between the swing oil cylinder 9 and the hydraulic pump 1; two-way balance valves 3 are arranged between the lifting valve core 21 and the lifting valve core 22 and between the lifting oil cylinders; a bidirectional hydraulic lock 10 is arranged between the swing valve core 91 and the swing oil cylinder 9; the poppet 21 is connected to the control valve 7 through its shuttle valve 51 and check valve 61, and the poppet 22 is connected to the control valve 7 through its shuttle valve 52 and check valve 62; a compensating valve 8 is arranged between the control valve 7 and the swing oil cylinder 9. The first oil inlet 51P1 of the shuttle valve 51 is connected with the first working oil port a of the poppet 21, the second oil inlet 51P2 of the shuttle valve 51 is connected with the second working oil port b of the poppet 21, and the oil outlet 51O of the shuttle valve 51 is connected with the oil inlet of the check valve 61; a first oil inlet 52P1 of the shuttle valve 52 is connected with a first working oil port c of the poppet 22, a second oil inlet 52P2 of the shuttle valve 52 is connected with a second working oil port d of the poppet 22, an oil outlet 52O of the shuttle valve 52 is connected with an oil inlet of the check valve 62, an oil outlet of the check valve 61 and an oil outlet of the check valve 62 are connected with an oil inlet 7P of the control valve 7, and an oil outlet 7O of the control valve 7 is connected with a control end 8A of the compensation valve 8; the first oil port 8a of the compensation valve 8 is connected with a rodless cavity of the swing oil cylinder 9, the second oil port 8b of the compensation valve 8 is connected with a rod cavity of the swing oil cylinder 9, and the third oil port 8c of the compensation valve 8 is connected with an oil tank.
In the work, when controlling the action of lift cylinder, make control valve switch to the upper work simultaneously, the swing hydro-cylinder is in the follow-up state this moment, specifically as follows:
when the left lifting oil cylinder 41 is controlled to descend, the rodless cavity of the left lifting oil cylinder 41 is fed with oil, at the moment, under the action of pressure oil, the first oil inlet 51P1 and the oil outlet 51O of the shuttle valve 51 are communicated, at the moment, the pressure oil flows through the control valve 7 to the control end 8A of the compensation valve 8 through the check valve 61, the compensation valve 8 is pushed to move to the left position to work, at the moment, the first oil port 8A and the second oil port 8b of the compensation valve are communicated, the rodless cavity and the rod cavity of the swing oil cylinder 9 are communicated, the swing oil cylinder 9 moves along with the movement of the left lifting oil cylinder 41, and meanwhile, the swing oil cylinder 9 sucks oil from the oil tank through the third oil port 8c of the compensation valve 8 in the process of. The same is true when the right lift cylinder 42 is controlled to descend.
When the left lifting oil cylinder 41 is controlled to ascend, a rod cavity of the left lifting oil cylinder 41 is used for oil inlet, at the moment, under the action of pressure oil, a second oil inlet 51P2 and an oil outlet 51O of the shuttle valve 41 are communicated, at the moment, the pressure oil flows through the control valve 7 to a control end 8A of the compensation valve 8 through the check valve 61, the compensation valve 8 is pushed to move to the left position to work, at the moment, a first oil port 8A and a second oil port 8b of the compensation valve are communicated, a rodless cavity and a rod cavity of the swing oil cylinder 9 are communicated, the swing oil cylinder 9 moves along with the movement of the lifting oil cylinder 41, and meanwhile, the swing oil cylinder 9 sucks oil from an oil tank through a third oil port 8c of the compensation valve 8 in the process. The same is true when the right lifting oil cylinder 42 is controlled to ascend.
When the left lifting oil cylinder 41 and the right lifting oil cylinder 42 are controlled to act simultaneously, pressure oil flows from the control valve 7 to the control end 8A of the compensation valve 8 through the oil outlet 51O of the shuttle valve 51 and the oil outlet 52O of the shuttle valve 52 simultaneously, the compensation valve 8 is pushed to move to the left position to work, the first oil port 8A and the second oil port 8b of the compensation valve are communicated at the moment, the rodless cavity and the rod cavity of the swing oil cylinder are communicated, the swing oil cylinder 9 acts along with the action of the lifting oil cylinder, and meanwhile the swing oil cylinder sucks oil from the oil tank through the third oil port 8c of the compensation valve 8 in the process of following the action of the lifting oil cylinder to supplement the oil.
The invention not only can lead the height of the scraper knife to be adjusted in place at one time, but also has high adjustment accuracy and improves the working efficiency.
Claims (4)
1. A hydraulic system of a working device of a land leveler comprises lifting oil cylinders for respectively lifting two sides of the working device of the land leveler and swing oil cylinders for driving the working device to swing towards the left side and the right side of the land leveler; a lifting valve core is arranged between the lifting oil cylinder and the hydraulic pump; a swing valve core is arranged between the swing oil cylinder and the hydraulic pump; the method is characterized in that: each lifting valve core is connected with a control valve through a respective shuttle valve and a respective one-way valve, and a compensation valve is arranged between the control valve and the swing oil cylinder; a first oil inlet and a second oil inlet of each shuttle valve are respectively connected with a first working oil port and a second working oil port of the lifting valve core; an oil outlet of each shuttle valve is connected with an oil inlet of the corresponding one-way valve, an oil outlet of each one-way valve is connected with an oil inlet of the corresponding control valve, and an oil outlet of the corresponding control valve is connected with a control end of the corresponding compensation valve; the compensation valve is provided with a first oil port, a second oil port and a third oil port; the first oil port is connected with a rodless cavity of the swing oil cylinder, the second oil port is connected with a rod cavity of the swing oil cylinder, and the third oil port is connected with an oil tank; when the lifting oil cylinder acts, the first oil inlet or the second oil inlet of the shuttle valve is communicated with the oil outlet, pressure oil flows through the control valve to the control end of the compensation valve through the shuttle valve, the compensation valve is pushed to enable the first oil port to be communicated with the second oil port, at the moment, the rodless cavity and the rod cavity of the swing oil cylinder are communicated, and the swing oil cylinder acts along with the action of the lifting oil cylinder.
2. The grader work implement hydraulic system of claim 1, wherein: a bidirectional balance valve is arranged between the lifting valve core and the lifting oil cylinder; and a bidirectional hydraulic lock is arranged between the swing valve core and the swing oil cylinder.
3. The grader work implement hydraulic system of claim 2, wherein: the number of the lifting oil cylinders is two, and the two lifting oil cylinders are respectively a left lifting oil cylinder and a right lifting oil cylinder.
4. The grader work apparatus hydraulic system of claim 3, wherein: the hydraulic pump is a double hydraulic pump; one pump of the double hydraulic pumps provides pressure oil for the left lifting oil cylinder, and the other pump of the double hydraulic pumps provides pressure oil for the right lifting oil cylinder and the swing oil cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910372932.1A CN110158682B (en) | 2019-05-06 | 2019-05-06 | Hydraulic system of land leveler working device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910372932.1A CN110158682B (en) | 2019-05-06 | 2019-05-06 | Hydraulic system of land leveler working device |
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| CN110158682A CN110158682A (en) | 2019-08-23 |
| CN110158682B true CN110158682B (en) | 2021-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910372932.1A Active CN110158682B (en) | 2019-05-06 | 2019-05-06 | Hydraulic system of land leveler working device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002532643A (en) * | 1998-12-18 | 2002-10-02 | キャタピラー インコーポレイテッド | Method and apparatus for controlling a work implement |
| WO2014098284A1 (en) * | 2012-12-20 | 2014-06-26 | 볼보 컨스트럭션 이큅먼트 에이비 | Construction machine with floating function |
| CN103958939A (en) * | 2012-01-23 | 2014-07-30 | 株式会社小松制作所 | Motor grader |
| CN208024662U (en) * | 2018-03-15 | 2018-10-30 | 广西柳工机械股份有限公司 | Balanced valve and hydraulic system for lifting pacifically machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9059644B2 (en) * | 2009-07-21 | 2015-06-16 | Herbert S Kobayashi | Automatic blade leveler right tilt-left tilt-null control and method |
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2019
- 2019-05-06 CN CN201910372932.1A patent/CN110158682B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002532643A (en) * | 1998-12-18 | 2002-10-02 | キャタピラー インコーポレイテッド | Method and apparatus for controlling a work implement |
| CN103958939A (en) * | 2012-01-23 | 2014-07-30 | 株式会社小松制作所 | Motor grader |
| WO2014098284A1 (en) * | 2012-12-20 | 2014-06-26 | 볼보 컨스트럭션 이큅먼트 에이비 | Construction machine with floating function |
| CN208024662U (en) * | 2018-03-15 | 2018-10-30 | 广西柳工机械股份有限公司 | Balanced valve and hydraulic system for lifting pacifically machine |
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| CN110158682A (en) | 2019-08-23 |
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