CN108930679B - Synchronous valve for controlling harvester steering and header lifting - Google Patents
Synchronous valve for controlling harvester steering and header lifting Download PDFInfo
- Publication number
- CN108930679B CN108930679B CN201710387468.4A CN201710387468A CN108930679B CN 108930679 B CN108930679 B CN 108930679B CN 201710387468 A CN201710387468 A CN 201710387468A CN 108930679 B CN108930679 B CN 108930679B
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- steering
- oil
- header
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 13
- 239000002131 composite material Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D69/00—Driving mechanisms or parts thereof for harvesters or mowers
- A01D69/06—Gearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
- F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Lifting Devices For Agricultural Implements (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to the technical field of hydraulic control of a harvester, in particular to a synchronous valve for controlling the steering and the lifting of a header of the harvester, which comprises an oil source, a multifunctional slide valve, a header oil cylinder for controlling the lifting of the header, a left steering oil cylinder for controlling the left steering of the harvester, a right steering oil cylinder for controlling the right steering of the harvester and an oil return tank.
Description
Technical Field
The invention relates to the technical field of hydraulic control of a harvester, in particular to a synchronous valve for controlling the steering of the harvester and the lifting of a header.
Background
At present, most of lifting and steering of a cutting table of a crawler-type harvester are controlled by hydraulic pressure, and a cutting table lifting valve and a steering valve are connected in series, so that steering cannot be realized when the cutting table is lifted and steered, and lifting of the cutting table cannot be realized when the cutting table is steered. Under the condition that a user needs to lift the header and simultaneously turn around the corner at the end of the field, the speed is reduced.
Disclosure of Invention
In order to solve the problem that the harvester in the prior art cannot realize the steering and the lifting of the header at the same time, the invention provides a synchronous valve for controlling the steering and the lifting of the header of the harvester, which can realize the steering and the lifting of the header at the same time.
The technical scheme adopted for solving the technical problems is as follows:
The synchronous valve comprises an oil source, a multifunctional slide valve, a header oil cylinder for controlling the header to lift, a left steering oil cylinder for controlling the left steering of the harvester, a right steering oil cylinder for controlling the right steering of the harvester and an oil return oil tank, wherein the multifunctional slide valve comprises a header control valve, a steering control valve and a hydraulic control one-way valve connected in series with the header oil cylinder for controlling the header to lift;
The header control valve is a three-position five-way reversing valve, the header control valve comprises an A port, a B port, a P port, a T port and a T1 port, the A port is connected with an oil inlet of the hydraulic control one-way valve 25, the B port is connected with a control port of the hydraulic control one-way valve, the P port is connected with an oil source 1, the T port is connected with an oil return tank, when the header control valve is positioned in the middle position, the A port, the B port and the T port are all closed ports, the P port is communicated with the T1 port, when the header control valve is positioned in the left position, the A port is communicated with the P port, the T1 port is a closed port, when the header control valve is positioned in the right position, the A port is communicated with the T1 port, and the B port is a closed port;
The steering control valve is a five-position six-way reversing valve, the steering control valve comprises an A 'port, a B1 port, a P' port and a T 'port, the A' port is connected with a rodless cavity of a left steering cylinder, the B 'port is connected with a rodless cavity of a right steering cylinder, the B1 port is simultaneously connected with rod cavities of the left steering cylinder and the right steering cylinder, the left steering cylinder is communicated with the rod cavities of the right steering cylinder, the P1 port is connected with an oil source, the P' port is connected with a T '1 port of a header control valve, the T' port is connected with an oil return tank, and when the steering control valve is positioned at the middle position, the steering control valve is positioned at the left position, the A 'port, the P1 port and the P' port are communicated, the B 'port, the B1 port and the T' port are communicated, the steering control valve is positioned at the left position, the A 'port, the P1 port and the P' port are communicated, the B 'port and the T' port are communicated, the B1 port is a closed port, the B 'port, the P1 port and the P' port are communicated, the A 'port, the B1 port and the T' port are communicated, the steering control valve is positioned at the right position, the B 'port, the P1 port and the P' port are communicated, the A 'port and the T' port are communicated, and the B1 port is a closed port.
Further, when the steering control valve is positioned at the left position, a throttling groove is arranged between the port B1 and the port T'; when the steering control valve is positioned at the right position, a throttling groove is arranged between the B1 and the T'.
Further, the multifunctional slide valve further comprises a safety valve and an overflow valve, wherein the safety valve is positioned near the oil source, an oil inlet of the safety valve is connected with the oil source, an oil outlet of the safety valve is connected with an oil return tank, an oil inlet of the overflow valve is connected with an oil path between the P port and the T1 port, and an oil outlet of the overflow valve is connected with the oil tank.
Further, the opening pressure of the safety valve is 13.5MPa, and the opening pressure of the overflow valve is 7-8 MPa.
Furthermore, the multifunctional slide valve integrates the safety valve, the overflow valve, the header control valve, the steering control valve and the hydraulic control one-way valve into a whole.
The beneficial effects are that: the synchronous valve for controlling the harvester to turn and the header to lift can realize synchronous movement of the harvester to turn and the header to lift, thereby greatly saving time and improving the working efficiency of the harvester.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of a synchronizing valve for controlling the steering of a harvester and the lifting of a header prior to modification;
fig. 2 is a schematic diagram of a synchronous valve for controlling the steering of the harvester and the lifting of the header according to the invention.
Wherein, 1, oil source, 2, multifunctional slide valve, 23, header control valve, 231, header valve, 24, steering control valve, 241, steering valve, 25, a hydraulic control one-way valve, 3, a header oil cylinder, 4, a left steering oil cylinder, 5, a right steering oil cylinder, 6 and an oil return oil tank.
Detailed Description
As shown in fig. 1, the synchronous valve is used for controlling the steering of the harvester and the lifting of the header before improvement. The header valve 231 is a three-position four-way reversing valve, the header valve 231 comprises an A port, a B port, a P port and a T port, the steering valve 241 is a three-position five-way reversing valve, and the steering valve 241 comprises an A ' port, a B1 port, a P ' port and a T ' port. When the header valve 231 is in the middle position, the A and the B are closed ports, the P and the T are communicated, high-pressure oil of the oil source 1 reaches the P port of the header valve 231, and reaches the P' port of the steering valve through the T port, so that the steering circuit can work when the high-pressure oil is obtained; when the header valve 231 is at the left position, A is communicated with P, B is communicated with T, high-pressure oil reaches the rodless cavity of the header oil cylinder 3 only through P, A and the hydraulic control one-way valve 25, the P' port of the steering valve 241 does not obtain high-pressure oil, and the steering loop cannot work normally; when the header valve 231 is at the right position, the A is communicated with the T, the B is communicated with the P, and at the moment, high-pressure oil reaches the control port of the hydraulic control one-way valve 25 only through P, B, and the P' port of the steering valve 241 obtains the oil return of the rodless cavity of the header oil cylinder, but the pressure is smaller, the oil is insufficient, and the steering loop cannot work normally; in summary, only when the header valve 231 is in the middle position, the steering valve 241 of the steering circuit can obtain the high-pressure oil of the oil source 1 and can work normally, so that the harvester cannot steer when the header is lifted, and the working efficiency is affected.
As shown in fig. 2, the synchronous valve for controlling the steering of the harvester and the lifting of the header of the invention comprises an oil source, a multifunctional slide valve 2, a header oil cylinder 3 for controlling the lifting of the header, a left steering oil cylinder 4 for controlling the left steering of the harvester, a right steering oil cylinder 5 for controlling the right steering of the harvester and an oil return oil tank 61, wherein the multifunctional slide valve 2 comprises a header control valve 23, a steering control valve 24 and a hydraulic control one-way valve 25 connected with the header oil cylinder 3 for controlling the lifting of the header in series;
The header control valve 23 is a three-position five-way reversing valve, the header control valve 23 comprises an A port, a B port, a P port, a T port and a T1 port, the A port is connected with an oil inlet of the hydraulic control one-way valve 2525, the B port is connected with a control port of the hydraulic control one-way valve 25, the P port is connected with the oil source 1, the T port is connected with the oil return oil tank 61, when the header control valve 23 is positioned in the middle position, the A port, the B port and the T port are all closed ports, the P port is communicated with the T1 port, when the header control valve 23 is positioned in the left position, the A port is communicated with the P port, the B port is communicated with the T1 port, the T1 port is a closed port, and when the header control valve 23 is positioned in the right position, the A port is communicated with the T1 port, and the B port is a closed port;
The steering control valve 24 is a five-position six-way reversing valve, the steering control valve 24 comprises an A 'port, a B1 port, a P1 port and a T' port, the A 'port is connected with a rodless cavity of the left steering cylinder 4, the B' port is connected with a rodless cavity of the right steering cylinder 5, the B1 port is simultaneously connected with rod cavities of the left steering cylinder 4 and the right steering cylinder 5, the left steering cylinder 4 is communicated with the rod cavities of the right steering cylinder 5, the P1 port is connected with an oil source, the P 'port is connected with a T' port of the header control valve 23, the T 'port is connected with an oil return tank 61, when the steering control valve 24 is in a neutral position, the A' port, the B1 port, the P 'port and the T' port are communicated, the P1 port is a closed port, when the steering control valve 24 is in a left position, the A 'port, the P1 port, the B' port and the T 'port are communicated, and the B' port is a closed port when the steering control valve 24 is in a left position, and the B 'port is communicated with the T1 port, the B' port is communicated with the T 'port, the B' port 24 is communicated with the T 'port when the steering control valve is in a right position, the B' port is communicated with the T 'port, the B' port is communicated with the B port, and the B port is communicated with the port, and the B port is communicated with the port.
When the steering control valve 24 is positioned at the left position, a throttling groove is arranged between the port B1 and the port T'; when the steering control valve 24 is in the right position, a throttle groove is provided between B1 and T'.
The multifunctional slide valve 2 further comprises a safety valve and an overflow valve, wherein the safety valve is positioned near an oil source, an oil inlet of the safety valve is connected with the oil source, an oil outlet of the safety valve is connected with an oil return tank 61, an oil inlet of the overflow valve is connected with an oil path between a P port and a T1 port, and an oil outlet of the overflow valve is connected with the oil tank 1.
The opening pressure of the relief valve is 13.5MPa, and the opening pressure of the overflow valve is 7-8 MPa.
The multifunctional slide valve 2 integrates a safety valve, an overflow valve, a header control valve 23, a steering control valve 24 and a hydraulic control one-way valve 25 into a whole.
In this embodiment, the header cylinder 3 for controlling the lifting of the header includes two header cylinders connected in parallel.
The invention relates to a synchronous valve for controlling the steering of a harvester and the lifting of a header, which specifically introduces the following working principle:
The high-pressure oil of the oil source 1 can reach the P port of the header control valve 23 and the P1 port of the steering control valve 24 at the same time, and the header loop and the steering loop are not affected by each other and work normally. The relief valve 21 is in fact an overflow valve for ensuring that the pressure of the hydraulic system does not exceed 13.5MPa, and the overflow valve 22 is for ensuring that the operating pressure of the steering circuit is not higher than 7-8MPa, both overflow valves being settable.
When the header control valve 23 is in the middle position, P and T1 are communicated, high-pressure oil passes through P and T1 to reach the P' port of the steering control valve 24, and at the moment, all the high-pressure oil of the oil 1 enters the steering circuit, and the lifting circuit does not influence the steering circuit. When the header control valve 24 is in the left position, T1 is closed and no oil affects the steering circuit. The high-pressure oil enters the rodless cavity of the header oil cylinder 3 through the P port, the A port and the hydraulic control one-way valve 25, the header oil cylinder 3 is two parallel single-acting cylinders, and at the moment, the piston rod of the header oil cylinder extends out, and the header is lifted. When the header control valve 23 is in the right position, T1 is a closed port and no oil affects the steering circuit. The high-pressure oil liquid reaches the control port of the hydraulic control one-way valve 25 through the port P and the port B, at the moment, the hydraulic control one-way valve 25 is opened, the header oil cylinder 3 retracts a piston rod due to the dead weight of the header or other external force, and the rodless cavity oil liquid returns through the opened hydraulic control one-way valve 25 and returns to the oil tank through the port A and the port T. The function description of the three positions of the header control valve is integrated, and no matter the header steering valve is positioned at any position, the steering loop is not affected.
When the steering control valve 24 is in the middle position, the port A, the port B1, the port P and the port T are all communicated with the oil return tank 6, so that high-pressure oil liquid directly returns to the oil tank through the port P 'and the port T', and the steering oil cylinder does not act.
When the steering control valve 24 is in the left position, A ', P1 and P' are communicated, oil reaches the rodless cavity of the left steering cylinder 4, and the piston rod of the left steering cylinder 4 extends. The rod cavities of the left steering cylinder and the right steering cylinder return oil slowly, pass through B1 to reach the port T', and then reach the oil return oil tank 6. The rodless cavity of the right steering cylinder 5 is directly connected with the oil tank through B 'and T', the pressure is zero, but the existence of the throttling groove between B1 and T can lead the pressure of the rod cavity of the right steering cylinder 5 to be slightly larger than the pressure of the rodless cavity, and the piston rod of the right steering cylinder 5 can be slightly retracted. At this time, the extension distance of the piston rod of the left steering cylinder 4 is larger than the retraction distance of the piston rod of the right steering cylinder, and the two work together to cause the harvester to steer leftwards.
When the steering control valve is at the left position, A ', P1 and P' are communicated, oil reaches the rodless cavity of the left steering cylinder, and the piston rod of the left steering cylinder 4 extends out. Since the B1 connected to the rod chambers of the left steering cylinder 4 and the right steering cylinder 4 is a closed port, the pressure is increased continuously, and the piston rod of the right steering cylinder 5 is driven to retract. At this time, the extension distance of the piston rod of the left steering cylinder 4 is equal to the retraction distance of the piston rod of the right steering cylinder 5, and the two work together to cause the harvester to steer leftwards in situ.
When the steering control valve is in the right position, B ', P1 and P' are communicated, oil reaches the rodless cavity of the right steering cylinder 5, and the piston rod of the right steering cylinder 5 extends. The rod cavities of the left steering cylinder 4 and the right steering cylinder 5 slowly return oil, and the oil passes through the port B1 to reach the port T' and then reaches the oil return oil tank 6. The rodless cavity of the left steering cylinder 4 is directly connected with the return oil tank 6 through B ' and T ', the pressure is zero, but the existence of the throttling groove between B1 and T ' can lead the pressure of the rod cavity of the left steering cylinder 4 to be slightly larger than the pressure of the rodless cavity, and the piston rod of the left steering cylinder 4 can be slightly retracted. At this time, the extension distance of the piston rod of the right steering cylinder 5 is larger than the retraction distance of the piston rod of the left steering cylinder 4, and the two work together to cause the harvester to steer rightwards.
When the steering control valve is at the right position, B ', P1 and P' are communicated, oil reaches the rodless cavity of the right steering cylinder 5, and the piston rod of the right steering cylinder 5 extends out. Since the B1 connected by the rod chambers of the left steering cylinder 4 and the right steering cylinder 5 is a closed port, the pressure is increased continuously, and the piston rod of the left steering cylinder 4 is driven to retract. At this time, the extension distance of the piston rod of the right steering cylinder 5 is equal to the retraction distance of the piston rod of the left steering cylinder 4, and the two work together to cause the harvester to steer rightwards in situ.
It should be understood that the above-described specific embodiments are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications which extend from the spirit of the present invention are within the scope of the present invention.
Claims (5)
1. A synchronous valve for controlling harvester steering and header lifting, characterized in that: the harvester comprises an oil source (1), a multifunctional slide valve (2), a header oil cylinder (3) for controlling the lifting of a header, a left steering oil cylinder (4) for controlling the left steering of the harvester, a right steering oil cylinder (5) for controlling the right steering of the harvester and an oil return oil tank (6), wherein the multifunctional slide valve (2) comprises a header control valve (23), a steering control valve (24) and a hydraulic control one-way valve (25) connected in series with the header oil cylinder (3) for controlling the lifting of the header;
The cutting table control valve (23) is a three-position five-way reversing valve, the cutting table control valve (23) comprises an A port, a B port, a P port, a T port and a T1 port, the A port is connected with an oil inlet of the hydraulic control one-way valve (25), the B port is connected with a control port of the hydraulic control one-way valve (25), the P port is connected with the oil source 1, the T port is connected with the oil return oil tank (6), when the cutting table control valve (23) is positioned in the middle position, the A port, the B port and the T port are all closed ports, the P port is communicated with the T1 port, when the cutting table control valve (23) is positioned in the left position, the A port is communicated with the P port, the B port is communicated with the T1 port, and the T1 port is a closed port;
The steering control valve (24) is a five-position six-way reversing valve, the steering control valve (24) comprises an A 'port, a B' port and a B1 port, the P 'port and the T' port, the A 'port is connected with a rodless cavity of the left steering cylinder (4), the B' port is connected with a rodless cavity of the right steering cylinder (5), the B1 port is simultaneously connected with rod cavities of the left steering cylinder (4) and the right steering cylinder (5), the rod cavities of the left steering cylinder (4) and the right steering cylinder (5) are communicated, the P1 port is connected with an oil source, the P 'port is connected with a T'1 port of the header control valve (23), the T 'port is connected with an oil return tank (6), and the steering control valve (24) is positioned in the middle position, the A' port, the B1 port, the P 'port and the T' port are communicated, the P1 port is a closed port, when the steering control valve (24) is positioned at the left position, the A 'port, the P1 port and the P' port are communicated, the B 'port, the B1 port and the T' port are communicated, when the steering control valve (24) is positioned at the left position, the A 'port, the P1 port and the P' port are communicated, the B 'port is communicated with the T' port, the B1 port is a closed port, the B 'port, the P1 port and the P' port are communicated when the steering control valve (24) is positioned at the right one position, the A 'port, the B1 port and the T' port are communicated, the B 'port, the P1 port and the P' port are communicated when the steering control valve (24) is positioned at the right two position, the A 'port and the T' port are communicated, and the B1 port is a closed port.
2. A synchronizing valve for controlling the turning of a harvester and the lifting of a header as defined in claim 1, wherein: when the steering control valve (24) is positioned at the left position, a throttling groove is arranged between the port B1 and the port T'; when the steering control valve (24) is positioned at the right position, a throttling groove is arranged between the B1 and the T'.
3. The synchro-valve for controlling the turning of the harvester and the lifting of the header of claim 1, wherein: the multifunctional slide valve (2) further comprises a safety valve and an overflow valve, wherein the safety valve is positioned near an oil source, an oil inlet of the safety valve is connected with the oil source, an oil outlet of the safety valve is connected with an oil return tank (6), an oil inlet of the overflow valve is connected with an oil path between a P port and a T1 port, and an oil outlet of the overflow valve is connected with the oil tank (6).
4. A synchro-valve for controlling the turning of a harvester and the lifting of a header according to claim 3, characterized in that: the opening pressure of the relief valve is 13.5MPa, and the opening pressure of the overflow valve is 7-8 MPa.
5. A synchro-valve for controlling the turning of a harvester and the lifting of a header according to claim 3, characterized in that: the multifunctional slide valve (2) is a composite manual valve integrating a safety valve, an overflow valve, a header control valve (23), a steering control valve (24) and a hydraulic control one-way valve (25).
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CN201710387468.4A CN108930679B (en) | 2017-05-27 | 2017-05-27 | Synchronous valve for controlling harvester steering and header lifting |
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CN201710387468.4A CN108930679B (en) | 2017-05-27 | 2017-05-27 | Synchronous valve for controlling harvester steering and header lifting |
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CN108930679B true CN108930679B (en) | 2024-08-13 |
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Families Citing this family (3)
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CN114321047B (en) * | 2020-09-26 | 2024-08-13 | 江苏沃得高新农业装备有限公司 | Harvester header goes up and down and driving turns to parallel control energy-saving valve group |
CN113983014B (en) * | 2021-10-12 | 2024-06-04 | 中国煤炭科工集团太原研究院有限公司 | Double-cutting-arm heading machine and cutting arm control method |
CN115042857A (en) * | 2022-07-14 | 2022-09-13 | 芜湖双翼液压件有限公司 | Crawler-type steering hydraulic valve and control system |
Citations (1)
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CN207598603U (en) * | 2017-05-27 | 2018-07-10 | 江苏沃得农业机械有限公司 | It is a kind of to be used to that harvester to be controlled to turn to the synchronous valve with taiwan cut off and landing |
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JPH09100806A (en) * | 1995-10-05 | 1997-04-15 | Kubota Corp | Hydraulic power unit for travel |
JP3695129B2 (en) * | 1998-04-14 | 2005-09-14 | 井関農機株式会社 | Hydraulic drive circuit such as combine |
JP2004210021A (en) * | 2002-12-27 | 2004-07-29 | Komatsu Ltd | Steering circuit equipped with auxiliary hydraulic port using steering valve |
CN201218248Y (en) * | 2008-06-18 | 2009-04-08 | 湖州生力液压有限公司 | Multifunctional integration composite valve |
CN102511238B (en) * | 2011-12-23 | 2013-11-13 | 浙江大学 | Small-sized full-hydraulic self-propelled windrower |
CN203670329U (en) * | 2013-12-25 | 2014-06-25 | 新魁液压技术有限公司 | Novel hydraulic control system of combine harvester |
CN103727267B (en) * | 2014-01-24 | 2016-02-10 | 浙江海宏液压科技股份有限公司 | Reaper multi-way valve |
CN204253479U (en) * | 2014-11-13 | 2015-04-08 | 湖州生力液压有限公司 | The omnidistance electric-controlled type hydrovalve of reaper |
CN204610402U (en) * | 2015-05-19 | 2015-09-02 | 福田雷沃国际重工股份有限公司 | A kind of combine hydraulic control system |
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CN207598603U (en) * | 2017-05-27 | 2018-07-10 | 江苏沃得农业机械有限公司 | It is a kind of to be used to that harvester to be controlled to turn to the synchronous valve with taiwan cut off and landing |
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