CN111022399A - Hydraulic system of bituminous road pavement rolling machine - Google Patents
Hydraulic system of bituminous road pavement rolling machine Download PDFInfo
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- CN111022399A CN111022399A CN202010035264.6A CN202010035264A CN111022399A CN 111022399 A CN111022399 A CN 111022399A CN 202010035264 A CN202010035264 A CN 202010035264A CN 111022399 A CN111022399 A CN 111022399A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 19
- 239000010426 asphalt Substances 0.000 claims abstract description 10
- 239000003921 oil Substances 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 239000010720 hydraulic oil Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- 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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- 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
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- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/008—Reduction of noise or vibration
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- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic system of an asphalt road pavement rolling device, which comprises a large-flow hydraulic pump A, a small-flow hydraulic pump B, a first electro-hydraulic directional valve, a second electro-hydraulic directional valve, a first electromagnetic directional valve and a second electromagnetic directional valve, wherein the output of the large-flow hydraulic pump A is connected with the first electro-hydraulic directional valve and the first one-way valve, a node between the first one-way valve and the second electro-hydraulic directional valve is connected with a second one-way sequence valve, the second one-way sequence valve is connected with a third electro-hydraulic directional valve, a fourth electro-hydraulic directional valve and a fifth electro-hydraulic directional valve, the right directional end of the third electro-hydraulic directional valve is connected with a stroke valve for limiting the stroke of the third electro-hydraulic directional valve, and control ends on two sides of the first electro-hydraulic directional valve are connected with a node a between the small-flow hydraulic pump B and the one-way valve. The hydraulic system provided by the invention adopts the double pumps to work, and simultaneously adopts the sequence valve to supply oil to the two paths in sequence, so that the service efficiency of the pumps is improved.
Description
Technical Field
The invention relates to a hydraulic system of a bituminous road pavement rolling machine, belonging to the technical field of bridge devices.
Background
The road roller belongs to the field of road equipment in engineering machinery, is widely used for the filling compaction operation of large engineering projects such as high-grade highways, railways, airport runways, dams, stadiums and the like, and can roll sandy, semi-viscous and viscous soil, roadbed stabilized soil and asphalt concrete pavement layers. The roller is suitable for various compaction operations under the action of the gravity of the machine, so that the compacted layer is permanently deformed and compacted. The road rollers are divided into a steel wheel type and a tire type.
At present, the domestic vibratory roller mainly adopts a medium-small tonnage and a mechanical transmission mode, and the full-hydraulic heavy vibratory roller with excellent performance mainly depends on import. The hydraulic system of the asphalt road surface rolling device in the current market is not energy-saving enough, the effect of the road roller used in complex working conditions is not good, and the development of the hydraulic road roller transmission system with a good structure is very important.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a hydraulic system of a bituminous road rolling device, which solves the technical problems that the hydraulic system of the bridge bituminous road rolling device in the current market is not energy-saving enough and the effect of road rolling is poor under complex working conditions.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a hydraulic system of an asphalt road pavement rolling device comprises a large-flow hydraulic pump A, a small-flow hydraulic pump B, a first electro-hydraulic directional valve, a second electro-hydraulic directional valve, a first electromagnetic directional valve and a second electromagnetic directional valve, wherein the output of the large-flow hydraulic pump A is connected with the first electro-hydraulic directional valve and the first one-way valve, the first electro-hydraulic directional valve is connected with the first one-way valve in parallel, a working port of the first electro-hydraulic directional valve is connected with a hydraulic motor, the first one-way valve is connected with the second electro-hydraulic directional valve in series, a working port of the second electro-hydraulic directional valve is connected with a first hydraulic cylinder, a first one-way sequence valve is connected between a rodless cavity of the first hydraulic cylinder and a working port of the second electro-hydraulic directional valve, a node between the first one-way valve and the second electro-hydraulic directional valve is connected with the second one-way sequence valve, and the second one-way sequence valve is connected with a third electro-hydraulic directional valve and a, The hydraulic control system comprises a fourth electro-hydraulic directional valve and a fifth electro-hydraulic directional valve, wherein the third electro-hydraulic directional valve, the fourth electro-hydraulic directional valve and the fifth electro-hydraulic directional valve are connected in parallel, a working port of the third electro-hydraulic directional valve is connected with a second hydraulic cylinder, a hydraulic control one-way valve is connected between one working port of the third electro-hydraulic directional valve and a rodless cavity of the second hydraulic cylinder, a rod cavity of the second hydraulic cylinder is connected with the hydraulic control one-way valve, the rod cavity and the rodless cavity of the second hydraulic cylinder are simultaneously connected with the hydraulic control one-way valve for improving the rightward running speed of the second hydraulic cylinder, a small-flow hydraulic pump B is arranged at a node between the second one-way sequence valve and the third electro-hydraulic directional valve, the fourth electro-hydraulic directional valve and the fifth electro-hydraulic directional valve, an input working port of the third electro-hydraulic directional valve is connected with the second electro-hydraulic directional valve in series, and an input working port of the second electro-hydraulic directional valve is connected with two ends of the third, the hydraulic control system is characterized in that the right reversing end of the third electro-hydraulic reversing valve is connected with a stroke valve used for limiting the stroke of the third electro-hydraulic reversing valve, one working port of the fifth electro-hydraulic reversing valve is connected with a third hydraulic cylinder, a rod cavity of the third hydraulic cylinder and a rodless cavity of the second hydraulic cylinder are driven by hydraulic oil from a hydraulic control check valve, an outlet of the small-flow hydraulic pump B is further connected with a check valve, the check valve is connected with a first electromagnetic reversing valve, the working port of the first electromagnetic reversing valve is connected with the third hydraulic cylinder, and control ends on two sides of the first electro-hydraulic reversing valve are connected with the small-flow hydraulic pump B and a node a between the check valves.
Preferably, a third overflow valve and a pressure gauge for controlling the small-flow hydraulic pump B to output the highest pressure are arranged at the outlet of the small-flow hydraulic pump B.
Preferably, the fifth electro-hydraulic directional valve is a two-position four-way directional valve, and the input end of the fifth electro-hydraulic directional valve is connected with a second one-way valve.
Preferably, a first overflow valve for protecting the branch and a first speed regulating valve for regulating the flow entering the first hydraulic motor are connected between the first electro-hydraulic reversing valve and the hydraulic motor, and the first electro-hydraulic reversing valve is a three-position four-way electro-hydraulic reversing valve.
Preferably, a second overflow valve for protecting a branch and a first speed regulating valve for regulating the flow entering the rodless cavity of the first hydraulic cylinder are connected between the rodless cavity of the first hydraulic cylinder and a working port of the second electro-hydraulic directional valve, and the second electro-hydraulic directional valve is a three-position four-way electro-hydraulic directional valve.
(III) advantageous effects
The invention provides a hydraulic system of a bituminous road pavement rolling device. The method has the following beneficial effects:
1. the hydraulic system of the invention adopts double pumps to work, and simultaneously adopts the sequence valve to supply oil to two paths in sequence, thereby having the characteristic of energy conservation and improving the service efficiency of the pumps. A common oil tank is selected for use through the large-flow hydraulic pump A and the small-flow hydraulic pump B, and filter screens are arranged at the input ends of the large-flow hydraulic pump A and the small-flow hydraulic pump B, so that the cleanliness of the system can be improved.
2. The hydraulic system comprises a third hydraulic cylinder and a second hydraulic cylinder, wherein the third hydraulic cylinder and the second hydraulic cylinder are used for pressurizing a pressure wheel, a rod cavity of the third hydraulic cylinder and a rodless cavity of the second hydraulic cylinder are driven by hydraulic oil from a hydraulic control one-way valve, and the two cylinders are driven by an oil way, so that the hydraulic system has the function of saving energy. Meanwhile, the hydraulic pump B with small flow preferentially supplies oil to the fourth electro-hydraulic directional valve, the third hydraulic cylinder and the second hydraulic cylinder, and supplies oil to the first hydraulic cylinder and the third hydraulic cylinder when the oil pressure is overlarge, so that a hydraulic system is optimized; the right side of the hydraulic control valve is provided with a stroke valve for limiting the strokes of the third hydraulic cylinder and the second hydraulic cylinder, so that the phenomenon that shaking caused by impact is overlarge is prevented, the second electromagnetic directional valve controls the reversing of the third electro-hydraulic directional valve, and the linkage control of the third electro-hydraulic directional valve is realized.
Drawings
FIG. 1 is a schematic diagram of a hydraulic system of an asphalt road rolling machine according to the present invention.
In the figure: the hydraulic control system comprises a large-flow hydraulic pump A, a small-flow hydraulic pump B, a first electro-hydraulic directional valve 1, a second electro-hydraulic directional valve 2, a first electromagnetic directional valve 3, a second electromagnetic directional valve 4, a third electro-hydraulic directional valve 5, a fifth electro-hydraulic directional valve 6, a third overflow valve 7, a second overflow valve 8, a first overflow valve 9, a second one-way valve 10, a first one-way valve 11, a one-way valve 12, a hydraulic control one-way valve 13, a first speed regulating valve 15, a throttle valve 14, a first speed regulating valve 16, a second one-way sequence valve 17, a first one-way sequence valve 18, a stroke valve 19, a hydraulic motor 20, a fourth electro-hydraulic directional valve 21, a first hydraulic cylinder 22, a pressure gauge 23, a third hydraulic cylinder 24, a second hydraulic cylinder 25 and a third hydraulic cylinder 26.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a hydraulic system of an asphalt road pavement rolling device as shown in figure 1, which comprises a large-flow hydraulic pump A, a small-flow hydraulic pump B, a first electro-hydraulic directional valve 1, a second electro-hydraulic directional valve 2, a first electromagnetic directional valve 3 and a second electromagnetic directional valve 4, wherein the output of the large-flow hydraulic pump A is connected with the first electro-hydraulic directional valve 1 and a first one-way valve 11, the first electro-hydraulic directional valve 1 is connected with the first one-way valve 11 in parallel, the working port of the first electro-hydraulic directional valve 1 is connected with a hydraulic motor 20, the first one-way valve 11 is connected with the second electro-hydraulic directional valve 2 in series, the working port of the second electro-hydraulic directional valve 2 is connected with a first hydraulic cylinder 22, a first one-way sequence valve 18 is connected between the rodless cavity of the first hydraulic cylinder 22 and the working port of the second electro-hydraulic directional valve 2, the node between the first one-way valve 11 and the second electro-hydraulic directional valve 2 is connected with a second one-way sequence valve 17, the second one-way sequence valve 17 is connected with a third electro-hydraulic directional valve 5, a fourth electro-hydraulic directional valve 21 and a fifth electro-hydraulic directional valve 6, the third electro-hydraulic directional valve 5, the fourth electro-hydraulic directional valve 21 and the fifth electro-hydraulic directional valve 6 are connected in parallel, a working port of the third electro-hydraulic directional valve 5 is connected with a second hydraulic cylinder 25, a hydraulic control one-way valve 13 is connected between one working port of the third electro-hydraulic directional valve 5 and a rodless cavity of the second hydraulic cylinder 25, a rod cavity of the second hydraulic cylinder 25 is connected with the hydraulic control one-way valve 13, the rod cavity and the rodless cavity of the second hydraulic cylinder 25 are simultaneously connected with the hydraulic control one-way valve 13 for improving the running speed of the second hydraulic cylinder 25 to the right, and small-flow hydraulic pumps B are arranged at nodes between the second one-way sequence valve 17 and the third electro-hydraulic directional valve 5, the fourth electro-hydraulic directional valve 21 and the fifth electro-hydraulic directional valve 6, the hydraulic control system is characterized in that an input working port of a third electro-hydraulic directional valve 5 is connected with a second electro-hydraulic directional valve 4 in series, the input working port of the second electro-hydraulic directional valve 4 is connected with two ends of the third electro-hydraulic directional valve 5 in hydraulic control direction, the right direction-changing end of the third electro-hydraulic directional valve 5 is connected with a stroke valve 19 for limiting the stroke of the third electro-hydraulic directional valve 5, one working port of a fifth electro-hydraulic directional valve 6 is connected with a third hydraulic cylinder 24, a rod cavity of the third hydraulic cylinder 24 and a rodless cavity of a second hydraulic cylinder 25 are driven by hydraulic oil from a hydraulic control one-way valve 13, an outlet of a small-flow hydraulic pump B is also connected with a one-way valve 12, the one-way valve 12 is connected with a first electro-hydraulic directional valve 3, the working port of the first electro-hydraulic directional valve 3 is connected with a third hydraulic cylinder 26, and control ends of two sides of the first electro-hydraulic directional, Node a between the check valves 12.
Further, a third overflow valve 7 and a pressure gauge 23 for controlling the small flow hydraulic pump B to output the highest pressure are arranged at the outlet of the small flow hydraulic pump B.
Furthermore, the fifth electro-hydraulic directional valve 6 is a two-position four-way directional valve, and the input end of the fifth electro-hydraulic directional valve 6 is connected with a second one-way valve 10.
Further, a first overflow valve 9 for protecting a branch and a first speed regulating valve 16 for regulating the flow entering the hydraulic motor 20 are connected between the first electro-hydraulic directional valve 1 and the hydraulic motor 20, and the first electro-hydraulic directional valve 1 is a three-position four-way electro-hydraulic directional valve.
Further, a second overflow valve 8 for protecting a branch and a first speed regulating valve 15 for regulating the flow entering the rodless cavity of the first hydraulic cylinder 22 are connected between the rodless cavity of the first hydraulic cylinder 22 and the working port of the second electro-hydraulic directional valve 2, and the second electro-hydraulic directional valve 2 is a three-position four-way electro-hydraulic directional valve.
When the hydraulic pump is used, the large-flow hydraulic pump A and the small-flow hydraulic pump B select a common oil tank, and filter screens are arranged at the input ends of the large-flow hydraulic pump A and the small-flow hydraulic pump B; during working, oil from the high-flow hydraulic pump A is controlled by the first electro-hydraulic directional valve 1 to enter the hydraulic motor 20, the hydraulic motor 20 can be connected with a pinch roller driving mechanism of the road roller for rolling, and the rotation speed of the hydraulic motor 20 is adjusted by the throttling size of the first speed adjusting valve 16; meanwhile, the incoming oil of the high-flow hydraulic pump A enters the first hydraulic cylinder 22 through the second electro-hydraulic directional valve 2, and the first hydraulic cylinder 22 is connected with a cooling system on the pressing wheel, so that the movement of the cooling system is realized; the incoming oil of the small-flow hydraulic pump B is divided into three paths, the first path is supplied to a third hydraulic cylinder 26, the third hydraulic cylinder 26 is connected with an illuminating lamp structure needing to be moved, and when the pressure of a node a is overlarge, a second one-way sequence valve 17 is opened to supply the hydraulic oil to a first hydraulic cylinder 22; the second path is supplied to a fourth electro-hydraulic directional valve 21, and the fourth electro-hydraulic directional valve 21 is connected with a pinch roller lifting oil cylinder and can control the lifting of the pinch roller; the third way supplies a third hydraulic cylinder 24 and a second hydraulic cylinder 25 which are used for pressurizing the pinch roller, a rod cavity of the third hydraulic cylinder 24 and a rodless cavity of the second hydraulic cylinder 25 are driven by hydraulic oil from the hydraulic control one-way valve 13, and the two cylinders are driven by one oil way, so that the energy-saving effect is achieved. Meanwhile, the hydraulic pump B with small flow preferentially supplies oil to the fourth electro-hydraulic directional valve 21, the third hydraulic cylinder 24 and the second hydraulic cylinder 25, and supplies oil to the first hydraulic cylinder 22 and the third hydraulic cylinder 26 when the oil pressure is overlarge, so that a hydraulic system is optimized; the stroke valve 19 is arranged on the right side of the third electro-hydraulic directional valve 5 and used for limiting the strokes of the third hydraulic cylinder 24 and the second hydraulic cylinder 25, so that the phenomenon that shaking caused by impact is too large is prevented, the second electromagnetic directional valve 4 controls the direction change of the third electro-hydraulic directional valve 5, and the linkage control of the third electro-hydraulic directional valve 5 is realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A hydraulic system of an asphalt road pavement rolling device comprises a large-flow hydraulic pump (A), a small-flow hydraulic pump (B), a first electro-hydraulic directional valve (1), a second electro-hydraulic directional valve (2), a first electromagnetic directional valve (3) and a second electromagnetic directional valve (4), and is characterized in that the output of the large-flow hydraulic pump (A) is connected with the first electro-hydraulic directional valve (1) and a first one-way valve (11), the first electro-hydraulic directional valve (1) is connected with the first one-way valve (11) in parallel, a working port of the first electro-hydraulic directional valve (1) is connected with a hydraulic motor (20), the first one-way valve (11) is connected with the second electro-hydraulic directional valve (2) in series, a working port of the second electro-hydraulic directional valve (2) is connected with a first hydraulic cylinder (22), a rodless cavity of the first hydraulic cylinder (22) is connected with a working port of the second electro-hydraulic directional valve (2) through a first one-way sequence valve (18), the node between the first check valve (11) and the second electro-hydraulic directional valve (2) is connected with a second check sequence valve (17), the second check sequence valve (17) is connected with a third electro-hydraulic directional valve (5), a fourth electro-hydraulic directional valve (21) and a fifth electro-hydraulic directional valve (6), the third electro-hydraulic directional valve (5), the fourth electro-hydraulic directional valve (21) and the fifth electro-hydraulic directional valve (6) are connected in parallel, a working port of the third electro-hydraulic directional valve (5) is connected with a second hydraulic cylinder (25), a working port of the third electro-hydraulic directional valve (5) and a rodless cavity of the second hydraulic cylinder (25) are connected with a hydraulic control check valve (13), a rod cavity and a rodless cavity of the second hydraulic cylinder (25) are connected with the hydraulic control check valve (13) simultaneously, and the rod cavity and the rodless cavity of the second hydraulic cylinder (25) are used for improving the rightward running speed of the second hydraulic cylinder (25), a small-flow hydraulic pump (B) is arranged at a node between the second one-way sequence valve (17) and the third electro-hydraulic directional valve (5), the fourth electro-hydraulic directional valve (21) and the fifth electro-hydraulic directional valve (6), an input working port of the third electro-hydraulic directional valve (5) is connected with the second electromagnetic directional valve (4) in series, an input working port of the second electromagnetic directional valve (4) is connected with two ends of the third electro-hydraulic directional valve (5) for hydraulic control reversing, the right reversing end of the third electro-hydraulic directional valve (5) is connected with a stroke valve (19) for limiting the stroke of the third electro-hydraulic directional valve (5), one working port of the fifth electro-hydraulic directional valve (6) is connected with the third hydraulic cylinder (24), a rod cavity of the third hydraulic cylinder (24) and a rodless cavity of the second hydraulic cylinder (25) are driven by hydraulic oil from the hydraulic directional valve (13), the outlet of the small-flow hydraulic pump (B) is further connected with a check valve (12), the check valve (12) is connected with a first electromagnetic directional valve (3), the working port of the first electromagnetic directional valve (3) is connected with a third hydraulic cylinder (26), and the control ends of two sides of the first electro-hydraulic directional valve (1) are connected with a node a between the small-flow hydraulic pump (B) and the check valve (12).
2. The hydraulic system of the asphalt road pavement rolling machine according to claim 1, characterized in that the outlet of the small flow hydraulic pump (B) is provided with a third overflow valve (7) and a pressure gauge (23) for controlling the maximum pressure output by the small flow hydraulic pump (B).
3. The hydraulic system of the asphalt road pavement rolling machine according to claim 1, characterized in that the fifth electro-hydraulic directional valve (6) is a two-position four-way directional valve, and the input end of the fifth electro-hydraulic directional valve (6) is connected with a second one-way valve (10).
4. The hydraulic system of the asphalt road pavement rolling machine according to claim 1, characterized in that a first overflow valve (9) for protecting a branch and a first speed regulating valve (16) for regulating the flow entering the hydraulic motor (20) are connected between the first electro-hydraulic directional valve (1) and the hydraulic motor (20), and the first electro-hydraulic directional valve (1) is a three-position four-way electro-hydraulic directional valve.
5. The hydraulic system of the bituminous road pavement rolling machine according to claim 1, characterized in that a second overflow valve (8) for protecting a branch and a first speed regulating valve (15) for regulating the flow entering the rodless cavity of the first hydraulic cylinder (22) are connected between the rodless cavity of the first hydraulic cylinder (22) and the working port of the second electro-hydraulic directional valve (2), and the second electro-hydraulic directional valve (2) is a three-position four-way electro-hydraulic directional valve.
6. The hydraulic system of the asphalt road pavement rolling machine according to claim 1, characterized in that an adjustable throttle valve (14) for controlling a third hydraulic cylinder (26) is connected to the oil return port of the first electromagnetic directional valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035264.6A CN111022399B (en) | 2020-01-14 | 2020-01-14 | Hydraulic system of bituminous road pavement rolling machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035264.6A CN111022399B (en) | 2020-01-14 | 2020-01-14 | Hydraulic system of bituminous road pavement rolling machine |
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| CN111022399A true CN111022399A (en) | 2020-04-17 |
| CN111022399B CN111022399B (en) | 2021-08-10 |
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| CN111022399B (en) | 2021-08-10 |
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