CN114934552B - Energy-saving hydraulic system for working device of front shovel excavator - Google Patents
Energy-saving hydraulic system for working device of front shovel excavator Download PDFInfo
- Publication number
- CN114934552B CN114934552B CN202210635669.2A CN202210635669A CN114934552B CN 114934552 B CN114934552 B CN 114934552B CN 202210635669 A CN202210635669 A CN 202210635669A CN 114934552 B CN114934552 B CN 114934552B
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- oil
- oil cylinder
- movable arm
- control valve
- position reversing
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- 239000003921 oil Substances 0.000 claims description 193
- 239000010720 hydraulic oil Substances 0.000 claims description 23
- 238000005381 potential energy Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002131 composite material Substances 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
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- 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
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/422—Drive systems for bucket-arms, front-end loaders, dumpers or the like
-
- 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
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
-
- 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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention belongs to the technical field of front shovel excavators, and in particular relates to an energy-saving hydraulic system for a working device of a front shovel excavator, which comprises a control valve group, a movable arm oil cylinder and a bucket rod oil cylinder, wherein the control valve group comprises a three-position reversing valve I and a three-position reversing valve II; two working oil ports of the three-position reversing valve I are respectively connected with a large cavity of the bucket rod oil cylinder and a small cavity of the bucket rod oil cylinder; two working oil ports of the three-position reversing valve II are respectively connected with a large cavity of the movable arm oil cylinder and a small cavity of the movable arm oil cylinder; the hydraulic lifting device further comprises a leveling oil cylinder arranged between the movable arm and the bucket rod, wherein a large cavity of the leveling oil cylinder is connected with a large cavity of the movable arm oil cylinder, and a small cavity of the leveling oil cylinder is connected with a small cavity of the movable arm oil cylinder. And establishing action connection of the movable arm oil cylinder and the bucket rod oil cylinder through the leveling oil cylinder. When the movable arm descends, partial gravitational potential energy of the movable arm is converted into power for swinging the bucket rod outwards; when the bucket rod is in the bucket rod, the gravitational potential energy received in the bucket rod is converted into the kinetic energy for lifting the movable arm. The power output of the engine is reduced, and the energy-saving effect is further achieved.
Description
Technical Field
The invention belongs to the technical field of front shovel excavators, and particularly relates to an energy-saving hydraulic system for a working device of a front shovel excavator.
Background
With the rapid development of green economy, industry and market put higher demands on energy consumption and emission of large-scale mechanical equipment, and energy conservation and emission reduction technology has become an important direction of research and development in the field of engineering machinery.
Through the research on the working characteristics of the front shovel hydraulic excavator, the front shovel hydraulic excavator commonly uses the composite action of the movable arm lifting and the bucket rod adduction and the composite action of the movable arm descending and the bucket rod outward swinging in the working cycle of one excavating loading, and the action of the conventional front shovel hydraulic excavator on the movable arm oil cylinder and the action of the bucket rod oil cylinder are driven by hydraulic pressure, so that the connection between the action of the movable arm oil cylinder and the action of the bucket rod oil cylinder is not considered.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an energy-saving hydraulic system for a working device of a face shovel excavator, which is used for reducing the power output of an engine by utilizing the conversion and utilization of self gravitational potential energy when a movable arm descends and a bucket rod adduction acts through establishing the action connection of the movable arm oil cylinder and the bucket rod oil cylinder, thereby achieving the energy-saving effect.
The invention is realized by the following technical scheme: an energy-saving hydraulic system for a working device of a front shovel excavator comprises a control valve group, a movable arm oil cylinder and a bucket rod oil cylinder, wherein the control valve group comprises a three-position reversing valve I and a three-position reversing valve II; two working oil ports of the three-position reversing valve I are respectively connected with a large cavity of the bucket rod oil cylinder and a small cavity of the bucket rod oil cylinder; two working oil ports of the three-position reversing valve II are respectively connected with a large cavity of the movable arm oil cylinder and a small cavity of the movable arm oil cylinder; the oil inlet of the three-position reversing valve I and the oil inlet of the three-position reversing valve II are connected with a pump, and the oil return port of the three-position reversing valve I and the oil return port of the three-position reversing valve II are connected with a hydraulic oil tank; the hydraulic lifting device further comprises a leveling oil cylinder arranged between the movable arm and the bucket rod, wherein a large cavity of the leveling oil cylinder is connected with a large cavity of the movable arm oil cylinder, and a small cavity of the leveling oil cylinder is connected with a small cavity of the movable arm oil cylinder.
Further, the control valve group is an integrated valve, a first working oil port of the three-position reversing valve I is connected with an oil port B1 of the control valve group, and a second working oil port of the three-position reversing valve I is connected with an oil port A1 of the control valve group; the first working oil port of the three-position reversing valve II is connected with the oil port B2 of the control valve group, and the second working oil port of the three-position reversing valve II is connected with the oil port A2 of the control valve group; the oil inlet of the three-position reversing valve I and the oil inlet of the three-position reversing valve II are connected with the oil inlet P of the control valve bank, and the oil return port of the three-position reversing valve I and the oil return port of the three-position reversing valve II are connected with the oil return port T of the control valve bank.
Further, a main overflow valve is arranged between an oil inlet P of the control valve group and an oil return port T of the control valve group.
Furthermore, overload overflow valves are arranged between the oil port B1 of the control valve group and the oil return port T of the control valve group, between the oil port A1 of the control valve group and the oil return port T of the control valve group, between the oil port B2 of the control valve group and the oil return port T of the control valve group and between the oil port A2 of the control valve group and the oil return port T of the control valve group.
Further, a one-way throttle valve is arranged between the control valve group and the large cavity of the movable arm oil cylinder, and an oil outlet of the one-way valve of the one-way throttle valve is connected with the large cavity of the movable arm oil cylinder.
Furthermore, the oil inlet of the three-position reversing valve I and the oil inlet of the three-position reversing valve II are both provided with one-way valves.
The beneficial effects of the invention are as follows: and establishing action connection of the movable arm oil cylinder and the bucket rod oil cylinder through the leveling oil cylinder. When the movable arm descends, partial gravitational potential energy of the movable arm is converted into power for swinging the bucket rod outwards; when the bucket rod is internally received, gravitational potential energy received by the bucket rod is converted into kinetic energy for lifting the movable arm, so that the power output of the engine is reduced, and the energy-saving effect is further achieved.
Drawings
FIG. 1 is a hydraulic schematic of the present invention;
FIG. 2 is a schematic diagram of the construction of the work implement of the face shovel excavator of the present invention;
in the figure, 1, a pump, 2, a hydraulic oil tank, 3, a control valve group, 3-1, a three-position reversing valve I, 3-2, a three-position reversing valve II, 3-3, a main overflow valve, 3-4, an overload overflow valve, 4, a one-way throttle valve, 5, a movable arm oil cylinder, 6, a leveling oil cylinder, 7, a bucket, 8, an arm oil cylinder, 9, a movable arm, 10 and an arm.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 2, the work device of the front shovel includes a bucket 7, an arm 10, and a boom 9, and the bucket 7 is hingedly connected to the arm 10 and to both the arm 10 and the boom 9. A movable arm oil cylinder 5 is arranged between the movable arm 9 and the base, and two movable arm oil cylinders 5 are symmetrically arranged on two sides of the movable arm 9. An arm cylinder 8 and a leveling cylinder 6 are arranged between the arm 10 and the movable arm 9, and the leveling cylinder 6 is arranged right above the arm cylinder 8.
As shown in fig. 1 and 2, an energy-saving hydraulic system for a working device of a face shovel excavator includes a control valve group 3, a boom cylinder 5, a leveling cylinder 6, and an arm cylinder 8. The control valve group 3 comprises a three-position reversing valve I3-1 and a three-position reversing valve II 3-2. Two working oil ports of the three-position reversing valve I3-1 are respectively connected with a large cavity of the bucket rod oil cylinder 8 and a small cavity of the bucket rod oil cylinder 8; two working oil ports of the three-position reversing valve II 3-2 are respectively connected with a large cavity of the movable arm oil cylinder 5 and a small cavity of the movable arm oil cylinder 5. The oil inlet of the three-position reversing valve I3-1 and the oil inlet of the three-position reversing valve II 3-2 are connected with the oil outlet of the pump 1, and the oil return port of the three-position reversing valve I3-1 and the oil return port of the three-position reversing valve II 3-2 are connected with the hydraulic oil tank 2.
When the three-position reversing valve I3-1 is at the left station, the pump 1 is connected with the small cavity of the bucket rod oil cylinder 8 through the three-position reversing valve I3-1, and the large cavity of the bucket rod oil cylinder 8 is connected with the hydraulic oil tank 2 through the three-position reversing valve I3-1. When the three-position reversing valve I3-1 is positioned at the right station, the pump 1 is connected with the large cavity of the bucket rod oil cylinder 8 through the three-position reversing valve I3-1, and the small cavity of the bucket rod oil cylinder 8 is connected with the hydraulic oil tank 2 through the three-position reversing valve I3-1. When the three-position reversing valve II 3-2 is at the left station, the pump 1 is connected with the large cavity of the movable arm oil cylinder 5 through the three-position reversing valve II 3-2, and the small cavity of the movable arm oil cylinder 5 is connected with the hydraulic oil tank 2 through the three-position reversing valve II 3-2. When the three-position reversing valve II 3-2 is at the right station, the pump 1 is connected with the small cavity of the movable arm oil cylinder 5 through the three-position reversing valve II 3-2, and the large cavity of the movable arm oil cylinder 5 is connected with the hydraulic oil tank 2 through the three-position reversing valve II 3-2.
When the three-position reversing valve I3-1 and the three-position reversing valve II 3-2 are both positioned at the left station, the pump 1 is used for taking hydraulic oil from the hydraulic oil tank 2 to supply oil to the small cavity of the bucket rod oil cylinder 8 and the large cavity of the movable arm oil cylinder 5, so that the action combination of lifting of the movable arm 9 and adduction of the bucket rod 10 is realized. When the three-position reversing valve I3-1 and the three-position reversing valve II 3-2 are both positioned at the right station, the pump 1 is used for taking hydraulic oil from the hydraulic oil tank 2 to supply oil to the large cavity of the bucket rod oil cylinder 8 and the small cavity of the movable arm oil cylinder 5, so that the action combination of the lowering of the movable arm 9 and the outward swinging of the bucket rod 10 is realized.
Preferably, the control valve group 3 is an integrated valve. The first working oil port of the three-position reversing valve I3-1 is connected with the oil port B1 of the control valve group 3, and the oil port B1 of the control valve group 3 is connected with the large cavity of the bucket rod oil cylinder 8. The second working oil port of the three-position reversing valve I3-1 is connected with the oil port A1 of the control valve group 3, and the oil port A1 of the control valve group 3 is connected with the small cavity of the bucket rod oil cylinder 8. The first working oil port of the three-position reversing valve II 3-2 is connected with the oil port B2 of the control valve group 3, and the oil port B2 of the control valve group 3 is connected with the small cavity of the movable arm oil cylinder 5. The second working oil port of the three-position reversing valve II 3-2 is connected with the oil port A2 of the control valve group 3, and the oil port A2 of the control valve group 3 is connected with the large cavity of the movable arm oil cylinder 5. The oil inlet of the three-position reversing valve I3-1 and the oil inlet of the three-position reversing valve II 3-2 are connected with the oil inlet P of the control valve group 3, and the oil inlet P of the control valve group 3 is connected with the hydraulic oil tank 2 through the pump 1. The oil return port of the three-position reversing valve I3-1 and the oil return port of the three-position reversing valve II 3-2 are connected with the oil return port T of the control valve bank 3, and the oil return port T of the control valve bank 3 is connected with the hydraulic oil tank 2.
As shown in FIG. 1, the three-position reversing valve I3-1 and the three-position reversing valve II 3-2 are electromagnetic reversing valves. When Y1 of the three-position reversing valve I3-1 and Y3 of the three-position reversing valve II 3-2 are powered on, the three-position reversing valve I3-1 and the three-position reversing valve II 3-2 are switched to the left station. When Y2 of the three-position reversing valve I3-1 and Y4 of the three-position reversing valve II 3-2 are powered on, the three-position reversing valve I3-1 and the three-position reversing valve II 3-2 are switched to the right station.
The large cavity of the leveling cylinder 6 is connected with the large cavity of the movable arm cylinder 5, and the small cavity of the leveling cylinder 6 is connected with the small cavity of the movable arm cylinder 5. During the combined operation of the boom 9 and the arm 10, the oil in the leveling cylinder 6 flows between the boom cylinder 5 and the leveling cylinder 6.
When the combined action of lifting the movable arm 9 and adducting the bucket rod 10 is needed, the Y1 of the three-position reversing valve I3-1 and the Y3 of the three-position reversing valve II 3-2 are powered, and the three-position reversing valve I3-1 and the three-position reversing valve II 3-2 are switched to the left station. The pump 1 drives hydraulic oil in the hydraulic oil tank 2 to enter a large cavity of the movable arm oil cylinder 5 and a small cavity of the bucket rod oil cylinder 8 respectively through the control valve group 3, and at the moment, the small cavity of the movable arm oil cylinder 5 and the large cavity of the bucket rod oil cylinder 8 are communicated with the hydraulic oil tank 2 through the control valve group 3. When the bucket rod 10 is in the bucket rod 10, the hydraulic oil in the large cavity of the leveling oil cylinder 6 is pushed to enter the large cavity of the movable arm oil cylinder 5 by the descending of the bucket rod 10, assistance is provided for lifting the movable arm, gravitational potential energy received by the bucket rod 10 is converted into kinetic energy for lifting the movable arm 9, and the movable arm 9 is pushed to be lifted.
When the combined action of the descending of the movable arm 9 and the outward swinging of the bucket rod 10 is needed, the Y2 of the three-position reversing valve I3-1 and the Y4 of the three-position reversing valve II 3-2 are powered, and the three-position reversing valve I3-1 and the three-position reversing valve II 3-2 are switched to the right station. The pump 1 drives hydraulic oil in the hydraulic oil tank 2 to enter a small cavity of the movable arm oil cylinder 5 and a large cavity of the bucket rod oil cylinder 8 respectively through the control valve group 3, and at the moment, the large cavity of the movable arm oil cylinder 5 and the small cavity of the bucket rod oil cylinder 8 are communicated with the hydraulic oil tank 2 through the control valve group 3. When the movable arm 9 descends, gravitational potential energy of the movable arm 9 can be converted into pressure oil in a large cavity of the movable arm oil cylinder 5, after the pressure oil is throttled by the one-way throttle valve 4, one part of the pressure oil returns to the hydraulic oil tank 2 through the control valve group 3, and the other part of the pressure oil enters the large cavity of the leveling oil cylinder 6 to push a piston rod of the leveling oil cylinder 6 to extend out, so that power is provided for the outward swing of the bucket rod 10, and the gravitational potential energy of the part of the movable arm 9 which descends is converted into power for the outward swing of the bucket rod 10, so that an energy-saving effect is achieved.
As shown in fig. 1, a main relief valve 3-3 is arranged between an oil inlet P of the control valve group 3 and an oil return port T of the control valve group 3, and the main relief valve 3-3 is used for limiting the highest use pressure of the system. Furthermore, overload overflow valves 3-4 are respectively arranged between the oil port B1 of the control valve group 3 and the oil return port T of the control valve group 3, between the oil port A1 of the control valve group 3 and the oil return port T of the control valve group 3, between the oil port B2 of the control valve group 3 and the oil return port T of the control valve group 3, and between the oil port A2 of the control valve group 3 and the oil return port T of the control valve group 3. The overload relief valve 3-4 can protect the oil cylinder when the oil cylinder encounters severe impact.
As shown in fig. 1, a one-way throttle valve 4 is arranged between the control valve group 3 and the large cavity of the movable arm cylinder 5, and an oil outlet of the one-way valve of the one-way throttle valve 4 is connected with the large cavity of the movable arm cylinder 5. When the movable arm 9 descends, the oil return throttling of the large cavity of the movable arm oil cylinder 5 can effectively control the descending speed of the movable arm 9, and the damage to the oil cylinder caused by suction of the small cavity of the movable arm oil cylinder 5 due to the fact that the movable arm 9 descends too fast is prevented.
As an improvement of the embodiment, the oil inlet of the three-position reversing valve I3-1 and the oil inlet of the three-position reversing valve II 3-2 are respectively provided with a one-way valve. And the hydraulic oil is prevented from flowing back when the oil cylinder encounters severe impact.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical principles of the present invention are within the scope of the technical solutions of the present invention.
Claims (6)
1. An energy-efficient hydraulic system for a face shovel excavator work device, characterized by: the hydraulic control system comprises a control valve group (3), a movable arm oil cylinder (5) and a bucket rod oil cylinder (8), wherein the control valve group (3) comprises a three-position reversing valve I (3-1) and a three-position reversing valve II (3-2); two working oil ports of the three-position reversing valve I (3-1) are respectively connected with a large cavity of the bucket rod oil cylinder (8) and a small cavity of the bucket rod oil cylinder (8); two working oil ports of the three-position reversing valve II (3-2) are respectively connected with a large cavity of the movable arm oil cylinder (5) and a small cavity of the movable arm oil cylinder (5); the oil inlet of the three-position reversing valve I (3-1) and the oil inlet of the three-position reversing valve II (3-2) are connected with the pump (1), and the oil return port of the three-position reversing valve I (3-1) and the oil return port of the three-position reversing valve II (3-2) are connected with the hydraulic oil tank (2); the device also comprises a leveling oil cylinder (6) arranged between the movable arm and the bucket rod, wherein a large cavity of the leveling oil cylinder (6) is connected with a large cavity of the movable arm oil cylinder (5), and a small cavity of the leveling oil cylinder (6) is connected with a small cavity of the movable arm oil cylinder (5).
2. The economizer hydraulic system for a face shovel work device of claim 1 wherein: the control valve group (3) is an integrated valve, a first working oil port of the three-position reversing valve I (3-1) is connected with an oil port B1 of the control valve group (3), and a second working oil port of the three-position reversing valve I (3-1) is connected with an oil port A1 of the control valve group (3); the first working oil port of the three-position reversing valve II (3-2) is connected with the oil port B2 of the control valve group (3), and the second working oil port of the three-position reversing valve II (3-2) is connected with the oil port A2 of the control valve group (3); the oil inlet of the three-position reversing valve I (3-1) and the oil inlet of the three-position reversing valve II (3-2) are connected with the oil inlet P of the control valve group (3), and the oil return port of the three-position reversing valve I (3-1) and the oil return port of the three-position reversing valve II (3-2) are connected with the oil return port T of the control valve group (3).
3. The economizer hydraulic system for a face shovel work device of claim 2 wherein: a main overflow valve (3-3) is arranged between an oil inlet P of the control valve group (3) and an oil return port T of the control valve group (3).
4. The economizer hydraulic system for a face shovel work device of claim 2 wherein: overload overflow valves are arranged between an oil port B1 of the control valve group (3) and an oil return port T of the control valve group (3), between an oil port A1 of the control valve group (3) and the oil return port T of the control valve group (3), between an oil port B2 of the control valve group (3) and the oil return port T of the control valve group (3) and between the oil port A2 of the control valve group (3) and the oil return port T of the control valve group (3).
5. The economizer hydraulic system for a face shovel work device according to any one of claims 1 to 4, wherein: a one-way throttle valve (4) is arranged between the control valve group (3) and the large cavity of the movable arm oil cylinder (5), and an oil outlet of the one-way valve of the one-way throttle valve (4) is connected with the large cavity of the movable arm oil cylinder (5).
6. The economizer hydraulic system for a face shovel work device according to any one of claims 1 to 4, wherein: the oil inlet of the three-position reversing valve I (3-1) and the oil inlet of the three-position reversing valve II (3-2) are both provided with one-way valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210635669.2A CN114934552B (en) | 2022-06-07 | 2022-06-07 | Energy-saving hydraulic system for working device of front shovel excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210635669.2A CN114934552B (en) | 2022-06-07 | 2022-06-07 | Energy-saving hydraulic system for working device of front shovel excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114934552A CN114934552A (en) | 2022-08-23 |
| CN114934552B true CN114934552B (en) | 2023-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210635669.2A Active CN114934552B (en) | 2022-06-07 | 2022-06-07 | Energy-saving hydraulic system for working device of front shovel excavator |
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| CN (1) | CN114934552B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10306470A (en) * | 1997-04-30 | 1998-11-17 | Hitachi Constr Mach Co Ltd | Hydraulic drive device of construction machine |
| CN104328812A (en) * | 2014-09-23 | 2015-02-04 | 徐州徐工挖掘机械有限公司 | Hydraulic system for realizing flat pushing function of forward excavator |
| CN108316389A (en) * | 2018-04-16 | 2018-07-24 | 福建晋工机械有限公司 | A kind of wheel excavator multi-way valve |
| CN110359516A (en) * | 2019-07-24 | 2019-10-22 | 青岛雷沃工程机械有限公司 | Descending movable arm of excavator hydraulic control system and excavator |
| CN112127400A (en) * | 2020-10-09 | 2020-12-25 | 南京工程学院 | Excavator bucket follow-up control system and method |
| CN113882459A (en) * | 2021-09-30 | 2022-01-04 | 徐州徐工挖掘机械有限公司 | Excavator energy recovery system and excavator |
-
2022
- 2022-06-07 CN CN202210635669.2A patent/CN114934552B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10306470A (en) * | 1997-04-30 | 1998-11-17 | Hitachi Constr Mach Co Ltd | Hydraulic drive device of construction machine |
| CN104328812A (en) * | 2014-09-23 | 2015-02-04 | 徐州徐工挖掘机械有限公司 | Hydraulic system for realizing flat pushing function of forward excavator |
| CN108316389A (en) * | 2018-04-16 | 2018-07-24 | 福建晋工机械有限公司 | A kind of wheel excavator multi-way valve |
| CN110359516A (en) * | 2019-07-24 | 2019-10-22 | 青岛雷沃工程机械有限公司 | Descending movable arm of excavator hydraulic control system and excavator |
| CN112127400A (en) * | 2020-10-09 | 2020-12-25 | 南京工程学院 | Excavator bucket follow-up control system and method |
| CN113882459A (en) * | 2021-09-30 | 2022-01-04 | 徐州徐工挖掘机械有限公司 | Excavator energy recovery system and excavator |
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| Publication number | Publication date |
|---|---|
| CN114934552A (en) | 2022-08-23 |
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