CN108625425B - Hydraulic system for ultra-large excavator - Google Patents
Hydraulic system for ultra-large excavator Download PDFInfo
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- CN108625425B CN108625425B CN201810622427.3A CN201810622427A CN108625425B CN 108625425 B CN108625425 B CN 108625425B CN 201810622427 A CN201810622427 A CN 201810622427A CN 108625425 B CN108625425 B CN 108625425B
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- 239000003921 oil Substances 0.000 claims abstract description 115
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 8
- 238000012827 research and development Methods 0.000 abstract description 5
- 230000000712 assembly Effects 0.000 abstract description 2
- 238000000429 assembly Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 206010015856 Extrasystoles Diseases 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention discloses a hydraulic system for an ultra-large excavator, which belongs to a hydraulic system of an excavator. The hydraulic control system mainly comprises a main valve, an executive element, a pilot assembly, an engine assembly and a hydraulic oil tank; the main valve is connected with the valve in parallel, the main valve is connected with the actuating element in parallel, the pilot oil ports of the main valve and the valve are connected with the pilot assembly, the oil inlet of the main pump assembly is connected with the hydraulic oil tank, the oil outlet of the main pump assembly is connected with the main valve and the valve, and the main pump assembly is connected with the engine assembly. The invention adopts two small valve assemblies to replace the original large valve assembly, thereby greatly saving the cost, reducing the research and development difficulty and breaking the monopoly situation of the ultra-large excavator. The invention is mainly used for ultra-large excavator.
Description
Technical Field
The invention belongs to a hydraulic system of an excavator, and particularly relates to a hydraulic system for an ultra-large excavator.
Background
The ultra-large excavator, especially the ultra-large excavator with more than hundred tons, is mainly applied to large-scale construction such as development of large mineral resources, large-scale infrastructure, sea-filling land-making engineering and the like, and is monopoly by foreign resource brands for many years. The most advanced technology in the field of the excavator is concentrated, so that the equipment is expensive, and the core hydraulic system is more expensive. The hydraulic system of the excavator is a core control and action system of the excavator, which determines the oil supply line and the oil supply mode of the hydraulic pump to each hydraulic action element, the flow distribution when a plurality of hydraulic execution elements act simultaneously and how to realize compound action, and determines the characteristics of kinematics and dynamics, action priority and cooperation, confluence oil supply, linear walking and the like when the excavator works.
At present, as the tonnage of the excavator is continuously increased from a medium-sized excavator to an ultra-large excavator, the main valve with larger diameter of the valve rod is replaced, so that the hydraulic system is ensured to have enough flow, the appearance, the weight and the processing difficulty of the main valve body are continuously increased, the cost and the price of the hydraulic system are multiplied, and meanwhile, the research and development and the manufacturing difficulty are higher, and the stock quantity is larger.
Disclosure of Invention
The invention aims to overcome the defects and provide the hydraulic system for the ultra-large excavator, which adopts two small valve assemblies to replace the original large valve assembly, thereby greatly saving the cost, reducing the research and development difficulty and breaking the monopoly situation of the ultra-large excavator.
The hydraulic system for the ultra-large excavator comprises a main valve, an executive element, a pilot assembly, an engine assembly and a hydraulic oil tank; the main valve is connected with the valve in parallel, the main valve is connected with the actuating element in parallel, the pilot oil ports of the main valve and the valve are connected with the pilot assembly, the oil inlet of the main pump assembly is connected with the hydraulic oil tank, the oil outlet of the main pump assembly is connected with the main valve and the valve, and the main pump assembly is connected with the engine assembly.
Further, the main valve comprises a movable arm first link, a movable arm second link, a bucket rod first link, a bucket first link, a rotary first link, a left walking link, a right walking link, a standby link and a straight walking link.
Further, the valve comprises a movable arm triplet, a bucket triplet and a rotary triplet; the first movable arm link and the second movable arm link are connected in parallel with the third movable arm link, the first bucket arm link and the second bucket arm link are connected in parallel with the third bucket arm link, and the first bucket link is connected in parallel with the second bucket link, and the first rotary link is connected in parallel with the second rotary link.
Further, the executing element comprises a bucket oil cylinder, a movable arm oil cylinder, a rotary motor, a bucket rod oil cylinder and a walking motor, wherein the bucket one-way joint is connected with the bucket oil cylinder after being connected with the bucket two-way joint in parallel, the movable arm one-way joint is connected with the movable arm oil cylinder after being connected with the movable arm three-way joint in parallel, the rotary one-way joint is connected with the rotary motor after being connected with the rotary two-way joint in parallel, the bucket rod one-way joint is connected with the bucket rod oil cylinder after being connected with the bucket rod three-way joint in parallel, and the left walking joint and the right walking joint are connected with the walking motor.
Further, the pilot assembly includes a left traveling pilot and right traveling pilot assembly, a bucket pilot and boom pilot assembly, and a swing pilot and stick pilot assembly.
Further, the left traveling guide assembly and the right traveling guide assembly respectively control the left traveling link and the right traveling link of the main valve to realize the oil supply of the main valve to the traveling motor.
Further, the bucket pilot and the movable arm pilot assembly control the bucket union of the main valve, the bucket union of the valve, the movable arm union of the main valve and the movable arm union of the valve, so that the main valve and the valve can supply oil to the bucket cylinder and the movable arm cylinder in a merging way respectively.
Further, the rotary pilot and the bucket rod pilot assembly respectively control the rotary one-way joint of the main valve, the rotary two-way joint of the valve, the bucket rod one-way joint of the main valve, the bucket rod two-way joint of the valve and the bucket rod three-way joint of the valve, so that the main valve and the valve can respectively supply oil to the rotary motor and the bucket rod oil cylinder in a converging way.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts the small main valve and the newly added valve used by the medium-sized and large-sized excavator to be connected in parallel to replace the existing large-sized traditional main valve, solves the problems of huge volume and difficult processing and manufacturing of the traditional main valve, and reduces the research and development cost and the manufacturing cost of the hydraulic system of the ultra-large-sized excavator;
2. the hydraulic system of the ultra-large excavator and the hydraulic system of the medium-large excavator in the prior art are not universal, and the original main valve and the newly added valve are matched, so that the hydraulic system of the ultra-large excavator and the hydraulic system for the medium-large excavator share one platform, most of elements are universal, only one set of system is needed for standby, and the inventory of the hydraulic system is greatly reduced;
3. the hydraulic systems of the ultra-large excavator and the medium-large excavator are universal, so that the use and the operation are simpler, and the labor intensity of workers is obviously reduced;
4. the hydraulic systems of the ultra-large excavator and the medium-large excavator share the same whole machine big data, so that research and development personnel can put more effort into the aspects of power matching, pipeline optimization, noise reduction, service life prolonging and the like, the performances of various aspects of products are further improved, and the situation that the ultra-large excavator is monopoly by foreign brands is solved.
Drawings
FIG. 1 is a schematic system diagram of a medium or large excavator;
FIG. 2 is a schematic diagram of a system of the present invention;
FIG. 3 is a system schematic diagram of a main valve;
FIG. 4 is a schematic diagram of a system of valves;
FIG. 5 is an enlarged partial view of portion A of FIG. 2;
FIG. 6 is an enlarged partial view of portion B of FIG. 2;
FIG. 7 is an enlarged partial view of portion C of FIG. 2;
FIG. 8 is a front view of the main valve;
FIG. 9 is a cross-sectional view taken along line A-A of FIG. 8;
FIG. 10 is a cross-sectional view taken along B-B in FIG. 8;
fig. 11 is a front view of the valve;
fig. 12 is a cross-sectional view taken along line C-C of fig. 11.
In the figure, 1, a main valve; 2. a valve; 3. a pilot assembly; 4. a bucket cylinder; 5. a boom cylinder; 6. left walking guide and right walking guide assembly; 7. a confluence valve block; 8. bucket pilot and boom pilot assembly; 9. a rotary pilot and bucket rod pilot assembly; 10. a rubber tube; 11. a logic valve block; 12. a solenoid valve block; 13. a pilot oil source; 14. a main pump assembly; 15. an engine assembly; 16. a hydraulic oil tank; 17. a rotary motor; 18. a bucket rod oil cylinder; 19. a walking motor; 20. bucket rod bigeminy; 21. the bucket is connected in series; 22. the movable arm is connected in one; 23. a right walking link; 24. a straight line walking link; 25. the bucket rod is connected in one piece; 26. standby connection; 27. rotating the first connection; 28. the movable arm is connected in a duplex way; 29. left walking is connected; 30. the bucket rod is trigeminy; 31. bucket doublets; 32. rotating the two joints; 33. the movable arm is trigeminy.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 2, the hydraulic system for an ultra-large excavator includes a main valve 1, a valve 2, an actuator, a pilot assembly 3, a main pump assembly 14, an engine assembly 15, and a hydraulic tank 16; the main valve 1 and the valve 2 are connected in parallel through a rubber tube 10, the main valve 1 and the valve 2 are connected in parallel and then connected with an executing element, pilot oil ports of the main valve 1 and the valve 2 are connected with a pilot assembly 3, the pilot assembly 3 is connected with a converging valve block 7, the converging valve block 7 is connected with a main pump assembly through a solenoid valve block 12 and a pilot oil source 13, an oil inlet of a main pump assembly 14 is connected with a hydraulic oil tank 16, an oil outlet of the main pump assembly 14 is connected with the main valve 1 and the valve 2, and the main pump assembly 14 is connected with an engine assembly 15.
As shown in fig. 3 and 8 to 10, the main valve 1 includes a boom unit 22, a boom unit 28, an arm unit 25, an arm unit 20, a bucket unit 21, a swing unit 27, a left travel unit 29, a right travel unit 23, a reserve unit 26, and a straight travel unit 24.
As shown in fig. 4 and 11 to 12, the valve 2 includes a boom triple 33, an arm triple 30, a bucket triple 31, and a swing double 32; the boom linkage 22 and the boom linkage 28 are connected in parallel with the boom linkage 33, the arm linkage 25 and the arm linkage 20 are connected in parallel with the arm linkage 30, the bucket linkage 21 is connected in parallel with the bucket linkage 31, and the swing linkage 27 is connected in parallel with the swing linkage 32.
As shown in fig. 5-7, the executing element comprises a bucket cylinder 4, a movable arm cylinder 5, a rotary motor 17, a bucket rod cylinder 18 and a traveling motor 19, wherein a bucket first link 21 is connected with the bucket cylinder 4 after being connected with a bucket third link 31 in parallel, a movable arm first link 22 and a movable arm third link 28 are connected with the movable arm cylinder 5 after being connected with a movable arm third link 33 in parallel, a rotary first link 27 is connected with the rotary motor 17 after being connected with a rotary third link 32 in parallel, a bucket rod first link 25 and a bucket rod third link 20 are connected with the bucket rod cylinder 18 after being connected with a bucket rod third link 30 in parallel, and a left traveling link 29 and a right traveling link 23 are connected with the traveling motor 19;
the pilot assembly 3 comprises a left traveling pilot and right traveling pilot assembly 6, a bucket pilot and movable arm pilot assembly 8 and a rotary pilot and bucket rod pilot assembly 9; the left traveling guide and the right traveling guide assembly 6 are directly connected with a guide oil port of the main valve 1, and the bucket guide and the movable arm guide assembly 8 and the rotary guide and bucket rod guide assembly 9 are connected with the guide oil port of the main valve 1 through a logic valve block 11; the left traveling guide assembly 6 and the right traveling guide assembly 6 respectively control the left traveling link 29 and the right traveling link 23 of the main valve 1 to realize that the main valve 1 supplies oil to the traveling motor 19; the bucket pilot and the movable arm pilot assembly 8 control the bucket one-way 21 of the main valve 1, the bucket one-way 31 of the valve 2, the movable arm one-way 22 of the main valve 1, the movable arm one-way 28 of the valve 2 and the movable arm three-way 33 of the valve 2, so that the main valve 1 and the valve 2 can respectively supply oil to the bucket cylinder 4 and the movable arm cylinder 5 in a merging way; the rotary pilot and arm pilot assembly 9 controls the rotary union 27 of the main valve 1, the rotary union 32 of the valve 2, the arm union 25 of the main valve 1, the arm union 20 of the valve 2, and the arm union 30 of the valve 2, thereby realizing the combined oil supply of the main valve 1 and the valve 2 to the rotary motor 17 and the arm cylinder 18, respectively.
As shown in fig. 3 and 4, in operation of the present invention, the boom cylinder 5 operates by different combinations of the boom pilot control main valve 1 and the valve 2: the pilot oil ports 4pa2, 5pa2 and pb1 are used for oil supply, the movable arm one-way 22 and the movable arm two-way 28 are moved to the right, and the movable arm three-way 33 is moved to the left, so that the oil ports 4A2 and B1 are converged to supply oil to a large cavity of the movable arm oil cylinder 5, and the oil port 4B2 returns oil, and the movable arm is lifted; otherwise, the pilot oil ports 4pb2, 5pb2 and pa1 are used for oil feeding, the movable arm one-way 22 and the movable arm two-way 28 are moved left, and the movable arm three-way 33 is moved right, so that oil port 4B2 is used for supplying oil to the small cavity of the movable arm oil cylinder 5, oil ports 4A2 and B1 are used for oil returning, and the movable arm is enabled to finish descending.
The arm cylinder 18 operates by different combinations of the arm pilot control main valve 1 and the valve 2: the pilot oil ports 5pb5, 4pa4 and pb4 are used for oil communication, the bucket rod one-joint 25 and the bucket rod three-joint 30 move left, and the bucket rod two-joint 20 moves right; therefore, the oil ports 5B5 and B4 are converged to the small cavity of the bucket rod oil cylinder 18 for oil supply, and the oil ports 5A5 and A4 return oil, so that the bucket rod completes stretching action; conversely, the pilot oil ports 5pa5, 4pb4 and pa4 are used for oil communication, the bucket rod one-joint 25 and the bucket rod three-joint 30 move right, and the bucket rod two-joint 20 moves left; therefore, the oil ports 5A5 and A4 are converged to the large cavity of the bucket rod oil cylinder 18 for oil supply, and the oil ports 5B5 and B4 return oil, so that the bucket rod completes the shrinkage action.
The bucket cylinder 4 operates by a different linkage of the bucket pilot control main valve 1 and the valve 2: the pilot oil ports 4pa3 and pb3 are communicated with oil, the bucket pair 21 moves right, and the bucket pair 31 moves left; therefore, the oil port 4A3 supplies oil to the large cavity of the bucket oil cylinder 4, and the oil port 4B3 returns oil, so that the bucket finishes the contraction action; conversely, the pilot oil ports 4pb3 and pa3 are communicated with oil, the bucket pair 21 moves left and the bucket pair 31 moves right; therefore, the oil ports 4B3 and A3 are converged to the small cavity of the bucket oil cylinder 4 for oil supply, and the oil port A3 returns oil, so that the bucket completes stretching action.
The swing motor 17 operates by a different linkage between the swing pilot control main valve 1 and the valve 2: the pilot oil ports 5pa3 and pa2 are communicated with oil, the rotary union 27 moves right, and the rotary union 32 moves right; thereby realizing that the oil ports 5A3 and A2 are converged to the rotary motor 17 for oil supply, and the oil ports 5B3 and B2 return oil, so that the rotary motor 17 rotates to one side; otherwise, the pilot oil ports 5pb3 and pb2 are communicated with oil, the rotary union 27 moves left, and the rotary union 32 moves left; thereby realizing that the oil ports 5B3 and B2 are converged to the rotary motor 17 for oil supply, and the oil ports 5A3 and A2 return oil, so that the rotary motor 17 rotates towards the other side.
The travel motor 19 operates by a different linkage between the left and right travel pilot control main valves 1 and the valve 2: the pilot oil ports 5pa1 and 4pa1 are communicated with oil, the left traveling link 29 moves right, and the right traveling link 23 moves right; thereby realizing that the oil ports 5A1 and 4A1 supply oil to the walking motor 19, and the oil ports 5B1 and 4B1 return oil, so that the walking motor 19 walks to one side; otherwise, the pilot oil ports 5pb1 and 4pb1 are used for oil communication, and the left traveling link 29 moves left and the right traveling link 23 moves left; thereby realizing that the oil ports 5B1 and 4B1 supply oil to the traveling motor 19, and the oil ports 5A1 and 4A1 return oil, so that the traveling motor 19 travels to the other side.
Claims (5)
1. A hydraulic system for an ultra-large excavator comprises a main valve (1), an executive element, a pilot assembly (3), an engine assembly (15) and a hydraulic oil tank (16); the method is characterized in that: the hydraulic control system comprises a main valve (1), a main valve (2), a pilot oil port of the main valve (1) and a pilot oil port of the main valve (2), a pilot assembly (3), a confluence valve block (7), an electromagnetic valve block (12) and a pilot oil source (13), a main pump assembly (14), an oil inlet of the main pump assembly (14), a hydraulic oil tank (16) and an oil outlet of the main pump assembly (14), the main valve (1) and the main valve (2) are connected in parallel, the pilot oil port of the main valve (1) and the main valve (2) is connected with the pilot assembly (3), the confluence valve block (7) is connected with the confluence valve block (7), the oil inlet of the main pump assembly (14) is connected with an engine assembly (15); the main valve (1) comprises a movable arm first link (22), a movable arm second link (28), a bucket rod first link (25), a bucket rod second link (20), a bucket first link (21), a rotary first link (27), a left walking link (29), a right walking link (23), a standby link (26) and a straight walking link (24); the valve (2) comprises a movable arm triple (33), a bucket arm triple (30), a bucket double (31) and a rotary double (32); the movable arm one-way (22) and the movable arm two-way (28) are connected with the movable arm three-way (33) in parallel, the bucket rod one-way (25) and the bucket rod two-way (20) are connected with the bucket rod three-way (30) in parallel, the bucket one-way (21) is connected with the bucket two-way (31) in parallel, and the rotary one-way (27) is connected with the rotary two-way (32) in parallel; the actuating element comprises a bucket oil cylinder (4), a movable arm oil cylinder (5), a rotary motor (17), a bucket rod oil cylinder (18) and a traveling motor (19), wherein the bucket one-way (21) is connected with the bucket oil cylinder (4) after being connected with the bucket two-way (31) in parallel, the movable arm one-way (22) and the movable arm two-way (28) are connected with the movable arm oil cylinder (5) after being connected with the movable arm three-way (33) in parallel, the rotary one-way (27) is connected with the rotary motor (17) after being connected with the rotary two-way (32) in parallel, the bucket rod one-way (25) and the bucket rod two-way (20) are connected with the bucket rod oil cylinder (18) after being connected with the bucket rod three-way (30) in parallel, and the left traveling two-way (29) and the right traveling two-way (23) are connected with the traveling motor (19).
2. The hydraulic system for an ultra-large excavator according to claim 1, wherein: the pilot assembly (3) comprises a left traveling pilot and right traveling pilot assembly (6), a bucket pilot and movable arm pilot assembly (8) and a rotary pilot and bucket rod pilot assembly (9).
3. The hydraulic system for an ultra-large excavator according to claim 2, wherein: the left traveling guide assembly (6) and the right traveling guide assembly respectively control the left traveling link (29) and the right traveling link (23) of the main valve (1) to realize the oil supply of the main valve (1) to the traveling motor (19).
4. The hydraulic system for an ultra-large excavator according to claim 2, wherein: the bucket pilot and the movable arm pilot assembly (8) respectively control the bucket one-way (21) of the main valve (1), the bucket one-way (31) of the valve (2), the movable arm one-way (22) and the movable arm one-way (28) of the main valve (1) and the movable arm three-way (33) of the valve (2), so that the main valve (1) and the valve (2) respectively supply oil to the bucket oil cylinder (4) and the movable arm oil cylinder (5) in a merging way.
5. The hydraulic system for an ultra-large excavator according to claim 2, wherein: the rotary pilot and the bucket rod pilot assembly (9) respectively control the rotary one-way joint (27) of the main valve (1), the rotary two-way joint (32) of the valve (2), the bucket rod one-way joint (25) and the bucket rod two-way joint (20) of the main valve (1) and the bucket rod three-way joint (30) of the valve (2), so that the main valve (1) and the valve (2) respectively supply oil to the rotary motor (17) and the bucket rod oil cylinder (18) in a merging way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810622427.3A CN108625425B (en) | 2018-06-15 | 2018-06-15 | Hydraulic system for ultra-large excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810622427.3A CN108625425B (en) | 2018-06-15 | 2018-06-15 | Hydraulic system for ultra-large excavator |
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| Publication Number | Publication Date |
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| CN108625425A CN108625425A (en) | 2018-10-09 |
| CN108625425B true CN108625425B (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810622427.3A Active CN108625425B (en) | 2018-06-15 | 2018-06-15 | Hydraulic system for ultra-large excavator |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114351786B (en) * | 2021-12-25 | 2023-06-09 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic main valve and system of ultra-large mining excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08199633A (en) * | 1995-01-20 | 1996-08-06 | Komatsu Ltd | Oil hydraulic circuit for hydraulic shovel |
| CN103603971A (en) * | 2013-12-04 | 2014-02-26 | 湘潭大学 | Multi-way valve with single oil duct and double valve elements in parallel connection and used for high-power excavator |
| CN104019071A (en) * | 2014-06-10 | 2014-09-03 | 山东中川液压有限公司 | Energy-saving hydraulic valve used for hydraulic excavator |
| CN106640820A (en) * | 2017-01-22 | 2017-05-10 | 山东常林机械集团股份有限公司 | Multipath control valve |
| CN208346894U (en) * | 2018-06-15 | 2019-01-08 | 山东临工工程机械有限公司 | Ultra-large type excavator hydraulic system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4734196B2 (en) * | 2006-08-10 | 2011-07-27 | 日立建機株式会社 | Hydraulic drive device for large excavator |
-
2018
- 2018-06-15 CN CN201810622427.3A patent/CN108625425B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08199633A (en) * | 1995-01-20 | 1996-08-06 | Komatsu Ltd | Oil hydraulic circuit for hydraulic shovel |
| CN103603971A (en) * | 2013-12-04 | 2014-02-26 | 湘潭大学 | Multi-way valve with single oil duct and double valve elements in parallel connection and used for high-power excavator |
| CN104019071A (en) * | 2014-06-10 | 2014-09-03 | 山东中川液压有限公司 | Energy-saving hydraulic valve used for hydraulic excavator |
| CN106640820A (en) * | 2017-01-22 | 2017-05-10 | 山东常林机械集团股份有限公司 | Multipath control valve |
| CN208346894U (en) * | 2018-06-15 | 2019-01-08 | 山东临工工程机械有限公司 | Ultra-large type excavator hydraulic system |
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| CN108625425A (en) | 2018-10-09 |
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