CN107939753B - Hydraulic oil tank of excavator and oil quantity control method - Google Patents
Hydraulic oil tank of excavator and oil quantity control method Download PDFInfo
- Publication number
- CN107939753B CN107939753B CN201711190723.2A CN201711190723A CN107939753B CN 107939753 B CN107939753 B CN 107939753B CN 201711190723 A CN201711190723 A CN 201711190723A CN 107939753 B CN107939753 B CN 107939753B
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- tank body
- oil tank
- excavator
- control module
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- 239000003921 oil Substances 0.000 title claims abstract description 341
- 239000010720 hydraulic oil Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 239000013589 supplement Substances 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000005484 gravity Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000945 filler Substances 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
-
- 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
-
- 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
- F15B21/005—Filling or draining of fluid systems
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Component Parts Of Construction Machinery (AREA)
Abstract
The invention relates to the technical field of excavators, in particular to a hydraulic oil tank of an excavator and an oil quantity control method. The invention discloses a hydraulic oil tank of an excavator, wherein a lower oil tank body is arranged on a lower frame, so that the oil tank body is convenient for oiling operation, and the problem that the size of the oil tank body is limited due to small space of an upper frame is effectively solved; and the gravity center of the excavator body can be lowered, so that the excavator runs and operates more stably. And the lower oil tank body is communicated with the upper oil tank body through the oil suction pump, and the oil quantity of the upper oil tank body is effectively ensured according to a controllable oil quantity control method. The overall structure of the hydraulic oil tank effectively utilizes the space of the upper frame and the lower frame, stores enough hydraulic oil for the operation of the excavator, and meets the normal operation of the excavator.
Description
Technical Field
The invention relates to the technical field of excavators, in particular to a hydraulic oil tank of an excavator and an oil quantity control method.
Background
The hydraulic system of the excavator needs to store hydraulic oil (energy) for each hydraulic oil cylinder through a hydraulic oil tank so as to realize different actions of the excavator. The hydraulic oil tank is used as a basis of the whole hydraulic system, and the reliability of the whole hydraulic system and the working efficiency of the excavator are related.
The existing hydraulic oil tank is generally only one and is arranged on the upper frame of the excavator, and the size of the hydraulic oil tank is limited due to the smaller space of the upper frame, so that the hydraulic oil tank is difficult to meet long-time operation and use of the excavator. And the height of the general excavator is higher, and the hydraulic oil tank is arranged on the upper frame, so that the hydraulic oil tank is inconvenient to add hydraulic oil.
Disclosure of Invention
The invention aims to overcome the defects and provide a hydraulic oil tank of an excavator and an oil quantity control method.
In order to achieve the above object, the technical solution of the present invention is: the hydraulic oil tank of the excavator comprises an upper frame, upper hydraulic control equipment arranged on the upper frame, a central rotating structure and a lower frame. The hydraulic oil tank of the excavator comprises a lower oil tank body and an upper oil delivery pipe; the lower oil tank body is arranged on the lower frame and comprises a lower oil port. One end of the upper oil delivery pipe is connected to the lower oil port, and the other end of the upper oil delivery pipe is connected to upper hydraulic control equipment of the upper frame through a central rotating structure to provide operation energy for the upper hydraulic control equipment. The oil tank body is arranged on the lower frame, so that the oil tank body is convenient to refuel, and the problem that the size of the oil tank body is limited due to small space of the upper frame is effectively solved; and the gravity center of the excavator body can be lowered, so that the excavator runs and operates more stably.
Preferably, the vehicle further comprises an upper oil tank body, an oil suction pump, a communicating oil delivery pipe and a central control module, wherein the upper oil tank body, the oil suction pump, the communicating oil delivery pipe and the central control module are arranged on the upper frame; the upper oil tank body comprises an upper oil suction port and an upper oil filling port; the oil suction pump is electrically connected with the central control module and is controlled by the central control module to operate; the oil suction pump is an electronic oil suction pump and is arranged at an upper oil filling port of the upper oil tank body; the upper end of the communicating oil delivery pipe is connected with the oil suction pump, and the lower end of the communicating oil delivery pipe is connected with the oil outlet; one end of the upper oil delivery pipe is connected with the upper oil suction port, and the other end of the upper oil delivery pipe is connected with upper hydraulic control equipment of the upper frame. The upper frame and the lower frame are respectively provided with an oil tank body, which is equivalent to dividing one oil tank body in the existing excavator into two parts, so that the integral oil storage capacity of the excavator can be increased; oiling the upper oil tank body through an oil suction pump; the oil filling port is arranged on the lower frame, so that the oil filling is convenient, and the oil quantity of the upper oil tank body is ensured to be sufficient.
Preferably, the device also comprises a tee joint structure which is arranged on the communicating oil delivery pipe; the three-way joint is electrically connected with the central control module and is controlled by the central control module to selectively refuel the upper oil tank body or the lower oil tank body.
Preferably, the volume of the lower oil tank body is smaller than that of the upper oil tank body, so that the excessive oil pumping of the upper oil tank body from the lower oil tank body through the oil sucking pump is avoided, and the upper oil tank body is prevented from overflowing. The volume of the lower oil tank body is preferably 80% of the volume of the upper oil tank body.
Preferably, an oil pointer is arranged in the upper oil tank body and is electrically connected with the central control module; the oil level is used for monitoring the oil quantity in the upper oil tank.
Preferably, the upper oil suction port is positioned below the upper oil tank body; the upper oil suction port is provided with an oil suction flange, an oil suction filter element is connected to the upper surface of the oil suction flange, and the oil suction filter element is arranged in the upper oil tank body; an oil absorption filter element mounting port is arranged on the upper oil tank body; the oil absorption filter core upper portion is equipped with the fixing base, and oil absorption filter core installing port is equipped with the installation lid that matches with the fixing base. The installation port of the filter element is arranged on the upper oil tank body, so that the problems of waste of hydraulic oil and troublesome operation during installation of the filter from the lower surface of the upper oil tank body are effectively solved. And through fixing base and installation lid cooperation operation, can be with the oil absorption filter core, firmly install in the oil absorption flange, ensure that it plays corresponding effect.
Preferably, the fixing seat is provided with a groove with an upward opening, and a spring is arranged in the groove; the middle below the installation cover is provided with a downward protruding top block, the top block is sleeved in the groove, the spring is pressed downwards, and then the oil absorption filter element is propped against the oil absorption flange downwards. The spring is arranged in the groove of the fixing seat, and the action of the floating force of hydraulic oil in the box body on the filter element can be counteracted by utilizing the elastic force of the spring, so that the oil absorption filter element is tightly connected with the oil absorption flange.
Preferably, the central control module is internally provided with a VECU unit.
The oil quantity control method of the hydraulic oil tank of the excavator is characterized in that the central control module timely supplements oil for the upper oil tank body through an oil level gauge and an oil suction pump, and the oil supplementing steps are as follows:
a. setting a threshold value of the oil quantity in the upper oil tank through the central control module;
b. setting the maximum idle time T of the oil suction pump through the central control module;
c. The oil level transmits the oil quantity condition in the upper oil tank body to the central control module in real time, when the oil quantity in the upper oil tank body is lower than a threshold value, the oil suction pump automatically starts oil suction operation, otherwise, the oil level continuously monitors the oil quantity condition in the upper oil tank body;
d. In the time T, the oil sucking pump pumps oil from the lower oil tank body through the communicating oil conveying pipe, so that the oil sucking pump sucks the oil until the oiling of the upper oil tank body is completed; when the time T is exceeded, the oil suction pump does not pump oil from the lower oil tank body through the communicated oil delivery pipe, and the oil suction pump stops working.
The oil quantity in the upper oil tank body is controlled by the oil quantity control method, so that the oil quantity in the upper oil tank body is ensured to be sufficient, and the normal operation of the excavator is met.
By adopting the technical scheme, the invention has the beneficial effects that: the invention discloses a hydraulic oil tank of an excavator, wherein a lower oil tank body is arranged on a lower frame, so that the oil tank body is convenient for oiling operation, and the problem that the size of the oil tank body is limited due to small space of an upper frame is effectively solved; and the gravity center of the excavator body can be lowered, so that the excavator runs and operates more stably. And the lower oil tank body is communicated with the upper oil tank body through the oil suction pump, and the oil quantity of the upper oil tank body is effectively ensured according to a controllable oil quantity control method. The overall structure of the hydraulic oil tank effectively utilizes the space of the upper frame and the lower frame, stores enough hydraulic oil for the operation of the excavator, and meets the normal operation of the excavator.
Drawings
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 3 is a schematic view of the structure of the oil tank body in embodiment 2 of the present invention;
FIG. 4 is a schematic structural view of embodiment 3 of the present invention
FIG. 5 is a control electric schematic block diagram of embodiment 3 of the present invention;
Fig. 6 is a flowchart of the oil amount control method of the present invention.
The main reference numerals illustrate: (1, an upper frame, 2, a central rotating structure, 20, an upper hydraulic control device, 3, a lower frame, 4, a lower oil tank body, 41, a lower oil port, 5, an upper oil delivery pipe, 6, an upper oil tank body, 61, an upper oil suction port, 62, an upper oil filling port, 63, an oil level, 64, an oil suction flange, 65, an oil suction filter element, 66, an oil suction filter element mounting port, 67, a fixing seat, 671, a groove, 672, a spring, 68, a mounting cover, 681, a top block, 7, an oil suction pump, 8, a communicating oil delivery pipe, 9, a central control module, 91, a VECU unit, 10 and a three-way joint).
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
Directional terms referred to in this invention are, for example: upper, lower, inner, outer, etc., are only with reference to the direction of figure 1 of the specification. Accordingly, the directional terminology is used for purposes of illustration only and is not intended to be limiting of the invention.
Example 1
As shown in fig. 1, the hydraulic oil tank of the excavator comprises an upper frame 1, an upper hydraulic control device 20 arranged on the upper frame 1, a central rotating structure 2 and a lower frame 3. The hydraulic oil tank of the excavator comprises a lower oil tank body 4 and an upper oil delivery pipe 5. The lower oil tank body 4 is mounted on the lower frame 3, and the lower oil tank body 4 comprises a lower oil port 41. One end of the upper oil delivery pipe 5 is connected with the lower oil port 41, and the other end is connected with the upper hydraulic control equipment 20 of the upper frame 1 through a central rotating structure to provide operation energy for the upper hydraulic control equipment 20. The oil tank body is arranged on the lower frame 3, so that the oil tank body is convenient for oiling operation, and the problem that the size of the oil tank body is limited due to the small space of the upper frame 1 is effectively solved; and the gravity center of the excavator body can be lowered, so that the excavator runs and operates more stably.
Example 2
As shown in fig. 2 to 3, according to embodiment 1, the hydraulic oil tank for the excavator of the present invention further comprises an upper oil tank body 6, an oil suction pump 7, a communicating oil pipe 8 and a central control module 9, which are provided on the upper frame. The upper tank body 6 includes an upper oil suction port 61 and an upper oil filler port 62. The oil suction pump 7 is electrically connected with the central control module 9, and the central control module 9 controls the operation; the central control module 9 has a VECU unit 91 built in. The oil suction pump 7 is an electronic oil suction pump and is arranged at an upper oil filling port 62 of the upper oil tank body 6; the upper end of the communicating oil delivery pipe 8 is connected with the oil suction pump 7, and the lower end is connected with the oil outlet 41. One end of the upper oil delivery pipe 5 is connected with the upper oil suction port 61, and the other end is connected with the upper hydraulic control equipment 20 of the upper frame 1. The upper frame 1 and the lower frame 3 are respectively provided with an oil tank body, which is equivalent to dividing one oil tank body in the existing excavator into two parts, so that the integral oil storage capacity of the excavator can be increased; the upper oil tank body 6 is filled with oil through the oil suction pump 7; the oil filling port is arranged on the lower frame 3, so that the oil filling is convenient, and the oil filling quantity of the upper oil tank body 6 is ensured to be sufficient.
The volume of the lower oil tank body 4 is smaller than that of the upper oil tank body 6, so that the excessive oil pumping of the upper oil tank body 6 from the lower oil tank body 4 through an oil sucking pump is avoided, and the upper oil tank body 6 overflows. The volume of the lower oil tank body 4 is optimally 80% of the volume of the upper oil tank body 6.
The oil level gauge 63 is arranged in the oil tank body 6, and the oil level gauge 63 is electrically connected with the central control module 9; the oil level gauge 63 is used to monitor the amount of oil in the upper tank body 6.
The upper oil suction port 61 is positioned below the upper oil tank body 6; the upper oil suction port 61 is provided with an oil suction flange 64, an oil suction filter element 65 is connected to the upper surface of the oil suction flange 64, and the oil suction filter element 65 is arranged in the upper oil tank body 6; an oil suction filter element mounting port 66 is arranged on the upper oil tank body 6; the upper part of the oil absorption filter element 65 is provided with a fixed seat 67, and the oil absorption filter element mounting opening 66 is provided with a mounting cover 68 matched with the fixed seat 67. The installation port of the filter element is arranged on the upper oil tank body 6, so that the problems of waste of hydraulic oil and troublesome operation during installation of the filter from the lower surface of the upper oil tank body 6 are effectively solved. And through fixing base 67 and installation lid cooperation 68, can be with oil absorption filter core 65, firmly install in oil absorption flange 64, ensure that it plays corresponding effect.
The fixing seat 67 is provided with a groove 671 with an upward opening, and the groove 671 is internally provided with a spring 672; a downward protruding top block 681 is arranged in the middle of the lower surface of the mounting cover 68, and the top block 681 is sleeved in the groove 671 to press the spring 672 downward, so that the oil suction filter element 65 is propped down against the oil suction flange 64. The spring 672 is arranged in the groove 671 of the fixing seat 67, and the action of the buoyancy force of the hydraulic oil in the box body on the filter element can be counteracted by utilizing the elasticity of the spring 672, so that the oil suction filter element 65 is tightly connected with the oil suction flange 64.
Example 3
As shown in fig. 4 to 5, according to embodiment 2, a hydraulic oil tank for an excavator of the present invention further comprises a three-way structure 10 mounted to the communicating oil pipe 8; the three-way joint 10 is electrically connected with the central control module 9, and is controlled by the central control module 9 to selectively refuel the upper oil tank body 6 or the lower oil tank body 4.
As shown in fig. 2-6, according to the method for controlling the oil amount of the hydraulic oil tank of the excavator in embodiment 2 and embodiment 2, the central control module 9 supplements the upper oil tank 6 in time through the oil level 63 and the oil suction pump 7, and the oil supplementing steps are as follows:
a. Setting a threshold value of the oil quantity in the upper oil tank body 6 through the central control module 9;
b. setting the maximum idle time T of the oil suction pump 7 through the central control module 9;
c. The oil level indicator 63 transmits the oil quantity condition in the upper oil tank body 6 to the central control module 9 in real time, when the oil quantity in the upper oil tank body 6 is lower than a threshold value, the oil suction pump 7 automatically starts the oil suction operation, otherwise, the oil level indicator 63 continuously monitors the oil quantity condition in the upper oil tank body 6;
d. In the time T, the oil sucking pump 7 sucks oil from the lower oil tank body 4 through the communicating oil conveying pipe 8, and the oil sucking pump 7 sucks oil until the oiling of the upper oil tank body 6 is completed; when the time T is exceeded, the oil suction pump 7 does not suck oil from the lower tank body 4 through the communication oil delivery pipe 8, and the operation of the oil suction pump 7 is stopped.
The oil quantity in the upper oil tank body 6 is controlled by the oil quantity control method, so that the oil quantity of the upper oil tank body 6 can be ensured to be sufficient, and the normal operation of the excavator can be met.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims.
Claims (4)
1. The utility model provides an excavator hydraulic tank, the excavator includes the frame, locates the last hydraulically controlled equipment, central revolution mechanic and the lower frame of going up the frame, its characterized in that: comprises a lower oil tank body and an upper oil delivery pipe; the lower oil tank body is arranged on the lower frame and comprises an oil outlet; one end of the upper oil delivery pipe is connected with the lower oil port, and the other end of the upper oil delivery pipe is connected with upper hydraulic control equipment of the upper frame through a central rotating structure to provide operation energy for the upper hydraulic control equipment, and the upper oil delivery pipe further comprises an upper oil tank body, an oil suction pump, a communicating oil delivery pipe and a central control module, wherein the upper oil tank body, the oil suction pump and the communicating oil delivery pipe are arranged on the upper frame; the upper oil tank body comprises an upper oil suction port and an upper oil filling port; the oil suction pump is electrically connected with the central control module and is controlled by the central control module to operate; the oil suction pump is an electronic oil suction pump and is arranged at an upper oil filling port of the upper oil tank body; the upper end of the communicating oil delivery pipe is connected with the oil suction pump, and the lower end of the communicating oil delivery pipe is connected with the oil outlet; one end of the upper oil delivery pipe is connected with an upper oil suction port, the other end of the upper oil delivery pipe is connected with upper hydraulic control equipment of the upper frame, and the upper oil suction port is positioned below the upper oil tank body; the upper oil suction port is provided with an oil suction flange, an oil suction filter element is connected to the upper surface of the oil suction flange, and the oil suction filter element is arranged in the upper oil tank body; an oil absorption filter element mounting port is arranged on the upper oil tank body; the upper part of the oil absorption filter element is provided with a fixed seat, the oil absorption filter element mounting opening is provided with a mounting cover matched with the fixed seat, the fixed seat is provided with a groove with an upward opening, and a spring is arranged in the groove; a downward protruding jacking block is arranged in the middle of the lower surface of the mounting cover, the jacking block is sleeved in the groove, the spring is pressed downwards, the oil suction filter element is further pressed against the upper surface of the oil suction flange downwards, and the oil suction device further comprises a tee joint structure which is mounted on a communicating oil delivery pipe; the three-way joint is electrically connected with the central control module and controlled by the central control module, and is used for selecting an upper oil tank body or a lower oil tank body for oiling, and the volume of the lower oil tank body is smaller than that of the upper oil tank body.
2. The excavator hydraulic tank of claim 1 wherein: the oil level gauge is arranged in the upper oil tank body and is electrically connected with the central control module; the oil level is used for monitoring the oil quantity in the upper oil tank.
3. The excavator hydraulic tank of claim 1 wherein: and the central control module is internally provided with a VECU unit.
4. The oil quantity control method of the hydraulic oil tank of the excavator according to claim 1 is characterized in that the central control module timely supplements oil for the upper oil tank body through an oil level and oil suction pump according to claim 2, and the oil supplementing step is as follows:
a. setting a threshold value of the oil quantity in the upper oil tank through the central control module;
b. setting the maximum idle time T of the oil suction pump through the central control module;
c. The oil level transmits the oil quantity condition in the upper oil tank body to the central control module in real time, when the oil quantity in the upper oil tank body is lower than a threshold value, the oil suction pump automatically starts oil suction operation, otherwise, the oil level continuously monitors the oil quantity condition in the upper oil tank body;
d. In the time T, the oil sucking pump pumps oil from the lower oil tank body through the communicating oil conveying pipe, so that the oil sucking pump sucks the oil until the oiling of the upper oil tank body is completed; when the time T is exceeded, the oil suction pump does not pump oil from the lower oil tank body through the communicated oil delivery pipe, and the oil suction pump stops working.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711190723.2A CN107939753B (en) | 2017-11-24 | 2017-11-24 | Hydraulic oil tank of excavator and oil quantity control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711190723.2A CN107939753B (en) | 2017-11-24 | 2017-11-24 | Hydraulic oil tank of excavator and oil quantity control method |
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| Publication Number | Publication Date |
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| CN107939753A CN107939753A (en) | 2018-04-20 |
| CN107939753B true CN107939753B (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711190723.2A Active CN107939753B (en) | 2017-11-24 | 2017-11-24 | Hydraulic oil tank of excavator and oil quantity control method |
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| Country | Link |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593589A (en) * | 2020-01-17 | 2021-04-02 | 中国电建集团西北勘测设计研究院有限公司 | Submersible dredging robot |
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| JPS634127A (en) * | 1986-06-20 | 1988-01-09 | Yutani Heavy Ind Ltd | Pressure oil circuit for pressure oil shovel |
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| CN204572587U (en) * | 2015-01-06 | 2015-08-19 | 西安昆仑工业（集团）有限责任公司 | Hydraulic system fuel tank |
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| CN205086674U (en) * | 2015-09-11 | 2016-03-16 | 广西柳工机械股份有限公司 | Engineering machinery fuel tank |
| CN205578379U (en) * | 2016-04-28 | 2016-09-14 | 徐州徐工挖掘机械有限公司 | Simple and convenient excavator hydraulic tank of breather valve processing |
| CN205677675U (en) * | 2016-06-22 | 2016-11-09 | 福建大唐国际宁德发电有限责任公司 | A kind of double float fuel tank sealing oil system |
| CN207485756U (en) * | 2017-11-24 | 2018-06-12 | 福建新源重工有限公司 | A kind of excavator hydraulic oil case |
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|---|---|---|---|---|
| JPS634127A (en) * | 1986-06-20 | 1988-01-09 | Yutani Heavy Ind Ltd | Pressure oil circuit for pressure oil shovel |
| US6134816A (en) * | 1996-06-28 | 2000-10-24 | Kabushiki Kaisha Kobe Seiko Sho | Hydraulic excavator with coupling pin access |
| CN102367816A (en) * | 2011-11-30 | 2012-03-07 | 徐州重型机械有限公司 | Oil tank and crane with same |
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| CN207485756U (en) * | 2017-11-24 | 2018-06-12 | 福建新源重工有限公司 | A kind of excavator hydraulic oil case |
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| Publication number | Publication date |
|---|---|
| CN107939753A (en) | 2018-04-20 |
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