KR20040082820A - 2 speed hydrauric device for operating boom faster - Google Patents
2 speed hydrauric device for operating boom faster Download PDFInfo
- Publication number
- KR20040082820A KR20040082820A KR1020030017506A KR20030017506A KR20040082820A KR 20040082820 A KR20040082820 A KR 20040082820A KR 1020030017506 A KR1020030017506 A KR 1020030017506A KR 20030017506 A KR20030017506 A KR 20030017506A KR 20040082820 A KR20040082820 A KR 20040082820A
- Authority
- KR
- South Korea
- Prior art keywords
- boom
- pump
- control valve
- hydraulic oil
- hydraulic
- Prior art date
Links
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 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
- E02F9/2004—Control mechanisms, e.g. control levers
-
- 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
-
- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
본 발명은 붐 고속 상승용 2단 유압장치에 관한 것으로, 그 목적은 붐 상승시에만 붐 실린더에 유량을 공급하여 휠로더의 작업 사이클 타임을 단축시키고, 이를 통해 다양한 작업수행을 효율적으로 수행함과 동시에, 작업능률을 향상시킬 수 있는 붐 고속 상승용 2단 유압장치를 제공하는 것이다.The present invention relates to a two-stage hydraulic device for high speed boom, the purpose of which is to supply the flow rate to the boom cylinder only when the boom is raised to shorten the work cycle time of the wheel loader, thereby performing various tasks efficiently, It is to provide a two-stage hydraulic system for boom high speed ascending efficiency.
본 발명은 펌프에서 토출되는 유압유가 메인 컨트롤 밸브를 통과하여 붐 실린더로 공급되어 붐이 상승되도록 구성된 유압장치에 있어서; 상기 펌프와 메인 컨트롤 밸브 사이에 설치된 유압유 이송배관에 토출관이 연결되고 유압탱크와 유입관이 연결되는 구동펌프와, 상기 구동펌프의 토출관에 설치되어 펌프에 의한 유압유의 유입을 방지하는 체크밸브와, 상기 구동펌프에 연결되어 작동시키는 전동모터와, 상기 전동모터에 연결되어 전원을 인가시키는 릴레이와, 상기 릴레이를 자동시키는 동작스위치를 포함하여 구성된 붐 고속 상승용 2단 유압장치를 제공함에 있다.The present invention relates to a hydraulic apparatus configured to supply hydraulic oil discharged from a pump through a main control valve to a boom cylinder so that the boom is raised; A discharge pump is connected to the hydraulic oil transfer pipe installed between the pump and the main control valve, and a driving pump connected to the hydraulic tank and the inlet pipe, and a check valve installed at the discharge pipe of the driving pump to prevent the inflow of hydraulic oil by the pump. And, an electric motor connected to the driving pump to operate, a relay connected to the electric motor to apply power, and an operation switch to automate the relay. .
Description
본 발명은 붐 고속 상승용 2단 유압장치에 관한 것으로, 붐 상승시에만 붐 실린더에 유량을 추가 공급하여 휠로더의 작업 사이클타임(붐 상승, 덤프, 붐 하강하는데 걸리는 시간)을 단축시킨 붐 고속 상승용 2단 유압장치에 관한 것이다.The present invention relates to a two-stage hydraulic system for high speed boom raising, and for supplying a flow rate to the boom cylinder only when the boom is raised, the boom high speed for shortening the work cycle time of the wheel loader (the time taken to raise, dump, and lower the boom). A two stage hydraulic system.
일반적으로 휠로더는 작업장치의 목저에 따라 다양한 기능을 수행할 수 있도록 제작된 건설장비로, 붐과 버켓을 이용하여 쌓여 있는 흙 또는 나무, 자갈 등을 덤프트럭에 싣기 위한 상차작업, 지게차에서 사용하는 포크를 이용한 지게차 대용작업, 원목을 나르기 위한 로그 포크작업 등 다양한 기능을 수행할 목적의 건설장비로서, 작업의 능률이 대단히 중요한 장비이다.In general, the wheel loader is a construction equipment manufactured to perform various functions according to the width of the working device. The wheel loader is used in a forklift truck for loading soil, wood, and gravel accumulated on a dump truck using a boom and a bucket. It is a construction equipment for the purpose of performing various functions such as forklift substitute work using a fork, log fork work to carry wood, and the efficiency of work is very important.
휠로더는 다양한 작업을 수행하는데 있어 작업 사이클타임 중, 붐 상승을 이용한 상차작업이 주를 이루고 있으므로, 작업효율을 높이기 위한 작업 사이클타임은 매우 중요한 요소가 아닐 수 없다. 이와 같은 다양한 휠로더의 구락 및 상차작업을 수행하는데 있어 중요한 요소는 압력과 유량 두 요소가 사용되는데 압력은 흙을 버켓에 담기 위한 굴삭하는 힘에 관련된 사항이므로, 작업 사이클타임과는 무관한 사항이다. 작업 사이클타임은 붐 상승, 덤프, 붐 하강으로 구성되어 있으며, 특히 붐 상승할 때 가장 긴 시간이 소요된다.The wheel loader is mainly used for loading work using the boom lift during the work cycle time, so the work cycle time for improving work efficiency is a very important factor. The important factors in performing the various wheel loaders' loading and loading operations are pressure and flow rate. The pressure is related to the excavating force for putting soil into the bucket, and thus is not related to the working cycle time. The work cycle time consists of boom up, dump and boom down, especially when the boom rises.
작업 사이클타임 중, 가장 오랜 시간이 걸리는 붐 상승과 관련이 있는 요소는 압력이 아닌 유압유의 유량과 밀접한 관계가 있으므로, 붐 상승을 증대시키기위한 속도를 제어하려면, Ｑ(유량)＝Ａ(단면적)＊Ｖ(유속)에 의거, 붐 실린더의 라지 챔버에 많은 유압유의 유량을 공급해야 한다.During the working cycle, the factor that is associated with the longest rise of the boom is closely related to the flow rate of the hydraulic oil and not the pressure. Therefore, to control the speed to increase the boom rise, Ｑ (flow rate) = A (cross-section) * According to the flow rate, a large amount of hydraulic oil must be supplied to the large chamber of the boom cylinder.
상기와 같은 붐 상승속도를 증대시키기 위하여 휠로더에 적용중인 방법은 별도의 장치를 구비하는 것이 아니라, 도 3 에 도시된 바와 같이, 유량의 증가를 위하여 엔진의 회전수를 증가시켜 펌프의 회전수를 증가시키므로써, 유압유의 토출량을 증가시키도록 되어 있으나, 상기 펌프의 용량은 작업 사이클 타임에 맞도록 결정한 것이므로, 실제 붐 상승속도를 증대하였다고 할 수 없는 문제점이 있었다.The method being applied to the wheel loader to increase the speed of the boom as described above is not provided with a separate device, as shown in Figure 3, by increasing the number of revolutions of the engine to increase the flow rate to increase the number of revolutions of the pump By increasing the discharge amount of the hydraulic oil, but the capacity of the pump is determined to meet the working cycle time, there is a problem that can not be said to increase the actual boom up speed.
즉, 펌프에서 토출되는 유압유의 용량은 펌프의 회전수에 의해 결정되므로 최대 회전수에서 최대용량이 나오지만 유량을 증가시키기 위해서는 펌프의 용량이 큰 것으로 바꾸거나, 별도로 추가해야 하는 문제점이 있었다.That is, since the capacity of the hydraulic oil discharged from the pump is determined by the rotational speed of the pump, the maximum capacity comes out at the maximum rotational speed, but in order to increase the flow rate, there is a problem in that the capacity of the pump is changed to a larger one or added separately.
또한, 붐 실린더에 연결되는 배관사이즈를 증대하여 유량을 증대시키는 방안도 있으나, 이를 변경하기 위해서는 기존 표준장비의 상당부분을 변경해야 하는 등 여러 가지 제약이 발생되었다.In addition, there is a way to increase the flow rate by increasing the pipe size connected to the boom cylinder, but in order to change this has caused a number of restrictions, such as the need to change a substantial portion of the existing standard equipment.
상기와 같은 문제점으로 인하여 현재 많이 사용되고 있는 방법으로는 트랜스미션에 유압유 공급용 펌프를 추가로 설치하고, 작업 사이클타임 중 붐 상승을 제외한 다른 작업시 추가 설치된 펌프에서 토출되는 유량을 유압탱크로 연결하기 위한 커트 오프 밸브를 설치하여, 굴삭 및 침투시 별도로 추가된 펌프의 유량은 커트 오프 밸브에서 유압탱크로 유량을 보내고, 붐 상승시 커트 오프 밸브에서 메인 컨트롤 밸브를 거쳐 붐 실린더의 라지 챔버로 유압유를 공급하는 시스템을 사용하고 있으나, 상기와 같은 종래의 기술수단은 작업 사이클 중, 붐 상승시에 많은 유량을공급하기 위하여 트랜스미션에 추가로 펌프를 설치함으로써 다른 작업에서도 추가로 설치된 펌프가 계속 구동되어 에너지를 낭비하게 되는 문제점이 있었다. 즉, 붐을 상승할 경우, 커트 오프 밸브에서 메인 컨트롤 밸브를 통하여 붐 실린더로 유압유를 공급하고 다른 작업을 할 경우, 커트 오프 밸브에서 유압탱크로 유압유를 보내므로, 필요시 사용을 위하여 항상 구동을 시켜야 하는 등 여러 가지 문제점이 있었다.Due to the above problems, currently used methods are to install a hydraulic oil supply pump to the transmission in addition, and to connect the flow rate discharged from the additionally installed pump during the other work except the boom rise during the work cycle time to the hydraulic tank By installing a cut-off valve, the flow rate of the pump added separately during excavation and infiltration transfers the flow from the cut-off valve to the hydraulic tank and supplies hydraulic oil to the large chamber of the boom cylinder from the cut-off valve through the main control valve when the boom is raised. However, the conventional technical means as described above, by installing an additional pump in the transmission to supply a large flow rate when the boom rises during the work cycle, the additional pump is continuously driven in other operations to waste energy There was a problem. In other words, when the boom is raised, the hydraulic oil is supplied from the cut-off valve to the boom cylinder through the main control valve, and when performing other work, the hydraulic oil is sent from the cut-off valve to the hydraulic tank. There were many problems, such as the need to.
본 발명은 상기와 같은 문제점을 고려하여 이루어진 것으로, 그 목적은 붐 상승시에만 붐 실린더에 유량을 공급하여 휠로더의 작업 사이클 타임을 단축시키고, 이를 통해 다양한 작업수행을 효율적으로 수행함과 동시에, 작업능률을 향상시킬 수 있는 붐 고속 상승용 2단 유압장치를 제공하는 것이다.The present invention has been made in consideration of the above problems, and its object is to supply the flow rate to the boom cylinder only when the boom is raised to shorten the work cycle time of the wheel loader, thereby performing various tasks efficiently and at the same time improving the work efficiency. It is to provide a two-stage hydraulic system for the boom high speed lift that can be improved.
본 발명은 펌프에서 토출되는 유압유가 메인 컨트롤 밸브를 통과하여 붐 실린더로 공급되어 붐이 상승되도록 구성된 유압장치에 있어서; 상기 펌프와 메인 컨트롤 밸브 사이에 설치된 유압유 이송배관에 토출관이 연결되고 유압탱크와 유입관이 연결되는 구동펌프와, 상기 구동펌프의 토출관에 설치되어 펌프에 의한 유압유의 유입을 방지하는 체크밸브와, 상기 구동펌프에 연결되어 작동시키는 전동모터와, 상기 전동모터에 연결되어 전원을 인가시키는 릴레이와, 상기 릴레이를 자동시키는 동작스위치를 포함하여 구성된 붐 고속 상승용 2단 유압장치를 제공함에 있다.The present invention relates to a hydraulic apparatus configured to supply hydraulic oil discharged from a pump through a main control valve to a boom cylinder so that the boom is raised; A discharge pump is connected to the hydraulic oil transfer pipe installed between the pump and the main control valve, and a driving pump connected to the hydraulic tank and the inlet pipe, and a check valve installed at the discharge pipe of the driving pump to prevent the inflow of hydraulic oil by the pump. And, an electric motor connected to the driving pump to operate, a relay connected to the electric motor to apply power, and an operation switch to automate the relay. .
도 1 은 본 발명의 구성을 보인 예시도1 is an exemplary view showing a configuration of the present invention
도 2 는 본 발명에 따른 동작스위치를 설치위치를 보인 예시도Figure 2 is an exemplary view showing the installation position of the operation switch according to the present invention
도 3 은 종래의 구성을 보인 예시도3 is an exemplary view showing a conventional configuration
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
(1) : 펌프 (2) : 메인 컨트롤 밸브(1): pump (2): main control valve
(3) : 붐 실린더 (4) : 유압탱크(3): Boom cylinder (4): Hydraulic tank
(5) : 전동모터 (6) : 구동펌프(5): Electric motor (6): Drive pump
(7) : 전원부 (8) : 동작스위치(7): Power supply part (8): Operation switch
(9) : 릴레이 (10) : 리모트 컨트롤 밸브9: relay 10: remote control valve
(11) : 유압유 이송배관 (61) : 구동펌프 토출관(11): hydraulic oil conveying pipe (61): drive pump discharge pipe
(62) : 구동펌프 유입관 (63) : 체크밸브(62): drive pump inlet pipe (63): check valve
도 1 은 본 발명의 구성을 보인 예시도를 도시한 것으로, 본 발명은 펌프(1)에서 토출되는 유압유가 메인 컨트롤 밸브(2)를 통과하여 붐 실린더(3)로 공급되어 붐이 상승되도록 구성된 종래의 유압장치에 있어서, 메인 컨트롤 밸브(2)와 유압탱크(4) 사이에 전기에 의해 구동되는 전동모터(5)와 구동펌프(6)를 설치하고, 상기 전동모터(5)를 전원부(7)와 연결된 동작스위치(8)에 의해 작동시키며, 상기 전동모터(5)와 동작스위치(8) 사이에 전원을 인가하는 릴레이(9)를 설치하도록 되어 있다.Figure 1 shows an exemplary view showing the configuration of the present invention, the present invention is configured such that the hydraulic oil discharged from the pump (1) is supplied to the boom cylinder (3) through the main control valve (2) to raise the boom In the conventional hydraulic device, an electric motor 5 and a driving pump 6 driven by electricity are installed between the main control valve 2 and the hydraulic tank 4, and the electric motor 5 is connected to a power supply unit ( It is operated by the operation switch 8 connected to 7), it is to install a relay (9) for applying power between the electric motor (5) and the operation switch (8).
상기 구동펌프(6)는 전기에 의해 구동되는 전동모터(5)에 의해 구동되는 것으로, 펌프(1)와 메인 컨트롤 밸브(2) 사이에 설치된 유압유 이송배관(11)에 토출관(61)이 연결되고 유압탱크(4)와 유입관(62)이 연결되도록 되어 있다.The drive pump 6 is driven by an electric motor 5 driven by electricity, and the discharge pipe 61 is provided in the hydraulic oil transfer pipe 11 provided between the pump 1 and the main control valve 2. It is connected and the hydraulic tank 4 and the inlet pipe 62 is to be connected.
또한, 상기 구동펌프의 토출관(61)에는 펌프(1)에서 토출되는 유압유가 구동펌프(6)로 유입되는 것을 방지하기 위한 체크밸브(63)가 설치되어 있다.In addition, the discharge pipe 61 of the drive pump is provided with a check valve 63 for preventing hydraulic oil discharged from the pump 1 from flowing into the drive pump 6.
상기 동작스위치(8)는 리모트 컨트롤 밸브(10)의 조작에 의해 작동되는 것으로, 도 2 에 도시된 바와 같이, 리모트 컨트롤 밸브(10)의 손잡이 부분에 설치하거나, 붐 상승을 위한 리모트 컨트롤 밸브(10)의 손잡이 부분이 일정각(α)을 이룰 때 작동되도록 리모트 컨트롤 밸브 손잡이의 작동범위내에 위치하도록 설치한다.The operation switch 8 is operated by the operation of the remote control valve 10, as shown in Figure 2, installed on the handle portion of the remote control valve 10, or a remote control valve for raising the boom ( 10) Install the knob in the operating range of the remote control valve knob so that it is operated when the handle part reaches a certain angle (α).
상기 릴레이(9)는 동작스위치(8)의 사용으로 인한 전기라인의 보호를 위하여 설치되는 것으로, 전동모터(5)로 전원을 인가하며, 전동모터(5)와 동작스위치(8) 사이에 위치하도록 설치된다.The relay 9 is installed for protection of the electric line due to the use of the operation switch 8, and applies power to the electric motor 5, and is located between the electric motor 5 and the operation switch 8. To be installed.
상기와 같이 구성된 본 발명은 붐을 상승시키고자 할 경우, 조작자가 리모트 컨트롤 밸브의 손잡이에 설치된 동작스위치를 작동시키거나, 붐을 상승시키기 위해 리모트 컨트롤 밸브의 손잡이가 일정각을 이루어 동작스위치를 작동시키면, 릴레이가 전원을 연결하게 되고, 이로 인해 전동모터와 구동펌프가 작동하여, 유압탱크내의 유압유를 메인 컨트롤 밸브를 통해 붐을 상승시키는 붐 실린더로 추가 공급하게 된다.According to the present invention configured as described above, when the operator wants to raise the boom, the operator operates the operation switch installed on the handle of the remote control valve, or the handle of the remote control valve is operated at a predetermined angle to raise the boom. Then, the relay is connected to the power supply, which causes the electric motor and the driving pump to operate, thereby supplying the hydraulic oil in the hydraulic tank to the boom cylinder for raising the boom through the main control valve.
즉, 본 발명은 펌프에 의해 붐 실린더로 유압유가 공급되고, 동작스위치에 의해서만 작동되는 전동모터와 구동펌프에 의해 붐 실린더로 유압유가 추가 공급되도록 되어 있어, 증가된 유량에 의해 붐 상승의 요인이 되어 고속으로 붐을 상승시키도록 되어 있다.That is, in the present invention, the hydraulic oil is supplied to the boom cylinder by the pump, and the hydraulic oil is additionally supplied to the boom cylinder by the electric motor and the driving pump operated only by the operation switch. This raises the boom at high speed.
본 발명은 상술한 특정의 바람직한 실시예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형실시가 가능한 것은 물론이고, 그와 같은 변경은 청구범위 기재의 범위내에 있게 된다.The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.
이와 같이 본 발명은 붐 상승시에만 붐 실린더내로 유압유를 추가 공급하도록 되어 있어, 작업 사이클 타임을 단축하고, 불필요한 에너지 소비를 미연에 방지할 수 있다.As described above, the present invention is configured to additionally supply hydraulic oil into the boom cylinder only when the boom is raised, thereby reducing the work cycle time and preventing unnecessary energy consumption.
또한 리모트 컨트롤 밸브 또는 그 작동반경내에 위치하도록 동작스위치를 설치하여, 간단한 조작에 의해 전동모터와 구동펌프를 작동할 수 있으며, 이로 인해 작업을 효율성을 증대시킬 수 있다.In addition, by installing the operation switch to be located within the remote control valve or its operating radius, it is possible to operate the electric motor and the driving pump by a simple operation, thereby increasing the work efficiency.
또한, 작업 사이클 타임의 단축으로 인하여 다양한 작업수행을 효율적으로 수행할 수 있는 등 많은 효과가 있다.In addition, due to the shortening of the work cycle time, there are many effects, such as being able to efficiently perform various work executions.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030017506A KR100717922B1 (en) | 2003-03-20 | 2003-03-20 | Two stage hydraulic system for boom high speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030017506A KR100717922B1 (en) | 2003-03-20 | 2003-03-20 | Two stage hydraulic system for boom high speed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20040082820A true KR20040082820A (en) | 2004-09-30 |
| KR100717922B1 KR100717922B1 (en) | 2007-05-11 |
Family
ID=37366559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020030017506A KR100717922B1 (en) | 2003-03-20 | 2003-03-20 | Two stage hydraulic system for boom high speed |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100717922B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104005439A (en) * | 2014-06-06 | 2014-08-27 | 山东中川液压有限公司 | Oil-hydraulic hybrid power system of efficient energy-saving environment-friendly hydraulic excavator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101098707B1 (en) | 2005-09-14 | 2011-12-26 | 현대중공업 주식회사 | Hydraulic apparatus for fastening elastic stud |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0791842B2 (en) * | 1988-01-18 | 1995-10-09 | 株式会社小松製作所 | Bucket leveler equipment |
| JP2583127B2 (en) * | 1989-06-30 | 1997-02-19 | 株式会社小松製作所 | Hydraulic excavator traveling / work equipment operating device |
| KR940000247B1 (en) * | 1990-10-31 | 1994-01-12 | 삼성중공업 주식회사 | Relative Speed Control Method of Excavator Swing Motor and Boolean Cylinder |
-
2003
- 2003-03-20 KR KR1020030017506A patent/KR100717922B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104005439A (en) * | 2014-06-06 | 2014-08-27 | 山东中川液压有限公司 | Oil-hydraulic hybrid power system of efficient energy-saving environment-friendly hydraulic excavator |
| CN104005439B (en) * | 2014-06-06 | 2016-10-05 | 山东中川液压有限公司 | A kind of hydraulic crawler excavator oil-liquid hybrid electric system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100717922B1 (en) | 2007-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101032731B1 (en) | Hydraulic system for excavators with hammer device | |
| JP2008157407A (en) | Hydraulic drive mechanism | |
| EP2508464A2 (en) | Energy recovery system for an electromotive forklift truck | |
| KR100717922B1 (en) | Two stage hydraulic system for boom high speed | |
| JP5028729B2 (en) | Control method of boom cylinder circuit of hydraulic excavator | |
| CN201193334Y (en) | Three-pump confluence control device for dredger | |
| KR100838813B1 (en) | Discharge oil recovery method of hydraulic motor and its device | |
| CN102409710B (en) | Pollutant discharging and dredging device for excavator | |
| CN202248003U (en) | Blowdown dredging device for excavator | |
| KR100621976B1 (en) | Heavy construction equipment with positive control boom down function | |
| KR20210136084A (en) | hydraulic machine | |
| KR101186568B1 (en) | hydraulic system having creation function for working mode | |
| CN112855675B (en) | Intelligent control system with integrated radiator temperature control for rotary drilling rig | |
| CN212297097U (en) | Electric steering control valve | |
| JP2003213723A (en) | Construction machinery | |
| KR0131980Y1 (en) | Two step relief hydraulic circuit apparatus for a heavy machine | |
| KR100998606B1 (en) | Discharge Flow Control System of Hydraulic Pump for Construction Equipment | |
| KR100663696B1 (en) | Hydraulic Circuit System of Excavator for Rock Drill | |
| KR100556022B1 (en) | Hydraulic system of excavator working equipment | |
| KR19990054725A (en) | Hydraulic system for construction machinery and its control method | |
| CN210033988U (en) | Fuel oil over-consumption prevention system for bulldozer | |
| KR100762078B1 (en) | Flow control device of excavator hydraulic pump | |
| CN209892237U (en) | Full hydraulic drive's chain pushing type concrete sprayer drive mechanism | |
| JPH022774Y2 (en) | ||
| KR920005489B1 (en) | Boom Drive Hydraulics of Construction Equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PA0109 | Patent application |
Patent event code: PA01091R01D Comment text: Patent Application Patent event date: 20030320 |
|
| PG1501 | Laying open of application | ||
| A201 | Request for examination | ||
| PA0201 | Request for examination |
Patent event code: PA02012R01D Patent event date: 20060314 Comment text: Request for Examination of Application Patent event code: PA02011R01I Patent event date: 20030320 Comment text: Patent Application |
|
| E902 | Notification of reason for refusal | ||
| PE0902 | Notice of grounds for rejection |
Comment text: Notification of reason for refusal Patent event date: 20061201 Patent event code: PE09021S01D |
|
| E701 | Decision to grant or registration of patent right | ||
| PE0701 | Decision of registration |
Patent event code: PE07011S01D Comment text: Decision to Grant Registration Patent event date: 20070410 |
|
| GRNT | Written decision to grant | ||
| PR0701 | Registration of establishment |
Comment text: Registration of Establishment Patent event date: 20070507 Patent event code: PR07011E01D |
|
| PR1002 | Payment of registration fee |
Payment date: 20070507 End annual number: 3 Start annual number: 1 |
|
| PG1601 | Publication of registration | ||
| LAPS | Lapse due to unpaid annual fee | ||
| PC1903 | Unpaid annual fee |