KR101251108B1 - Hydraulic control system for combined operation of en excavator - Google Patents

Hydraulic control system for combined operation of en excavator Download PDF

Info

Publication number
KR101251108B1
KR101251108B1 KR1020050132827A KR20050132827A KR101251108B1 KR 101251108 B1 KR101251108 B1 KR 101251108B1 KR 1020050132827 A KR1020050132827 A KR 1020050132827A KR 20050132827 A KR20050132827 A KR 20050132827A KR 101251108 B1 KR101251108 B1 KR 101251108B1
Authority
KR
South Korea
Prior art keywords
hydraulic
control spool
hydraulic pump
confluence
line
Prior art date
Application number
KR1020050132827A
Other languages
Korean (ko)
Other versions
KR20070070350A (en
Inventor
김윤기
Original Assignee
두산인프라코어 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 두산인프라코어 주식회사 filed Critical 두산인프라코어 주식회사
Priority to KR1020050132827A priority Critical patent/KR101251108B1/en
Publication of KR20070070350A publication Critical patent/KR20070070350A/en
Application granted granted Critical
Publication of KR101251108B1 publication Critical patent/KR101251108B1/en

Links

Images

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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

본 발명은 소형굴삭기의 주행복합동작 제어용 유압시스템에 관한 것으로, 적어도 3개의 유압펌프(P1,P2,P3)를 구비하고, 주행복합동작시 합류밸브(20)는 제2합류위치(20B)로 절환하여 붐제어스풀(12), 버켓제어스풀(13)과 암제어스풀(15)에, 제1유압펌프(P1) 및 제2유압펌프(P2)의 유량과는 별도의 제3유압펌프(P3)의 유량을 합류시켜 제공함으로써 주행복합동작시 프론트작업성능이 향상된다. The present invention relates to a hydraulic system for controlling a traveling compound operation of a small excavator, and includes at least three hydraulic pumps (P1, P2, and P3), and in the combined travel operation, the joining valve (20) moves to the second joining position (20B). By switching to the boom control spool 12, the bucket control spool 13 and the arm control spool 15, a third hydraulic pump (separate from the flow rate of the first hydraulic pump P1 and the second hydraulic pump P2) By providing the flow rate of P3), the front work performance is improved during the combined driving operation.

소형굴삭기, 3펌프, 합류밸브, 주행복합동작 Compact Excavator, 3 Pumps, Combined Valve, Travel Combined Operation

Description

굴삭기의 복합동작 제어용 유압제어시스템{ Hydraulic control system for combined operation of en excavator}Hydraulic control system for combined operation of excavator

도 1은 종래 굴삭기의 복합동작 제어용 유압제어시스템의 일 예를 도시한 유압회로도, 1 is a hydraulic circuit diagram showing an example of a conventional hydraulic control system for controlling the combined motion of an excavator;

도 2는 본 발명에 따른 굴삭기의 복합동작 제어용 유압제어시스템의 일 예를 도시한 유압회로도,2 is a hydraulic circuit diagram showing an example of the hydraulic control system for controlling the combined motion of the excavator according to the present invention;

도 3은 도 2의 합류밸브를 확대도시한 도면이다. 3 is an enlarged view of the confluence valve of FIG. 2.

※ 도면의 주요부분에 대한 부호의 설명[Description of Drawings]

P1: 제1유압펌프 P2: 제2유압펌프P1: 1st hydraulic pump P2: 2nd hydraulic pump

P3: 제3유압펌프 10: 컨트롤밸브P3: 3rd hydraulic pump 10: control valve

11: 우주행제어스풀 12: 붐제어스풀11: Space Flight Spool 12: Boom Control Spool

13: 버켓제어스풀 14: 좌주행제어스풀13: Bucket control spool 14: Left driving control spool

15: 암제어스풀 16: 선회제어스풀15: Arm Control Spool 16: Swivel Control Spool

17: 도저제어스풀 18: 프론트작업 제어스풀군17: Dozer control spool 18: Front job control spool

L1: 제1바이패스라인 L2: 제2바이패스라인L1: first bypass line L2: second bypass line

L3: 제3바이패스라인 20: 합류밸브L3: 3rd bypass line 20: confluence valve

20A: 제1합류위치 20B: 제2합류위치20A: first joining position 20B: second joining position

20C: 제3합류위치 21A: 제1수압부20C: 3rd joining position 21A: 1st hydraulic part

21B: 제2수압부 22: 스프링21B: second hydraulic part 22: spring

23A: 제1유로 23B: 제2유로23A: Euro 1B 23B: Euro 2

24A: 제3유로 24B: 제4유로(24B)24A: Euro 3B 24B: Euro 4 (24B)

25A: 제5유로 25B: 제6유로25A: Euro 5B 25B: Euro 6

30: 제1합류라인 31: 제2합류라인30: first joining line 31: second joining line

Pic: 주행복합동작신호 Pup: 붐상승신호Pic: Hybrid driving signal Pup: Boom up signal

본 발명의 굴삭기의 유압제어시스템에 관한 것으로, 특히 적어도 3개 이상의 유압펌프를 구비하여, 붐, 암, 버켓을 사용하여 이루어지는 소위 프론트작업과 주행모터를 구동하여 이루어지는 주행은 2개 이상의 유압펌프의 유량을 합류시킨 압유를 분배하여 사용하고, 프론트작업 이외에 또는 이들 프론트작업과 함께 이루어지는 다른 작업은 상기 2개의 유압펌프와는 별개의 유압펌프를 사용하는 3펌프시스템에서 복합동작을 제어하는 유압시스템에 관한 것이다. The hydraulic control system of the excavator of the present invention, in particular, is provided with at least three or more hydraulic pumps, the so-called front work made using the boom, the arm, the bucket, and the traveling by driving the driving motor is the two or more hydraulic pumps In addition to or in conjunction with the front work, other work carried out in addition to or in conjunction with the front work is carried out to the hydraulic system that controls the combined operation in a three pump system using a hydraulic pump separate from the two hydraulic pumps. It is about.

통상 소형굴삭기는 작업특성상 복수의 유압 액츄에이터를 구비하고 이들 액츄에이터를 단독 또는 2개 이상의 액츄에이터를 동시에 작동시켜 복합동작을 수행 한다. 이 경우 복합동작을 수행하는 복수개의 액츄에이터에 2개의 유압펌프로부터 토출되는 압유를 합류시켜 공급함으로써 복합동작을 원활히 수행하게 된다. In general, a compact excavator has a plurality of hydraulic actuators due to its working characteristics, and performs a combined operation by operating these actuators alone or two or more actuators simultaneously. In this case, the combined operation is smoothly performed by combining and supplying the pressure oil discharged from the two hydraulic pumps to the plurality of actuators performing the combined operation.

상기한 바와 같은 종래의 소형굴삭기의 유압시스템을 도 1을 참조하여 설명하면, 종래의 소형굴삭기의 복합동작 제어용 유압시스템은 상대적으로 용량이 큰 2개의 유압펌프, 즉 제1유압펌프(P1), 제2유압펌프(P2)와, 상기 2개의 유압펌프(P1,P2)보다 상대적으로 용량이 적은 제3유압펌프(P3)를 구비하고, 이들 3개의 유압펌프(P1,P2,P3))에서 토출되는 압유의 방향과 유량을 제어하여 복수개의 유압 액츄에이터로 공급하는 컨트롤밸브 유니트(100)를 구비한다. Referring to FIG. 1, a hydraulic system of a conventional compact excavator, as described above, includes two hydraulic pumps having a relatively large capacity, that is, a first hydraulic pump P1. A second hydraulic pump P2 and a third hydraulic pump P3 having a relatively smaller capacity than the two hydraulic pumps P1 and P2, and the three hydraulic pumps P1, P2 and P3) It is provided with a control valve unit 100 for controlling the direction and flow rate of the discharged pressure oil to be supplied to the plurality of hydraulic actuators.

그리고 상기 컨트롤밸브 유니트(100)는, 좌주행 유압모터로 공급되는 압유의 흐름을 제어하는 좌주행 제어스풀(101), 우주행 유압모터(도시생략)로 공급되는 압유을 제어하는 우주행 제어스풀(102), 붐실린더로 공급되는 압유의 흐름을 제어하는 붐제어스풀(103), 버켓실린더로 공급되는 압유의 흐름을 제어하는 버켓제어스풀(104), 암실린더로 공급되는 압유의 흐름을 제어하는 암제어스풀(105), 도저실린더로 공급하는 되는 압유의 흐름을 제어하는 도저제어스풀(106), 선회모터로 공급되는 압유의 흐름을 제어하는 선회 제어스풀(107)을 구비한다. In addition, the control valve unit 100, the left traveling control spool 101 for controlling the flow of the pressure oil supplied to the left traveling hydraulic motor, the space travel control spool for controlling the pressure oil supplied to the space traveling hydraulic motor (not shown) (102), boom control spool 103 for controlling the flow of the pressure oil supplied to the boom cylinder, bucket control spool 104 for controlling the flow of the pressure oil supplied to the bucket cylinder, control the flow of the pressure oil supplied to the dark cylinder An arm control spool 105, a doser control spool 106 for controlling the flow of the pressurized oil supplied to the dozer cylinder, and a turning control spool 107 for controlling the flow of the pressurized oil supplied to the swing motor.

상기 좌주행 제어스풀(101)과 우주행 제어스풀(102)은 주행직진 제어스풀(120)을 통하여 제1유압펌프(P1)과 제2유압펌프(P1)에 각각 연결되어 있다. 주행직진 제어스풀(120)는 주행복합신호를 받으면 제1유압펌프(P1)와 제2유압펌프(P2)의 압유를 합류시켜 좌/우 주행제어스풀(101,102)로 균등하게 유량을 분배되거나 단독 주행시에는 각 유압펌프의 압유를 각각 좌주행 제어스풀이나 우주행 제어스풀에 독립적으로 제공하게 되어 있다.The left traveling control spool 101 and the space traveling control spool 102 are connected to the first hydraulic pump P1 and the second hydraulic pump P1 through the traveling straight control spool 120, respectively. The driving straight control spool 120 merges the pressure oils of the first hydraulic pump P1 and the second hydraulic pump P2 when the driving compound signal is received, and evenly distributes the flow rate to the left / right driving control spools 101 and 102. When driving, the hydraulic pressure of each hydraulic pump is independently provided to the left driving control spool or the space traveling control spool.

그리고 선회제어스풀(107), 도저 제어스풀(106), 붐 제어스풀(103) 및 버켓제어스풀(104)은 제3유압펌프(P3)의 바이패스라인(L)에 차례로 배치되어 각 병렬라인을 통하여 압유를 제공받는다. The turning control spool 107, the doser control spool 106, the boom control spool 103, and the bucket control spool 104 are arranged in turn on the bypass line L of the third hydraulic pump P3, and each parallel line is arranged. Received oil through.

한편, 상기 컨트롤밸브 유니트(100)는, 상기 도저 제어스풀(106)과 붐제어스풀(103) 사이의 바이패스라인(L)에 설치된 합류밸브(110)을 더 구비한다. 이 합류밸브(110)은 주행복합동작 신호(주행과 프론트작업을 동시에 수행하는 경우)가 작용하지 않는, 주행단독 또는 프론트단독작업의 경우에는 상기 제3유압펌프(P3)에서 붐,암, 버켓과 같은 프론트작업장치쪽으로는 압유를 공급하지 않도록 차단하지만, 주행복합동작 신호가 작용하는 경우에는 제3유압펌프(P3)의 압유를 프론트작업장치쪽으로 제공하도록 되어 있다. Meanwhile, the control valve unit 100 further includes a confluence valve 110 installed in the bypass line L between the doser control spool 106 and the boom control spool 103. The confluence valve 110 is a boom, arm, bucket in the third hydraulic pump (P3) in the case of driving alone or front solenoid operation, the driving compound operation signal (in the case of performing the driving and front operation at the same time) does not act In order to prevent the hydraulic oil from being supplied to the front work device such as the above, when the traveling compound operation signal is applied, the hydraulic oil of the third hydraulic pump P3 is provided to the front work device.

또한 컨트롤밸브 유니트(100)는 주행직진밸브(120)을 구비하여, 주행복합동작의 경우에 제1유압펌프(P1)의 압유와 제2유압펌프(P2)의 압유를 합류시켜 합류된 유량을 좌주행 제어스풀(101)과 우주행 제어스풀(102)에 균등하게 분배함으로써 주행직진성을 확보하도록 되어 있다.In addition, the control valve unit 100 is provided with a traveling straight valve 120, in the case of the combined travel operation to combine the pressure oil of the first hydraulic pump (P1) and the pressure oil of the second hydraulic pump (P2) to merge the flow rate. The driving straightness is secured by equally distributing to the left traveling control spool 101 and the space traveling control spool 102.

그런데 상기 도 1에 도시된 종래 유압제어시스템은 다음과 같은 단점이 있다. However, the conventional hydraulic control system shown in FIG. 1 has the following disadvantages.

즉, 상기 합류밸브(110)은 주행복합동작의 경우에만 제3유압펌프(P3)의 압유 를 붐, 버켓, 암의 프론트작업장치쪽으로 제공하고, 도저나 선회동작없이 프론트 단독작업(붐 단독동작, 암 단독동작)이나 도저 또는 선회동작없이 프론트복합작업(예를 들면, 붐-암복합동작)만을 하는 경우에는 제3유압펌프(P3)의 유량은 합류밸브(110)에서 탱크(T)로 언로딩되므로 불필요한 에너지의 낭비가 발생하는 단점이 있었다. That is, the confluence valve 110 provides the pressure oil of the third hydraulic pump P3 to the front work device of the boom, the bucket, and the arm only in the case of the traveling combined operation, and the front single work without the dozer or the turning operation (only the boom is operated). In the case of a front composite operation (for example, a boom-arm combined operation) without a single arm operation or a doser or swing operation, the flow rate of the third hydraulic pump P3 is changed from the confluence valve 110 to the tank T. Unloading has the disadvantage of causing unnecessary waste of energy.

본 발명은 상기 종래 소형굴삭기의 유압제어시스템이 가진 단점을 해소하기 위하여, 통상적인 프론트 단독 또는 복합작업의 경우에도 유압펌프의 언로딩에 따르는 에너지 낭비를 없애고, 주행복합동작의 경우에는 주행직진성을 확보함과 동시에 다른 프론트작업장치에 따른 프론트작업의 성능을 우수하게 유지할 수 있는 굴삭기의 복합작업 제어용 유압시스템을 제공함에 목적이 있다. The present invention eliminates the energy waste caused by the unloading of the hydraulic pump even in the case of normal front alone or combined operation, in order to solve the disadvantages of the conventional hydraulic control system of the compact excavator, the driving straightness It is an object of the present invention to provide a hydraulic system for controlling a complex operation of an excavator that can secure excellent performance of front work according to other front work devices.

상기 목적을 달성하기 위한 본 발명의 복합동작 제어용 유압제어시스템은, 적어도 3개의 유압펌프와, Hydraulic control system for combined operation control of the present invention for achieving the above object, at least three hydraulic pumps,

상기 제1유압펌프에 차례로 연결된 우주행 제어스풀과, 붐 제어스풀 및 버켓 제어스풀로 이루어진 프론트작업 제어스풀군과, 상기 제2유압펌프에 차례로 연결된 좌주행 제어스풀 및 암제어스풀과, 상기 제3유압펌프에 차례로 연결된 선회제어스풀 및 도저제어스풀을 구비한 컨트롤밸브와,A space travel control spool connected to the first hydraulic pump in turn, a front work control spool group consisting of a boom control spool and a bucket control spool, a left driving control spool and an arm control spool connected to the second hydraulic pump in turn, and the first A control valve having a swing control spool and a doser control spool connected to the hydraulic pump in turn;

상기 도저 제어스풀을 바이패스한 제3유압펌프의 압유를 제1합류라인과 제2합류라인을 통해 상기 프론트작업 제어스풀군과, 암제어스풀에 각각 합류시키는 합 류밸브를 포함한 굴삭기의 복합동작 제어용 유압제어시스템에 있어서, Combined operation of the excavator including a confluence valve for joining the front work control spool group and the arm control spool through the first confluence line and the second confluence line of the hydraulic oil of the third hydraulic pump bypassing the doser control spool. In the control hydraulic control system,

상기 합류밸브는,The confluence valve,

일측에는 주행복합동작신호와 붐상승신호가 작용하는 제1,2수압부가 구비되고, 타측에는 스프링이 설치되며,One side is provided with a first and second hydraulic pressure unit for the combined driving signal and the boom up signal, the other side is provided with a spring,

상기 수압에 주행복합동작신호와 붐상승신호가 신호가 작용하지 않은 경우에 스프링에 의해 절환되어 상기 제3유압펌프의 바이패스라인을 제1합류라인과 연결하는 제1유로와 상기 제1유로에서 분기되어 상기 바이패스라인을 상기 제2합류라인에 연결하는 제2유로를 구비하여 상기 제3유압펌프의 압유를 상기 제1유압펌프 및 상기 제2유압펌프의 압유에 합류시키는 제1합류위치와,In the first passage and the first passage connecting the bypass line of the third hydraulic pump to the first confluence line by switching by a spring when the driving combined operation signal and the boom up signal do not act on the hydraulic pressure. A first confluence position branched to have a second flow path connecting the bypass line to the second confluence line to join the pressure oil of the third hydraulic pump to the pressure oil of the first hydraulic pump and the second hydraulic pump; ,

상기 제1수압부에만 주행복합동작신호가 작용하는 경우에 절환되어 상기 제3유압펌프의 바이패스라인을 제1합류라인에 연결하는 제3유로와, 상기 제3유로에서 분기되어 상기 바이패스라인을 상기 제2합류라인에 연결하고 상기 제3유로보다 상대적으로 더 작은 유량을 통과시키도록 오리피스가 설치된 제4유로를 구비하여 상기 프론트작업 제어스풀군에 상기 제3유암펌프의 압유를 제공하는 제2합류위치와,  A third flow path which is switched when the driving combined operation signal acts only on the first hydraulic pressure part and connects the bypass line of the third hydraulic pump to the first confluence line, and branched from the third flow path to the bypass line; To provide a pressure oil of the third oil pump to the front work control spool group having a fourth flow path having an orifice installed therein to connect to the second confluence line and pass a flow rate relatively smaller than the third flow path. 2 joining position,

상기 제1수압부와 상기 제2수압부에 각각 주행복합동작신호와 붐상승신호가 작용하는 경우에 절환되어 상기 제3유압펌프의 바이패스라인을 제1합류라인에 연결하는 제5유로와, 상기 제5유로에서 분기되어 상기 바이패스라인을 상기 제2합류라인에 연결하고 상기 제5유로보다 상대적으로 더 작은 유량을 통과시키도록 오리피스가 설치된 제6유로를 구비하여 상기 제3유압펌프의 유량을 상기 암 제어스풀보다 상기 프론트작업 제어스풀군으로 증대시키는 제3합류위치를 구비한다.  A fifth flow path which is switched when the driving combined operation signal and the boom up signal respectively act on the first hydraulic part and the second hydraulic part, and connects the bypass line of the third hydraulic pump to the first confluence line; A flow rate of the third hydraulic pump having a sixth flow passage branched from the fifth flow passage to connect the bypass line to the second confluence line and having a flow rate relatively smaller than the fifth flow passage; And a third joining position for increasing the arm control spool to the front work control spool group.

상기한 바와 같이 본 발명에 따른 굴삭기의 복합동작 제어용 유압시스템은 프론트작업만을 하는 경우나 하나 이상의 프론트작업장치를 작동시켜 프론트복합동작(예컨대, 붐-암 복합동작)을 하는 경우에, 암, 붐, 버켓과 같은 프론트작업장치에는 제1유압펌프와 제2유압펌프의 압유가 제공되고, 동시에 합류밸브는 제3유압펌프의 압유를 상기 제1유압펌프 및 제2유압펌프의 압유에 합류시켜 프론트작업장치에 공급되는 유량을 증가시킴으로써 프론트작업장치의 성능을 향상시킨다. As described above, the hydraulic system for controlling the combined motion of an excavator according to the present invention is used only for front work or when operating one or more front work devices to perform a front compounding operation (for example, a boom-arm compound operation). , The front work device such as a bucket is provided with the pressure oil of the first hydraulic pump and the second hydraulic pump, and at the same time, the joining valve merges the pressure oil of the third hydraulic pump to the pressure oil of the first hydraulic pump and the second hydraulic pump. Increasing the flow rate to the work tool improves the performance of the front work tool.

또한, 주행과 프론트작업을 동시에 수행하는 경우에는, 합류밸브의 수압부에 주행복합신호가 작용하여 합류밸브가 주행복합의 제2합류위치로 절환하게 되고, 이 상태에서 우주행장치와 좌주행장치에는 각각 제1유압펌프와 제2유압펌프에서 제공되고, 프론트작업장치쪽으로는 제1유압펌프 및 제2유압펌프의 압유와 함께 합류밸브를 거친 제3유압펌프의 압유가 제공되어 공급유량이 증가함으로써 프론트작업을 원활하게 수행하게 된다. In addition, when the driving and the front work are performed simultaneously, the driving compound signal acts on the hydraulic pressure portion of the joining valve so that the joining valve switches to the second joining position of the traveling compound, and in this state, the space travel device and the left traveling device The first hydraulic pump and the second hydraulic pump are respectively provided, and the hydraulic pressure of the third hydraulic pump through the joining valve is provided to the front work device together with the hydraulic pressure of the first hydraulic pump and the second hydraulic pump. By doing so, the front work is performed smoothly.

한편, 붐상승의 경우 또는 붐동작과 다른 프론트작업장치가 동시에 수행하는 붐복합동작의 경우에는 합류밸브는 수압부에 붐상승신호가 작용함으로써 암제어스풀쪽으로 합류되는 제3유압펌프의 유량을 상대적으로 줄여서 붐제어스풀과 버켓제어스풀쪽으로 합류되는 제3유압펌프의 유량을 증대시킴으로써 붐상승 동작 또는 붐복합동작의 성능을 향상시키게 된다. On the other hand, in the case of the boom rise or in the case of the boom combined operation performed by the boom operation and another front work device at the same time, the joining valve is a flow rate of the third hydraulic pump joined to the arm control spool by the boom rise signal acting on the hydraulic pressure section. By increasing the flow rate of the third hydraulic pump joined to the boom control spool and the bucket control spool, the performance of the boom raising operation or the boom compound operation is improved.

이하, 본 발명에 따른 굴삭기의 복합작업 제어용 유압제어시스템의 실시예를 도면에 따라 상세히 설명한다. Hereinafter, an embodiment of a hydraulic control system for controlling a complex operation of an excavator according to the present invention will be described in detail with reference to the drawings.

도 2는 본 발명에 따른 굴삭기의 복합동작제어용 유압제어시스템을 개략적으 로 도시한 유압회로도이고, 도 3은 도 2의 합류밸브를 확대도시한 도면이다.Figure 2 is a hydraulic circuit diagram schematically showing a hydraulic control system for controlling the combined motion of the excavator according to the present invention, Figure 3 is an enlarged view showing the confluence valve of FIG.

도 2에 도시된 바와 같이, 본 발명에 따른 소형굴삭기의 유압시스템은 적어도 3개의 유압펌프, 즉 제1유압펌프(P1), 제2유압펌프(P2) 및 제3유압펌프(P3)를 구비하고, 이들 3개의 유압펌프(P1,P2,P3)중 하나 또는 하나 이상의 유압펌프의 압유의 흐름을 제어하여 복수개의 유압 액츄에이터(도시생략)로 공급하는 컨트롤밸브(10)를 구비한다. As shown in FIG. 2, the hydraulic system of the compact excavator according to the present invention includes at least three hydraulic pumps, that is, a first hydraulic pump P1, a second hydraulic pump P2, and a third hydraulic pump P3. And a control valve 10 for controlling the flow of the pressurized oil of one or more of the three hydraulic pumps P1, P2, and P3 and supplying them to a plurality of hydraulic actuators (not shown).

상기 컨트롤밸브(10)는 우주행모터(도시생략)로 공급되는 유압펌프의 압유의 흐름을 제어하는 우주행제어스풀(11)과, 붐실린더(도시생략)로 공급되는 유압펌프의 압유를 제어하는 붐제어스풀(12), 버켓실린더(도시생략)로 공급되는 유압펌프의 압유의 흐름을 제어하는 버켓제어스풀(13)과, 좌주행모터(도시생략)로 공급되는 유압펌프의 압유의 흐름을 제어하는 좌주행제어스풀(14), 암실린더(도시생략)로 공급되는 유압펌프의 압유의 흐름을 제어하는 암제어스풀(15), 선회모터(도시생략)로 로 공급되는 유압펌프의 압유의 흐름을 제어하는 선회제어스풀(16), 도저실린더(도시생략)로 공급되는 유압펌프의 압유의 흐름을 제어하는 도저제어스풀(17)을 포함한다. The control valve 10 controls the pressure flow of the space flow control spool 11 for controlling the flow of pressure oil of the hydraulic pump supplied to the space travel motor (not shown) and the hydraulic pump supplied to the boom cylinder (not shown). The boom control spool 12, the bucket control spool 13 for controlling the flow of hydraulic pressure of the hydraulic pump supplied to the bucket cylinder (not shown) and the hydraulic oil flow of the hydraulic pump supplied to the left running motor (not shown) The pressure of the hydraulic pump supplied to the left driving control spool 14, the hydraulic control spool 15, which controls the flow of the hydraulic pressure of the hydraulic pump supplied to the dark cylinder (not shown), and the turning motor (not shown). A swing control spool 16 for controlling the flow of oil and a dozer control spool 17 for controlling the flow of pressure oil of the hydraulic pump supplied to the dozer cylinder (not shown) are included.

그리고 상기 우주행 제어스풀(11)과, 붐제어스풀(12) 및 버켓제어스풀(13)을 포함하는 프론트작업 제어스풀군(18)은 상기 제1유압펌프(P1)의 압유를 바이패스시키는 제1바이패스라인(L1)상에 차례로 배치되어 제1바이패스라인(L1)에 각 병렬라인을 통하여 병렬로 연결된다. The front work control spool group 18 including the space travel control spool 11, the boom control spool 12, and the bucket control spool 13 may bypass the oil pressure of the first hydraulic pump P1. It is arranged in order on the first bypass line (L1) and connected in parallel to the first bypass line (L1) through each parallel line.

또 좌주행제어스풀(14)과 암제어스풀(15)은 상기 제2유압펌프(P2)의 압유를 바이패스시키는 제2바이패스라인(L2)상에 차례로 배치되어 제2바이패스라인(L2)에 각 병렬라인을 통하여 병렬로 연결된다. In addition, the left running control spool 14 and the arm control spool 15 are sequentially arranged on the second bypass line L2 for bypassing the hydraulic oil of the second hydraulic pump P2, and thus the second bypass line L2. ) Are connected in parallel through each parallel line.

상기 선회제어스풀(16)과 도저제어스풀(17)은 제3유압펌프(P3)의 압유를 바이패스시키는 제3바이패스라인(L3)상에 순차적으로 배치되어 제3유압펌프(P3)에 병렬연결된다. The turning control spool 16 and the dozer control spool 17 are sequentially arranged on the third bypass line L3 for bypassing the hydraulic oil of the third hydraulic pump P3 to the third hydraulic pump P3. It is connected in parallel.

상기 도저 제어스풀(17)을 바이패스한 제3유압펌프(P3)의 압유는 제1합류라인(30)을 통하여 상기 프론트작업 제어스풀군(18)로 공급되고, 아울러 제2합류라인(31)을 통하여 암제어스풀(15)로도 합류되게 되어 있다.  The pressure oil of the third hydraulic pump P3 bypassing the doser control spool 17 is supplied to the front work control spool group 18 through the first confluence line 30, and the second confluence line 31 It is also joined to the arm control spool 15 through).

그리고, 합류밸브(20)는 상기 도저제어스풀(17)을 바이패스한 제3유압펌프(P3)의 압유를, 제1합류라인(30)에 제공하고 동시에 제2합류라인(31)에 제공하여 프론트작업장치에 공급되는 압유의 유량을 증가시킨다.  In addition, the confluence valve 20 provides the pressure oil of the third hydraulic pump P3 bypassing the doser control spool 17 to the first confluence line 30 and simultaneously to the second confluence line 31. To increase the flow rate of the pressure oil supplied to the front work equipment.

또 도 2 및 도 3에 도시된 바와 같이, 상기 합류밸브(20)는, 주행복합동작신호(Pic)가 작용하는 제1수압부(21A)와, 붐상승신호(Pup)가 작용하는 제2수압부(21B)를 일측에 구비하고, 타측에는 상기 주행복합동작신호(Pic)와 붐상승신호(Pup)에 대항하여 스프링(22)이 설치된다.In addition, as shown in FIGS. 2 and 3, the joining valve 20 includes a first hydraulic unit 21A to which the traveling combined operation signal Pic acts, and a second to which the boom lift signal Pup acts. A pressure receiving portion 21B is provided on one side, and the other side is provided with a spring 22 against the traveling combined operation signal Pic and the boom up signal Pup.

그리고 상기 합류밸브(20)는 상기 수압부(21A,21B)들에 아무런 신호가 작용하지 않은 경우에 상기 스프링(22)에 의해 유지되는 제1합류위치(20A)와, 상기 제1수압부(21A)에 주행복합동작신호(PiC)가 작용하는 경우에 절환되는 상기 제2합류위치(20B)와, 상기 제1수압부(21A)와 상기 제2수압부(21B)에 각각 주행복합동작신호 (Pic)와 붐상승신호(Pup)가 작용하는 경우에는 절환되는 제3합류위치(20C)를 가진다. In addition, the confluence valve 20 has a first confluence position 20A maintained by the spring 22 when no signal acts on the hydraulic pressure portions 21A and 21B, and the first hydraulic pressure portion ( The driving combined operation signal is respectively applied to the second confluence position 20B, the first hydraulic pressure portion 21A and the second hydraulic pressure portion 21B, which are switched when the combined traveling operation signal PiC is applied to 21A). When Pic and the boom up signal Pup act, it has a third confluence position 20C to be switched.

상기 합류밸브(20)의 제1합류위치(20A)에는, 상기 제3유압펌프(P3)의 바이패스라인(L3)을 제1합류라인(30)에 연결하는 제1유로(23A)와, 상기 제1유로(23A)에서 분기되어 상기 바이패스라인(L3)을 상기 제2합류라인(31)에 연결하는 제2유로(23B)가 구비된다. .A first flow path 23A for connecting the bypass line L3 of the third hydraulic pump P3 to the first confluence line 30 at the first confluence position 20A of the confluence valve 20; A second flow path 23B branched from the first flow path 23A and connecting the bypass line L3 to the second confluence line 31 is provided. .

제2합류위치(20B)에는 상기 제3유압펌프(P3)의 바이패스라인(L3)을 제1합류라인(30)에 연결하는 제3유로(24A)와, 상기 제3유로(24A)에서 분기되어 상기 바이패스라인(L3)을 상기 제2합류라인(31)에 연결하고 상기 제3유로(24A)보다 상대적으로 더 작은 유량을 통과시키도록 오리피스(24C)가 설치된 제4유로(24B)가 구비된다.  In the second confluence position 20B, the third flow passage 24A connecting the bypass line L3 of the third hydraulic pump P3 to the first confluence line 30 and the third flow passage 24A, respectively. Fourth flow path 24B branched to connect the bypass line L3 to the second confluence line 31 and allow an orifice 24C to pass a flow rate relatively smaller than the third flow path 24A. Is provided.

그리고 제3합류위치(20C)에는, 상기 제3유압펌프(P3)의 바이패스라인(L3)을 제1합류라인(30)에 연결하는 제5유로(25A)와, 상기 제3유로(25A)에서 분기되어 상기 바이패스라인(L3)을 상기 제2합류라인(31)에 연결하고 상기 제3유로(25A)보다 상대적으로 더 작은 유량을 통과시키도록 오리피스(25C)가 설치된 제6유로(25B)를 구비한 제3합류위치(20C)가 구비된다. In the third confluence position 20C, a fifth flow passage 25A for connecting the bypass line L3 of the third hydraulic pump P3 to the first confluence line 30, and the third flow passage 25A. A sixth flow path (25C) provided with an orifice (25C) branched from the flow path to connect the bypass line (L3) to the second confluence line (31) and to pass a flow rate relatively smaller than the third flow path (25A); A third confluence position 20C with 25B) is provided.

상기한 바와 같은 구성을 가진 본 발명에 따른 굴삭기의 주행복합동작 제어용 유압시스템의 작동을 설명한다. The operation of the hydraulic system for controlling the traveling combined motion of the excavator according to the present invention having the configuration as described above will be described.

주행과 프론트작업을 동시에 수행하는 경우에는, 합류밸브의 수압부에 주행복합신호가 작용하여 합류밸브가 주행복합의 제2합류위치로 절환하게 되고, 이 상 태에서 우주행장치와 좌주행장치에는 각각 제1유압펌프와 제2유압펌프에서 제공되고, 프론트작업장치쪽으로는 제1유압펌프 및 제2유압펌프의 압유와 함께 합류밸브를 거친 제3유압펌프의 압유가 제공되어 공급유량이 증가함으로써 프론트작업을 원활하게 수행하게 된다.  When traveling and front work are carried out at the same time, the driving compound signal acts on the hydraulic pressure part of the joining valve so that the joining valve is switched to the second joining position of the traveling compound. The first hydraulic pump and the second hydraulic pump are respectively provided, and the hydraulic pressure of the third hydraulic pump through the confluence valve is provided along with the hydraulic pressure of the first hydraulic pump and the second hydraulic pump toward the front work device, thereby increasing the supply flow rate. Front work is performed smoothly.

한편, 붐상승의 경우 또는 붐동작과 다른 프론트작업장치가 동시에 수행하는 붐복합동작의 경우에는 합류밸브는 수압부에 붐상승신호가 작용함으로써 암제어스풀쪽으로 합류되는 제3유압펌프의 유량을 상대적으로 줄여서 붐제어스풀과 버켓제어스풀쪽으로 합류되는 제3유압펌프의 유량을 증대시킴으로써 붐상승 동작 또는 붐복합동작의 성능을 향상시키게 된다.  On the other hand, in the case of the boom rise or in the case of the boom combined operation performed by the boom operation and another front work device at the same time, the joining valve is a flow rate of the third hydraulic pump joined to the arm control spool by the boom rise signal acting on the hydraulic pressure section. By increasing the flow rate of the third hydraulic pump joined to the boom control spool and the bucket control spool, the performance of the boom raising operation or the boom compound operation is improved.

상기한 바와 같이, 주행복합동작의 경우에 좌우측 주행장치에는 주행직진제어스풀에 의해 2개의 유압펌프(P1,P2)에서 합류된 유량이 균등하게 분배되어 직진주행이 이루어지고, 프론트작업장치에는 제1유압펌프(P1) 및 제2유압펌프(P2)의 합류유량의 일부와 제3유압펌프(P3)의 유량이 합류되어 공급되므로 프론트작업장치는 충분한 유량을 제공받아서 우수한 작업성능을 가진다. As described above, in the case of the combined traveling operation, the flow rates joined by the two hydraulic pumps P1 and P2 are equally distributed to the left and right traveling devices by the traveling straight control spool, and the straight running is performed. Since a part of the combined flow rate of the first hydraulic pump P1 and the second hydraulic pump P2 and the flow rate of the third hydraulic pump P3 are combined and supplied, the front work device is provided with a sufficient flow rate and has excellent work performance.

Claims (2)

적어도 3개의 유압펌프(P1,P2,P3)와, At least three hydraulic pumps (P1, P2, P3), 상기 제1유압펌프(P1)에 차례로 연결된 우주행 제어스풀(11)과, 붐 제어스풀(12) 및 버켓 제어스풀(13)로 이루어진 프론트작업 제어스풀군(18)과, 상기 제2유압펌프(P2)에 차례로 연결된 좌주행 제어스풀(14) 및 암제어스풀(15)과, 상기 제3유압펌프(P3)에 차례로 연결된 선회제어스풀(16) 및 도저제어스풀(17)을 구비한 컨트롤밸브(10)와,The space travel control spool 11, which is connected in turn to the first hydraulic pump P1, the boom control spool 12, and the bucket control spool 13, the front work control spool group 18, and the second hydraulic pump. Control having left running control spool 14 and arm control spool 15 connected in turn to P2, and turning control spool 16 and dozer control spool 17 in turn connected to the third hydraulic pump P3. With the valve 10, 상기 도저 제어스풀(17)을 바이패스한 제3유압펌프(P3)의 압유를 제1합류라인(30)과 제2합류라인(31)을 통해 상기 프론트작업 제어스풀군(18)과, 암제어스풀(15)에 각각 합류시키는 합류밸브(20)를 포함한 굴삭기의 복합동작 제어용 유압제어시스템에 있어서, The hydraulic pressure of the third hydraulic pump P3 bypassed the doser control spool 17 through the first confluence line 30 and the second confluence line 31, and the front work control spool group 18 and the arm. In the hydraulic control system for controlling the combined motion of an excavator including a confluence valve 20 for joining to the control spool 15, 상기 합류밸브(20)는,The confluence valve 20, 일측에는 주행복합동작신호(Pic)와 붐상승신호(Pup)가 작용하는 제1,2수압부(21A,21B)가 구비되고, 타측에는 스프링(22)이 설치되며,One side is provided with the first and second hydraulic pressure parts 21A and 21B on which the driving combined operation signal Pic and the boom up signal Pup are applied, and the spring 22 is installed on the other side. 상기 수압부(21A,21B)에 주행복합동작신호(Pic)와 붐상승신호(Pup)가 신호가 작용하지 않은 경우에 스프링(22)에 의해 절환되어 상기 제3유압펌프(P3)의 바이패스라인(L3)을 제1합류라인(30)과 연결하는 제1유로(23A)와 상기 제1유로(23A)에서 분기되어 상기 바이패스라인(L3)을 상기 제2합류라인(31)에 연결하는 제2유로(23B)를 구비하여 상기 제3유압펌프(P3)의 압유를 상기 제1유압펌프(P1) 및 상기 제2유압펌프(P2)의 압유에 합류시키는 제1합류위치(20A)와,When the combined driving signal Pic and the boom up signal Pup do not act on the hydraulic units 21A and 21B, the switch is switched by the spring 22 to bypass the third hydraulic pump P3. The first flow path 23A connecting the line L3 to the first confluence line 30 and the first flow path 23A branch to connect the bypass line L3 to the second confluence line 31. A first confluence position 20A having a second flow path 23B for joining the pressure oil of the third hydraulic pump P3 to the pressure oil of the first hydraulic pump P1 and the second hydraulic pump P2. Wow, 상기 제1수압부(21A)에만 주행복합동작신호(PiC)가 작용하는 경우에 절환되어 상기 제3유압펌프(P3)의 바이패스라인(L3)을 제1합류라인(30)에 연결하는 제3유로(24A)와, 상기 제3유로(24A)에서 분기되어 상기 바이패스라인(L3)을 상기 제2합류라인(31)에 연결하고 상기 제3유로(24A)보다 상대적으로 더 작은 유량을 통과시키도록 오리피스(24C)가 설치된 제4유로(24B)를 구비하여 상기 프론트작업 제어스풀군(18)에 상기 제3유압펌프(P3)의 압유를 제공하는 제2합류위치(20B)와,  A switch which switches when the combined driving signal PiC acts only on the first hydraulic part 21A to connect the bypass line L3 of the third hydraulic pump P3 to the first confluence line 30; Branched from the third flow passage 24A and the third flow passage 24A to connect the bypass line L3 to the second confluence line 31 and to generate a relatively smaller flow rate than the third flow passage 24A. A second confluence position (20B) having a fourth flow passage (24B) provided with an orifice (24C) to pass therethrough to provide the hydraulic pressure of the third hydraulic pump (P3) to the front work control spool group (18); 상기 제1수압부(21A)와 상기 제2수압부(21B)에 각각 주행복합동작신호(Pic)와 붐상승신호(Pup)가 작용하는 경우에 절환되어 상기 제3유압펌프(P3)의 바이패스라인(L3)을 제1합류라인(30)에 연결하는 제5유로(25A)와, 상기 제5유로(25A)에서 분기되어 상기 바이패스라인(L3)을 상기 제2합류라인(31)에 연결하고 상기 제5유로(25A)보다 상대적으로 더 작은 유량을 통과시키도록 오리피스(25C)가 설치된 제6유로(25B)를 구비하여 상기 제3유압펌프(P3)의 유량을 상기 암 제어스풀(15)보다 상기 프론트작업 제어스풀군(18)으로 증대시키는 제3합류위치(20C)를 구비한 것을 특징으로 하는 굴삭기의 복합동작제어용 유압제어시스템.  When the combined driving signal Pic and the boom up signal Pup act on the first hydraulic part 21A and the second hydraulic part 21B, respectively, the switching of the third hydraulic pump P3 is performed. A fifth flow path 25A connecting the pass line L3 to the first confluence line 30 and a branch from the fifth flow path 25A to divide the bypass line L3 into the second confluence line 31. And a sixth flow path 25B having an orifice 25C installed therein so as to pass a flow rate that is relatively smaller than the fifth flow path 25A, so that the flow rate of the third hydraulic pump P3 is controlled by the arm control spool. And a third confluence position (20C) which increases to the front work control spool group (18) from (15). 제1항에 있어서,The method of claim 1, 상기 합류밸브(20)는 상기 제2수압부(21B)에 작용하는 붐상승신호(Pup)의 세기에 비례하여 상기 오리피스(25C)의 개구면적을 감소시키는 것을 특징으로 하는 것을 특징으로 하는 굴삭기의 복합동작제어용 유압제어시스템. The confluence valve 20 of the excavator, characterized in that for reducing the opening area of the orifice (25C) in proportion to the strength of the boom up signal (Pup) acting on the second hydraulic portion (21B). Hydraulic control system for combined motion control.
KR1020050132827A 2005-12-29 2005-12-29 Hydraulic control system for combined operation of en excavator KR101251108B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020050132827A KR101251108B1 (en) 2005-12-29 2005-12-29 Hydraulic control system for combined operation of en excavator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020050132827A KR101251108B1 (en) 2005-12-29 2005-12-29 Hydraulic control system for combined operation of en excavator

Publications (2)

Publication Number Publication Date
KR20070070350A KR20070070350A (en) 2007-07-04
KR101251108B1 true KR101251108B1 (en) 2013-04-04

Family

ID=38505659

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020050132827A KR101251108B1 (en) 2005-12-29 2005-12-29 Hydraulic control system for combined operation of en excavator

Country Status (1)

Country Link
KR (1) KR101251108B1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030038362A (en) * 2001-11-09 2003-05-16 가부시키카이샤 나브코 Hydraulic circuit
JP2005121043A (en) * 2003-10-14 2005-05-12 Nabtesco Corp Hydraulic circuit and confluence valve in the circuit
JP2005214005A (en) * 2005-02-17 2005-08-11 Nabtesco Corp Oil pressure circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030038362A (en) * 2001-11-09 2003-05-16 가부시키카이샤 나브코 Hydraulic circuit
JP2003148407A (en) * 2001-11-09 2003-05-21 Nabco Ltd Oil pressure circuit
JP2005121043A (en) * 2003-10-14 2005-05-12 Nabtesco Corp Hydraulic circuit and confluence valve in the circuit
JP2005214005A (en) * 2005-02-17 2005-08-11 Nabtesco Corp Oil pressure circuit

Also Published As

Publication number Publication date
KR20070070350A (en) 2007-07-04

Similar Documents

Publication Publication Date Title
JP5564215B2 (en) Hydraulic system for construction machinery
KR101088753B1 (en) hydraulic control system for excavator
JP6200498B2 (en) Hydraulic drive unit for construction machinery
JP5996778B2 (en) Hydraulic drive unit for construction machinery
JP5669448B2 (en) Hydraulic drive system for excavator
JP2009150553A (en) Hydraulic drive control device
JP2008286397A (en) Traveling device for crawler type construction machine
JP4425805B2 (en) Hydraulic circuit
US9057175B2 (en) Construction machine with hydraulic circuit
JP2010101095A (en) Hydraulic control device for working machine
JP2769800B2 (en) Heavy equipment straight running device
US9181677B2 (en) Construction machine having hydraulic circuit
KR101260072B1 (en) Hydraulic control system for combined operation of en excavator
KR20110072719A (en) Sudden turning prevention system for construction machinery
KR101080173B1 (en) A main control valve assembly for excavator with multiple control valve units
JP2003184815A (en) Hydraulic controlled device of construction machine and hydraulic controlled device of hydraulic power shovel
KR100988429B1 (en) Apparatus for controlling multiple operations of an excavator
KR101324355B1 (en) Hydraulic system for small-sized excavator to improve bucket speed
KR101251108B1 (en) Hydraulic control system for combined operation of en excavator
KR101157267B1 (en) Hydraulic control system for a travel-combined-operation of en excavator
JP2016133206A (en) Hydraulic circuit for construction machine
JP2007120512A (en) Hydraulic control device for working machine
KR20080050697A (en) Signal sensing device of control valve for small-sized excavator
KR102510441B1 (en) Hydraulic system of construction equipment
JP5996416B2 (en) Hydraulic circuit for construction machinery

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20161227

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20180102

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20181217

Year of fee payment: 7

FPAY Annual fee payment

Payment date: 20200103

Year of fee payment: 8