KR20010061822A - A regeneration hydraulic circuit for the arm cylinder in an excavator - Google Patents

A regeneration hydraulic circuit for the arm cylinder in an excavator Download PDF

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Publication number
KR20010061822A
KR20010061822A KR1019990064364A KR19990064364A KR20010061822A KR 20010061822 A KR20010061822 A KR 20010061822A KR 1019990064364 A KR1019990064364 A KR 1019990064364A KR 19990064364 A KR19990064364 A KR 19990064364A KR 20010061822 A KR20010061822 A KR 20010061822A
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South Korea
Prior art keywords
arm
line
regeneration
cylinder
hydraulic
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KR1019990064364A
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Korean (ko)
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KR100655974B1 (en
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김용채
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양재신
대우종합기계 주식회사
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    • 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
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • 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
    • E02F9/2285—Pilot-operated systems
    • 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

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: An arm cylinder regenerative oil hydraulic circuit controller of an excavator is provided to prevent the cavitation of an arm cylinder on arm crowd motion and to control an arm cylinder regenerative oil passage not to lower the efficiency of excavation requiring heavy loads relatively. CONSTITUTION: An arm cylinder regenerative oil hydraulic circuit controller of an excavator comprises a main pump(1), an arm-controlling spool(3) controlling the direction and flow rate of the pressure oil of the main pump and supplying to an arm cylinder(2), a regeneration line(6) communicated from a supply passage(4) formed in the arm-controlling spool, a regeneration selecting valve(13) installed to a drain line(10) connected to an oil tank(11) from the arm-controlling spool to cross by the drain line when the arm-controlling spool is converted by arm crowd motion, wherein the regeneration selecting valve is connected to the piston head side chamber(2a) of the arm cylinder through a signal line(16) as for one side of a water pressure unit and connected to a pilot line(14) of an auxiliary oil hydraulic pump(15) as for the other side of a water pressure unit and the throttling degree of the drain line is adjustable by the difference of pressure between the signal line and the pilot line.

Description

굴삭기의 암실린더 재생유압회로 제어장치{A regeneration hydraulic circuit for the arm cylinder in an excavator}A regeneration hydraulic circuit for the arm cylinder in an excavator

본 발명은 굴삭기의 암실린더 재생유압회로 제어장치에 관한 것으로, 특히 작업모드에 따라 암실린더를 제어할 수 있는 굴삭기의 암실린더 재생유압회로 제어장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control apparatus for regulating hydraulic cylinders of excavators, and more particularly, to a control apparatus for regulating hydraulic cylinders of excavators capable of controlling the female cylinders according to working modes.

굴삭기에서 암실린더의 피스톤로드측 체임버에 펌프의 압유를 공급하여 피스톤로드를 신장하면 암은 안쪽으로 굽혀지는 동작(크라우드: crowd)을 하게 된다. 이때 암은 정지상태에서도 자체중량 및 버켓하중에 의한 관성부하를 받아서 낙하하거나 암크라우드 동작시 암실린더가 급속히 동작하게 되고, 이에 따라 펌프에서 공급하는 압유 속도보다 암실린더가 움직이는 속도가 빠르기 때문에 유압펌프에서 암실린더 피스톤헤드측 체임버에 보충되는 유량이 부족하게 되어 암실린더 피스톤헤드측 체임버에 캐비테이션이 발생하게 된다.When the excavator extends the piston rod by feeding the pump oil to the piston rod side chamber of the cylinder, the arm is bent inwardly (crowd: crowd). At this time, the arm receives the inertial load due to its own weight and bucket load even when it is stopped, or the arm cylinder moves rapidly when the arm cloud operates.As a result, the arm cylinder moves faster than the hydraulic pressure supplied from the pump. The flow rate supplemented to the dark cylinder piston head side chamber is insufficient in the cavitation occurs in the dark cylinder piston head side chamber.

이에 종래에는 도 1에 도시된 바와 같이 상기 암제어스풀에 재생회로를 설치하여 암실린더의 크라우드 동작시 암실린더 피스톤헤드측 체임버에 부족한 압유를 보충하여 캐비테이션을 방지하도록 되어 있다.In the related art, as shown in FIG. 1, a regeneration circuit is installed in the arm control spool to compensate for cavitation by supplementing insufficient pressure oil in the dark cylinder piston head side chamber during crowd cylinder operation.

상기 종래의 암실린더의 재생회로는 도 1에 도시된 바와 같이, 메인펌프(100)에서 토출되는 압유가 암제어스풀(110)을 거쳐 암실린더(120)로 공급되어지고, 상기 암제어스풀(110)과 오일탱크(130)를 연결시키는 드레인라인(101)에 드레인되는 압유의 량을 제어하는 재생선택밸브(140)가 설치되어 있다. 그리고 상기 재생선택밸브(140)는 한쪽 파이롯수압부에 파이롯펌프(150)로부터 파이롯신호라인(102)을 따라 파이롯신호를 받을 경우 상기 드레인라인(101)을 교축하거나 상기 파이롯신호를 받지 않을 경우에는 정상적으로 드레인시키도록 되어 있으며, 상기 파이롯신호라인(102)상에는 암 크라우드신호를 받을 경우에만 상기 재생선택밸브(140)에 파이롯신호압을 작용하도록 솔레노이드 차단밸브(160)가 설치된다. 그리고 상기 암제어스풀(110)의 암크라우드측 위치에는 배출통로(111)와 공급통로(112)를 서로 연통시키는 재생라인(113)가 구비되고, 상기 재생라인(113)에는 체크밸브(114)가 설치되어 배출압유가 배출통로(111)에서 공급통로(112)쪽으로만 흐르게 되어 있다.In the regeneration circuit of the conventional dark cylinder, as shown in FIG. 1, the pressurized oil discharged from the main pump 100 is supplied to the dark cylinder 120 through the dark control spool 110, and the dark control spool ( A regeneration selection valve 140 for controlling the amount of pressure oil drained in the drain line 101 connecting the 110 and the oil tank 130 is installed. The regenerative selection valve 140 throttles or drains the drain line 101 when the pilot signal is received along the pilot signal line 102 from the pilot pump 150 at one pilot hydraulic unit. When no signal is received, the drain is normally drained, and the solenoid shutoff valve 160 acts on the pilot signal line 102 to apply a pilot signal pressure to the regeneration selector valve 140 only when an arm crowd signal is received. Is installed. In addition, a regeneration line 113 is provided at the arm cloud side of the arm control spool 110 to communicate the discharge passage 111 and the supply passage 112 with each other, and the regeneration line 113 has a check valve 114. Is installed so that the discharge pressure oil flows only from the discharge passage 111 toward the supply passage 112.

따라서 상기와 같은 종래의 재생회로를 구비한 굴삭기에서 암실린더(120)가 신장하여 암이 크라우드동작을 할 때 그 암실린더(120)의 피스톤로드측 체임버(122)에서 배출되는 압유중 일부는 재생선택밸브(140)에 의해 교축된 후 드레인라인(101)을 따라 탱크(130)쪽으로 배출되고, 나머지 압유는 암제어스풀(110)의 재생라인(113)을 거쳐 암실린더(120)의 피스톤헤드측 체임버(121)에 유입되어 암실린더의 캐비테이션을 방지하고 암실린더의 속도를 빠르게한다.Therefore, in the excavator having the conventional regeneration circuit as described above, when the arm cylinder 120 is extended and the arm is crowded, part of the hydraulic oil discharged from the piston rod side chamber 122 of the arm cylinder 120 is regenerated. After being throttled by the selector valve 140 and discharged toward the tank 130 along the drain line 101, the remaining pressure oil passes through the regeneration line 113 of the arm control spool 110 and the piston head of the arm cylinder 120. It flows into the side chamber 121 to prevent cavitation of the dark cylinder and to speed up the dark cylinder.

그러나 비교적 중부하 이상의 암크라우드 작업을 할 경우에는 상기 암실린더(120)의 피스톤로드측 체임버(122)에서 배출되는 압유는 재생선택밸브(140)에 의해 제한되므로 인해 메인펌프(100)에서 상기 암실린더의 피스톤헤드측 체임버(121)로 공급되는 고압의 압유는 오히려 줄어들어 암크라우드 동작에 따른 굴삭력은 저하되는 문제점이 있었다.However, when the arm cloud operation is relatively heavy load, the pressure oil discharged from the piston rod side chamber 122 of the arm cylinder 120 is limited by the regeneration selection valve 140, so the arm in the main pump 100 The pressure of the high pressure supplied to the piston head side chamber 121 of the cylinder is rather reduced, and there is a problem that the digging force due to the arm crowd operation is lowered.

이에 본 발명은 상기와 같은 문제점을 해결하기 위해 고안된 것으로, 암 크라우드동작시 암실린더의 캐비테이션 현상을 방지하고 아울러 상대적으로 큰 부하가 걸리는 굴삭작업시 그 굴삭력이 저하되지 않도록 한 암실린더 재생유로를 제어하는 장치를 제공함에 목적이 있다.Therefore, the present invention is designed to solve the above problems, and to prevent the cavitation phenomenon of the arm cylinder during the arm crowd operation, and also to reduce the digging force during the excavation work that takes a relatively large load, the dark cylinder regeneration flow path It is an object to provide a controlling device.

상기와 같은 목적을 달성하기 위한 본 발명은, 메인펌프와, 상기 메인펌프의 압유를 방향 및 유량 제어하여 암실린더에 공급하는 암제어스풀과, 암크라우드 조작시 상기 암제어스풀의 배출통로를 공급통로 쪽으로 연통시키는 재생라인을 포함하고, 상기 암제어스풀과 오일탱크를 연결시키는 드레인라인에는 암 실린더의 피스톤 헤드측체임버의 압력과 보조펌프의 압력의 압력과의 차압에 의해 가변교축되는 재생선택밸브를 구비하되, 상기 재생선택밸브는 상기 암실린더의 피스톤헤드측 체임버의 압력이 보조펌프의 압력보다 작을수록 상기 드레인라인의 개도를 작게 교축시키도록 구성으로 된 것이다.The present invention for achieving the above object, the main pump, the arm control spool for supplying to the dark cylinder by controlling the direction and flow rate of the pressure oil of the main pump, and supplying the discharge passage of the arm control spool during the arm cloud operation A regeneration line communicating with the passage, wherein the drain line connecting the arm control spool and the oil tank has a regenerative selection valve variably throttled by a pressure difference between the pressure of the piston head side chamber of the arm cylinder and the pressure of the pressure of the auxiliary pump. Wherein, the regeneration selection valve is configured to throttle the opening degree of the drain line smaller as the pressure of the piston head side chamber of the dark cylinder is less than the pressure of the auxiliary pump.

상기와 같이 이루어진 본 발명의 장치는 암크라우드 작동시 암실린더의 피스톤로드측 체임버에서 드레인라인을 따라 탱크로 배출되는 압유를 줄이고 나머지 배출압유를 암제어스풀의 재생회로를 따라 암실린더 피스톤헤드측 체임버로 귀환시킴으로써 암실린더의 캐비테이션을 방지하고, 나아가 암실린더의 속도를 증진시킨다. 또한, 굴삭작업을 하던 중 암실린더의 출구측 압유의 압력이 소정압력이상으로 상승하는 중부하 이상의 굴삭작업시에는 상기 드레인라인을 교축시키지 않고 개도면적을 증가시켜 상대적으로 많은 량의 압유를 탱크로 드레인시킴으로써 암실린더의 피스톤헤드측으로 고압의 메인펌프 압유를 공급하여 굴삭력을 향상시킨다.The apparatus of the present invention made as described above reduces the pressure oil discharged from the piston rod side chamber of the dark cylinder to the tank along the drain line during the operation of the arm cloud, and the remaining discharge pressure oil is stored along the regeneration circuit of the arm control spool. By returning to, the cavitation of the dark cylinder is prevented and further the speed of the dark cylinder is increased. In addition, during the excavation work of heavy loads in which the pressure of the outlet pressure oil of the dark cylinder rises above a predetermined pressure during the excavation work, the opening area is increased without throttling the drain line, and a relatively large amount of pressure oil is transferred to the tank. By draining, the high pressure main pump pressure oil is supplied to the piston head side of the dark cylinder to improve the digging force.

도 1은 종래 굴삭기의 암실린더 재생유압회로 제어장치의 유압회로도,1 is a hydraulic circuit diagram of a conventional hydraulic cylinder control hydraulic circuit control device of an excavator;

도 2는 본 발명에 따른 굴삭기의 암실린더 재생유압회로 제어장치의 유압회로도이다.2 is a hydraulic circuit diagram of an apparatus for regulating hydraulic cylinder of a hydraulic cylinder of an excavator according to the present invention.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1: 메인펌프 2: 암실린더1: main pump 2: dark cylinder

3: 암제어스풀 4: 공급통로3: arm control spool 4: supply passage

5: 배출통로 6: 재생라인5: discharge passage 6: recycling line

7: 체크밸브 8: 제1압유라인7: Check valve 8: 1st pressure oil line

9: 제2압유라인 10: 드레인라인9: second pressure oil line 10: drain line

11: 탱크 12: 부하유지밸브11: tank 12: load holding valve

13: 재생선택밸브 13a: 오리피스13: Regenerative selector valve 13a: Orifice

14: 파이롯라인 15: 보조펌프14: pilot line 15: auxiliary pump

이하 본 발명을 첨부한 예시도면을 참조하여 자세히 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

도 1은 본 발명에 따른 굴삭기의 암실린더 재생유압회로 제어장치의 개략적인 유압회로도이다.1 is a schematic hydraulic circuit diagram of an apparatus for regenerating a hydraulic cylinder of an excavator of an excavator according to the present invention.

본 발명은 도 1에 도시된 바와 같이, 메인펌프(1)와, 상기 메인펌프(1)의 압유의 방향 및 유량을 제어하여 암실린더(2)에 공급하는 암제어스풀(3)를 포함한다. 상기 암제어스풀(3)은 리모트콘트롤밸브(도시안됨)로부터 암크라우드 신호압(Pa) 또는 암덤프 신호압(Pb)을 양쪽 각 파이롯수압부에 선택적으로 받아서 좌측 또는 우측으로 절환하면서 상기 메인펌프(1)에서 토출된 압유를 제1압유라인(8)을 통하여 암실린더(2)의 피스톤헤드측 체임버(2a)로 공급하거나, 제2압유라인(9)을 통하여 암실린더(2)의 피스톤로드측 체임버(2b)에 공급하고, 암실린더(2)에서 배출되는 압유는 각각 제1압유라인(8) 또는 제2압유라인(9)을 따라 암제어스풀(3)의 배출통로(4)를 거친 다음, 드레인라인(10)을 따라 탱크(11)로 드레인되게 된다.As shown in FIG. 1, the present invention includes a main pump 1 and an arm control spool 3 for controlling the direction and flow rate of the pressurized oil of the main pump 1 and supplying it to the arm cylinder 2. . The female control spool 3 receives a female crowd signal pressure (Pa) or a female dump signal pressure (Pb) from both remote control valves (not shown) selectively to both pilot pressure sections, and switches the left or right side to the main. The hydraulic oil discharged from the pump 1 is supplied to the piston head side chamber 2a of the female cylinder 2 through the first hydraulic oil line 8 or the female cylinder 2 through the second hydraulic oil line 9. The hydraulic oil supplied to the piston rod side chamber (2b) of the () and discharged from the dark cylinder (2) is respectively along the first hydraulic oil line (8) or the second hydraulic oil line (9) of the arm control spool (3). After passing through the discharge passage 4, it is drained to the tank 11 along the drain line 10.

그리고 상기 암실린더(2)의 피스톤로드측 체임버(2b)와 암제어스풀(3)의 포트를 연결하는 제2압유라인(9)에는 부하유지밸브(12)가 설치되어 있고, 이 부하유지밸브(12)는 암제어스풀(3)이 중립시 암실린더(2)의 피스톤로드측 체임버(2b)에서 암제어스풀(3)쪽으로 배출되는 압유를 차단하여 암이 자중에 의해 낙하하는 것을 방지한다.In addition, a load holding valve 12 is provided in the second pressure oil line 9 connecting the piston rod side chamber 2b of the arm cylinder 2 and the port of the arm control spool 3. The valve 12 blocks the hydraulic oil discharged from the piston rod side chamber 2b of the arm cylinder 2 toward the arm control spool 3 when the arm control spool 3 is neutral to prevent the arm from dropping by its own weight. do.

상기 암제어스풀(3)의 암크라우드 위치에는 배출통로(4)에서 공급통로(5)로 연통시키는 재생라인(6)이 체크밸브(7)을 개재하여 형성되어 있다.In the female crowd position of the arm control spool 3, a regeneration line 6 for communicating from the discharge passage 4 to the supply passage 5 is formed via the check valve 7.

즉, 암제어스풀(3)은 암이 크라우드 동작을 할 때 피스톤로드측 체임버(2b)에서 배출통로(4)를 따라 배출되는 압유중 일부를 피스톤헤드측 체임버(2a)로 귀환시켜 피스톤헤드측 체임버(2a)의 공급압유를 보충함으로써 암실린더(2)의 급작스러운 신장작동에 따른 피스톤헤드측 체임버(2a)의 캐비테이션현상을 방지하거나, 암실린더의 속도를 증진시키도록 되어 있다.That is, the arm control spool 3 returns a portion of the hydraulic oil discharged along the discharge passage 4 from the piston rod side chamber 2b to the piston head side chamber 2a when the arm is crowded. By replenishing the supply pressure oil of the chamber 2a, the cavitation phenomenon of the piston head side chamber 2a caused by the sudden expansion operation of the arm cylinder 2 is prevented or the speed of the arm cylinder is increased.

그리고 상기 암제어스풀(3)의 드레인포트는 드레인라인(10)을 통하여 탱크(11)와 연결되고, 이 드레인라인(10)에는 유로를 가변교축하는 재생선택밸브(13)가 연결설치된다.A drain port of the arm control spool 3 is connected to the tank 11 through the drain line 10, and a regeneration selection valve 13 for variably throttling a flow path is connected to the drain line 10. .

상기 재생선택밸브(13)의 한쪽 파이롯수압부는 파이롯라인(14)를 통해 보조펌프(15)에 연결되고, 다른 쪽 파이롯수압부는 암실린더(2)의 피스톤헤드측 체임버(2a)와 신호라인(16)을 통해 연결되어 있다. 한편, 상기 파이롯라인(14)에는 작업모드 선택신호에 따라 상기 파이롯라인(14)을 개방 또는 폐쇄하는 솔레노이드 개폐밸브(17)가 부가적으로 설치되어 있다.One pilot hydraulic part of the regeneration selector valve 13 is connected to the auxiliary pump 15 through a pilot line 14, and the other pilot hydraulic part is connected to the piston head side chamber 2a of the female cylinder 2. It is connected via a signal line 16. On the other hand, the pilot line 14 is additionally provided with a solenoid valve 17 for opening or closing the pilot line 14 in accordance with the operation mode selection signal.

따라서 상기한 바와 같이 구성된 본 발명의 작동을 단계별로 설명하면 다음과 같다.Therefore, the operation of the present invention configured as described above will be described step by step.

경부하 암크라우드 작동시During light load amcloud operation

리모트콘트롤밸브를 암크라우드 방향으로 작동시키면 이 리모트콘트롤밸브는 출구측으로 암크라우드 파이롯압력신호(Pa)를 발생시킨다. 이 암크라우드 파이롯압력신호(Pa)는 암제어스풀(3)의 우측 수압부에 작용하여 암제어스풀(3)을 크라우드 위치로 절환시키는 한편, 상기 파이롯라인(14)의 개폐밸브(17)가 파이롯라인(14)을개방시키고 있는 경우 보조펌프(15)의 압유는 상기 파이롯라인(14)을 통하여 재생선택밸브(13)의 한쪽 수압부에 작용함에 따라, 이 재생선택밸브(13)는 절환하여 상기 드레인라인(10)을 교축시키는 쪽으로 작용하게 된다.When the remote control valve is operated in the dark crowd direction, the remote control valve generates a dark crowd pilot pressure signal Pa at the outlet side. The female crowd pilot pressure signal Pa acts on the right side hydraulic section of the female control spool 3 to switch the female control spool 3 to the crowd position, while the on / off valve 17 of the pilot line 14 is closed. ) Opens the pilot line 14, the pressure oil of the auxiliary pump 15 acts on one hydraulic part of the regeneration selection valve 13 through the pilot line 14, so that the regeneration selection valve ( 13 is switched to act to throttle the drain line 10.

한편, 메인펌프(1)의 압유는 암제어스풀(3)의 공급통로(5)을 통과한 후, 제1압유라인(8)을 거쳐 암실린더(2)의 피스톤헤드측 체임버(2a)로 유입되어 피스톤을 밀어내리고, 이로써 피스톤로드측 체임버(2b)에 들어 있던 압유는 제2압유라인(9)을 따라 배출된 후, 암제어스풀(3)의 배출통로(4)를 거치면서 일부는 드레인라인(10)을 따라 탱크(11)로 드레인되지만, 나머지 압유는 재생라인(6)을 따라 다시 암실린더(2)의 피스톤헤드측 체임버(2a)로 재생 공급된다. 이로써 암크라우드 동작도중에 암의 자중이나 버켓의 하중에 의해 피스톤로드측 체임버(2b)가 급속히 팽창하더라도 상기 귀환압유에 의해 충전되므로 암실린더(2)의 피스톤헤드측 체임버(2a)의 캐비테이션 현상은 발생하지 않게 되될 뿐만아니라, 암실린더의 크라우드 동작을 보다 빠르게 수행한다.On the other hand, the pressure oil of the main pump 1 passes through the supply passage 5 of the arm control spool 3 and then passes through the first pressure oil line 8 to the piston head side chamber 2a of the female cylinder 2. Flows into the piston and pushes down the piston, whereby the pressure oil contained in the piston rod side chamber 2b is discharged along the second pressure oil line 9 and then passes through the discharge passage 4 of the arm control spool 3. A part is drained to the tank 11 along the drain line 10, but the remaining pressurized oil is regenerated and supplied to the piston head side chamber 2a of the arm cylinder 2 along the regeneration line 6 again. As a result, even when the piston rod side chamber 2b rapidly expands due to the weight of the arm or the bucket load during arm cloud operation, the cavitation phenomenon of the piston head side chamber 2a of the arm cylinder 2 occurs because it is filled by the feedback pressure oil. Not only that, but also the crowding of the dark cylinder is performed faster.

이 때 상기 재생선택밸브(13)는 신호라인(16)을 통해 일측 수압부로 암실린더(2)의 피스톤헤드측 체임버(2a) 압력을 공급받지만, 파이롯라인(14)를 통해 타측 수압부로 공급되는 보조펌프(15)의 압력을 이기지 못해 재생선택밸브(13)는 드레인라인(10)을 더욱 좁게 교축시켜 재생유량을 더욱 증대시킨다.At this time, the regeneration selection valve 13 receives the pressure of the piston head side chamber 2a of the arm cylinder 2 through the signal line 16 through the signal line 16, but through the pilot line 14 to the other hydraulic pressure section. Since the pressure of the auxiliary pump 15 is not overcome, the regeneration selection valve 13 narrows the drain line 10 more narrowly to further increase the regeneration flow rate.

중부하 이상의 암크라우드 동작시In heavy cloud operation

상기 경부하 암크라우드 동작시와 동일하지만, 다만, 신호라인(16)을 통해 일측 수압부로 공급되는 암실린더(2)의 피스톤헤드측 체임버(2a) 압력이 파이롯라인(14)를 통해 타측 수압부로 공급되는 보조펌프(15)의 압력보다 크게 되어 상기 재생선택밸브(13)의 드레인라인(10) 교축정도를 최대한 억제하여 재생유량을 극소화 시킨다.The same as in the light load female crowd operation, except that the pressure of the piston head side chamber 2a of the arm cylinder 2 supplied to the one side hydraulic portion through the signal line 16 is the other side hydraulic pressure through the pilot line 14. It becomes larger than the pressure of the auxiliary pump 15 supplied to the negative portion to minimize the throttling degree of the drain line 10 of the regeneration selection valve 13 to minimize the regeneration flow rate.

이상에서 설명한 바와 같이 본 발명에 따른 굴삭기의 암실린더 재생유압회로 제어장치는 경부하 암크라우드 작동시 암실린더의 피스톤로드측 체임버(2b)에서 드레인라인(10)을 따라 탱크(11)로 배출되는 압유 중 일부를 암제어스풀(3)의 재생회로를 따라 암실린더 피스톤헤드측 체임버(2a)로 귀환시킴으로써 암실린더(2)의 캐비테이션을 방지 및 암실린더의 속도를 증진시키는 한편, 중부하 암크라우드 동작시는 드레인라인(10)을 교축시키지 않고 개도면적을 증가시켜 상대적으로 고압의 메인펌프 압유를 암실린더로 공급함으로써 굴삭력을 향상시킨다.As described above, the apparatus for regenerating the hydraulic cylinder of the excavator according to the present invention is discharged from the piston rod side chamber 2b of the female cylinder to the tank 11 along the drain line 10 during operation of the light load arm cloud. Part of the hydraulic oil is returned to the female cylinder piston head side chamber 2a along the regeneration circuit of the arm control spool 3, thereby preventing the cavitation of the female cylinder 2 and increasing the speed of the female cylinder, while In operation, the opening area is increased without throttling the drain line 10, thereby supplying a relatively high pressure main pump pressure oil to the dark cylinder to improve the digging force.

Claims (2)

메인펌프(1)와, 상기 메인펌프(1)의 압유를 방향 및 유량 제어하여 암실린더(2)에 공급하는 암제어스풀(3)과, 상기 암제어스풀(3)의 내부에 형성된 배출통로(4)로 부터 공급통로(5)로 연통되는 재생라인(6)과, 상기 암제어스풀(3)로 부터 오일탱크(11)로 연결되는 드레인라인(10)에 설치되어 상기 암제어스풀(3)이 암크라우드 동작으로 절환될 때 상기 드레인라인(10)을 교축하는 재생선택밸브(13)를 포함한 굴삭기의 재생유압회로 장치에 있어서,A main control pump (1), an arm control spool (3) for controlling the direction and flow rate of the oil pressure of the main pump (1) and supplying it to the arm cylinder (2), and a discharge passage formed inside the arm control spool (3). (4) is installed in the regeneration line (6) communicating with the supply passage (5), and the drain line (10) connected from the arm control spool (3) to the oil tank (11) and the arm control spool ( In the regeneration hydraulic circuit device of an excavator comprising a regeneration selection valve 13 for throttling the drain line 10 when 3) is switched to the dark crowd operation. 상기 재생선택밸브(13)는 일측 수압부로는 상기 암실린더(2)의 피스톤헤드측 체임버(2a)와 신호라인(16)을 통해 연결하고, 타측 수압부로는 보조유압펌프(15)의 파이롯라인(14)과 연결되며, 상기 신호라인(16) 및 파이롯라인(14)의 압력차이에 의해 상기 드레인라인(10)을 교축정도를 가변시키도록 구성된 것을 특징으로 하는 굴삭기의 암실린더 재생유압회로 제어장치.The regeneration selection valve 13 is connected to the piston head side chamber 2a of the female cylinder 2 through the signal line 16 through one side hydraulic part, and a pilot of the auxiliary hydraulic pump 15 through the other hydraulic part. Connected to the line 14, the hydraulic cylinder regeneration hydraulic pressure of the excavator, characterized in that configured to vary the degree of throttling of the drain line 10 by the pressure difference between the signal line 16 and the pilot line 14 Circuit controller. 제 1 항에 있어서, 상기 파이롯라인(14) 상에는 작업모드 선택신호에 따라 개폐되는 개폐밸브(17)를 추가로 연결한 것을 특징으로 하는 굴삭기의 암실린더 재생유압회로 제어장치.2. The apparatus of claim 1, wherein the pilot line (14) is further connected with an opening / closing valve (17) which opens and closes according to a work mode selection signal.
KR1019990064364A 1999-12-29 1999-12-29 A regeneration hydraulic circuit for the arm cylinder in an excavator KR100655974B1 (en)

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KR100884870B1 (en) * 2004-04-16 2009-02-23 현대중공업 주식회사 Variable Priority System of Control Valve on Excavator
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CN110770401A (en) * 2017-06-19 2020-02-07 卡特彼勒Sarl Engineering machinery bucket rod control system
US11162245B2 (en) 2017-06-19 2021-11-02 Caterpillar Sarl Stick control system in construction machine
CN110984283A (en) * 2019-12-25 2020-04-10 上海华兴数字科技有限公司 Energy-saving control method and device and excavator
CN110984283B (en) * 2019-12-25 2022-03-01 上海华兴数字科技有限公司 Energy-saving control method and device and excavator

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