KR20090069424A - Oil pressure system of forklift for improving pressure reduction - Google Patents

Oil pressure system of forklift for improving pressure reduction Download PDF

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KR20090069424A
KR20090069424A KR1020070137078A KR20070137078A KR20090069424A KR 20090069424 A KR20090069424 A KR 20090069424A KR 1020070137078 A KR1020070137078 A KR 1020070137078A KR 20070137078 A KR20070137078 A KR 20070137078A KR 20090069424 A KR20090069424 A KR 20090069424A
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South Korea
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control valve
hydraulic
flow rate
valve panel
panel
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KR1020070137078A
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Korean (ko)
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KR101437167B1 (en
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고현기
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두산인프라코어 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07504—Accessories, e.g. for towing, charging, locking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/0759—Details of operating station, e.g. seats, levers, operator platforms, cabin suspension

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

An oil-hydraulic system of a forklift truck is provided to reduce the pressure loss and heat generation by minimizing a recursive structure of output flux in the driving. An oil-hydraulic system of a forklift truck comprises: a hydraulic pump(100) discharging fluid; an inflow controlling valve shelf(200) including a relief valve(220), installed between a discharge hydraulic line and a drain hydraulic line(700); a solenoid valve(210) installed at one side water pressure part of the relief valve in order to control the relief pressure of the relief valve; a lifting control valve shelf(300) successively connected and arranged to the downstream of the inflow controlling valve shelf; and a controller controlling the operation of the solenoid valve, auxiliary spool displacement sensor(500a, 500b, 600a, 600b), lifting spool displacement sensors(300a, 300b), tilting spool displacement sensors(400a, 400b), a tilting control valve shelf(400) and a plurality of assistant control valve shelves(500, 600).

Description

압력손실을 개선한 지게차의 유압시스템{Oil Pressure System of Forklift for improving Pressure Reduction}Oil Pressure System of Forklift for improving Pressure Reduction

본 발명은 압력손실을 개선한 지게차의 유압시스템에 관한 것으로, 보다 상세하게는 유압펌프 토출유량의 순환에 따른 압력손실 및 발열을 줄일 수 있도록 작업여부에 따른 토출유량의 선택적 순환을 통해 토출유량의 순환경로를 단순화시킨 압력손실을 개선한 지게차의 유압시스템에 관한 것이다.The present invention relates to a hydraulic system of a forklift truck with improved pressure loss, and more particularly, to discharge pressure through selective circulation of the discharge flow rate according to whether or not work is performed so as to reduce pressure loss and heat generation due to the circulation of the hydraulic pump discharge flow rate. A hydraulic system of a forklift truck having improved pressure loss by simplifying a circulation path.

일반적으로 종래 지게차와 같은 산업용 차량의 유압 시스템에서, 유압펌프의 토출유량은 틸팅 제어밸브, 리프팅 제어밸브 등 유압 시스템 내부의 각 제어밸브반을 거쳐 유압탱크로 귀환하는 복잡한 경로구조를 갖고 있다.In general, in the hydraulic system of an industrial vehicle such as a conventional forklift, the discharge flow rate of the hydraulic pump has a complicated path structure for returning to the hydraulic tank through each control valve panel inside the hydraulic system, such as a tilting control valve, a lifting control valve.

도 1은 종래 지게차의 유압시스템에 관한 회로도이다. 도 1에 도시된 바와 같이, 종래 유압시스템은 서로 연결된 각종 제어밸브반(20,30,40,50,60)과, 각 제어밸브반(20,30,40,50,60)에 대해 토출유량을 제공하는 유압펌프(10) 및 각 제어밸브반(20,30,40,50,60)을 거쳐 토출유량이 최종 귀환하는 유압탱크(70)를 포함하여 구성되어 있다.1 is a circuit diagram of a conventional hydraulic system of a forklift truck. As shown in FIG. 1, the conventional hydraulic system has discharge flow rates for various control valve panels 20, 30, 40, 50, and 60, and control valve panels 20, 30, 40, 50, and 60 connected to each other. It is configured to include a hydraulic pump 10 for providing a final discharge flow through the hydraulic pump 10 and each control valve panel (20, 30, 40, 50, 60).

여기서 각 제어밸브반(20,30,40,50,60)은, 유압펌프(10)의 토출유량이 통과 하는 순서에 따라 배치/연결되어 있는 유입 제어밸브반(20), 리프팅 제어밸브반(30), 틸팅 제어밸브반(40), 제1보조 제어밸브반(50), 제2보조 제어밸브반(60) 등이다.Here, each control valve panel (20, 30, 40, 50, 60), the inlet control valve panel 20, the lifting control valve panel is arranged / connected in the order in which the discharge flow rate of the hydraulic pump 10 passes ( 30), the tilting control valve panel 40, the first auxiliary control valve panel 50, the second auxiliary control valve panel 60, and the like.

또한, 상기 리프팅 제어밸브반(30)에는 토출유량에 의해 캐리지의 리프팅 운동이 가능하도록 리프팅 실린더반(31)이 연결되어 있고, 틸팅 제어밸브반(40)에는 마스트의 틸팅 운동이 가능하도록 틸팅 실린더반(41)이 연결되어 있다.In addition, a lifting cylinder plate 31 is connected to the lifting control valve panel 30 so as to allow a lifting movement of the carriage by the discharge flow rate, and a tilting cylinder to allow the tilting movement of the mast to the tilting control valve panel 40. Van 41 is connected.

따라서, 이와 같은 구조의 종래 유압시스템에서 각 제어밸브반(20,30,40,50,60)은 마스트, 캐리지 등과 같은 작업수단들의 구동 조절을 위해 구비된 것으로, 작업 중에는 유압펌프의 토출유량이 유입 제어밸브반(20), 리프팅 제어밸브반(30), 틸팅 제어밸브반(40), 제1보조 제어밸브반(50) 및 제2보조 제어밸브반(60)을 거친 뒤 리턴 필터(71)를 통해 유압탱크(70)에 귀환되는 순환경로를 갖는다.Therefore, in the conventional hydraulic system having such a structure, each of the control valve panels 20, 30, 40, 50, and 60 is provided for driving control of work means such as a mast and a carriage. After the inflow control valve panel 20, the lifting control valve panel 30, the tilting control valve panel 40, the first auxiliary control valve panel 50 and the second auxiliary control valve panel 60, the return filter (71) It has a circulation path that is fed back to the hydraulic tank (70).

그런데, 종래 유압시스템은 작업이 멈춘 상태에서 지게차를 주행시킬 경우에도 각 제어밸브반(20,30,40,50,60)을 모두 거쳐 토출유량이 순환되고, 유압탱크(70)에 귀환되는 작동 구조를 갖고 있고, 특히 지게차의 엔진속도에 비례하여 유압펌프(10)가 동작되는 구조이므로 결국 엔진속도에 비례하는 토출유량이 각 제어밸브반(20,30,40,50,60)을 순환하게 된다. 결국, 종래의 유압시스템은 지게차가 주행할 경우에 작업여부와 관계없이 상시적으로 각 제어밸브반(20,30,40,50,60)을 통해 유압펌프(10)의 토출유량이 순환되는 구조이었다.However, in the conventional hydraulic system, even when the forklift is driven while the operation is stopped, the discharge flow rate is circulated through each of the control valve panels 20, 30, 40, 50 and 60, and the operation is returned to the hydraulic tank 70. In particular, since the hydraulic pump 10 is operated in proportion to the engine speed of the forklift, the discharge flow rate proportional to the engine speed circulates through each of the control valve panels 20, 30, 40, 50, and 60. do. As a result, the conventional hydraulic system has a structure in which the discharge flow rate of the hydraulic pump 10 is circulated through the control valve panels 20, 30, 40, 50 and 60 at all times regardless of whether the forklift is running. It was.

이에 따라 작업이 멈춘 상태에서도 만일 지게차가 주행할 경우, 토출유량의 순환이 반복되므로 이에 따른 유압 시스템 내부에서의 압력손실 및 발열이 발생하게 되는 문제점이 있다. 이러한 압력손실 및 발열은 유압시스템의 각 제어밸브반(20,30,40,50,60) 등과 같은 각 부품별 내구성 저하 및 엔진 과열을 초래하는 문제점을 발생시킨다.Accordingly, even when the operation is stopped, if the forklift runs, the circulation of the discharge flow rate is repeated, thereby causing a pressure loss and heat generation in the hydraulic system. Such pressure loss and heat generation cause problems such as deterioration of durability and engine overheating of each component such as the control valve panels 20, 30, 40, 50, and 60 of the hydraulic system.

더불어 작업 정지 상태에서의 토출유량의 순환은 지게차의 등판능력을 저하시킴은 물론, 지게차의 시동 성능의 저하를 초래하는 등의 문제점을 발생시키므로, 그러한 종래 지게차 유압시스템의 설계 개선이 시급한 실정이다.In addition, the circulation of the discharge flow rate in the working stop state not only lowers the climbing capacity of the forklift, but also causes problems such as deterioration of the starting performance of the forklift. Therefore, it is urgent to improve the design of such a conventional forklift hydraulic system.

따라서 본 발명은 상기와 같은 종래 문제점을 감안하여 안출된 것으로, 본 발명의 목적은, 각 제어밸브반에 대한 센싱구조 및 토출유량의 선택적 순환구조를 통해 작업 정지시 유압시스템의 토출유량 순환경로를 단순화시키는 압력손실을 개선한 지게차의 유압시스템을 제공하는 것이다.Accordingly, the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a discharge flow rate circulation path of a hydraulic system through a sensing structure for each control valve panel and a selective circulation structure of discharge flow rate. It is to provide a hydraulic system of a forklift truck with an improved pressure loss to simplify.

본 발명의 다른 목적은, 토출유량의 선택적 순환구조를 통해 작업자의 운전석 이탈 또는 주행 정지시 유압시스템의 토출유량 순환경로를 단순화시키는 압력손실을 개선한 지게차의 유압시스템을 제공하는 것이다.Another object of the present invention is to provide a hydraulic system of a forklift truck, which improves pressure loss, which simplifies the discharge flow rate circulation path of the hydraulic system when the operator leaves the driver's seat or stops driving through the selective circulation structure of the discharge flow rate.

전술한 목적을 달성하기 위해, 본 발명은 유량을 토출하는 유압펌프; 상기 유압펌프의 최상류 측 토출 유압라인과 드레인 유압라인 사이에 설치되며 릴리프밸브를 포함하는 유입 제어밸브반; 상기 릴리프밸브의 릴리프 압력을 조절하도록 상기 릴리프밸브의 일측 수압부에 설치된 솔레노이드 밸브; 상기 유입 제어밸브반의 하류측에 순차적으로 배치/연결되는 리프팅 제어밸브반, 틸팅 제어밸브반 및 다수의 보조 제어밸브반; 상기 리프팅 제어밸브반, 틸팅 제어밸브반 및 다수의 보조 제어밸브반의 스풀변위를 감지하도록 상기 각 제어밸브반에 설치되는 리프팅 스풀변위센서, 틸팅 스풀변위센서 및 각 보조 스풀변위센서; 및 상기 각 스풀변위센서의 감지신호에 기초해 결정되는 작업 정지에 따라 상기 유압펌프의 토출유량이 상기 드레인 유압라인으로 직송되도록 상기 솔레노이드 밸브의 작동을 제어하는 컨트롤 러;를 포함하여 구성되는 것을 특징으로 하는 압력손실을 개선한 지게차의 유압시스템을 제공한다.In order to achieve the above object, the present invention is a hydraulic pump for discharging the flow rate; An inflow control valve panel installed between an upstream discharge hydraulic line and a drain hydraulic line of the hydraulic pump and including a relief valve; A solenoid valve installed at one side pressure receiving portion of the relief valve to adjust the relief pressure of the relief valve; A lifting control valve panel, a tilting control valve panel, and a plurality of auxiliary control valve panels sequentially arranged / connected to the downstream side of the inflow control valve panel; A lifting spool displacement sensor, a tilting spool displacement sensor, and each auxiliary spool displacement sensor installed in each of the control valve panels to detect spool displacements of the lifting control valve panel, the tilting control valve panel, and the plurality of auxiliary control valve panels; And a controller for controlling the operation of the solenoid valve so that the discharge flow rate of the hydraulic pump is directly sent to the drain hydraulic line in accordance with the operation stop determined based on the detection signal of each spool displacement sensor. To provide a hydraulic system of the forklift to improve the pressure loss.

또한, 본 발명은 위의 본 발명의 일실시예에 대하여 다음의 구체적인 실시예들을 더 제공한다.In addition, the present invention further provides the following specific embodiments of the above-described embodiment of the present invention.

본 발명의 일실시예에 따르면, 본 발명에 따른 지게차의 유압시스템은 운전석 이탈 감지신호를 기초로 상기 유압펌프의 토출유량이 상기 드레인 유압라인에 직송되도록 상기 컨트롤러에 전기적으로 연결되는 시트 감지센서가 더 포함되는 것을 특징으로 한다.According to one embodiment of the invention, the hydraulic system of the forklift according to the present invention is a seat detection sensor electrically connected to the controller so that the discharge flow rate of the hydraulic pump is sent directly to the drain hydraulic line based on the driver's seat departure detection signal It is characterized in that it is further included.

본 발명의 일실시예에 따르면, 본 발명에 따른 지게차의 유압시스템은 주행 정지 감지신호를 기초로 상기 유압펌프의 토출유량이 상기 드레인 유압라인에 직송되도록 상기 컨트롤러에 전기적으로 연결되는 키-온 감지센서가 더 포함되는 것을 특징으로 한다.According to an embodiment of the present invention, the hydraulic system of the forklift according to the present invention is a key-on sensing electrically connected to the controller so that the discharge flow rate of the hydraulic pump is sent directly to the drain hydraulic line based on the driving stop detection signal A sensor is further included.

본 발명에 따른 압력손실을 개선한 지게차의 유압시스템에 의하면, 작업 정지상태에서의 주행시 토출유량의 순환구조를 단순화함으로써, 압력손실 및 발열을 저감시킬 수 있는 특징이 있다. 따라서 차량의 주행성능 및 유압시스템의 내구성 향상에 기여할 수 있는 효과가 있다.According to the hydraulic system of a forklift truck having improved pressure loss according to the present invention, the pressure loss and heat generation can be reduced by simplifying the circulation structure of the discharge flow rate when the vehicle is stopped in operation. Therefore, there is an effect that can contribute to improving the running performance of the vehicle and the durability of the hydraulic system.

본 발명의 그 밖의 목적, 특정한 장점들 및 신규한 특징들은 첨부된 도면들과 연관되어지는 이하의 상세한 설명과 바람직한 실시예들로부터 더욱 분명해질 것이다.Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

이하 본 발명에 따른 압력손실을 개선한 지게차의 유압시스템에 관하여 첨부된 도면과 더불어 설명하기로 한다.Hereinafter, the hydraulic system of the forklift having improved pressure loss will be described with reference to the accompanying drawings.

도 2는 본 발명에 따른 압력손실을 개선한 지게차의 유압시스템의 회로도이고, 도 3은 본 발명에 따른 압력손실을 개선한 지게차의 유압시스템의 전기회로 구성도이다. 도 2 및 도 3에 도시된 바와 같이, 본 발명에 따른 압력손실을 개선한 지게차의 유압시스템은, 작업수단(예를 들어 마스트, 캐리지 등)의 작업이 정지된 상태에서 지게차가 주행 중일 경우 또는 작업자가 운전석에서 이탈한 경우 또는 시동을 OFF시킬 경우를 감지하는 각 센서(300a,300b,400a,400b,500a,500b,600a,600b,910,920)가 탑재되어 유압시스템의 토출유량이 각 제어밸브반(300,400,500,600)을 순환하지 않고 곧바로 유압탱크(800)로 직송될 수 있는 구조를 갖고 있다.2 is a circuit diagram of a hydraulic system of a forklift truck having improved pressure loss according to the present invention, and FIG. 3 is a circuit diagram of a hydraulic system of a forklift truck having improved pressure loss according to the present invention. As shown in Figures 2 and 3, the hydraulic system of the forklift with improved pressure loss according to the present invention, when the forklift is running while the work of the work means (for example, mast, carriage, etc.) is stopped or Each sensor (300a, 300b, 400a, 400b, 500a, 500b, 600a, 600b, 910, 920) is installed to detect when an operator leaves the driver's seat or turn off the engine. It has a structure that can be sent directly to the hydraulic tank 800 without circulating (300,400,500,600).

이러한 본 발명에 따른 압력손실을 개선한 지게차의 유압시스템은, 유량을 토출하는 유압펌프(100), 상기 유압펌프(100)의 최상류 측 토출 유압라인과 드레인 유압라인(700) 사이에 설치되며 릴리프밸브(220)를 포함하는 유입 제어밸브반(200), 상기 릴리프밸브(220)의 릴리프 압력을 조절하도록 상기 릴리프밸브(220)의 일측 수압부에 설치된 솔레노이드 밸브(210), 상기 유입 제어밸브반(200)의 하류측에 순차적으로 배치/연결되는 리프팅 제어밸브반(300), 틸팅 제어밸브반(400) 및 다수의 보조 제어밸브반(500, 600), 상기 리프팅 제어밸브반(300), 틸팅 제어밸브반(400) 및 다수의 보조 제어밸브반(500, 600)의 스풀변위를 감지하도록 상기 각 제어밸브반에 설치되는 리프팅 스풀변위센서(300a, 300b), 틸팅 스풀변위센서(400a, 400b) 및 각 보조 스풀변위센서(500a, 500b, 600a, 600b) 및 상기 각 스풀변위센서(400a, 400b, 500a, 500b, 600a, 600b)의 감지신호에 기초해 결정되는 작업 정지에 따라 상기 유압펌프(100)의 토출유량이 상기 드레인 유압라인(700)으로 직송되도록 상기 솔레노이드 밸브(210)의 작동을 제어하는 컨트롤러(900) 등을 포함하여 구성된다.The hydraulic system of the forklift with improved pressure loss according to the present invention is installed between the hydraulic pump 100 for discharging the flow rate, the discharge hydraulic line and the drain hydraulic line 700 of the upstream side of the hydraulic pump 100 and relief Inlet control valve panel 200 including a valve 220, the solenoid valve 210 installed on one side of the hydraulic pressure portion of the relief valve 220 to adjust the relief pressure of the relief valve 220, the inlet control valve panel Lifting control valve panel 300, the tilting control valve panel 400 and a plurality of auxiliary control valve panel (500, 600), the lifting control valve panel 300, which are sequentially arranged / connected to the downstream side of the 200, Lifting spool displacement sensor (300a, 300b), tilting spool displacement sensor (400a,) installed in each of the control valve panel to detect the spool displacement of the tilting control valve panel 400 and a plurality of auxiliary control valve panels (500, 600) 400b) and each auxiliary spool displacement sensor (500a, 500b, 600a, 600b) and The discharge flow rate of the hydraulic pump 100 is transferred directly to the drain hydraulic line 700 according to the operation stop determined based on the detection signals of the respective spool displacement sensors 400a, 400b, 500a, 500b, 600a, and 600b. It is configured to include a controller 900 and the like for controlling the operation of the solenoid valve 210.

여기서 각 제어밸브반(300,400,500,600)은 리프팅 제어밸브반(300), 틸팅 제어밸브반(400) 및 제1보조 제어밸브반(500), 제2보조제어밸브반(600)으로, 마스트, 캐리지, 어태치먼트 등과 같은 작업 수단을 조절하기 위해 구비된 것이다.Here, each control valve panel 300, 400, 500, 600 is a lifting control valve panel 300, the tilting control valve panel 400 and the first auxiliary control valve panel 500, the second auxiliary control valve panel 600, mast, carriage, It is provided for adjusting work means such as attachments.

또한, 상기 리프팅 제어밸브반(300)에는 리프팅 제어밸브반(300)의 조절을 통해 토출유량의 유압력으로 리프팅 운동이 가능하도록 리프팅 실린더반(310)이 연결되어 있다. 그리고, 틸팅 제어밸브반(400)에는 틸팅 제어밸브반(400)의 조절을 통해 토출유량의 유압력으로 틸팅 운동이 가능하도록 틸팅 실린더반(410)이 연결되어 있다.In addition, the lifting control valve panel 300 is connected to the lifting cylinder panel 310 to enable the lifting movement by the hydraulic force of the discharge flow rate through the control of the lifting control valve panel (300). In addition, the tilting control valve panel 400 is connected to the tilting cylinder panel 410 such that the tilting movement is possible by the hydraulic force of the discharge flow rate through the adjustment of the tilting control valve panel 400.

이러한 각 제어밸브반(300,400,500,600) 더불어 유압펌프(100)의 최초 토출유량이 제공되도록 유압펌프(100)에 연결되는 유입 제어밸브반(200)이 구비되는바, 유입 제어밸브반(200)에는 솔레노이드 밸브(210)가 구비되어 솔레노이드 밸브(210)의 개폐여부에 따라 토출유량이 각 제어밸브반(300,400,500,600)에 제공된다.Each of the control valve panel 300, 400, 500, 600, in addition to the inlet control valve panel 200 is connected to the hydraulic pump 100 so that the first discharge flow rate of the hydraulic pump 100 is provided, the inlet control valve panel 200 is a solenoid The valve 210 is provided so that the discharge flow rate is provided to each control valve panel 300, 400, 500, 600 according to whether the solenoid valve 210 is opened or closed.

또한, 상기 각 제어밸브반(300,400,500,600)에는 전기적으로 연결된 변위감지센서(300a,300b,400a,400b,500a,500b,600a,600b)가 구비되어 있다. 상기 리프팅 제어밸브반(300)에는 제1리프팅 번위센서(300a) 및 제2리프팅 변위센서(300b)가 연결되어 있고, 상기 틸팅 제어밸브반(400)에는 제1틸팅 변위센서(400a) 및 제2틸팅 변위센서(400b)가 연결되어 있다. 또한, 상기 제1보조 제어밸브반(500)에는 제1보조 제1변위센서(500a) 및 제1보조 제2변위센서(500b)가 연결되어 있고, 상기 제2보조 제어밸브반(600)에는 제2보조 제1보조변위센서(600a) 및 제2보조 제1변위센서(600b)가 연결되어 있다.In addition, each of the control valve panel 300, 400, 500, 600 is provided with a displacement detection sensor (300a, 300b, 400a, 400b, 500a, 500b, 600a, 600b) electrically connected. The first lifting position sensor 300a and the second lifting displacement sensor 300b are connected to the lifting control valve panel 300, and the first tilting displacement sensor 400a and the first lifting displacement sensor 300a are connected to the lifting control valve panel 300. 2 The tilting displacement sensor 400b is connected. In addition, a first auxiliary first displacement sensor 500a and a first auxiliary second displacement sensor 500b are connected to the first auxiliary control valve panel 500, and the second auxiliary control valve panel 600 is connected to the first auxiliary control valve panel 500. The second auxiliary first auxiliary displacement sensor 600a and the second auxiliary first displacement sensor 600b are connected to each other.

이러한 각 변위센서(300a,300b,400a,400b,500a,500b,600a,600b)는 각 제어밸브반(300,400,500,600)에서의 스풀변위를 감지하고 이를 기초로 각 제어밸브반에서 담당하는 작업수단들의 작동여부를 감지하기 위해서 구비된 것이다. 이러한 각 변위센서(300a,300b,400a,400b,500a,500b,600a,600b)가 전기적으로 연결된 것이 컨트롤러(900)이다.Each of the displacement sensors 300a, 300b, 400a, 400b, 500a, 500b, 600a, and 600b detects the spool displacement in each of the control valve panels 300, 400, 500, and 600, and based on the operation of the work means in charge of each control valve panel. It is provided to detect whether or not. Each of the displacement sensors 300a, 300b, 400a, 400b, 500a, 500b, 600a, and 600b is electrically connected to the controller 900.

상기 컨트롤러(900)는 각 변위센서(300a,300b,400a,400b,500a,500b,600a,600b)의 감지신호를 기초로 작업수단들의 작동 중지를 결정한다. 그런 다음, 상기 유입 제어밸브반(200)의 솔레노이드 밸브(210)를 조절하여 유압펌프(100)로부터 유입 제어밸브반(200)로 제공되는 토출유량이 각 제어밸브반(300,400,500.600)으로 제공되지 않고 곧바로 유압탱크(800)로 귀환시킬 수 있도록 각 변위센서(300a,300b,400a,400b,500a,500b,600a,600b) 및 솔레노이드 밸브(210)에 전기적으로 연결되어 있는 구조를 갖는다.The controller 900 determines to stop operation of the working means based on the detection signals of the displacement sensors 300a, 300b, 400a, 400b, 500a, 500b, 600a, and 600b. Then, by adjusting the solenoid valve 210 of the inlet control valve panel 200, the discharge flow rate provided from the hydraulic pump 100 to the inlet control valve panel 200 is not provided to each control valve panel (300, 400, 500.600) It has a structure that is electrically connected to each of the displacement sensors (300a, 300b, 400a, 400b, 500a, 500b, 600a, 600b) and the solenoid valve 210 to be immediately returned to the hydraulic tank (800).

또한, 상기 유입 제어밸브반(200)을 포함하여 각 제어밸브반(200,300,400,500,600)에는 드레인 유압라인(700)이 연결되어 있는바, 이러한 드 레인 유압라인(700)은 유압탱크(800) 및 유압탱크(800)의 입구에 설치된 리턴 밸브(810)에 연결되어 컨트롤러(900)의 제어에 의해 토출유량이 드레인 유압라인(700)에 유입될 경우 곧바로 리턴 밸브(810)를 거쳐 유압탱크(800)로 직송될 수 있는 구조가 마련된다.In addition, each of the control valve panels 200, 300, 400, 500, and 600, including the inflow control valve panel 200, is connected to the drain hydraulic line 700, the drain hydraulic line 700 is a hydraulic tank 800 and the hydraulic tank Connected to the return valve 810 installed at the inlet of the 800, when the discharge flow rate flows into the drain hydraulic line 700 under the control of the controller 900 immediately through the return valve 810 to the hydraulic tank 800 A structure that can be sent directly is provided.

이와 같이 컨트롤러(900)에는 작업수단의 작업여부 및 주행여부 등의 감지를 위해 변위센서(300a,300b,400a,400b,500a,500b,600a,600b)가 연결되어 있는데, 이와 함께 지게차 작업자의 운전석 이탈을 감지하기 위한 시트 감지센서(810) 및 시동의 ON/OFF를 감지하기 위한 키-온 감지센서(820)가 전기적으로 연결되어 있다.In this way, the controller 900 is connected to the displacement sensor (300a, 300b, 400a, 400b, 500a, 500b, 600a, 600b) for detecting whether the working means work or running, such as the driver's seat of the forklift worker The seat sensor 810 for detecting the departure and the key-on sensor 820 for detecting the ON / OFF of the start is electrically connected.

이에 따라 만일 작업자가 운적석을 이탈하여 시트 감지센서(910)의 감지신호를 송출받을 경우, 앞에서 언급된 솔레노이드 밸브(210)를 조작하여 토출유량이 바로 유압탱크(800)에 직송되도록 할 수 있다. 또한 시동이 OFF될 경우 키-온 감지센서(920)의 감지신호를 송출받아 토출유량이 바로 유압탱크(800)에 직송되도록 할 수 있다. Accordingly, if the operator leaves the cumulus stone and receives the detection signal of the seat detection sensor 910, the above-mentioned solenoid valve 210 may be operated to allow the discharge flow rate to be directly sent to the hydraulic tank 800. . In addition, when the start is OFF, the discharge signal may be sent directly to the hydraulic tank 800 by receiving the detection signal of the key-on sensor 920.

따라서, 각 변위센서(300a,300b,400a,400b,500a,500b,600a,600b), 시트 감지센서(910) 및 키-온 감지센서(920)의 감지신호가 컨트롤러(900)에 송출될 경우 작업수단의 작업정지, 작업자의 이석, 주행정지 등을 인식하고, 이를 기초로 유압펌프(100)의 토출유량이 각 제어밸브반(300,400,500,600)으로 제공되지 않고, 드레인 유압라인(700)을 통해 유압탱크(800)로 방출할 수 있는 구조가 마련된다.Accordingly, when the detection signals of the displacement sensors 300a, 300b, 400a, 400b, 500a, 500b, 600a, and 600b, the seat detection sensor 910, and the key-on detection sensor 920 are transmitted to the controller 900, respectively. Recognizing work stop of working means, operator's seat, driving stop, etc., and based on this, the discharge flow rate of the hydraulic pump 100 is not provided to each control valve panel 300, 400, 500, 600, and the hydraulic pressure is discharged through the drain hydraulic line 700. A structure capable of discharging to the tank 800 is provided.

비록 본 발명이 상기 언급된 바람직한 실시예와 관련하여 설명되어졌지만, 발명의 요지와 범위로부터 벗어남이 없이 다양한 수정이나 변형을 하는 것이 가능 하다. 따라서 첨부된 특허청구의 범위는 본 발명의 요지에서 속하는 이러한 수정이나 변형을 포함할 것이다.Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

도 1은 종래 지게차의 유압시스템에 관한 회로도,1 is a circuit diagram of a conventional hydraulic system of a forklift truck;

도 2는 본 발명에 따른 압력손실을 개선한 지게차의 유압시스템의 회로도, 2 is a circuit diagram of a hydraulic system of a forklift truck having improved pressure loss according to the present invention;

도 3은 본 발명에 따른 압력손실을 개선한 지게차의 유압시스템의 전기회로 구성도이다. 3 is a configuration diagram of an electric circuit of a hydraulic system of a forklift truck having improved pressure loss according to the present invention.

< 도면의 주요부분에 관한 부호의 설명 >        <Description of the code | symbol about the principal part of drawing>

10 : 유압펌프, 20 : 유입 제어밸브반, 10: hydraulic pump, 20: inlet control valve panel,

30 : 리프팅 제어밸브반, 31 : 리프팅 실린더반, 30: lifting control valve plate, 31: lifting cylinder plate,

40 : 틸팅 제어밸브반, 41 : 틸팅 실린더반, 40: tilting control valve panel, 41: tilting cylinder panel,

50 : 제1보조 제어밸브반, 60 : 제2보조 제어밸브반, 50: first auxiliary control valve panel, 60: second auxiliary control valve panel,

70 : 유압탱크, 71 : 리턴필터, 70: hydraulic tank, 71: return filter,

100 : 유압펌프, 200 : 유입 제어밸브반,100: hydraulic pump, 200: inlet control valve panel,

210 : 솔레노이드 밸브, 300 : 리프팅 제어밸브반,210: solenoid valve, 300: lifting control valve panel,

310 : 리프팅 실린더반, 300a : 제1리프팅 변위센서,310: lifting cylinder plate, 300a: first lifting displacement sensor,

300b : 제2리프팅 변위센서, 400 : 틸팅 제어밸브반,300b: second lifting displacement sensor, 400: tilting control valve panel,

410 : 틸팅 실린더반, 400a : 제1틸팅 변위센서,410: tilting cylinder board, 400a: the first tilting displacement sensor,

400b : 제2틸팅 변위센서, 500 : 제1보조 제어밸브반,400b: second tilting displacement sensor, 500: first auxiliary control valve panel,

500a : 제1보조 제1변위센서, 500b : 제1보조 제1변위센서,500a: first auxiliary first displacement sensor, 500b: first auxiliary first displacement sensor,

600 : 제2보조 제어밸브반, 600a : 제2보조 제1변위센서,600: second auxiliary control valve panel, 600a: second auxiliary first displacement sensor,

600b : 제2보조 제2변위센서, 700 : 드레인 유압라인,600b: second secondary displacement sensor, 700: drain hydraulic line,

800 : 유압탱크, 810 : 리턴 필터,800: hydraulic tank, 810: return filter,

900 : 컨트롤러, 910 : 시트 감지센서,900: controller, 910: seat detection sensor,

920 : 키-온 감지센서.920: key-on sensor.

Claims (3)

유량을 토출하는 유압펌프(100);A hydraulic pump 100 for discharging the flow rate; 상기 유압펌프(100)의 최상류 측 토출 유압라인과 드레인 유압라인(700) 사이에 설치되며 릴리프밸브(220)를 포함하는 유입 제어밸브반(200);An inflow control valve panel (200) installed between the upstream side discharge hydraulic line and the drain hydraulic line (700) of the hydraulic pump (100) and including a relief valve (220); 상기 릴리프밸브(220)의 릴리프 압력을 조절하도록 상기 릴리프밸브(220)의 일측 수압부에 설치된 솔레노이드 밸브(210);A solenoid valve 210 installed at one side pressure receiving portion of the relief valve 220 to adjust the relief pressure of the relief valve 220; 상기 유입 제어밸브반(200)의 하류측에 순차적으로 배치/연결되는 리프팅 제어밸브반(300), 틸팅 제어밸브반(400) 및 다수의 보조 제어밸브반(500, 600);A lifting control valve panel 300, a tilting control valve panel 400, and a plurality of auxiliary control valve panels 500 and 600 sequentially arranged / connected to the downstream side of the inflow control valve panel 200; 상기 리프팅 제어밸브반(300), 틸팅 제어밸브반(400) 및 다수의 보조 제어밸브반(500, 600)의 스풀변위를 감지하도록 상기 각 제어밸브반에 설치되는 리프팅 스풀변위센서(300a, 300b), 틸팅 스풀변위센서(400a, 400b) 및 각 보조 스풀변위센서(500a, 500b, 600a, 600b); 및Lifting spool displacement sensor (300a, 300b) installed in each of the control valve panel to detect the spool displacement of the lifting control valve panel 300, the tilting control valve panel 400 and a plurality of auxiliary control valve panels (500, 600) ), The tilting spool displacement sensors 400a and 400b and the respective auxiliary spool displacement sensors 500a, 500b, 600a and 600b; And 상기 각 스풀변위센서(400a, 400b, 500a, 500b, 600a, 600b)의 감지신호에 기초해 결정되는 작업 정지에 따라 상기 유압펌프(100)의 토출유량이 상기 드레인 유압라인(700)으로 직송되도록 상기 솔레노이드 밸브(210)의 작동을 제어하는 컨트롤러(900);를 포함하여 구성되는 것을 특징으로 하는 압력손실을 개선한 지게차의 유압시스템. The discharge flow rate of the hydraulic pump 100 is transferred directly to the drain hydraulic line 700 according to the operation stop determined based on the detection signals of the respective spool displacement sensors 400a, 400b, 500a, 500b, 600a, and 600b. And a controller (900) for controlling the operation of the solenoid valve (210). 제1항에 있어서, 운전석 이탈 감지신호를 기초로 상기 유압펌프의 토출유량 이 상기 드레인 유압라인(700)에 직송되도록 상기 컨트롤러(900)에 전기적으로 연결되는 시트 감지센서(910)가 더 포함되는 것을 특징으로 하는 압력손실을 개선한 지게차의 유압시스템.The seat detection sensor 910 of claim 1, further comprising a seat detection sensor 910 electrically connected to the controller 900 such that the discharge flow rate of the hydraulic pump is directly transmitted to the drain hydraulic line 700 based on the driver's seat detection signal. Hydraulic system of the forklift with improved pressure loss. 제1항에 있어서, 주행 정지 감지신호를 기초로 상기 유압펌프(100)의 토출유량이 상기 드레인 유압라인(700)에 직송되도록 상기 컨트롤러(900)에 전기적으로 연결되는 키-온 감지센서(920)가 더 포함되는 것을 특징으로 하는 압력손실을 개선한 지게차의 유압시스템.The key-on sensor 920 of claim 1, wherein the discharge flow rate of the hydraulic pump 100 is directly connected to the controller 900 so that the discharge flow rate of the hydraulic pump 100 is directly transmitted to the drain hydraulic line 700. Hydraulic system of the forklift, the pressure loss is improved, characterized in that it further comprises.
KR1020070137078A 2007-12-26 2007-12-26 Oil Pressure System of Forklift for improving Pressure Reduction KR101437167B1 (en)

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