The present invention relates to a high place work vehicle and, more specifically, relates to an apparatus to assist the lead-in of a boom for a high place work vehicle, capable of making an initial lead-in operation smooth by increasing initial lead-in force of a boom of a high place work vehicle while the boom is out. According to the present invention, a boom lead-in apparatus for a high place work vehicle, which enables a boom hydraulic pump (12) to supply hydraulic oil of a boom hydraulic tank (13) to a boom hydraulic cylinder (30) through a boom hydraulic operation valve (11), includes a pressure increasing circuit (40) receiving hydraulic oil from the boom hydraulic pump (12) and supplying hydraulic oil with increased pressure to a boom cylinder rod (32) of the boom hydraulic cylinder (30). The pressure increasing circuit (40) includes: a pressure increasing valve (60) receiving hydraulic oil from the boom hydraulic pump (12); and a pressure increasing cylinder (50) receiving the hydraulic oil supplied from the pressure increasing valve (60) through a pressure increasing head (51) while supplying hydraulic oil of a pressure increasing rod (52) to the boom cylinder rod (32) of the boom hydraulic cylinder (30). The cross-sectional area of the pressure increasing head (51) is larger than the cross-sectional area of the pressure increasing rod (52), and hydraulic pressure applied to the pressure increasing rod (52) is greater than the hydraulic pressure applied to the pressure increasing head (51).

    본 발명은 고소작업차에 관한 것으로, 보다 상세하게는 고소작업차의 붐이 인출되어 있는 상태에서 초기 붐의 인입력을 증강시킴으로써 초기 인입 작동이 원활하게 이루어지도록 마련되는 고소작업차의 붐 인입 보조장치에 관한 것이다. 이와 같은 본 발명의 특징은 붐유압펌프(12)에 의하여 붐유압탱크(13)의 유압유가 붐유압작동밸브(11)를 통해 붐유압실린더(30)로 공급되는 고소작업장비의 붐 인입장치에 있어서, 상기 붐유압펌프(12)로부터 유압유를 공급받아 붐유압실린더(30)의 붐실린더로드측(32)으로 증압된 유압유를 공급하는 증압회로(40)를 구비하며, 상기 증압회로(40)는, 붐유압펌프(12)로부터 유압유를 공급받는 증압밸브(60); 및 상기 증압밸브(60)로부터 공급되는 유압유를 증압헤드측(51)으로 공급받으면서 증압로드측(52)의 유압유를 붐유압실린더(30)의 붐실린더로드측(32)으로 공급하는 증압실린더(50)를 포함하며, 증압헤드측(51)의 헤드 단면적이, 증압로드측(52)의 로드 단면적보다 넓은 면적으로 이루어지고 증압헤드측(51)에 가해지는 유압력보다 증압로드측(52)에서의 유압력이 증압되는 것을 특징으로 한다.


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    Title :

    INCOMING AUXILIARY APPARATUS FOR HIGH PLACE WORKING VEHICLE


    Additional title:

    고소작업차의 붐 인입 보조장치


    Contributors:

    Publication date :

    2019-05-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    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 , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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