KR970016175A

KR970016175A - Hydration prevention device of hydraulic cylinder

Info

Publication number: KR970016175A
Application number: KR1019950029674A
Authority: KR
Inventors: 오승현
Original assignee: 석진철; 대우중공업 주식회사
Priority date: 1995-09-12
Filing date: 1995-09-12
Publication date: 1997-04-28

Abstract

본 발명은 중장비등에 사용되는 유압실린더가 자중이나 하중에 의해 저절로 아래로 내려오게 되는 현상을 방지하는 침하방지장치에 관한 것으로, 유압실린더(5)와 유압펌프(1) 사이에 압유의 흐름을 제어밸브(2)가 설치되고, 상기 제어밸브(2)가 피일롯압에 의해 절환작동되어지도록 된 유압실린더 제어장치에서, 상기 유압실린더(5)와 제어밸브(2) 사이에 포펫밸브(9)가 설치되고, 상기 포펫밸브(9)와 방향제어밸브(10)가 파일롯라인(11)을 통해 연결되면서 그 절환상태에 따라 상기 포펫밸브(9)의 후단을 차단시키거나 파일롯라인(11)을 오일탱크(12)와 연통시키게 되며, 상기 제어밸브(2)를 절환작동시키는 하강용 파일롯라인(9)이 상기 방향제어밸브(10)의 스푸울과 병렬연결되어 있는 한편, 상기 유압실린더(5)의 대구경실(5a)과 포펫밸브(9)사이에 감압밸브(13)와 콕크밸브(15) 및 첵크밸브(14)가 병렬연결되고, 상기 감압밸브(13)와 콕크밸브(15) 및 첵크밸브(14)가 오일탱크(12)와 연결된 구조로 이루어져 있는 것이다.The present invention relates to a sink prevention device that prevents the hydraulic cylinder used for heavy equipment, such as to fall down by itself due to its own weight or load, and controls the flow of pressure oil between the hydraulic cylinder (5) and the hydraulic pump (1) In the hydraulic cylinder control device in which the valve 2 is installed and the control valve 2 is switched by the pilot pressure, a poppet valve 9 is provided between the hydraulic cylinder 5 and the control valve 2. Is installed, the poppet valve (9) and the direction control valve 10 is connected through the pilot line 11 while blocking the rear end of the poppet valve (9) or oil the pilot line (11) according to the switching state In communication with the tank 12, the descending pilot line 9 for switching the control valve 2 is connected in parallel with the spool of the directional control valve 10, the hydraulic cylinder (5) Pressure reducing valve (13) between large diameter chamber (5a) and poppet valve (9) Cock valve 15 and check valve 14 is connected in parallel, the pressure reducing valve 13 and the cock valve 15 and check valve 14 is constructed in a structure that is connected to the oil tank (12).

Description

Hydration prevention device of hydraulic cylinder

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 따른 유압실린더의 침하방지장치를 구성하는 유압회로도.1 is a hydraulic circuit diagram constituting the settlement prevention device of the hydraulic cylinder according to the present invention.

Claims

A control valve 2 is installed between the hydraulic cylinder 5 and the hydraulic pump 1 to control the flow of the pressurized oil supplied to the hydraulic cylinder 5, and the control valve 2 is switched by the pilot pressure. In the hydraulic cylinder control device, a poppet valve (9) is provided between the large-diameter chamber (5a) and the control valve (2) of the hydraulic cylinder (5), and the poppet valve (9) and the direction control valve ( 10 is connected through the pilot line 11 to block the rear end of the poppet valve 9 or to communicate the pilot line 11 with the oil tank 12 according to the switching state. The lowering pilot line (7) for switching operation (2), the sinking prevention device of the hydraulic cylinder, characterized in that connected in parallel with the sprue of the direction control valve (10).

The pressure reducing valve (13), the check valve (15) and the check valve (14) are connected in parallel between the large diameter chamber (5a) and the poppet valve (9) of the hydraulic cylinder (5). The lowering device of the hydraulic cylinder, characterized in that the valve 13, the cock valve 15 and the check valve 14 is made of a structure connected to the oil tank (12).

※ Note: The disclosure is based on the initial application.