JPS6051301U

JPS6051301U - Lifting device hydraulic circuit

Info

Publication number: JPS6051301U
Application number: JP14346083U
Authority: JP
Inventors: 林　喜興志; 水戸　昭夫; 坂本　速雄
Original assignee: 株式会社トキメック
Priority date: 1983-09-16
Filing date: 1983-09-16
Publication date: 1985-04-11
Also published as: JPH0419204Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来回路を示した液圧回路図、第２図は本考案
の一実施例を示した液圧回路図、第３図は第２図の実施
例で用いる双方向コンベンセータ弁ρ構造説明図、第４
図は第２図の実施例で用いるディジタル方向流量制御弁
の構造説明図である。１：昇降用液圧シリンダ、１ａ：上昇用液室、１ｂ：下
降用液室、４：パイロット付チェック　′弁、７：液圧
源、８：タンク、１０：双方向コンペンセータ弁、１２
：ディジタル方向流量制御弁、１３，２５：本体、１４
，２６：スプール、１５ａ、１５ｂ、４０ａ〜４０ｇ：
大径部、１６ａ、１６ｂ、４１ａ〜４１ｄ：切欠、１７
ａ、１７ｂ：パイロット室、１８ａ、１８ｂニスプリン
グ、２１：パルスモータ、２７．２８：パイロットスプ
ール、２９ａ＊２９ｂ”リターンスプリング、３０：内
部流路、３１：ノズル、３２：ロータリフラッパ、３３
：ベアリング、３４：偏心軸、３７：オリフィス部材、
３８ニスプール室。Fig. 1 is a hydraulic circuit diagram showing a conventional circuit, Fig. 2 is a hydraulic circuit diagram showing an embodiment of the present invention, and Fig. 3 is a bidirectional convencator valve ρ structure used in the embodiment of Fig. 2. Explanatory diagram, 4th
The figure is a structural explanatory diagram of the digital directional flow control valve used in the embodiment of FIG. 2. 1: Lifting hydraulic cylinder, 1a: Lifting liquid chamber, 1b: Descending liquid chamber, 4: Check valve with pilot, 7: Hydraulic pressure source, 8: Tank, 10: Bidirectional compensator valve, 12
:Digital directional flow control valve, 13, 25: Main body, 14
, 26: Spool, 15a, 15b, 40a-40g:
Large diameter portion, 16a, 16b, 41a-41d: Notch, 17
a, 17b: Pilot chamber, 18a, 18b spring, 21: Pulse motor, 27.28: Pilot spool, 29a * 29b" return spring, 30: Internal flow path, 31: Nozzle, 32: Rotary flapper, 33
: Bearing, 34: Eccentric shaft, 37: Orifice member,
38 Nispur room.

Claims

[Scope of utility model registration request]

A lifting hydraulic cylinder for driving a load up and down, a pump port connected to a hydraulic pressure source, a tank port connected to a tank, a first pilot port connected to a hydraulic pressure source, and a lifting cylinder for lifting the lifting cylinder. It includes a rising port connected to the liquid chamber, a descending port connected to the descending liquid chamber of the lifting hydraulic cylinder, and a second pilot port, and is connected to the pump port by movement of the spool by a pulse motor. Ascending port, tank port and descending port, and the first
A first position that communicates the pilot port and the second pilot port, a neutral position that separates all the ports, a pump port and the descending port, a tank port and the ascending port, and a tank port and the second The pilot port is switched to a second position communicating with the pilot port, and the flow rate of the other channels other than the pilot channel formed by switching to the first or second position is throttled and adjusted according to the amount of movement of the spool. A digital direction flow control valve, a rising port of the digital direction flow control valve, and a rising liquid chamber of the lifting hydraulic pressure cylinder, and configured to control the hydraulic pressure of the rising port and the second pilot port. Each pilot pressure is introduced into a pilot liquid chamber equipped with springs on both sides of the spool, and the differential pressure generated by the restriction of the flow path formed by switching the digital directional control valve to the first or second position is kept constant. A hydraulic circuit for an elevating device, characterized in that the hydraulic circuit is provided with a two-way compensator valve that controls the flow rate in and out of the elevating hydraulic cylinder by movement of the spool so as to maintain the flow rate in and out of the elevating hydraulic cylinder.