JPS6420503U

JPS6420503U -

Info

Publication number: JPS6420503U
Application number: JP11602987U
Authority: JP
Priority date: 1987-07-29
Filing date: 1987-07-29
Publication date: 1989-02-01
Anticipated expiration: 2002-07-29
Also published as: JPH064081Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す流体制御装置
の回路図、第２図は本考案の流体制御装置に用い
た開閉手段の縦断面図、第３図は従来例を示す流
体制御装置の回路図である。１９…流体シリンダ、２０…第１弁体、２１…
第２弁体、２２…第３弁体、２３…第４弁体、２
７，３４…パイロツト切換弁、３０，３１，３７
，３８…作用室、１２，４８…カウンタバランス
弁、４９…開閉手段。 Fig. 1 is a circuit diagram of a fluid control device showing an embodiment of the present invention, Fig. 2 is a vertical sectional view of the opening/closing means used in the fluid control device of the present invention, and Fig. 3 is a fluid control device showing a conventional example. FIG. 19...Fluid cylinder, 20...First valve body, 21...
Second valve body, 22...Third valve body, 23...Fourth valve body, 2
7, 34...Pilot switching valve, 30, 31, 37
, 38...action chamber, 12, 48...counter balance valve, 49...opening/closing means.

Claims

[Scope of utility model registration request]

a first valve body that cuts off communication between a supply flow path for supplying pressure fluid and a first load flow path connected to a first cylinder chamber whose volume increases as the heavy load is lowered in a fluid cylinder that lifts and lowers a heavy load; a second valve body that blocks communication between the flow path and a second load flow path connected to a second cylinder chamber whose volume decreases due to the descent of a heavy object in the fluid cylinder; and a discharge connected to the first load flow path and the low pressure side. A third valve body that cuts off communication between the flow paths, a fourth valve body that cuts off communication between the second load flow path and the discharge flow path, and a third valve body that cuts off communication between the second load flow path and the discharge flow path, and a third valve body that supplies pilot fluid to the action chamber formed on the back of each valve body. A pilot switching valve that discharges the fluid in the chamber to the low pressure side, a check valve that communicates between the second load flow path and the working chamber on the back of the second valve body, and allows fluid to flow toward the working chamber side, and a throttle means. a flow path arranged in series;
A counterbalance valve is disposed in a pilot flow path that communicates between the working chamber on the back of the second valve body and the pilot switching valve to maintain fluid pressure in the working chamber on the back of the second valve body, and a counterbalance valve is installed in the pilot flow path to maintain the fluid pressure in the working chamber on the back of the second valve body. An opening/closing means is provided in parallel with the valve to allow or block fluid flow between the working chamber at the back of the second valve body and the pilot switching valve, and the opening/closing means opens and closes the first valve body by operating the pilot switching valve. The second valve body communicates with the third valve body.
When the valve body and the fourth valve body are shut off and the fluid cylinder lowers the heavy object through the differential circuit, the fluid in the working chamber on the back of the second valve body is prevented from flowing out to the pilot switching valve side, When the first valve body and the fourth valve body operate in isolation, the second valve body and the third valve body operate in communication, and the fluid cylinder lifts a heavy object, the fluid in the working chamber on the back of the second valve body is transferred to the pilot switching valve. A fluid control device operated by a pilot fluid to flow to the side.