JPH0426700U - - Google Patents
Info
- Publication number
- JPH0426700U JPH0426700U JP6681390U JP6681390U JPH0426700U JP H0426700 U JPH0426700 U JP H0426700U JP 6681390 U JP6681390 U JP 6681390U JP 6681390 U JP6681390 U JP 6681390U JP H0426700 U JPH0426700 U JP H0426700U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- relief valve
- protector
- press
- spool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001012 protector Effects 0.000 claims description 9
- 230000036316 preload Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Fluid-Pressure Circuits (AREA)
- Control Of Presses (AREA)
- Safety Valves (AREA)
Description
第１図はこの考案の一実施例になるオーバロー
ド保護回路の回路図、第２図はプロテクタバルブ
の断面図、第３図は第２図方向からの矢視図、
第４図は第２図方向からの矢視図、第５図は作
用説明図、第６図は従来のオーバロード保護回路
の説明図である。
２はスライド、４はプロテクタシリンダ、８は
プロテクタバルブ、８ａは弁本体、８ｃはシリン
ダポート、８ｄはタンクポート、９は主リリーフ
弁、９ａはスプール、１０は補助リリーフ弁、１
０ａはスプール。
Fig. 1 is a circuit diagram of an overload protection circuit which is an embodiment of this invention, Fig. 2 is a sectional view of the protector valve, Fig. 3 is a view taken from the direction of Fig. 2,
4 is a view taken from the direction of FIG. 2, FIG. 5 is an explanatory diagram of the operation, and FIG. 6 is an explanatory diagram of a conventional overload protection circuit. 2 is a slide, 4 is a protector cylinder, 8 is a protector valve, 8a is a valve body, 8c is a cylinder port, 8d is a tank port, 9 is a main relief valve, 9a is a spool, 10 is an auxiliary relief valve, 1
0a is spool.
Claims (1)
とプロテクタバルブ８を接続して、プレス作業時
スライド２に加わる過負荷により発生する油圧を
、上記プロテクタバルブ８を介して逃すことによ
り過負荷を回避するようにしたプレスのオーバロ
ード保護回路において、上記プロテクタバルブ８
を主リリーフ弁９と補助リリーフ弁１０より構成
し、かつ各リリーフ弁９，１０のスプール９ａ，
１０ａを弁本体８ａ内に移動自在に収容して、主
リリーフ弁９のスプール９ａにプリロード圧を付
加することにより、上記プロテクタシリンダ４に
接続されたシリンダポート８ｃとタンクポート８
ｄの間を遮断すると共に、上記シリンダポート８
ｃより導入パイロツト圧により補助リリーフ弁１
０のスプール１０ａを動作させることにより、主
リリーフ弁９のスプール９ａに作用するプリロー
ド圧をドレンさせてなるプレスのオーバロード保
護回路用プロテクタバルブ。 Protector cylinder 4 provided on slide 2
In a press overload protection circuit, a press overload protection circuit is configured to connect a protector valve 8 to a press and release hydraulic pressure generated due to an overload applied to the slide 2 during press work through the protector valve 8 to avoid overload. Above protector valve 8
is composed of a main relief valve 9 and an auxiliary relief valve 10, and each relief valve 9, 10 has a spool 9a,
10a is movably accommodated in the valve body 8a and by applying preload pressure to the spool 9a of the main relief valve 9, the cylinder port 8c and tank port 8 connected to the protector cylinder 4 are
d, and the cylinder port 8
Auxiliary relief valve 1 is activated by pilot pressure introduced from c.
A protector valve for an overload protection circuit of a press, which drains the preload pressure acting on the spool 9a of the main relief valve 9 by operating the spool 10a of the main relief valve 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6681390U JPH0426700U (en) | 1990-06-26 | 1990-06-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6681390U JPH0426700U (en) | 1990-06-26 | 1990-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0426700U true JPH0426700U (en) | 1992-03-03 |
Family
ID=31599849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6681390U Pending JPH0426700U (en) | 1990-06-26 | 1990-06-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0426700U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11230200A (en) * | 1998-02-20 | 1999-08-27 | Iseki & Co Ltd | Hydraulic clutch boost circuit |
| JP2009030805A (en) * | 2007-07-30 | 2009-02-12 | Volvo Construction Equipment Ab | Hydraulic circuit for construction machinery having variable control device |
-
1990
- 1990-06-26 JP JP6681390U patent/JPH0426700U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11230200A (en) * | 1998-02-20 | 1999-08-27 | Iseki & Co Ltd | Hydraulic clutch boost circuit |
| JP2009030805A (en) * | 2007-07-30 | 2009-02-12 | Volvo Construction Equipment Ab | Hydraulic circuit for construction machinery having variable control device |
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