JPH0426699U - - Google Patents
Info
- Publication number
- JPH0426699U JPH0426699U JP6681290U JP6681290U JPH0426699U JP H0426699 U JPH0426699 U JP H0426699U JP 6681290 U JP6681290 U JP 6681290U JP 6681290 U JP6681290 U JP 6681290U JP H0426699 U JPH0426699 U JP H0426699U
- Authority
- JP
- Japan
- Prior art keywords
- relief valve
- protector
- valve
- pressure
- overload
- 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
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000036316 preload Effects 0.000 claims 3
- 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、９……主リリーフ弁、１０は
補助リリーフ弁、１２は電流比例圧力調整弁。
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, 9 is a main relief valve, 10 is an auxiliary relief valve, and 12 is a current proportional pressure regulating valve.
Claims (1)
ダ４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と共に、過負荷時プロテク
タシリンダ４内に発生する油圧により補助リリー
フ弁１０を動作させて主リリーフ弁９のプリロー
ド圧を解除することにより、主リリーフ弁９を開
放してプロテクタシリンダ４内の油圧を逃すよう
にしてなるプレスのオーバロード保護回路。 (2) 主リリーフ弁９に付加するプリロード圧を
遠隔制御可能な電流比例圧力調整弁１２により調
整自在としてなる請求項１記載のオーバロード保
護回路。[Claims for Utility Model Registration] (1) The protector cylinder 4 provided on the slide 2 and the protector valve 8 are connected, and the hydraulic pressure generated due to the overload applied to the slide 2 during press work is transmitted through the protector valve 8. In a press overload protection circuit that avoids overload by releasing pressure, the protector valve 8 is composed of a main relief valve 9 and an auxiliary relief valve 10, and a preload pressure is applied to the spool 9a of the main relief valve 9. At the same time, by operating the auxiliary relief valve 10 with the hydraulic pressure generated in the protector cylinder 4 during overload and releasing the preload pressure of the main relief valve 9, the main relief valve 9 is opened and the pressure inside the protector cylinder 4 is released. Press overload protection circuit that releases hydraulic pressure. (2) The overload protection circuit according to claim 1, wherein the preload pressure applied to the main relief valve 9 can be freely adjusted by a remote-controllable current proportional pressure regulating valve 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6681290U JPH0426699U (en) | 1990-06-26 | 1990-06-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6681290U JPH0426699U (en) | 1990-06-26 | 1990-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0426699U true JPH0426699U (en) | 1992-03-03 |
Family
ID=31599847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6681290U Pending JPH0426699U (en) | 1990-06-26 | 1990-06-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0426699U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009030805A (en) * | 2007-07-30 | 2009-02-12 | Volvo Construction Equipment Ab | Hydraulic circuit for construction machinery having variable control device |
| JP2012240078A (en) * | 2011-05-18 | 2012-12-10 | Nippon Steel Engineering Co Ltd | Agglomerating machine and agglomerating method |
| WO2019111390A1 (en) * | 2017-12-07 | 2019-06-13 | 株式会社泉精器製作所 | Electrically powered tool |
-
1990
- 1990-06-26 JP JP6681290U patent/JPH0426699U/ja active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009030805A (en) * | 2007-07-30 | 2009-02-12 | Volvo Construction Equipment Ab | Hydraulic circuit for construction machinery having variable control device |
| JP2012240078A (en) * | 2011-05-18 | 2012-12-10 | Nippon Steel Engineering Co Ltd | Agglomerating machine and agglomerating method |
| WO2019111390A1 (en) * | 2017-12-07 | 2019-06-13 | 株式会社泉精器製作所 | Electrically powered tool |
| US11241780B2 (en) | 2017-12-07 | 2022-02-08 | Maxell Izumi Co., Ltd. | Electric tool |
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