JPH0373714U - - Google Patents
Info
- Publication number
- JPH0373714U JPH0373714U JP13482189U JP13482189U JPH0373714U JP H0373714 U JPH0373714 U JP H0373714U JP 13482189 U JP13482189 U JP 13482189U JP 13482189 U JP13482189 U JP 13482189U JP H0373714 U JPH0373714 U JP H0373714U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- port
- oil hole
- tank
- main
- 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
- 230000002265 prevention Effects 0.000 claims description 2
Landscapes
- Operation Control Of Excavators (AREA)
- Component Parts Of Construction Machinery (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の実施例を示す断面図、第２図
は従来例の断面図である。
２０……作業機シリンダ、２０ａ……上げ室、
２０ｂ……下げ室、２１……落下防止弁、２２…
…弁本体、２７……ロードチエツク弁、２８……
流量制御弁、２９……弁孔、３０……主スプール
、３２……入口ポート、３３……出口ポート、３
５……シート、４０……操作弁、４１，４３……
第１・第２ポート、４２……配管、４５……戻り
配管。
FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 20... Work machine cylinder, 20a... Raising chamber,
20b... Lowering chamber, 21... Fall prevention valve, 22...
...Valve body, 27...Load check valve, 28...
Flow rate control valve, 29... Valve hole, 30... Main spool, 32... Inlet port, 33... Outlet port, 3
5... Seat, 40... Operation valve, 41, 43...
1st and 2nd ports, 42...piping, 45...return piping.
Claims (1)
た入口ポート３２とタンクポート２６に開口した
出口ポート３３を形成し、この弁孔２９内に下げ
信号により摺動して入口ポート３２と出口ポート
３３を連通し、かつシート面に圧着するシート３
５を備えた主スプール３０を摺動自在に嵌挿して
流量制御弁２８とし、前記主油孔２５の入口側に
ロードチエツク弁２７を設けて落下防止弁２１と
し、 この落下防止弁２１の主油孔２５におけるロー
ドチエツク弁２７の入口側を操作弁４０の第１ポ
ート４１に配管４２で連通し、かつ出口側を作業
機シリンダ２０の上げ室２０ａに連通し、その下
げ室２０ｂを操作弁４０の第２ポート４３に連通
し、 前記タンクポート２６を戻り配管４５でタンク
に連通したことを特徴とする作業機シリンダの急
速落下防止装置。[Claim for Utility Model Registration] The valve hole 29 of the valve body 22 is formed with an inlet port 32 that opens to the main oil hole 25 and an outlet port 33 that opens to the tank port 26. A sheet 3 that slides to connect the inlet port 32 and the outlet port 33 and is crimped onto the sheet surface.
A main spool 30 equipped with a main oil hole 25 is slidably inserted into the main spool 30 to serve as a flow rate control valve 28, and a load check valve 27 is provided on the inlet side of the main oil hole 25 to serve as a fall prevention valve 21. The inlet side of the load check valve 27 in the oil hole 25 is communicated with the first port 41 of the operation valve 40 through a pipe 42, the outlet side is communicated with the raising chamber 20a of the working machine cylinder 20, and the lowering chamber 20b is connected to the operation valve 40. 40, and the tank port 26 is connected to the tank through a return pipe 45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13482189U JPH0373714U (en) | 1989-11-22 | 1989-11-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13482189U JPH0373714U (en) | 1989-11-22 | 1989-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0373714U true JPH0373714U (en) | 1991-07-24 |
Family
ID=31682128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13482189U Pending JPH0373714U (en) | 1989-11-22 | 1989-11-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0373714U (en) |
-
1989
- 1989-11-22 JP JP13482189U patent/JPH0373714U/ja active Pending