JPH0373710U - - Google Patents
Info
- Publication number
- JPH0373710U JPH0373710U JP13481789U JP13481789U JPH0373710U JP H0373710 U JPH0373710 U JP H0373710U JP 13481789 U JP13481789 U JP 13481789U JP 13481789 U JP13481789 U JP 13481789U JP H0373710 U JPH0373710 U JP H0373710U
- Authority
- JP
- Japan
- Prior art keywords
- valves
- main poppet
- opening area
- valve
- pilot valve
- 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 3
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
Landscapes
- Operation Control Of Excavators (AREA)
- Component Parts Of Construction Machinery (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の第１実施例を示す断面図、第
２図は第２実施例を示す断面図、第３図はその操
作弁と主ポペツト弁の開度を示す図表、第４図は
従来例の断面図、第５図はその操作弁と落下防止
弁の開度を示す図表、第６図は先に提案した落下
防止装置の断面図である。
１０，２０……作業機シリンダ、１０ａ，２０
ａ……上げ室、１２，２１……管路、１３，２２
……操作弁、１６，３０……主ポペツト弁、１７
，３２……パイロツト弁、１６ａ，３４……ポペ
ツト、１８，５２……通路、１９，５３……チエ
ツク弁。
Fig. 1 is a sectional view showing the first embodiment of the present invention, Fig. 2 is a sectional view showing the second embodiment, Fig. 3 is a chart showing the opening degrees of the operating valve and the main poppet valve, and Fig. 4. 5 is a sectional view of the conventional example, FIG. 5 is a chart showing the opening degrees of the operating valve and fall prevention valve, and FIG. 6 is a sectional view of the previously proposed fall prevention device. 10, 20... Work machine cylinder, 10a, 20
a... Raising chamber, 12, 21... Piping, 13, 22
...Operation valve, 16,30...Main poppet valve, 17
, 32... Pilot valve, 16a, 34... Poppet, 18, 52... Passage, 19, 53... Check valve.
Claims (1)
０ａを、主ポペツト弁１６，３０及び管路１２，
２１を経て操作弁１３，２２に接続し、 前記主ポペツト弁１６，３０の上げ室１０ａ，
２０ａと管路１２，２１を連通・遮断するポペツ
ト弁１６ａ，３４を、バネ力で遮断位置とし、か
つ内部を流通する上げ室１０ａ，２０ａ内の圧油
流量に比例して連通位置に向けて移動するように
し、 前記主ポペツト弁１６，３０の内部を流通した
圧油出口側と主ポペツト弁出口側に連通した通路
１８，５２を連通・遮断するパイロツト弁１７，
３２を設け、その通路１８，５２にチエツク弁１
９，５３を設け、 前記パイロツト弁１７，３２を常時遮断位置で
、かつ前記操作弁１３，２２の下げ信号により離
隔する方向に移動する構成とし、 前記操作弁１３，２２の下げ信号により開口面
積を、前記パイロツト弁１７，３２の開口面積に
比べて著しく大きく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。[Claims for Utility Model Registration] Raising chambers 10a and 2 of work machine cylinders 10 and 20
0a to the main poppet valves 16, 30 and the pipe line 12,
21 to the operating valves 13, 22, and the raising chambers 10a of the main poppet valves 16, 30.
The poppet valves 16a, 34, which communicate and cut off the pipes 12, 21 with the pipes 12, 20a, are set to the blocking position by spring force, and are moved toward the communicating position in proportion to the flow rate of pressure oil in the raised chambers 10a, 20a flowing therethrough. a pilot valve 17 that is movable and communicates and blocks the pressure oil outlet side that flows inside the main poppet valves 16, 30 and the passages 18, 52 that communicate with the main poppet valve outlet side;
32, and the check valve 1 is installed in the passages 18, 52.
9 and 53, the pilot valves 17 and 32 are always in the shutoff position and are moved in the direction of separation by the lowering signal of the operating valves 13 and 22, and the opening area is changed by the lowering signal of the operating valves 13 and 22. A rapid fall prevention device for a working machine cylinder, characterized in that the opening area of the pilot valve 17, 32 is significantly larger than the opening area of the pilot valve 17, 32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13481789U JPH0373710U (en) | 1989-11-22 | 1989-11-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13481789U JPH0373710U (en) | 1989-11-22 | 1989-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0373710U true JPH0373710U (en) | 1991-07-24 |
Family
ID=31682124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13481789U Pending JPH0373710U (en) | 1989-11-22 | 1989-11-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0373710U (en) |
-
1989
- 1989-11-22 JP JP13481789U patent/JPH0373710U/ja active Pending
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