JPS5449746A - Operation control device for hydraulic crane - Google Patents
Operation control device for hydraulic craneInfo
- Publication number
- JPS5449746A JPS5449746A JP11409377A JP11409377A JPS5449746A JP S5449746 A JPS5449746 A JP S5449746A JP 11409377 A JP11409377 A JP 11409377A JP 11409377 A JP11409377 A JP 11409377A JP S5449746 A JPS5449746 A JP S5449746A
- Authority
- JP
- Japan
- Prior art keywords
- safety
- crane
- circuit
- valve
- disrupted
- 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
Landscapes
- Control And Safety Of Cranes (AREA)
Abstract
PURPOSE: To provide an operation control device which ensures the safety of the crane while permitting the crane to be selfreturned to the safety position depending on the operation on the safe side by leaving the operation on the safe side continuing while the operation on the hazardous side alone is disrupted when overload is applied.
CONSTITUTION: When a detection switch 26 is closed as the boom length, the boom angle or the maximum lifting load exceeds the safety allowable limit, a relay coil 27 is energized through a series circuit of a normally open limit switch LS and the detection switch 26 where a control lever of a direction control valve is set, if the valve among direction control valves 5 to 8 is located at the operation position on hazardous side, and with the excitation of a solenoid 29, a changeover valve 23 is the closed. Consequently, pressure oil in pressure reduction circuit 9 to 11 to respective actuators 1 to 4 passes through vent circuit 20 to 22 and is drained to a tank 13 from a tank circuit 12 through the changeover valve 23. Accordingly, the operation on the hazardous side is disrupted whereby the safety of the crane is maintained
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11409377A JPS5449746A (en) | 1977-09-22 | 1977-09-22 | Operation control device for hydraulic crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11409377A JPS5449746A (en) | 1977-09-22 | 1977-09-22 | Operation control device for hydraulic crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5449746A true JPS5449746A (en) | 1979-04-19 |
Family
ID=14628917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11409377A Pending JPS5449746A (en) | 1977-09-22 | 1977-09-22 | Operation control device for hydraulic crane |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5449746A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102942118A (en) * | 2012-11-26 | 2013-02-27 | 中联重科股份有限公司 | Anti-stall control system and method for closed hoisting mechanism |
-
1977
- 1977-09-22 JP JP11409377A patent/JPS5449746A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102942118A (en) * | 2012-11-26 | 2013-02-27 | 中联重科股份有限公司 | Anti-stall control system and method for closed hoisting mechanism |
| CN102942118B (en) * | 2012-11-26 | 2014-12-17 | 中联重科股份有限公司 | Anti-stall control system and method for closed hoisting mechanism |
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