JPS5470548A - Protective apparatus for crane - Google Patents
Protective apparatus for craneInfo
- Publication number
- JPS5470548A JPS5470548A JP13537277A JP13537277A JPS5470548A JP S5470548 A JPS5470548 A JP S5470548A JP 13537277 A JP13537277 A JP 13537277A JP 13537277 A JP13537277 A JP 13537277A JP S5470548 A JPS5470548 A JP S5470548A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- directed
- motor
- crane
- protective apparatus
- 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.)
- Granted
Links
Landscapes
- Control And Safety Of Cranes (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
PURPOSE: To construct a protective apparatus inexpensive and operable more effectively by direct detection of non-coincidence between the command speed and the speed of the motor, a trouble inducing a hindrance of the crane.
CONSTITUTION: A wound-rotor induction motor 1 of the crane is driven based on the speed directed by a controller 5 while the speed is detected with a directed speed dynamo 4. A difference between the actual speed and the directed speed is fed to a control coil of a saturable reactor 2 through an amplifier 6 whereby the torque of the motor is controlled. A protective apparatus of such an equipment are equipped with relays #1 to #4 serving as respective notch signals and a voltage relays S1 to S4 adapted to actuate a brake opening/closing contactor B by judging a trouble of the equipment from a state in which the speed of the motor exceeds the directed speed by more than a given value in each notch, and a timer T.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13537277A JPS5470548A (en) | 1977-11-11 | 1977-11-11 | Protective apparatus for crane |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13537277A JPS5470548A (en) | 1977-11-11 | 1977-11-11 | Protective apparatus for crane |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5470548A true JPS5470548A (en) | 1979-06-06 |
JPS551230B2 JPS551230B2 (en) | 1980-01-12 |
Family
ID=15150170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13537277A Granted JPS5470548A (en) | 1977-11-11 | 1977-11-11 | Protective apparatus for crane |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5470548A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5882307U (en) * | 1981-11-30 | 1983-06-03 | 株式会社吉野工業所 | Synthetic resin bottle |
JPH041576U (en) * | 1990-04-17 | 1992-01-08 |
-
1977
- 1977-11-11 JP JP13537277A patent/JPS5470548A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS551230B2 (en) | 1980-01-12 |
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