| 摘要 |
FIELD: transport.SUBSTANCE: invention relates to crane protection device which can be steadily used at temperatures not exceeding minimum operation temperature of electronics. Heaters (22c) and two thermostats (22a, 22b) with different operating temperature are installed in control panel, jib length sensor (22), jib angle sensor (23), jib raising and lowering cylinder pressure sensor. The heaters (22c) are switched on by means of switching on the first thermostat (22a) when electronic devices (22, 23) temperature does not exceed the first preset temperature (0°C), and electronic devices (22, 23) are heated to the first preset temperature. Additionally, crane operation is limited and lamp is turned on by means of the second thermostat (22b) switching off when electronic devices (22, 23) temperature does not exceed the second preset temperature (-10°C).EFFECT: maintaining operation temperature of electronics, prevention of chatter, higher safety, lower cost of protection device.5 cl, 7 dwg |
