Shovel

Abstract

A shovel includes an electrically driven part subjected to temperature control during operation, a battery that supplies electric power to a constant electrical load that constantly operates apart from the electrically driven part, a first switch, and a second switch. The first switch opens or closes a power supply line between a temperature controller that controls the temperature of the electrically driven part and a photovoltaic power generator based on the temperature detection value of a temperature detector that detects the temperature of the electrically driven part. The second switch opens or closes a power supply line between the temperature controller and the battery based on the temperature detection value of the temperature detector.

1 . A shovel, comprising:
 a lower-part traveling body;   an upper-part turning body rotatably provided on the lower-part traveling body;   an electrically driven part provided in the upper-part turning body and subjected to temperature control during an operation;   a battery provided in the upper-part turning body and configured to supply electric power to a constant electrical load that constantly operates apart from the electrically driven part;   a photovoltaic power generation panel provided on the upper-part turning body;   a photovoltaic power generator provided in the upper-part turning body, the photovoltaic power generator including a photovoltaic electric power accumulating part configured to accumulate electric power generated by the photovoltaic power generation panel; and a voltage detector configured to detect an output voltage of the photovoltaic electric power accumulating part;   a temperature controller connected to the photovoltaic power generator and the battery;   a temperature detector configured to detect a temperature of the electrically driven part;   a first switch configured to open or close a power supply line connecting the temperature controller and the photovoltaic power generator based on a temperature detection value of the temperature detector;   a second switch configured to open or close a power supply line connecting the temperature controller and the battery based on the temperature detection value of the temperature detector; and   a controller configured to be supplied with a voltage detection value from the voltage detector and the temperature detection value from the temperature detector and to transmit signals to the first switch and the second switch.   
     
     
         2 . The shovel as claimed in  claim 1 , further comprising:
 a third switch configured to open or close a power supply line between the photovoltaic power generator and the first and second switches based on the voltage detection value of the voltage detector.   
     
     
         3 . The shovel as claimed in  claim 2 , wherein the first switch is closed, the second switch is open, and the third switch is closed when the temperature detection value of the temperature detector is higher than a predetermined temperature value and the voltage detection value of the voltage detector is higher than a predetermined voltage value. 
     
     
         4 . The shovel as claimed in  claim 2 , wherein the first switch is closed, the second switch is closed, and the third switch is open when the temperature detection value of the temperature detector is higher than a predetermined temperature value and the voltage detection value of the voltage detector is lower than or equal to a predetermined voltage value. 
     
     
         5 . The shovel as claimed in  claim 2 , wherein the first switch is open, the second switch is closed, and the third switch is closed when the temperature detection value of the temperature detector is lower than or equal to a predetermined temperature value and the voltage detection value of the voltage detector is higher than a predetermined voltage value. 
     
     
         6 . The shovel as claimed in  claim 2 , wherein the first switch is closed, the second switch is open, and the third switch is closed when the temperature detection value of the temperature detector is lower than a predetermined temperature value and the voltage detection value of the voltage detector is higher than a predetermined voltage value. 
     
     
         7 . The shovel as claimed in  claim 2 , wherein the first switch is closed, the second switch is closed, and the third switch is open when the temperature detection value of the temperature detector is lower than a predetermined temperature value and the voltage detection value of the voltage detector is lower than or equal to a predetermined voltage value. 
     
     
         8 . The shovel as claimed in  claim 2 , wherein the first switch is open, the second switch is closed, and the third switch is closed when the temperature detection value of the temperature detector is higher than or equal to a predetermined temperature value and the voltage detection value of the voltage detector is higher than a predetermined voltage value. 
     
     
         9 . The shovel as claimed in  claim 1 , wherein the electrically driven part is a main electric power accumulating unit. 
     
     
         10 . The shovel as claimed in  claim 1 , wherein the electrically driven part includes at least one of an inverter, a converter, and a controller.