Safety device for preventing working-apparatus operation during regeneration of forklift-truck diesel-exhaust gas after-treatment device

Abstract

A safety device, preventing working-apparatus operation during regeneration of a diesel-exhaust-gas after-treatment device, comprises: a hydraulic pump discharging high-pressure hydraulic fluid; a main control valve, with working-apparatus control valves, providing hydraulic fluid to a desired working apparatus among a plurality of working apparatuses; an adjustment control valve controlled to provide pilot hydraulic fluid to the working-apparatus control valves due to actuation of an actuation lever; a pressure-reducing valve effecting control such that high-pressure hydraulic oil from the hydraulic pump is reduced in pressure to the pressure of the pilot hydraulic fluid, and which supplies pressure-reduced hydraulic fluid to the adjustment control valve; and a control-valve unit, disposed upstream of the adjustment control valve, controlled to cut off supply of pressure-reduced hydraulic fluid to the adjustment control valve upon receiving a signal from the control unit, based on worker departure data when a worker leaves the driving seat during the regeneration.

1 . A safety device for preventing a working apparatus from being operated during regeneration of a diesel exhaust gas after-treatment device of a forklift-truck, comprising:
 a hydraulic pump configured to discharge high-pressure working fluid;   a main control valve provided with a plurality of working apparatus control valves, and configured to provide the working fluid to a desired working apparatus among a plurality of working apparatuses;   a remote control valve controlled so as to provide pilot working fluid to the plurality of working apparatus control valves according to an operation of a working apparatus actuation lever;   a pressure-reducing valve controlled in such a way that high-pressure working fluid discharged from the hydraulic pump is pressure-reduced to a pressure of the pilot working fluid to provide the pressure-reduced working fluid to the remote control valve; and   a control valve unit disposed upstream of the remote control valve, and controlled in such a way so as to block the pressure-reduced working fluid from being provided to the remote control valve by receiving a signal from the controller based on worker departure information when a worker leaves a driver's seat during regeneration of a diesel particulate filter.   
     
     
         2 . The safety device of  claim 1 , wherein when the worker sits on the driver's seat, the worker departure information is released, so that the control valve unit  100  is controlled to be open. 
     
     
         3 . The safety device of  claim 1 , wherein a signal generated by a seat switch provided at the driver's seat is transmitted to an engine control unit (ECU), and the transmitted signal transmits the worker departure information from the ECU to the controller. 
     
     
         4 . The safety device of  claim 2 , wherein a signal generated by a seat switch provided at the driver's seat is transmitted to an engine control unit (ECU), and the transmitted signal transmits the worker departure information from the ECU to the controller.