Control system and method for multi-stage safety handle of excavator

Abstract

The invention discloses a control system and method for a multi-stage safety handle of an excavator. The control system comprises a first-stage contact switch, a second-stage contact switch, the safety handle, a pilot oil source, a left pilot handle, a right pilot handle, a first-stage safety electromagnetic valve, a second-stage safety electromagnetic valve, a rotary safety valve and a walking pedal valve. The first-stage contact switch and the second-stage contact switch are independently arranged in the safety handle. The first-stage safety electromagnetic valve is connected with the first-stage contact switch, the pilot oil source, the left pilot handle and the right pilot handle respectively. The second-stage safety electromagnetic valve is connected with the second-stage contact switch, the pilot oil source, the walking pedal valve and the rotary safety valve respectively. The rotary safety valve is further connected with the left pilot handle and controls connection and disconnection between rotary pilot oil pressure output by the left pilot handle and a main valve rotary valve element of the excavator. According to the control system and method, when the excavator works under the condition that the activity space is extremely limited during excavation, in order to reduce potential safety hazards caused by manual operation errors, walking and rotating operations are limited through the safety handle, and operation safety is improved.

Description

technical field [0001] The invention belongs to the technical field of safety handle control, and in particular relates to an excavator multi-level safety handle control system and method. Background technique [0002] In order to prevent safety problems caused by misoperation, a safety handle is usually provided between the entrance of the excavator cab and the seat. When a person leaves the seat, the safety handle needs to be lowered to keep the passage unblocked. At this time, the pilot hydraulic oil cannot be supplied to the pilot handle and the travel foot valve, and the excavator will not respond to the operation of the pilot handle and the travel foot valve. [0003] When the excavator is walking and slewing, there is a large blind spot in the turning of the boarding vehicle and the movement of the vehicle body. When the surrounding environment is complex, it is easy to cause safety problems such as collisions and stepping on the air. Under the existing technical sch...

AI Technical Summary

Problems solved by technology

[0003] When the excavator is walking and slewing, there is a large blind area of ​​vision for the turning of the boarding vehicle and the movement of the vehicle body. When the surrounding environment is complex, safety problems such as collisions and stepping on air are prone to occur.

Under the existing technical scheme, since there are no special restrictions on walking and turning, it is impossible to avoid safety problems caused by misoperation of walking and turning movements in complex working environments

Images