METHOD, APPARATUS, AND SYSTEM FOR CONTROLLING PUMPING DIRECTION-SWITCHING FOR USE IN PUMPING APPARATUS

摘要

A method, apparatus, and system for controlling pumping direction-switching for use in a pumping apparatus. The system comprises at least two first proximity switches (110) used for detecting whether a first oil cylinder piston (61) has reached a predetermined position; at least one second proximity switch (120) used for detecting whether a second oil cylinder piston (62) has reached a predetermined position; and a controller connected to the at least two first proximity switches (110) and to the at least one second proximity switch (120), used for selecting a proximity switch combination, and, when the selected proximity switch combination detects that the first oil cylinder piston (61) or the second oil cylinder piston (62) has reached the predetermined position, for controlling a direction-switching valve of the pumping apparatus to switch directions. The proximity switch combination comprises one of the at least two first proximity switches (110) and one of the at least one second proximity switch (120). When a proximity switch is damaged, another proximity switch is used to replace the damaged proximity switch, thereby ensuring that the control over direction-switching is maintained.