TANDEM HYDRAULIC CYLINDERS AND STROKE CONTROL DEVICE AND METHOD THEREOF

摘要

Disclosed are tandem hydraulic cylinders and a stroke control device and a method thereof. The tandem hydraulic cylinders comprise a first hydraulic cylinder (12) having a piston rod (125) which is capable of moving reciprocatively and at least one direction switch signal generator (16) used for providing direction switch signal for the piston rod, a second hydraulic cylinder (14) having a piston rod (145) which is capable of moving reciprocatively and at least one direction switch signal generator (17) used for providing direction switch signal for the piston rod. The rod end chamber (121) of the first hydraulic cylinder and the rod end chamber (141) of the second hydraulic cylinder are communicated with each other to form a communicating chamber, or the rodless chamber (123) of the first hydraulic cylinder and the rodless chamber (143) of the second hydraulic cylinder are communicated with each other to form a communicating chamber. The tandem hydraulic cylinders further comprise two stroke position collectors (18, 19) which are disposed staggeredly in the longitudinal direction of the tandem hydraulic cylinders to form a control area of the hydraulic cylinder stroke. It can more accurately control the position of the piston rod of the hydraulic cylinder by controlling the hydraulic cylinder in the control area and regulating the oil volume of the communicating chamber in real time and continuously.