A self-adaptive control system for feeding a mouth opening of a round bale bundling machine, comprising a feeding device, a rotary coder, a displacement sensor, a hydraulic regulation system, and a controller, wherein,
- the rotary coder is installed on the shaft end of a feeding knife roller of the feeding device to measure the rotation speed of the feeding knife roller;
- a lug ring of the displacement sensor is mounted on a left shaft, a measuring rod of the displacement sensor is connected to a left shaft pin to measure the displacement of the piston rods in the left oil cylinder and right oil cylinder of the feeding device;
- the hydraulic regulation system comprises a first oil pressure sensor, a three-position four-way solenoid directional valve, an oil pump, a check valve, an accumulator, and a second oil pressure sensor, wherein, the oil pump is connected to an oil tank through a pipeline, an oil supply port P of the three-position four-way solenoid directional valve is connected to the oil pump, an oil return port T of the three-position four-way solenoid directional valve is connected to the oil tank, and a service port A of the three-position four-way solenoid directional valve is connected to the check valve and an oil circuit of rod cavities of the left oil cylinder and right oil cylinder sequentially through a pipeline;
- a service port B of the three-position four-way solenoid directional valve is connected to an oil circuit of the rod-less cavities of the left oil cylinder and right oil cylinder through a pipeline, the first oil pressure sensor is installed in the oil circuit of the rod-less cavities of the left oil cylinder and right oil cylinder of the feeding device to measure the oil pressure in the rod-less cavities;
- the second oil pressure sensor is installed in the oil circuit of rod cavities of the left oil cylinder and right oil cylinder of the feeding device to measure the oil pressure in the rod cavities;
- the accumulator is connected in parallel between the oil circuit of the rod cavities of the left oil cylinder and right oil cylinder and the check valve;
- and
- the input end of the controller is electrically connected to the rotary coder, the displacement sensor, the first oil pressure sensor, and the second oil pressure sensor respectively, and the output end of the controller is electrically connected to the three-position four-way solenoid directional valve via an interlocking controller;
- the controller takes the bearing force of the piston rods and the rotation speed and rotation speed change rate of the feeding knife roller as input variables, and takes the positions of the piston rods as an output variable, so as to establish a fuzzy control model of the feeding mouth opening of the feeding device, and the extension and retraction of the piston rods in the left oil cylinder and right oil cylinder under hydraulic driving are regulated actively by controlling the three-position four-way solenoid directional valve, and thereby self-adaptive control of the feeding mouth opening is achieved.