Development and experiment of suspension ridger and its key components for paddy field

Abstract: Artificial ridge building is very labor intensive and the ridge building quality is difficult to be guaranteed, so ridge building must be achieved by a ridge building machine. For paddy-field machinery ridge building technology, Japan is the world's leading researcher. However, Chinese and Japanese soil is different, so Japan's ridge building machine is not suitable to operate in China. In order to solve the high labor intensity for artificial ridge building, a hanging paddy-fields ridge building machine was designed, whose structure and working mechanism were introduced. The ridge is built by adopting the up and under, two groups of rotary tillage blades to gather soil and the coin disc and roller to compact soil. The under rotary tillage device was composed of rotary tillage blades with different gyration radius, while the up rotary tillage device was composed of rotary tillage blades with the same gyration radius. The under rotary tillage device can get soil, throw soil and cut out step-type ridges in the rotation process. The pushing and compacting ridge building coin disc can collect soil and compact soil on the step-type ridge, which makes the built ridge more solid and resistant to collapsing. The up rotary tillage device can break dry soil and weed in the soil surface, which ensures the ridge building will be more solid. The kinematic analysis model for rotary tillage device of ridge building was established, through analyzing the kinematic model, the parameters values and changing range of rotary collecting blades for soil were determined, the rotational speed is 300r/min, the number of down rotary collecting blades is 5~7, and up rotary collecting blades is 3~4, the width of collecting soil is150 mm, the depth of collecting soil is 20~95 mm. Through stress analysis of soil from compacting ridge building devices, the driving moment for soil compacting was obtained and the soil compacting ridge building device was designed, which also provided reasonable parameters for the optimization of compacting ridge building device. A 180° turn-over device was designed, which solved the ridge building problem in the corner of field ridges. When the soil absolute moisture content was 23.3%, the soil solid degrees was 0.31 MPa, the environment temperature was 18℃ and environment humidity was 49%. Performance testing was carried out for the ridge building machine, and the test results show that the built ridge had good quality, and had reached the agronomic technical requirements.