The paper introduces the hydraulic jack-up system design about the first domestic self-installing product platform. According to the production platform features, the jack-up system chooses the mode of hydraulic cylinder driving. So the jack-up system is both economy and safe reliability. The jack-up system is equipped with proportional valve and the PLC programmable controller which has a touch panel to show the inclination of the platform, the synchronism of hydraulic cylinders in the four legs of the platform, the state of the piston pin and the alarm indication of the hydraulic power station etc.

A new model of fly-wheel type chaffcutter was designed and the feeding mechanism and chopper design were described in detail in this paper. The theoretical calculation result verifies that each of the construction parameters can be able to satisfy the designing requirements. Then a performance test was conducted for the chaffcutter taking the production efficiency, fodder cutting quality and power consumption as the main check target of performance and the testing result reveals that the fodder cutting quality appears to be satisfactory and the power consumption is also within the limits acceptable when the productivity is around 780 kg/h, but the fodder cutting quality is hard to be guaranteed when the productivity goes beyond the one of 900 kg/h. The achievement in this study may provide a certain references for the design and test of chaffcutter.