On the Tillage Energy of Crank Type Mechanism
1955 Volume 17 Issue 2 Pages 67-71
Details
1955 Volume 17 Issue 2 Pages 67-71
In order to mitigate tillage energy and improve deep till ability, auther designed and made a installation which allied mechanism of Charpy Tester to measure tillage energy, and mainly as result of experiments on sand soils would be able to keep uniformity of condition, obtained the following conclusins.
1) On the similler pitch, in case the tillage depth less than 12cm, change of energy are comparatively little but in case the depth larger than 12cm it has suddenly need of large energy. Tendeny of the enlargement of energy with increrse the depth, the larger pitch the more.
2) In case the piercing degree (β) of cutlery should be changed by shaft of supporter (γ) moved horizontally, when the theoretical pitch (ps) are little comparativelp, energy take the smallest figure in about 82°-83°, and the larger (ps) the better (β) allow to approach 90° gradually.
3) Energy are small in case the length (E) of supporter shortend, but taking care on being bigger (β), revolving motion of crank, and maximum depth, etc, (E) are desirable as shorten as possible.
4) In case changed the locus degree (γ) of cutlery's extremity with moving shaft of supporter (γ) vertically, (γ) are desirable above 67°. But as maximum permissible pitch (pm) became smaller in case (γ) grow larger, for limit of (pm) need above 8cm, I recognized (γ) should be controlled less than about 70° against (β)=82°.
5) For in case the length of connecting-rod (C) are too shortend energy grow larger, and in case the (C) are too long (γ) grow bigger, its length should be decided taking care on (pm).
6) In case the pitch are 1-7cm and tillage depth are 15cm, tillage energy per pitch on sand soils are 7-11kg·cm/cm (7-8 in the state of good mechanism) and generally the larger pitch its figures should become the more. By citing a few experiments which have been put in practice, energy on loam soils or clay soils need 5-6 or 6-9 times on sand soils respectively, and the larger pitch its ratio should become the more.
