我所研制的WY—40型液压挖树根机(图1),1981年7月通过了省级鉴定。该机是垦荒前挖除树根所必须的机具,适于平原、丘陵、灌木丛,坡度7°以下的荒场,亦可用于林业采伐迹地挖树根作业。该机经过试验,在正常作业条件下,能够挖除不同树种的直径在40厘米以下的树根。还可挖掘整棵树,并能定向倒树。挖根质量好,生产效率高,耗油少,作业成本低。经测定,挖根率为97%,未挖清率 I developed WY-40-type hydraulic digging root machine (Figure 1), in July 1981 passed the provincial appraisal. This machine is a necessary tool for excavating roots before reclamation. It is suitable for plains, hills, shrubs and desolation slopes with a slope of less than 7 °. It can also be used for digging roots for cutting land in forestry. The machine after the test, under normal operating conditions, can dig different tree species diameter of 40 cm below the roots. Can also tap the whole tree, and can be directed to fall trees. Good rooting quality, high production efficiency, low fuel consumption, low operating costs. After determination, rooting rate of 97%, did not dig rate