本刊77年第2期介绍的“可变轨迹平板研磨压砂机”,在工作中是用手转动回旋盘而使下平板达到顺(逆)时针转动90°要求的。其缺点不但费力,且不能使平板作360°的自由转动。后来,我们对转动机构作了改进。如图所示,在回旋盘10下面有一 The magazine published in 1977 No. 2 introduced the “variable trajectory flat grinding sand mill”, in the work is by hand rotating the revolving plate so that the lower plate to achieve the (reverse) clockwise rotation of 90 ° requirements. The disadvantage is not only laborious, and can not make the flat 360 ° free rotation. Later, we made improvements to the rotating mechanism. As shown, there is one under the carousel 10