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今提供的增减作用力基本回路如图1所示。它能在一次工作循环过程中利用四位六通换向阀的换向,取得双级活塞的有效工作面积的变化而实现我们事先选定的由小变大(或由大变小)的不同作用力。图2中四位六通换向阀的(1)、(4)两个位置均是活塞处在工作油缸右面位置。当我们要使本液压油路中工作缸活塞的作用力由第一种P_1增大为第二种P_2时,四位六通换向阀的换向位置应按由(1)→(2)→(3)的顺序进行。如果相反地要得到由第一种作用力P_1减至第二种作用力P_2时,则四位六通换向阀的换向位置应按(4)→(3)→(2)顺
The basic circuit provided by the increase and decrease of force shown in Figure 1. It can make use of the reversing direction of the four-position six-way reversing valve during a work cycle to obtain the change of the effective working area of the two-stage piston so as to realize the difference from small to large (or from small to large) selected in advance Force. Figure 2 four-way six-way valve (1), (4) two positions are in the work of the right cylinder piston position. When we want to make the hydraulic cylinder hydraulic cylinder piston force from the first P_1 increased to a second P_2, four six-way valve reversing position should be (1) → (2) → (3) in the order. If, on the contrary, it is to be reduced by the first force P_1 to the second force P_2, the reversing position of the four-position six-way reversing valve shall be in the order of (4) → (3) → (2)