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B690液压牛刨因油路设计不够完善,在使用时存在着油温过高的缺点。采用外接油箱把油泵移到油池上面,虽能降低油温,但体积增大,为此,我厂不是采用这种方法,而是从油路上进行改进。该机床为了得到较大的变速范围,采用双泵并联供油形式来获得四种滑枕运动速度。当变级滑阀1处于图1a所示位置时(即第Ⅰ级速度),这时仅有50l/min油泵经管路k供给压力油,而100l/min油泵的油液经管路n、m、背压阀2回油池。这个背压阀除了能使滑枕运动速度平稳外,还对进给油缸的进给量有影响。当把背压阀的压力调节低一些,虽能降低油
B690 hydraulic bulldozer due to inadequate oil circuit design, there is the shortcomings of the oil temperature is too high. The use of an external tank to move the oil pump above the tank, although the oil temperature can be reduced, but the volume increases, for which I plant this method is not used, but from the oil on the improvement. The machine tool in order to get a larger speed range, the use of double pumps in parallel oil form to get four kinds of ram movement speed. When the variable-speed slide valve 1 is in the position shown in Fig. 1a (ie, the first-stage speed), only 50 l / min of the oil pump is supplied with the pressure oil through the pipe k while the oil of the 100 l / Back pressure valve 2 back to the pool. The back pressure valve in addition to smoothing the movement speed ram, but also on the feed into the cylinder impact. When the back pressure valve to lower the pressure regulation, although the oil can be reduced