B　220重型龙门刨床的刀夹部分重　50多公斤,虽有电磁抬刀机构,但抬高度只有10mm。左右,因此在切削T型槽、直槽及创导轨下滑面时仍需工人在退刀时用撬杠抬刀,劳动强度很大,又很不安全。我们在大修该机床时为其设计制造了一种液压抬刀装置,能使抬刀高度增加到90多mm.满足了使 B 220 heavy gantry planer part of the folder more than 50 kilograms, although the electromagnetic lift knives, but the elevation of only 10mm. Therefore, workers still need workers to lift the knife with a crowbar when they cut the T-shaped groove, the straight groove and the guide rail under the sliding surface, which is labor-intensive and unsafe. When we overhauled the machine, we designed and built a hydraulic lifting device that increased the lifting height to more than 90 mm.