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Explanation: Assuming from the context, I think "上下" denotes the same meaning as "昇降". For "上下させる" often means "昇降する" and, to my understanding, the sentence implies that the cylinder is used to lift up or down the heater head.
Hiroshi Nagaoka Local time: 04:39 Native speaker of: Japanese PRO pts in category: 8
Explanation: Four oil-hydraulic, double-acting cylinders, of forged steel, are placed on the .... It consists of a welded steel frame containing a hydraulically operated double-acting cylinder. ... This heater comes complete with loading and unloading equipment. ... billet head and tail 100°C. -installed electric power 700 KW ... www.servaasfactories.com/pictures/4000 MT Extrusion Line Te...
V N Ganesh Local time: 01:09 Specializes in field Native speaker of: English PRO pts in category: 202