在毛主席革命路线指引下,我公司广大职工在史无前例的无产阶级文化大革命中,遵照毛主席关于“自力更生,艰苦奋斗,破除迷信,解放思想”的教导,为满足三线建设的需要,自已设计试制了一种“81”轻型塔式起重机(图1)。这种起重机由于在卷扬、变幅、行走、迴转等方面采用了针齿摆线行星减速装置和用施工现场 Under the guidance of Chairman Mao’s revolutionary line, in the unprecedented proletarian cultural revolution, the staff of our company complied with Chairman Mao’s teachings on “self-reliance, hard work, breaking superstition, and emancipating the mind” to meet the needs of the third-line construction. A “81” lightweight tower crane was designed and manufactured (Figure 1). This kind of crane uses pin-tooth cycloid planetary speed reducers and construction sites for winding, luffing, walking and turning.