四、采用什 么型式的人 字门启闭机 根据多年的使用经验,人字门启闭机有四种较好的型式:用齿条直接拉在门上,用电动机,减速器和齿轮带动齿条的启闭机,简称齿轮齿条式。用液压缸的活塞杆直接拉在人字门上的启闭机,简称液压缸式。由电动机、制动器、限位开关、初级和第二级减速器、扇形齿轮、曲柄和连杆组成的启闭机,简称电力驱动式,如图2所示。用水平液压缸的活塞 Fourth, what type of gable gate hoist According to years of experience, gable gate hoist has four types of better: pull directly on the door with a rack, with a motor, reducer and gear driven teeth The hoist, referred to as rack and pinion. Hydraulic cylinder piston rod pulled directly on the Mito on the hoist, referred to as the hydraulic cylinder. The hoist composed of a motor, a brake, a limit switch, a primary and a second speed reducer, a sector gear, a crank and a connecting rod is referred to as an electrically driven type, as shown in FIG. 2. Use a horizontal cylinder piston