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按照邮电部门和农村低压用电线路的要求,需在6米至10米电杆上设置预留孔。设置预留孔对于振动成型的方杆或“I”字型电杆较容易,而对于离心成型的电杆就较麻烦。为此,我们作了不少模索,通过多种方法试验,最后采用在钢模上焊几对长35～40毫米、上端直径14毫米、下端直径16毫米的圆销(见图),圆销的距离及其尺寸是按邮电部门提出的要求确定的。制作时,工人只要在清理钢模时在销子上涂隔离剂或石蜡,蒸养后销子随同钢模一起脱出电杆。这样省
According to the requirements of the Ministry of Posts and Telecommunications and rural low-voltage power lines, reserved holes must be set on poles of 6 to 10 meters. It is easier to set the reserved hole for the vibration molded square bar or “I” shaped pole, and it is more troublesome for the centrifugally formed pole. To this end, we have done a lot of modelling, through a variety of methods, and finally welded on the steel mold several pairs of lengths 35 to 40 mm long, the diameter of the upper end of 14 mm, the diameter of the lower end of 16 mm round pins (see figure), round pin The distance and its dimensions are determined according to the requirements put forward by the post and telecommunications department. During the production, workers only need to apply spacers or paraffin on the pins when cleaning the steel molds. After steaming, the pins come out of the poles along with the steel molds. This province