28-04-2023 дата публикации
Номер: CN116021651A
Принадлежит:
The invention provides a preformed hole opening device for a concrete prefabricated component, a tight abutting assembly comprises a baffle, a tight abutting plate, a first convex block, a second convex block, a push rod, a telescopic rod, an extension rod, a sleeve and a rotating sphere, the baffle slides on the inner side of a lining plate, and the tight abutting plate slides at the lower end of the side, away from the lining plate, of the baffle; the first protruding block and the second protruding block are slidably nested at the lower end of the abutting plate, the push rod slides between the first protruding block and the second protruding block, the telescopic rod is slidably nested at the upper end of the abutting plate, the sleeve is arranged on the side, close to the baffle, of the abutting plate, the inclined plate is extruded to the sliding plate at the lower end of the sleeving frame again, and the sliding plate reversely slides in the sleeving frame. At the moment, the sleeving ...
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