Internal expansion type telescopic device for vertically pressing pressing rod

The utility model discloses an internal expansion type telescopic device for vertically pressing a pressing rod. Bottom plate, a positioning plate is arranged on the bottom plate; a fixed seat is arranged on the positioning plate; a belleville spring is arranged between the fixed seat and the bottom plate; a matched mandrel is arranged in the center of the bottom plate, a rotatable cam and a fixing base side wall pressing rod sleeve are arranged on a center shaft of the fixing base, a stop screw is arranged on the pressing rod sleeve, a pressing rod is arranged in the pressing rod sleeve, a cover plate is arranged above the cam, the mandrel further comprises a pressing nut vertically penetrating through the cover plate, and the mandrel located above the cover plate is provided with the pressing nut. The groove in the side surface of the inner hole of the part is utilized; when the clamping device is used, the multiple pressing rods are synchronously and horizontally pushed out throughthe cam in the device, th