2results about How to "Achieve circumferential fixation" patented technology

The application relates to the technical field of mechanical precision detection, in particular to a rotating detection table for cross-roller bearing measurement, which comprises a shell, a fixed shaft fixedly connected to the bottom end of the shell, a V-shaped frame movably connected to the fixed shaft, a pull rod rotatably connected to the V-shaped frame, a supporting beam movably connected to the pull rod, a limiting plate fixedly connected to the upper end of the shell, a toothed plate slidably connected to the limiting plate, the toothed plate being fixedly connected to the supporting beam, a servo motor A fixedly connected to the upper end of the shell, the output end of the servo motor A being driven by a gear set to drive the toothed plate, a sliding rail fixedly connected to the bottom end of the shell, a servo motor B slidably connected to the sliding rail, a belt cylinder rotating shaft fixedly connected to the output end of the servo motor B, a friction belt fixedly connected to the belt cylinder, and a clasp fixedly connected to the friction belt. The V-shaped frame and the friction belt are used to prevent the outer ring from rotating circumferentially and moving eccentrically while ensuring the universality of the cross-roller bearing measurement, improve the rotating detection precision, and increase the height positioning function of the bearing axis.

The application discloses a kind of active noise cancellation device for ventilation duct, including ventilation duct and installation plate being arranged on ventilation duct, the ventilation duct includes first pipe and second pipe, the opposite side of the outer surface of first pipe and second pipe is all welded and fixed with butt joint frame, the both sides of installation plate are all penetrated and slidably installed with first L-shaped positioning frame, and the application relates to noise control technical field.The active noise cancellation device for ventilation duct provides the abutment of the abutment of two butt joint frames with the setting of two first L-shaped positioning frames, first rubber sleeve, first butt joint groove, installation plate and first fastening bolt, and provides fixing condition for detection box, to ensure that active noise eliminator is effectively used in ventilation duct, and cooperate with the setting of telescopic air cylinder, noise reduction frame and cover plate, when ventilation duct is not used, active noise eliminator can be isolated and protected by cover plate, to avoid the influence of dust on active noise eliminator.