3results about How to "Realize choice" patented technology

The application relates to a microwave circuit band-stop filtering device based on an artificial magnetic conductor, and belongs to the fields of artificial magnetic conductors and filtering technologies, which solves the problem that a microstrip line causes electromagnetic interference on a circuit board and the surrounding environment in the prior art. The device comprises a shell and a microwave circuit board; the microwave circuit board is arranged in the shell, and a microstrip line is arranged on the microwave circuit board; an artificial magnetic conductor array is arranged on the lower surface of the top cover of the shell, the artificial magnetic conductor array is formed by arranging a plurality of same artificial magnetic conductor structure units, and is used for filtering electromagnetic interference caused by the microstrip line. The microwave circuit band-stop filtering device based on the artificial magnetic conductor is realized.

The utility model discloses a kind of damping devices with multi-section damping travel, including damping frame, pusher, damper and damping travel adjusting mechanism;The pusher includes first push block and second push block;The damping frame is respectively connected with first push block and second push block through first sliding structure between them, and it includes first slider and first sliding slot;The damping travel adjusting mechanism includes locking structure and travel selection mechanism;The locking structure includes multiple sets of first locking slot and first locking block;The travel selection mechanism includes bridge slider and travel selection drive mechanism;When first push block moves to the top of bridge slider, the bottom of first push block is supported by bridge slider;When first push block passes bridge slider, this first push block swings downward into corresponding first locking slot.This damping device of the utility model can realize the adjustment to damping travel, so as to be suitable for different application occasions.

The application provides a packaging bag film blowing system, which comprises a fan, a wind ring assembly and a discharge die head, the wind ring assembly comprises a base and an upper air disc, the base is installed on the discharge die head, the upper air disc covers the base, and a lower air lip is fixedly connected to the upper air disc; a main air channel is formed between the base, the upper air disc and the lower air lip, a lower air channel is formed between the base and the lower air lip, and the lower air channel communicates with the main air channel; a first upper air channel and a second upper air channel are arranged on the lower air lip, an annular groove is arranged on the lower air lip, a first air hole is arranged on the annular groove, a blocking ring is slidably installed in the annular groove, and a second air hole is arranged on the blocking ring; the application can solve the problem that the air port of the wind ring in the prior art is in an open state for a long time, dust in the air easily enters the inside of the wind ring device through the air port, the dust is blown to the film tube which has not been completely cooled by the cooling air, and the film quality is seriously affected.