Injection device

The embodiment of the utility model provides an injection device, including shell, calibration loop, shot adjustable ring, push rod and regulation transmission cover, when using, install the injectant container at the output of shell, the push rod contacts the impetus of injectant container, rotate the shot adjustable ring, will drive the calibration loop and adjust the transmission cover and upwards slide, and that the calibration loop makes progress is gliding apart from kL (k&gt, 1 )Be greater than adjust the transmission cover make progress gliding apart from L, and the transmission cover to make progress gliding distance be actual shot, then can be on the calibration loop the set out scale of crypto set of mint -mark to improved the precision, also can increase the digit or the alphabetical size of mint -mark on the calibration loop, thereby make things convenient for the old man to use, in when injection, exert the calibration loop, the calibration loop with adjust the transmission cover can the lapse,