Improved waste gas analyzer

The utility model discloses an improved waste gas analyzer. Box body, sliding grooves are formed in the tops and the bottoms of the two sides of an inner cavity of the box body. Sliding blocks are slidably connected to inner cavities of the sliding grooves. A clamping plate is fixedly connected between the two sliding blocks; fixing frames are fixedly connected to the two sides of the top and thetwo sides of the bottom of an inner cavity of the box body. A limiting rod and a first spring are fixedly connected to the bottom of an inner cavity of the fixing frame, the surface of the limiting rod is sleeved with the first spring, an ejector block is slidably connected to the top of the fixing frame, and the top of the limiting rod penetrates through an inner cavity of the ejector block and is slidably connected with the ejector block. Through cooperative use of the box body, the sliding grooves, the sliding blocks, the clamping plates, the fixing frames, the limiting rods, the first springs, the ejector blocks,