Chromatographic instrument sample injection spacer replacement structure

The utility model discloses a chromatograph sample injection spacer replacement structure which comprises a sample injection head, a sample injection cap is arranged on the outer side wall of the upper end of the sample injection head in a threaded mode, an installation groove is formed in the upper side wall of the sample injection head and communicated with the interior of a sample injector through a sample injection channel, and a plurality of first vertical sliding grooves are formed in the lower side wall of the installation groove. A limiting groove is formed in the bottom side wall of the first vertical sliding groove, the limiting groove is communicated with the multiple first vertical sliding grooves, a limiting block is arranged in the limiting groove in a sliding mode, multiplesprings are fixedly arranged on the upper side wall of the limiting block, and the multiple springs penetrate through the multiple first vertical sliding grooves and extend into the mounting groove; mounting blocks are fixedl