Telescopic multifunctional soot/gas sampling tube with adjustable length

The invention provides a telescopic multifunctional soot/gas sampling tube with an adjustable length, which can solve problems caused by unadjustable length during carrying, transporting and storing of the sampling tube. The technical scheme is that the sampling tube comprises a protection tube and a lengthening protection tube, wherein the lengthening protection tube is sleeved on the protection tube. The sampling tube is characterized by also comprising a locking head, a locking screw cap and a locking sleeve, wherein the locking sleeve and the locking head are sleeved on the body of the protection tube; the locking sleeve is sleeved in the cavity of the locking screw cap; the locking head is fixed with the front end of the lengthening protection tube; and the locking screw cap is connected with the locking head through threads. After the telescopic multifunctional soot/gas sampling tube with the adjustable length is used, a hose can be conveniently taken down, and after connecting and locking parts of the