Logging instrument and measurement-following jam freeing device thereof

The utility model relates to the technical field of logging instruments, in particular to a logging instrument and a measurement-following jam freeing device thereof. Compared with the prior art, the unfreezing device during testing is provided with more than three backup plates, when the unfreezing device is used, large enough supporting force can be provided, unfreezing work of the unfreezing device is facilitated, after the more than three backup plates are adopted, installation of the unfreezing device is limited, and therefore in the scheme, the installation base is assembled on the backup piston rod in a rotating mode, and during installation, the backup cylinder is assembled firstly, and then the backup piston rod is installed on the installation base. The mounting base is assembled on the pushing piston rod, the pushing arm at the lower end of the pushing plate is assembled on the mounting base, and the mounting base can rotate, so that the position of the pushing arm can be conveniently adjusted in t