"燧石发火装置" can be translated into English as "flint ignition device" or "flint fire-starting mechanism".
"Flint" refers to the hard, flinty stone used for striking fire.
"Ignition device" or "fire-starting mechanism" accurately describes the function of the apparatus, which is to initiate combustion.
Both translations are appropriate, with "flint ignition device" being more concise and commonly used in technical contexts.