Mechanical punching device for punching the tuyeres of a converter

A mechanical punching device for punching the tuyeres of a converter comprising:

• a mechanical puncher mounted on a movable carriage, said puncher positioned between two confronting side walls each of which is provided with a link mechanism, holding shafts extending through guide grooves in each corresponding side wall, and a punching rod driving cylinder, said link mechanism comprising two supporting shafts coupled to each corresponding side wall, two turning arms each of which has a bearing slot on each end portion and which is pivotally coupled at a point between the bearing slots to each of said two supporting shafts, link drive means having an end shaft, said two turning arms being coupled to each other through said bearing slots formed in first end portions thereof by said end shaft of said link drive means, said bearing slots formed in second end portions of said two turning arms being coupled to said holding shafts of said mechanical puncher which extend through guide grooves formed in said side wall.