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Method for improving surface quality of inner and outer rings and edge parts of oriented silicon steel and annular furnace

The invention discloses a method for improving the surface quality of inner and outer rings and edge parts of oriented silicon steel and an annular furnace. In a primary cold rolling process, misalignment crimping is adopted, crimping tension is controlled according to gradual change tension, the crimping tension at the head and the tail is large, and the crimping tension at the middle part is small; the coating amount of MgO and the curling tension change synchronously, the coating amount of the head and the tail is small, and the coating amount of the middle part is large; in the high-temperature annealing process, a cushion layer formed by evenly distributing a plurality of fan-shaped blocks around the center is additionally arranged on a bottom plate of the annular furnace, gaps exist between the adjacent fan-shaped blocks, and the upper end of a steel coil in an inner cover of the annular furnace is covered with a ventilated cover plate. An inner ring gap of the bottom surface of the cover plate extends into a steel coil hole, an outer ring gap sleeves a steel coil, the middle of the cover plate is supported on the end surface of the steel coil through diversion trenches uniformly distributed around the center, the diversion trenches are spiral, inlets of the diversion trenches are communicated with openings in the inner ring of the cover plate in a one-to-one correspondence manner, and outlets of the diversion trenches extend to the inner side of the outer ring of the bottom surface of the cover plate. The method can obviously reduce surface defects, obviously improve surface quality and magnetism, and is easy to operate.
Owner:武汉钢铁有限公司

Breathing apparatus

[Object of the Invention] An object of the present invention is to provide a breathing apparatus comprising a face piece for covering the whole face or part of the face provided with a hole at each side portion, a motor fan for supplying the face piece with external air, a pressure sensor for monitoring internal pressure of the face piece, a controller for controlling the operation of the motor fan based on a detection signal from the pressure sensor, a filter for purifying the external air supplied to the face piece, and an inhale valve and an exhale valve, wherein filter consumption is minimized.[Disclosure of the Invention] A breathing apparatus comprises a face piece for covering the whole face or part of the face provided with a hole at each side portion, a motor fan for supplying the face piece with external air, a pressure sensor for monitoring internal pressure of the face piece, a controller for controlling the operation of the motor fan based on a detection signal from the pressure sensor, a filter for purifying the external air supplied to the face piece, and an inhale valve and an exhale valve, wherein a positive pressure exhale valve is attached to one of the holes at the side portions of the face piece and a positive pressure exhale valve or a voice conductor is attached to the other of the holes at the side portions of the face piece.
Owner:SHIGEMATSU WORKS CO LTD
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