Machine for pulling monocrystals

Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Including specific material of construction

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156601, 156617SP, B01D 900

Patent

active

046005641

ABSTRACT:
The invention relates to a monocrystal pulling head.
A carriage carrying the vertical pulling spindle, in which is placed a weight transducer, moves parallel to said axis under the action of a torque motor, which is controlled in position and speed and which is directly connected to the threaded rod of a screw - nut system. During its displacement, the carriage is guided by a rail, on which roll at least two pairs of rollers. A torque motor is mounted in the carriage for directly rotating the pulling spindle. Thus, the spindle displacement speeds are very accurately controlled. An electronic system integral with the pulling spindle processes the signals from the weight transducer. Contactless means make it possible to supply the electronic system, feed the useful information to the fixed parts and return thereto control instructions.

REFERENCES:
patent: 2975036 (1961-03-01), Taylor
patent: 3934983 (1976-01-01), Bardsley et al.
patent: 4176002 (1979-11-01), Quenisset et al.
patent: 4190630 (1980-02-01), Apilat et al.
patent: 4218424 (1980-08-01), Floymayr et al.
patent: 4258003 (1981-03-01), Hurle et al.
patent: 4285911 (1981-08-01), De Brouckere
patent: 4539067 (1985-09-01), Washizuka et al.
Journal of Crystal Growth, vol. 41, No. 2, Dec. 1977, North-Holland Publishing Company.

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