Crystal pulling apparatus for the production of heavy crystals by Czochralski method, comprises crystal hub- and rotating device by which the crystal is pulled at its neck hanging from a melt, and crystal support device having a base body

摘要

The crystal pulling apparatus for the production of heavy crystals by Czochralski method, comprises a crystal hub- and rotating device by which the crystal is pulled at its neck (4) hanging from a melt, and a crystal support device having a lifting base body (1) freely lowerable and coupled with the crystal hub- and the rotating device. The neck has an upper thinner area, a lower thinner area and a bulge (10) arranged between the upper and the lower thinner areas. Two handles (7) are positioned on the base body in such a way that they are able to pass the bulge into a working position. The crystal pulling apparatus for the production of heavy crystals by Czochralski method, comprises a crystal hub- and rotating device by which the crystal is pulled at its neck (4) hanging from a melt, and a crystal support device having a lifting base body (1) freely lowerable and coupled with the crystal hub- and the rotating device. The neck has an upper thinner area, a lower thinner area and a bulge (10) arranged between the upper and the lower thinner areas. Two handles (7) are positioned on the base body in such a way that they are able to pass the bulge into a working position in which the handles are fastened beneath the bulge. Each handle is arranged around a rotating axis (8) revolving at the base body, which has a stop for determining the resting position and the working position. The base body is a ring surrounding the neck. The handles are uniformly arranged on the circumference by the ring and are bringable from the resting position to the working position by an actuator arranged at a housing of the apparatus. A part of the handle is implemented as a rod (9) that protrudes in the resting position radially outward over the edge of the crystal. The rod cooperates with the actuator, which is arranged in the area of the apparatus. The actuator is implemented as poles that pass tangential to the crystal and that exist itself within a moving direction of the rod. The poles are foldably held at the housing and the handles are bringable to a horizontal position of the apparatus by the poles for the manipulation. The apparatus has means by which the rotating motion of the hub and the rotating device are controllable and synchronizable. The further hub- and rotating device are arranged over a load sensor and a torque sensor. Independent claims are included for: (1) a support device for crystal pulling apparatus; and (2) Czochralski method for the production of heavy crystals.