Growth early-stage control method of automatic photoelectric crystal furnace

Abstract

The invention relates to a growth early-stage control method of an automatic photoelectric crystal furnace. The automatic photoelectric crystal furnace comprises a furnace body, a lifting rod, a heating module, a temperature measuring module, a temperature control module, a lifting module, a rotating module, a monitoring module and a control system. The method comprises the following steps: heating and smelting furnace body crystal materials; using the lifting rod for feeding crystals so that seed crystals on the lifting rod can go under the liquid level of the furnace body; entering a next step when the liquid absorbs the seed crystals; lifting and rotating the lifting rod to enter the neck reduction process; using the monitoring module for reading the weight of the rest seed crystals in the furnace body; lowering the heating temperature when the monitored crystal growth speed rate is a negative value; raising the heating temperature when the monitored crystal growth speed rate is a great positive value; completing the neck reduction process when a neck reduction part reaches the preset length; improving the growth speed rate of the crystals so that the diameter of the crystals becomes larger from a small value until the preset crystal diameter is reached; and completing the growth early stage.

Description

technical field [0001] The invention relates to a method for controlling the pre-growth stage of an automatic photoelectric crystal furnace. Background technique [0002] IOLs are playing an increasingly important role in the fields of science and technology and industrial production, and the preparation equipment and technology of IOLs have become an important bottleneck restricting the production and quality of IOLs. The most advanced artificial crystal preparation technology is in the hands of developed countries such as the United States and Germany, and the corresponding equipment has a high degree of automation and is easy to achieve mass production. However, its high price discourages domestic enterprises and scientific research institutes. There are a few companies in China that can also provide IOL preparation equipment, but there are often problems such as low degree of automation, excessive reliance on operator experience, and low yield in mass production. [00...

AI Technical Summary

Problems solved by technology

The traditional process relies too much on the personal experience of the operator, it is difficult to realize the automation of the process, and it is even more difficult to promote it on a large scale

Due to the small observation window of the heat preservation cover, the operator's view of the furnace body is greatly limited, and it is difficult to accurately judge the situation inside the heat preservation cover

Moreover, the observation window on the heat preservation cover will seriously affect the temperature field distribution in the heat preservation cover, causing greater uncertainty to the crystal growth.