Metal working – Barrier layer or semiconductor device making
Patent
1992-07-30
1994-06-28
Kunemund, Robert
Metal working
Barrier layer or semiconductor device making
414146, 414DIG3, 414DIG6, 376183, G21C 1922, G21G 102
Patent
active
053243315
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention pertains to a transport system for transporting containers through a reactor basin. More particularly, the invention relates to a transport system for transporting containers or products within and along an essentially vertical tube, such as containers packed with semiconductor monocrystals, with concurrent rotation of the containers on the axis of the tube. Such a transport system is used, e.g., in research reactors, in which silicon monocrystals are doped with phosphorus by neutron bombardment. Therein, the silicon crystals are arranged in containers, which are transported along and within a vertical tube traversing the heavy water tank of the reactor basin. In order to achieve the most uniform radiation possible, the containers are also rotated on the axis of the tube. This is accomplished, e.g., by means of a long rod, to which the containers are affixed and then pushed through and rotated within the tube.
Such transport systems can also be used, e.g., in bioreactors or in galvanizing facilities. Due to the limited space usually available, care must be given to space-saving construction in all applicatory possibilities. In particular, the aggressive environment, which is partially dependent upon the reason for the treatment, e.g., radioactivity or aggressive liquids, dictates a sensible selection of the materials employed and a construction, which is as simple as possible, easy to maintain, and long-lived.
In the case of the aforementioned doping of semiconductor crystals in a reactor, the possibility should also be given for executing this doping as uniformly as possible and continuously, i.e., that each container passing through the reactor is subjected to approximately the same radiation conditions, and that a high feed capacity is nevertheless attained.
SUMMARY OF THE INVENTION
Fundamental to the invention is an objective of so designing a transport system of the type in question that a high feed capacity is attained with simple construction, and that the transport system can also be employed in aggressive environments.
Accordingly, the transport system consists of three units, namely a rotary tube, a worm sleeve, and the containers transported In the rotary tube and the worm sleeve. The rotary tube, in which the containers are non-rotatably retained, is responsible for the rotary movement of the containers, while the worm sleeve is responsible for the transport of the containers along the axis of the tube. The gliders of a container within the worm sleeve engage in and are tightened into the screw threads of the worm sleeve, since the rotational movement of the rotary tube is imparted by couplings between the containers. Following the passage of a given container through the worm sleeve, it is accepted by a receiver and optionally transported further.
When containers holding silicon crystals are to be transported through the heavy water tank of a reactor, the rotary tube and the worm sleeve are themselves contained within a passage tube through the heavy water tank. The rotary tube can be rotatably supported on a shoulder of the passage tube, while it is preferred for reasons of safety that use be made of a support at the bottom of the rotary tube, which extends out from the base of the reactor basin.
The described transport system makes possible the continuous transport of a progression of containers along the rotary tube and the worm sleeve. In the radiation of silicon monocrystals in a reactor, assurance is given thereby that all of the crystals are continuously radiated in the same manner.
For other applications, it is necessary that the tubes and the containers be made of uniform material; e.g., for the transport of products through galvanizing baths, it is essential that the individual components of the conveyor system be made of a mesh material, so that the galvanizing liquid can also reach the interior of the containers, It is also possible that a product to be transported be placed directly into the rotary tube, provided care is taken to ensur
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patent: 5048164 (1991-09-01), Harima
Kunemund Robert
Ojan Ourmazd S.
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