Improvement of Main Baum Jig into VARI-WAVE Type in Ikeshima Colliery.

概要

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In order to increase the capacity and to obtain higher accuracy of separation the main Baum jig in Ikeshima colliery has been improved into a VARI-WAVE jig, which has been developed to create a desired wave pattern of pulsation. The existing rotary valve of mechanical type on each cell was replaced by an exhaust valve and two inlet valves to admit high and low pressure air. Each valve is driven by an air cylinder and an electromagnetic valve which is periodically operated by a controller. A set of new blower and air duct have been installed for a high pressure air supply while the existing system has been utilized for a low pressure air supply. The existing refuse ejector of gate type has been replaced by that of star wheel type whose speed is controlled automatically. One of the most distinct advantages offered by the improvement is an easy and prompt control of the pulsation. The wave height, the wave pattern and the period of pulsation became very easy to change and adjust. It has been found that the wave pattern of pulsation has a noticeable effect on the mobility and the separation of the particles. After the improvement the jig is operating successfully. The float-and-sink analysis of the product of the first bucket elevator shows that it can be expected to recover about 10, 000 tons of steam coal a year.
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