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1. A three-phase power supply and collection device for a maglev train, comprising power supply rails, collector shoes and cables, wherein a cross beam is arranged at a middle part of a bogie of the maglev train, and a lower surface of the cross beam is provided with three sets of longitudinal bearing seats on the left, middle and right sides; a left insulating bush, a middle insulating bush and a right insulating bush are provided, corresponding to the longitudinal bearing seats, wherein each insulating bush is a T-shaped structure, the two ends of the horizontal part of the insulating bush have a structure of rotating shaft and are fixed to the bearing seat via a bearing respectively, and the vertical part of the insulating bush is a hollow tubular structure; a left collector shoe, a middle collector shoe and a right collector shoe are provided, corresponding to the left insulating bush, the middle insulating bush and the right insulating bush, wherein each collector shoe is a conductor and generally is an inverted T-shaped structure, an upper vertical part of the collector shoe is a shoe handle of the collector shoe, a lower horizontal part of the collector shoe is a shoe body of the collector shoe, and a lower surface of the shoe body is a concave semicircular contact surface; three power supply rails are provided corresponding to the collector shoes, including a left power supply rail, a middle power supply rail and a right power supply rail, wherein a top surface of each power supply rail is convex semicircular contact surface, and a bottom of the power supply rail is fixed on an insulated track bed; the left power supply rail, the middle power supply rail and the right power supply rail are respectively connected with three-phase power supply, and their contact surfaces contact with the contact surfaces of the left collector shoe, the middle collector shoe and the right collector shoe respectively to collect power; the shoe handle in clearance fit with the vertical part of the hollow insulating bush is a cylinder, and a top end of the shoe handle is connected with a cable, which passes through the vertical part of the insulating bush and is led out from a top end of the insulating bush and connected with a three-phase converter on the maglev train; the three-phase power supply provides power to the three-phase converter of the maglev train via the power supply and collection device composed of power supply rails, collector shoes and cables.
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