A ball reflow component, comprises: a ball cage comprising a long groove , a plurality of first recessed portions , a plurality of second recessed portions , a first side portion , and a second side portion corresponding to the first side portion , wherein the plurality of first recessed portions are arranged on the first side portion , and the plurality of second recessed portions are arranged on the second side portion ; a first end cover assembled on the first side portion of the ball cage , wherein the first end cover comprises a first curve and a plurality of first protruding portions , one of two ends of the first curve corresponds to one of two ends of the long groove , and the plurality of first protruding portions are correspondingly arranged in the plurality of first recessed portions ; and a second end cover assembled on the second side portion of the ball cage , wherein the second end cover comprises a second curve and a plurality of second protruding portions , one of two ends of the second curve corresponds to the other end of the long groove , and the plurality of second protruding portions are correspondingly arranged in the plurality of second recessed portions characterized in that : two opposite end portions of the long groove are respectively provided with a first guide groove and a second guide groove , the first guide groove is curvedly connected to the first curve , and the second guide groove is curvedly connected to the second curve ; wherein the first guide groove and the second guide groove extend in a direction deviated from a length direction of the long groove . a ball cage comprising a long groove , a plurality of first recessed portions , a plurality of second recessed portions , a first side portion , and a second side portion corresponding to the first side portion , wherein the plurality of first recessed portions are arranged on the first side portion , and the plurality of second recessed portions are arranged on the second side portion ; a first end cover assembled on the first side portion of the ball cage , wherein the first end cover comprises a first curve and a plurality of first protruding portions , one of two ends of the first curve corresponds to one of two ends of the long groove , and the plurality of first protruding portions are correspondingly arranged in the plurality of first recessed portions ; and a second end cover assembled on the second side portion of the ball cage , wherein the second end cover comprises a second curve and a plurality of second protruding portions , one of two ends of the second curve corresponds to the other end of the long groove , and the plurality of second protruding portions are correspondingly arranged in the plurality of second recessed portions characterized in that : two opposite end portions of the long groove are respectively provided with a first guide groove and a second guide groove , the first guide groove is curvedly connected to the first curve , and the second guide groove is curvedly connected to the second curve ; wherein the first guide groove and the second guide groove extend in a direction deviated from a length direction of the long groove . two opposite end portions of the long groove are respectively provided with a first guide groove and a second guide groove , the first guide groove is curvedly connected to the first curve , and the second guide groove is curvedly connected to the second curve ; wherein the first guide groove and the second guide groove extend in a direction deviated from a length direction of the long groove . <EOS>