The transfer track receives the material from the esec outlet, moves to the corresponding conveyor belt, transfers to the conveyor belt, and transfers to the rightmost end through the conveyor belt. At the same time, the first transfer track moves to the conveyor track to dock with it, and the product is transferred from the conveyor belt to the first track The transfer track moves to the buffer and transfers to the corresponding track on the buffer. The ransfer returns to continue to receive the material, and the product is transferred into the reflow oven through the buffer (the first product is directly transferred from the transfer track to the buffer into the reflow oven)