Abstract: Provided is a transfer vehicle, including: a vehicle body; a rotating mechanism, including an annular track vertically arranged above the vehicle body, a crawler belt arranged along an end surface of the annular track, and a first driving device connected to the crawler belt; a plurality of material receiving rods arranged at intervals on a side of the rotating mechanism, wherein each material receiving rod includes an inner rod and an outer rod sleeved on the inner rod, and the inner rod is connected to the crawler belt; a docking auxiliary mechanism arranged beside a docking station on the side of the rotating mechanism, including a pushing device and a positioning device, wherein the positioning device is configured to determine an orientation of a target docking position; and a control mechanism configured to control movement of the vehicle body.

Abstract: A coaxial loudspeaker with a horn and a shape optimization method therefor are provided. The coaxial loudspeaker includes: a woofer unit; a tweeter unit; and a horn having an inner cavity, an open upper end and an open lower end. The tweeter unit comprises a high-pitch cone, the horn surrounds the high-pitch cone, a lower end portion of the horn is connected to the tweeter unit, and an upper end portion of the horn has the largest inner diameter.