China's robot makers showcased their latest machines at a Beijing conference on Wednesday, seeking to convince investors and customers that the technology is moving forward for broader commercial adoption.More than 300 companies are attending the World Robot Conference which runs through Sunday, displaying ?over 2,000 exhibits and ?launching more ?than 150 products, according to Beijing authorities.The conference comes as robotics emerges as a new front in the U.S.-China rivalry and as investor enthusiasm ?for the sector hits fresh highs in China.Shares in Unitree, China's best-known humanoid robot maker, soared nearly six-fold in their Shanghai trading debut ?on Wednesday.Robotics an 'important…