Centralized sand supply system

The invention relates to a centralized sand supply system which comprises a transfer device (100) and a sand supply device (200). The sand supply device (200) comprises a driving mechanism (210) and a sand supply mechanism (220), the driving mechanism (210) comprises a mounting seat and a driving part, the mounting seat is slidably arranged on a mounting sliding rail (110) of the transfer device (100), the driving part and the sand supply mechanism (220) are both arranged on the mounting seat, the driving part is in driving connection with the mounting sliding rail (110), the driving part drives the mounting seat to move on the mounting sliding rail (110), and the sand supply mechanism (220) is used for supplying sand to equipment at different stations. According to the scheme, the problems that an existing sand supply system applied to a 3D printer is complex in switching process, high in operation difficulty and the like can be solved. 本申请涉及一种集中供砂系统，包括转运装置(100)和供砂装置(200)，所述供砂装置(200)包括驱动机构(210)和供砂机构(220)，所述驱