1. Spring spiral cargo lane, easy to maintain, can sell different types of goods.
2. Regarding the card goods, the problem of retreating money:
(1) A series of detection and shipping mechanisms have been added to the software. If the payment is successful, but the software does not receive the motor rotation feedback, the software will be driven again.
(2) A light inspection board with infrared detection is added to the hardware. If the payment is successful, but the infrared light inspection board detects the goods, it is automatically refunded to the customer.