The invention relates to a mini size automatic vending
machine which is arranged in an office or a canteen; particularly, the slot device used in the mini size automatic vending
machine for supplying coffee and the beverage is improved in the mini size automatic vending
machine of the invention; the invention provides a low-price mini size automatic vending machine with low price and the improved structure; besides, an
electronic temperature sensor is arranged in the heating box to measure the temperature accurately, so as to control the interior temperature of the heating box properly; furthermore, spherical check valves are respectively arranged on the
water supply pipe which connects the water tank with the heating device, and the pipeline which connects the heating box and the water tank; the spherical check valves can prevent the hot water in the heating box from flowing back to mix with the cool water in the water tank and provide a structure of improving the temperature of the hot water in the heating box; meanwhile, the vapor generated in the heating box can be exhausted to solve the problem of low
discharge speed of the hot water when the hot water valve is opened; besides, the stirrer and the
impeller are improved to prevent the splashing situation; the
dilution operation becomes easy; the tastes of the coffee and the domestic tea are improved.