The flip-type countercurrent cooling dryer is borrowed from the drying process section in the feed industry. It was originally used for drying various pellet feeds, such as pellets, expanded materials, expanded materials, and tableted materials. It is especially suitable for expanded and expanded materials. dry. It is currently used in the countercurrent drying of puffed materials in the oil industry. In this specification, the flap type countercurrent cooling dryer (improved type) is hereinafter referred to as "countercurrent cooler".

The dryer is mainly composed of base, top cover, spreader, drying bin, unloading device, hopper and other main components. The product adopts a vertical overall layout with a simple and beautiful appearance; advanced countercurrent drying principle, a swing-type flap unloading mechanism controlled by a flexible hydraulic transmission system, smooth discharge, adjustable discharge flow and speed, and uniform discharge volume; cross-section The octagonal drying chamber eliminates the drying dead angle, which is beneficial to the drying treatment of the material; the new rotary spreader ensures that the material is fully and evenly and thoroughly dried and can significantly reduce the breakage rate, the distribution range is adjustable, and the power consumption is small; After drying, the material temperature is not higher than room temperature + 5°C, and the precipitation rate is not lower than 3.8%, which prolongs the storage time of high-quality pellet feed; an inspection door is opened on the front of the equipment to facilitate daily maintenance and repair. There are several observation windows on the side and the top cover, which is convenient for observing the operation status of the equipment.

How Counterflow Coolers Work

The hot and humid materials enter the drying bin through the closed air feeder or the air shutoff device, and are evenly spread on the multiple flaps arranged in parallel under the action of the material spreading mechanism. When the materials accumulate to a certain height, the materials on the bin The positioner senses the material level information and sends a signal immediately, so that the hydraulic cylinder pushes the crank linkage mechanism to move, the flaps rotate around their respective axes, and the materials begin to fall from the gaps between the flaps and flow into the discharge hopper evenly; When a set angle is reached, the flag lever of the flap opening will touch the micro switch, and the hydraulic system will act through the valve to stop the hydraulic cylinder, stop the flap at the preset position, continue blanking, and the time relay will work. After a certain setting After a while, the hydraulic cylinder will work again, and the flap will return to its original position, the material will no longer fall, and a discharge cycle will be completed. If the material is re-accumulated to the height of the level gauge, the level gauge will send out a signal to repeat the above unloading process. Throughout the above process, the drying fan is always on.

The cold air (or hot air, according to the local humidity) is from bottom to top; the material gradually descends, from wet to dry (the principle of countercurrent drying). The hot material in the upper part of the drying chamber encounters hot air with high humidity, while the material in the lower part encounters cold air with low humidity, so that the material is evenly and fully dried and cooled to a certain temperature (controllable) during the downward process, ensuring product quality.