Coffee and Cereal Dryer with Double Central Screw Stirrer System

Description

/ 6 Coffee and Cereal Dryer with Stirring System and Double Central Screw FIELD OF THE INVENTION

[01] The present invention describes a CEREAL COFFEE DRYER WITH A DOUBLE CENTRAL SCREW STIRRING SYSTEM, intended for the agricultural area and equipment, specifically for coffee growing, in the technological sector of grain drying. Aimed at improving the quality of grains that require drying by equipment. The present solution seeks to meet the specific criteria for drying coffee beans, market demands, the scarcity of quality equipment, and the demand from producers. STATE OF THE ART

[02] Around the world, people are increasingly loving coffee. Whether at home, in the office, or in various social situations, people are drinking coffee, which is gradually becoming associated with fashion and contemporary life. During the processing of coffee beans, the coffee beans need to be dried.

[03] The current facilities for drying coffee are not entirely satisfactory, as the moisture is not completely removed and, above all, this removal is not uniform throughout the processed product. It is possible to find static, rotary, vertical, and even solar-powered dryers, as can be seen in the examples below:

[04] Patent CN210980679 describes the technical scheme of a model comprising a drying funnel and is characterized by also including a set of solar hot air devices, and the set of solar hot air devices is connected to an induced draft fan and a heat exchanger via a heat pipe. The heat exchanger device communicates Petition 870250074115, dated 08 / 21 / 2025, page 8 / 17 / 6 with the lower part of the drying hopper through a circulating fan at the bottom; a mixer is arranged in the center of the drying hopper and an air duct is separated at the bottom by a grid plate; the hot air solar device array is composed of a series of hot air devices and heat pipes connected in series in several groups and connected in parallel in the vertical direction.

[05] Patent FR2198701 comprises a coffee drying installation, operating continuously, essentially characterized by a treatment chamber in which parallel vertical panels with horizontal gel slits delimit narrow passages through which the coffee descends by gravity, in thin layers traversed by hot drying air while the beans are constantly moved, these same panels also delimit ascending passages for the hot air, which alternate with descending passages for the coffee.

[06] Utility model BR 202017025075-5 U2 comprises a semi-static coffee dryer consisting of a ventilation system and ducts, furnace and hot air pipes, hexagonal plenum chamber, electronic thermostat, straw feeder, auger, central bucket elevator in a semi-static coffee bean drying system that allows drying to occur first statically in a heat induction process and then, and periodically, in a circulation process in the plenum chamber.

[07] Patent BR 102014030930-6 A2 summarizes a coffee dryer with internal air injection and drying process. It is equipment consisting of a process for drying coffee beans, which does not contain mechanical devices, formed by an air box; inlet piping; air inlet valve; coffee dryer with internal air injection; perforated bottom; Petition 870250074115, dated 08 / 21 / 2025, p. 9 / 17 / 6 hot air intake turbine; air heating furnace; winch; supply elevator; auger shaft; electronic scale and hydraulic jack.

[08] Patent BR 102016005034-0A2 describes a horizontal trench-type dryer for coffee or other agricultural grains. The equipment works with an airflow originating from an underground tube, which leads to perforated bottom channels with holes smaller than agricultural grain, which is subsequently distributed throughout, passing through the mass of grains, following a direction from bottom to top, with air exiting through the top of the grain mass. Also part of the same is a semi-automatic grain turning machine that travels throughout the trench by adjusting levers that position the augers moved by an electric motor, which causes the product (coffee) to be turned from bottom to top.

[09] Patent PI0902065-9 A2 comprises a vertical tray dryer for coffee and similar products. It is a tray drying equipment applied to grains and seeds, which uses forced ventilation and movement of the product by gravity and vertical elevation interspersed with rest periods to allow the migration of moisture from the interior of the grain.

[010] However, none of the prior inventions resemble the present invention.

[011] The present invention provides better uniformity of grain drying; energy savings; savings in firewood and straw; savings in labor time for drying; lower cost of parts replacement compared to other mechanical dryers; shorter drying time; easy handling; easy maintenance; possibility of drying coffee with high moisture content, grains coming directly from the field, without passing through the drying yard, thus avoiding natural weather conditions; in addition Petition 870250074115, dated 08 / 21 / 2025, page 10 / 17 / 6 of having the advantage of drying small and large quantities of coffee, without interfering with the quality and consumption of the drying process. LIST OF ATTACHED DRAWINGS

[012] In order for the present model to be fully understood and put into practice by any technician in this technological sector, it is described in a clear, precise and sufficient manner, based on the attached drawings listed below: Figure 1 - Top view of the coffee dryer. Figure 2 - Side view of the coffee dryer. Figure 3 - Front view of the coffee dryer. DETAILED DESCRIPTION OF THE INVENTION

[013] The present invention consists of two vertical semi-cylinders, 4.50m (length) x 2.50m (width) x 3.60m (height), manufactured from interconnected steel sheets. These two cylinders form a large silo that is internally subdivided. (Figure 01). Being (01) silo 4.5 m long x 2.50 m wide x 3.6 m high, (02) access door to the interior, (03) maintenance / access platform to the silo; (04) platform guardrail, (05) platform ladder, (06) stirrer support, (07) 7.5 hp open stirrer motor, (08) upper screen, (09) lower screen, (10) iron pulley of the stirrer screw, (11) conveyors and (12) motor support. Inside each semi-cylinder there is a vertical stirrer with helical blades that acts as a screw conveyor for the grains.

[014] Inside each cylinder there is a perforated sheet metal funnel where the grains are housed. The central screws that move the grains are driven by a 7.5hp motor, which rotates the screws (07) through a Petition 870250074115, dated 08 / 21 / 2025, page 11 / 17 / 6 transmission system consisting of pulleys that connect to belts (11). The transmission system is located on the upper part of the cylinders (10).

[015] On the outside of the silo, there is a door that gives access to its interior, so that its internal portion can be cleaned. (02). For maintenance of the invention, there is a ladder (05) that gives access to the maintenance platform (03). Following safety measures, the platform is protected by a guardrail (04). In addition, there is a key to activate the motor of each semi-cylinder.

[016] At the bottom of the hoppers there is a gate through which the grains are discharged. These grains fall into the bottom of a conveyor, which transports them to the storage area. The conveyor consists of a bucket elevator, which serves both to load and unload grains.

[017] Also on the outside there is a thermometer, to measure the temperature of the air entering the dough and there is a thermostat to regulate the temperature of the air entering the dryer.

[018] The complete set consists of: dryer; furnace; turbine; elevator for loading and unloading, straw feeder, thermometer and thermostat.

[019] The air is heated indirectly in a furnace, and is channeled to the air chamber on the side of the dryer.

[020] The furnace has a turbine that blows cold air into the heated duct, raising the temperature of the air that goes towards the dryer's air chamber.

[021] The drying process is carried out in a single piece of equipment with fixed layers where the constant flow of hot air causes the mass to preferably reach a moisture content of 12%. Petition 870250074115, dated 08 / 21 / 2025, p. 12 / 17 / 6

[022] The upper part contains the grains and the stirrer, and the lower part contains the hot air chamber, where air circulates under pressure to pass through the mass of grains, thus drying them.

[023] The entire mass of grains in the upper part is moved through the central screw of the mixer, ascending through its helical blades, which promotes the homogenization of the grain mass and significantly increases the efficiency of drying. Petition 870250074115, dated 08 / 21 / 2025, p. 13 / 17

Claims

1 / 2 CLAIMS 1 - Coffee and cereal dryer characterized by being substantially as shown in the attached figures and consisting of the following assembly: dryer; furnace; turbine; elevator for loading and unloading, straw feeder, thermometer and thermostat. 2 - Coffee and cereal dryer, according to claim 1, characterized by having in its structure: a door that gives access to its interior (Figure 1. Caption 02); a ladder (Figure 3. Caption 05) that gives access to the maintenance platform (Figure 3. Caption 03); a guardrail (Figure 3. Caption 04). 3 - Coffee and grain dryer characterized by being made up of two vertical semi-cylinders, 4.50m (length) x 2.50m (width) x 3.60m (height), manufactured from interconnected steel sheets. 4 - Dryer, according to claim 1, characterized by containing a mixing system with a double central screw with helical blades. 5 - Dryer, according to claim 1, characterized by having central screws that move the grains driven by 7.5 hp motors (Figure 1. Caption 07) through a transmission system consisting of pulleys that connect to belts (Figure 1. Caption 11). 6 - Dryer, according to claim 1, characterized by containing an air chamber that receives hot air from the furnace. 7 - Dryer, according to claim 1, characterized by having a turbine that blows cold air into heated piping and subsequently into the air chamber. Petition 870250015242, dated 25 / 02 / 2025, p. 13 / 19 2 / 2 8 - Loading and unloading elevator, according to claim 1, characterized by being constituted by a bucket elevator, which serves both to load and unload grains. 9 - Drying process characterized by being carried out in a single piece of equipment with fixed layers where the constant flow of hot air causes the mass to preferentially reach a moisture content of 12%. Petition 870250015242, dated 02 / 25 / 2025, p. 14 / 19

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