Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
  • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
  • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
  • F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
  • F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum
  • F26B11/0486—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum the elements being held stationary, e.g. internal scraper blades

Definitions

• the present invention is a drying machine for the drying of vegetable and mineral materials which can be rinsed, for example, corn, and is of the type comprised for the most part of a horizontal drying section which rotates on its own longitudinal axis and through which hot air is led. It is constructed in such a way that when the section rotates, the material passes through it from one end, the inlet end, to the other end, the discharge end, with or against the drying air.
• Such machines produce the heat for the drying process in an oven section which can be fired with oil or solid fuel and which opens directly into one end of the drying section.
• the material is fed into the machine by the rotation of the drying section and is dried as it passes through this by the hot air from the oven and by the fact that a large part of the water in the corn near the oven will evaporate due to the heat radiating from this.
• the material is fed into the machine by means of the drying machine being slightly tilted in relation to the horizontal, and/or by means of angled paddles in the sides of the drying machine pushing the material forward or by changing the rotating speed of the drum. These methods can be detrimental to the flow of the material.
• the purpose of the present invention is, therefore, to make available a drying machine in which the speed at which the material is brought forward in the drying section can be regulated during operation without these disadvantages.
• a corn-drying machine in which the material is brought forward inside the drying section by guide blades which are or can be set at an angle relative to the drying section's longitudinal axis.
• the guide blades which are stationary and fixed relative to and inside the drying section, can have a fixed, angled position to bring the material forward at a constant speed, or they can be made so that it is possible to adjust them at different angles in order to alter the speed at which the material is brought forward.
• the individual guide blades can be set at different angles so that the material can pass through the drying section at different speeds.
• the placement of the guide blades in the drying section will cause greater turbulence in the drying air than with the known machines, and the corn will make contact with the heated surfaces of the blades, both of which conditions will increase the drying speed of the corn. It will also be possible to utilise this effect even when the guide blades are not adjustable or if they rotate with the drying section.
• the present invention makes it possible to control the position of the guide blades in a simple manner, for example to adjust the angle of the guide blades relative to the longtitudinal axis of the drying section in the vertical plane of the axis in such a way that the corn, when it falls on the blades as the section rotates, will be brought more or less forward.
• the steering rod ' s function can be to affect to affect the guide blades attached to the inside of the section or to the steering rod itself. In the latter case the steering rod could be comprised of two co-axial parts which, as when an umbrella is opened, are displaced axially in relation to each other and thereby affect the angle of the blades.
• the guide blades are comprised of a row of parallel and largely flat blades rigidly connected to and angled relative to the steering rod which can rotate in relation to the drying section and which can be locked so that it cannot rotate in relation to the base.
• the drying machine described in claim 4 is equipped with a riddling device with at least one riddle of largely cylindrical shape and attached co-axially to the drying section.
• Fig. 1 shows a drying machine pursuant to the present invention seen from the side
• Fig. 2 shows a vertical cross section of the machine's oven section
• Fig. 3 shows a vertical cross section of the machine's drying section.
• Fig. 4 shows another construction of the oven section seen in cross section from the side
• Fig. 5 shows a different way of feeding material into the machine pursuant to the present invention.
• the drying machine pursuant to the present invention is supported by a base 1, upon which the oven section 2 is fixed and the drying drum 4 is supported with rollers 6 at one end and with a principal bearing 8 at the other end.
• the oven section 2 has an oil burner 10 and a solid fuel grate 11 with a row of closely set parallel grate rods 12, the ends of which rest in the sides of the oven.
• the oven 2 is lined with fire brick 13 and can be fed with fuel from an opening 14 or at the back part 15 of the grate 11.
• the opening 14 ' also serves to provide primary air and, during standstill after firing with coal, for the extraction of hot gases with a stream of air in the opposite direction in order to avoid hot gas explosions.
• the fuel is fed into the oven with the aid of compressed air or steam which is supplied by the individual grate rods 12 or sections of the grate rods via pipe branches 16 and openings in the direction in which the fuel is fed.
• the back edges 19 of the grate rods 12 are serrated or corrugated in profile which makes it possible to feed primary air from the underside of the grate 11 when the grate rods 12 lie closely together, front edge to back edge.
• the primary air is supplied by a blower 21 on the underside of the oven and around the worm conveyor 22 placed in the bottom which carries the material from a hopper 23 to the drying drum 4.
• the drying drum 4 is divided into a drying section 30 and a riddling section 31, separated by a threshing rotor 32 with beaters 33.
• the inner sides of the drying section 30 are equipped with carriers 34 parallel to the longitudinal axis of the drum 4.
• the guide blades 40 which have a shape approximately equivalent to the inside diameter of the drying section 30, are rigidly mounted on a steering rod 41 which can be adjusted with a hand wheel 42, one end of which is in a seat 43 attached in the oven section 2, and the other end of which is supported by a seat in the hollow threshing axle 44.
• the threshing axle 44 can be operated via a sprocket wheel 45 and is again supported in the supporting axle 46 which, in the principal bearing 8, via radially extending rods 47, supports the drying drum 4.
• the supporting axle 46, and thereby the drum 4 can be made to rotate via a sprocket wheel 48.
• the co-axial riddles 48 and 49 which open into a take-up container 50, are attached to the rods 47.
• the worm conveyors 51, 52 and 53 can carry off the riddled material, for example, sand, grain and straw or stone.
• An air duct 54 for carrying off process air is connected at the top of the container 50.
• the stokehold 64 is shaped like a truncated cone, see Fig. 6, in order to supply more radiant heat to the inside of the drying drum 4.
• a conveyor 22 in the bottom of the oven 2 instead of feeding the material to be dried via a conveyor 22 in the bottom of the oven 2, one can, in order to avoid scorching or burning of the material due to heat from the oven, feed it through the side of the drum as shown in Fig. 7.
• a sloping plate 74 leads the material into the drying drum 4.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Drying Of Solid Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8149008

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Family Cites Families (1)

• 1987
  • 1987-12-21 DK DK671887A patent/DK671887A/da not_active Application Discontinuation
• 1988
  • 1988-12-21 WO PCT/DK1988/000214 patent/WO1989005950A1/en not_active Application Discontinuation
  • 1988-12-21 EP EP19890901105 patent/EP0390861A1/en not_active Withdrawn
  • 1988-12-21 AU AU29141/89A patent/AU2914189A/en not_active Abandoned

Non-Patent Citations (1)

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