RU2331828C2 - Tunnel multizone dryer for friable and poor-friable materials drying - Google Patents

Abstract

FIELD: heating; transportation.

SUBSTANCE: dryer contents conveyor and drying chamber where above the working surface of conveyor and perforated carrying partition are mounted forcing and absorbing chests, lower bases of which are outfitted by sloping plates. Slopping plates support periodic reversible motion of drying agent through the drying chamber. Under working branch of conveyor alternately mounted absorbing and forcing chests, outfitted by perforated carrying partition, which implement drying agent vertical movement, at that conveyor is comprised as swivel-hanged frame outfitted by swivel-fixed racks which support periodical back-and-forth motion of drying material through drying chamber. Frame is kinematically connected to crank mechanism which is allowed to change racks entry angle to the layer of drying material at that racks rolling bearing are mounted with vertical and horizontal plane translatable of drying material.

EFFECT: increasing of measured capture processes; loosening and transportation along drying chamber.

2 cl, 3 dwg

Description

The invention relates to agricultural machinery, specifically to machines for drying bulk granular materials, in particular grains of cereal crops and poorly bulk materials, such as flaxseed.

Known multi-zone dryer for drying fibrous materials, containing a drying chamber with a conveyor, loading and unloading devices, pressure boxes with movable air guide screens. A casing is installed above the working branch of the conveyor, the ceiling part of which is made in the form of a profiled lattice [1]. The multi-zone dryer is characterized in that it ensures uniform drying of flax seeds across the width of the conveyor. However, the moisture content of the dried material, the difference between the lower and upper layers can reach from 3 to 29% with an initial moisture content of flax seeds 28 ... 30%.

A known installation for drying fibrous materials, comprising a drying chamber with loading and unloading conveyors, a piping system for circulating a drying agent, oscillating collectors located along the direction of movement of the material. Fluctuations in the collectors increase the heat transfer coefficients, prevent braking of the layer and additionally loosen the layer [2].

Closest to the claimed technical essence is a multi-zone conveyor dryer for drying bulk and low-flowing materials, containing a drying chamber in which discharge and suction boxes are alternately installed above the working branch of the conveyor. Due to the design features of a multi-zone conveyor dryer, discharge and suction boxes are installed alternately above the working branch of the conveyor, the lower bases of which are equipped with inclined plates providing periodic reverse movement of the drying agent through the drying chamber, and suction and discharge boxes equipped with perforated days are alternately installed under the conveyor working branch. which carry out the movement of the drying agent in the vertical direction. This achieves the creation of periodically working zones of heating, "curing" and cooling in areas of the transversely directed drying agent to the periodically moved material in the direction of transportation, significantly reduces the heat consumption for drying the material [3].

A disadvantage of the known multi-zone conveyor dryer is the complexity of the conveyor design and the overlapping of the perforation conveyor straps, which reduces the live ratio of the gas distribution system.

The present invention is aimed at improving the reliability and intensification of drying processes: dosed capture of the dried mass, its loosening and transportation along the drying chamber.

The problem is solved in that according to the invention, a tunnel multi-zone dryer for drying bulk and low-flowing materials, comprising a conveyor and a drying chamber, in which there are discharge and suction ducts above the conveyor’s working surface and perforated load-bearing partition, the lower bases of which are provided with inclined plates providing periodic the reverse movement of the drying agent through the drying chamber, and under the working branch of the conveyor are alternately installed in asyvayuschy and discharge duct, provided with a perforated load bearing wall, which carry the movement of the drying agent in the vertical direction, according to the invention, the conveyor is designed as a pivotally suspended frame provided with hinged tines providing periodic reciprocation material to be dried through the drying chamber. The frame is kinematically connected with a crank mechanism having the ability to change the angle of entry of the rake into the layer of the material to be dried, while the rolling bearings of the rake are mounted to move the material to be dried in the vertical and horizontal planes.

Articulated rakes are equipped with a swinging rod, which limits the movement of the material up.

The proposed design of a multi-zone tunnel dryer for drying bulk and low-flowing materials due to distinctive features (a conveyor consisting of a pivotally swinging frame with tines attached to it) provides a solution to the problem - increasing the reliability and intensification of the processes of metered capture of the dried mass, loosening and transportation along the drying chamber .

Figure 1 schematically shows a tunnel multi-zone dryer, a longitudinal section; figure 2 is the same, plan view; figure 3 - conveyor for metered capture, tedding and transportation of the dried material along the drying chamber in figure 1.

A multi-zone tunnel dryer for drying bulk and low-flowing materials (Fig. 1), comprising a conveyor and a drying chamber 10, in which there are discharge and suction ducts 4, 5 above the conveyor working surface and a perforated load-carrying partition, the lower bases of which are provided with inclined plates, providing periodic reverse movement of the drying agent through the drying chamber, and under the working branch of the conveyor, suction and discharge ducts 1, 2 and 3 are alternately equipped with perforators according to the invention, the conveyor is made in the form of a pivotally suspended frame 11 provided with pivotally mounted rake 13, the upper shoulders of which are made in the form of spherical heads 14 connected to the tubular element 15. Pivotally mounted rake equipped with a swinging rod 16, including a screw mechanism 21, which restricts the movement of material up. The crankshaft 12 is driven by an electric drive 20. The heat generator 17 is connected to the discharge ducts 1 and 3 by means of a dividing pipe 18.

A multi-zone tunnel dryer works as follows: a material, for example flaxseed or grain, is laid in layers on a perforated load-bearing partition 9 by a conveyor consisting of tines 13 and a swinging frame 11, moves along a drying chamber 10 with a given speed and, after turning on the drying chamber, the heat generator 17 is turned on and fans 7 and 19. The drying agent through the discharge channel 18 and duct 1 and 3 enters the layers of material, penetrating it from the bottom up. The spent drying agent by the recirculation loop, pipe 6 and fan 7 is fed into the layers of material from top to bottom, and then box 2 is discharged into the cyclone. This creates the conditions for uniform heating of the upper and lower layers of the material, and the partial use of the spent drying agent allows to reduce energy consumption.

The tines of the conveyor 13 comb the feed mass and direct them into the gap between the tines and the perforated load-bearing partition 9 of the drying chamber 10, while performing a complex elliptical reciprocating motion using crankshafts 12 and an electric drive 20.

Depending on the fractional composition and moisture, the mass of the material of the rake can occupy different positions by changing the length of the lever 16 with the screw mechanism 21, this ensures the necessary speed of movement of the dried mass, its loosening and a predetermined displacement of the mass up along the rake working plane.

This design of the mechanism of movement of the dried mass provides increased reliability and intensification of the drying processes, metered capture of the mass, its loosening and transportation along the drying chamber.

Information sources

1. USSR copyright certificate 553421, cl. F26B 17/01. Multi-zone dryer for fibrous materials. Author A.I. Muraviev.

2. Copyright certificate of the USSR 523259, cl. F26B 17/04. Installation for drying fibrous materials. Authors O.A. Kremnev, V.R. Borovsky, R.E. Sitnyakovsky and L.M. - G. Mishnaevsky.

3. Copyright certificate for the patent of the Russian Federation RU (II) 2176059 (B) C2, cl. F26B 17/04. Conveyor multi-zone dryer for bulk and poor-flowing materials. Authors E.M. Zimin, A.V. Orekhov, M.S. Volkhonov, B.C. Krutov, S.A. Polozov.

Claims (2)

1. Tunnel multi-zone dryer for drying bulk and low-flowing materials, containing a conveyor and a drying chamber, in which a discharge and suction ducts are installed above the conveyor surface and a perforated load-bearing partition, the lower bases of which are provided with inclined plates providing periodic reverse movement of the drying agent through the drying chamber and under the working branch of the conveyor, suction and discharge ducts equipped with perforated cargo are alternately installed carrying partition, which carry out the movement of the drying agent in the vertical direction, characterized in that the conveyor is made in the form of a pivotally suspended frame equipped with pivotally mounted rakes, providing periodic reciprocating movement of the dried material through the drying chamber, the frame is kinematically connected with a crank mechanism, with the ability to change the angle of entry of the rake into the layer of the dried material, while the rolling bearings of the rake are installed with the possibility eremescheniya material to be dried in the vertical and horizontal planes. 2. The tunnel multi-zone dryer according to claim 1, characterized in that the articulated rake is equipped with a swinging rod, which restricts the movement of the material up.

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