RU2520271C2 - Centrifugal sawn timber drying method - Google Patents

Abstract

FIELD: heating, drying.

SUBSTANCE: invention relates to artificial dehydration of timber and can be used at timber processing works. A method involving laying of sawn timber onto a flexible belt, formation of a pack of sawn timber on the outer surface of the pulley housing by winding the flexible belt with sawn timber laid onto it on the pulley housing on the outer side, balancing of the pulley with the pack of sawn timber and its rotation.

EFFECT: invention reduces time costs for formation of a pack of sawn timber on the drum outer side; besides, there is a possibility of applying this method in automatic sawn timber drying lines.

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Description

The invention relates to artificial dehydration of wood and can be used in technological lines for the production of lumber on an industrial scale at timber processing enterprises.

A known method of centrifugal drying of lumber, including the formation of a package on the outer surface of the drum body and its rotation at a speed that provides centrifugal dewatering of lumber [1].

The disadvantage of this method is that the formation of a package of lumber on the surface of the drum body is done manually by stacking individual lumber in special grooves, which leads to a significant investment of time for this operation, and the operation of unloading lumber after drying. In addition, due to the need for manual laying of a package of lumber on the surface of the drum body, this method cannot be applied to automatic lines for drying lumber.

A known method for rotary drying of wood, including the formation of a package of processed wood products, feeding the package and its strengthening in the cavity of the drum, balancing the drum with reinforced packages of processed wood products and rotating it at a speed that provides centrifugal dehydration of lumber [2].

The disadvantage of this method is that moisture under the influence of centrifugal force passes through the entire package (from the base of the package to the inner wall of the drum). This leads to a significant increase in the time of rotary drying, and consequently, to an increase in energy consumption.

The technical result, the achievement of which the claimed method is aimed, is to reduce the time spent on the formation of a package of lumber on the outside of the drum. In addition, it becomes possible to use this method in automatic lines for drying lumber.

A technical result is achieved due to the fact that the lumber is laid on a flexible tape, and the formation of a package of lumber on the outer surface of the drum body is carried out by winding a flexible tape with lumber laid on it on the drum body from the outside.

An example implementation of the method is shown in figure 1 - installation diagram for centrifugal drying of lumber.

The installation consists of a drum 1, a flexible tape 2, a drying chamber 3, a feeding mechanism 4, a receiving table 5.

The drum 1 includes a drum housing 6 mounted on a shaft 7, bearings 8, a drive 9, a gearbox 10, a belt 11, pulleys 12 and 13, a balancing mechanism 14, a gripping and tensioning mechanism 15, a locking device 16 and a brake system located on shaft 7 (not shown).

The drying chamber 3 consists of walls 17, a protective cover 18, a bath 19 and a drain pipe 20.

The feed mechanism 4 includes a conveyor 21 and a locking mechanism 22.

The receiving table 5 has holes for water drainage (not shown).

Drying of lumber is as follows. The end of the flexible tape 23 using the fixing mechanism 22 is fixed on the feed mechanism 4. Then, the lumber 24 by the conveyor 21 are stacked on the flexible tape 2.

After filling the flexible tape 2 with lumber 25, a packet of lumber is formed on the surface of the drum body 6. For this, the gearbox 10 is lowered and, using the drive 9, pulleys 12 and 13, belt 11, the flexible tape 2 with the lumber 25 laid on it is wound on drum casing surface 6.

The laying of lumber 24 by the conveyor 20 can be carried out simultaneously with the formation of a package of lumber on the surface of the drum body 6. For this, the lumber 23 using the conveyor 20 are laid on a flexible tape 2. At the same time, the drum casing 6 is rotated and unwound by a gripping and tensioning mechanism 15 flexible tape 2, so that the flexible tape 2 does not sag under the weight of the lumber 25 laid on it and holds them on the surface of the drum body 6. In the process of performing simultaneous laying material 24 on the flexible tape 2 and the formation of a package of lumber on the outer surface of the drum housing 6 on the gearbox 10 is included a lower gear.

After one revolution of the drum casing 6 around the shaft 7, the end of the flexible tape 23 is attached to the fixing device 16.

Next, with the help of the gripping and tensioning mechanism 15, the final fixing of the lumber 25 to the drum body 6 is carried out.

Then, the protective cover 18 is closed and the second gear on the gearbox 10 is engaged. Using the drive 9, pulleys 12 and 13, the belt 11, the drum body 6 with lumber 25 fixed thereon is rotationally driven. In the process of rotation of the housing of the drum 6 using the balancing mechanism 14 is its balancing.

When rotating under the influence of centrifugal forces, water is removed from the lumber. Water, falling on the inner surface of the walls 17, the protective cover 18 and on the receiving table 5, flows into the bath 19 and is removed through the drain pipe 20 from the drying chamber 3.

After centrifugal drying, the drum casing 3 using the brake system is stopped and the fixation device 16 releases the end of the flexible tape 23, while the lumber is unloaded onto the receiving table 5 and then removed from the drying chamber 3.

Next, the protective cover 18 rises and the operations are repeated.

The inventive method reduces the time spent on the formation of a package of lumber, as it eliminates the manual laying of individual lumber on the surface of the drum. In addition, it becomes possible to simultaneously stack lumber on a flexible tape and form a package of lumber on the drum body, which also reduces the time required to form a package. Due to the exclusion of the manual formation of a package of lumber on the outer surface of the drum, the proposed method can be applied in automatic lines for drying lumber.

BIBLIOGRAPHY

1. Patent RU 114360 "Device for dehydration of lumber", priority from 03.20.2012.

2. Patent RU 2279613 "Installation for rotational drying of wood", priority from 04/27/2006.

Claims (1)

The method of centrifugal drying of lumber, including forming a package on the outer surface of the drum casing, balancing the drum with a package of lumber and rotating it at a speed that ensures centrifugal dewatering of the lumber, characterized in that the lumber is laid on a flexible tape, and the formation of a package of lumber on the outer surface of the casing the drum is carried out by winding a flexible tape with lumber laid on it on the drum body from the outside.