RU2315252C2 - Method of drying long wood articles - Google Patents

Abstract

FIELD: wood working industry.

SUBSTANCE: method comprises setting articles vertically, affecting the articles by ultrasonic field along the fibers of the articles, and removing dump.

EFFECT: reduced power consumptions.

Description

The invention relates to the field of forestry and woodworking industry, and more specifically to a technology for drying long wood products.

A known method of drying lumber according to the patent of the Russian Federation No. 2134388, IPC F26B 3/347, 5/02. The method consists in heating the material during its movement in the microwave field and the subsequent removal of moisture from it. Moisture removal is carried out during the movement of the material by exposure to a transverse mechanical load with the simultaneous application of unidirectional ultrasonic vibrations to the load.

The disadvantages of the known method of drying lumber are:

- relatively low productivity of the process, since the speed of sound propagation in wood in the transverse direction is 1500 m / s (for comparison, the speed of sound propagation in the longitudinal direction is 5200 m / s);

- high energy costs associated with microwave heating of lumber;

- the complexity of the device for implementing the method.

The closest in the set of essential features to the claimed method, the analogue (prototype) is the known method of drying wood - application for invention of the Russian Federation No. 2002135812, IPC F26B 7/00, 5/02.

In the known method, the elongated wood products are dried using hot air, in which the products are maintained in an upright state and are separated from each other by dividing elements. The products are lowered with their ends to a depth of H in a container containing a water repellent, then they are exposed to the bottom of the container from the outside with a pulsed ultrasonic field with a frequency of filling the radio pulse (8-15 kHz), duration (10-20 ms), power (300-500 W), at the same time, due to the piezocallillar effect, the hydrophobizer is intensively promoted along the longitudinal fibers of the products, after which the products are mounted on the active surface of the electro-acoustic transducer and the hydrophobizer H column is moved along the axis of divium and simultaneous displacement of moisture.

The disadvantages of this method of drying are:

- high energy costs associated with both the need to move the product during the implementation of the method, and the need to ensure the movement of the water repellent from bottom to top along the longitudinal fibers of the product and displacement of moisture, overcoming the forces of gravity;

- the complexity of the method, which involves blowing the product with hot air (which is ineffective when drying, for example, logs and inevitably leads to deformation of the product due to various stresses), and repeated movement of the product during the drying process.

The technical result of the invention is to reduce energy consumption, simplifying the method.

The specified technical result is achieved by the fact that in the method of drying long wood products, including their installation in a vertical position, the action of an ultrasonic field along the fibers of the products and the removal of moisture, according to the invention, the action of the ultrasonic field is carried out in a continuous mode, and the moisture is removed by the action of the gravitational field of the earth .

The continuous regime of exposure to the ultrasonic field allows (gives time) the manifestation of gravitational forces, under the influence of which moisture naturally moves from top to bottom and is released from the lower end of the product. In addition, in the claimed method there is no need to move and reinstall the product, as well as perform other additional operations. All this allows you to reduce energy consumption and simplify the drying method.

The drying method is as follows.

A long wood product in a vertical position is mounted on a magnetostrictive transducer made in the form of a platform, and its position is fixed. Excite ultrasonic vibrations directed along the wood fibers. After stabilization of the operating mode, the moisture in the product is subjected to the combined effect of ultrasonic vibrations and gravitational forces, after which spontaneous liquid withdrawal begins with its release from the lower end to the platform surface. The drying process is controlled according to indications on the balance or using sensors associated with a moisture meter.

Currently, the applicant has made a prototype installation that implements the proposed method. Tests have shown its high efficiency and productivity.

Claims (1)

The method of drying long wood products, including their installation in a vertical position, exposure to an ultrasonic field along the fibers of the products and moisture removal, characterized in that the exposure to the ultrasonic field is carried out in a continuous mode, and the removal of moisture is carried out by the influence of the gravitational field of the earth.