RU2534263C1 - Method of orientation of wood particles and device for its implementation - Google Patents

Abstract

FIELD: woodworking industry.

SUBSTANCE: feeding of particles is carried to the guide elements, and reciprocating movement of the guide elements along and against the direction of orientation. The guide elements are moved in the direction of orientation at a rate of 3-10 times the speed of displacement against the direction of orientation. The device for orienting wood particles comprises guide elements, which are placed on the holders connected to the drives. The holders are made with the ability of reciprocating movement of adjacent guide elements in the forward and reverse directions. The drives are made in the form of electromagnets and springs with the ability of movement of the guide elements in the forward and reverse directions at different speeds.

EFFECT: improved quality of orientation of wood particles.

2 cl, 4 dwg

Description

The invention relates to the woodworking industry and can be used in the manufacture of particle boards from oriented chips.

A known method of orienting wood particles, including the supply of chips to the guiding elements and moving adjacent guiding elements in opposite directions along the orientation direction at the same speed [RU No. 2315689, IPC B27N 3/14, Method for orienting wood particles. - Publ. 01/27/2008. Bull. No. 3].

When implementing the known method, the angle of the particles in the chip carpet depends on their length, which in a single stream of particles can vary several times. This reduces the quality of orientation.

A known device and method for parallel laying of elongated lignocellulosic particles, comprising feeding particles to the guiding elements and moving at the same speed the adjacent guiding elements in opposite directions [US No. 4295557, IPC B65G 47/34. Apparatus and method for aligning elondated lingo-cellulosic strands into parallelism. - 11/15/1977].

When carrying out this method, particles that do not reach a turning angle sufficient for passing between the guide elements in one cycle of movement of the elements return to their original state, prevent the passage of newly supplied particles, which leads to a violation of the orientation process and reduces its quality.

A known method of orienting wood particles (strands), including feeding particles to the guiding elements and reciprocating movement at the same speed of adjacent guiding elements along and against the direction of orientation [US No. 3478861, IPC B27N 3/14. Orienting wood strands. - 11/18/1969].

The known method is effective only for short particles. If a long particle does not have time to turn around with the guide elements during their movement in one direction, then when the elements move in the opposite direction, the particle turns in the opposite direction, being in the initial position, the orienting device is clogged, which affects the quality of orientation.

A device for leveling particles is known [US No. 4506778, IPC B65G 47/24. Flake aligner including reciprocating baffles. - 03.26.1985], including guide elements placed on a frame connected to a drive (crank mechanism) made with the possibility of reciprocating movement of the frame.

A device for orienting wood particles is known [SU No. 1595642, IPC B27N 3/14. A device for orienting wood particles. - 1990, Bull. No. 36], including guide elements located on a frame made with the possibility of oscillatory motion in a vertical plane by means of a mechanical drive (crank mechanism).

Also known is a forming machine for carpet flooring of wood particles, containing an orienting device that includes guiding elements placed on a frame made with the possibility of reciprocating vibrations using a mechanical drive [A.S. USSR No. 574347, B29J 5/04. Particle forming machine for wood flooring. - 1977, Bull. No. 36].

In known devices, the orientation of the particles occurs due to a slight change in the angle of the particles during vibration of the guide elements, which is ineffective, therefore, these devices provide low quality orientation and have low productivity.

A device is known that implements a method for orienting wood particles [US No. 3478861, B27N 3/14. Orienting wood strands. - 18.11.1969], including guide elements that are placed on holders connected to the drives, arranged for reciprocating movement of adjacent guide elements with the same speeds in the forward and reverse directions, while the actuators are made in the form of electromagnets and springs with the possibility of moving the guides elements in the forward and reverse directions with different speeds.

In the known device, not particles that have not developed between the guide elements in one cycle of their movement, return to their original state and impede the passage of newly supplied particles, which leads to disruption of the orientation process and reduces its quality.

The invention solves the problem of improving the orientation quality of wood particles.

The technical result from the use of the invention is to improve the quality of orientation due to the possibility of simultaneously orienting wood particles of different lengths and eliminating clogging of the guide elements.

This is achieved by the fact that in the method of orienting wood particles, comprising feeding particles to the guiding elements and reciprocating movement of adjacent guiding elements along and against the orientation direction, according to the invention, the movement of the guiding elements in the orientation direction is carried out at a speed of 3-10 times speed of movement against the direction of orientation.

The technical result is also achieved by the fact that in the device for orienting wood particles, including guide elements that are placed on holders connected to the drives, made with the possibility of reciprocating movement of adjacent guide elements in the forward and reverse directions, according to the invention, the drives are made in the form of electromagnets and springs with the ability to move the guide elements in the forward and reverse directions at different speeds.

The inventive method of orienting wood particles is characterized by moving the guide elements in the orientation direction at a speed of 3-10 times the speed of movement against the direction of orientation. The inventive device for orienting wood particles is characterized by the execution of drives in the form of electromagnets and springs with the ability to move the guide elements in the forward and reverse directions at different speeds. Due to this, simultaneous orientation of wood particles of different lengths is possible and clogging of the orienting device is eliminated.

Figure 1 presents a diagram of an orienting device with compressed springs, figure 2 is a diagram of an orienting device with open springs, figure 3 is a fragment of the holder with guide elements, figure 4 is a form of voltage supplied to the electromagnets.

The device for orienting wood particles includes guiding elements 1 made in the form of plates, rods or strings and placed parallel to each other in the orientation direction on the holders 2-5, made with the possibility of reciprocating movement in a horizontal plane. The holders 2 and 3 are made with the possibility of reciprocating movement towards the holders 4 and 5, therefore, when operating, adjacent guide elements 1 move in opposite directions. The electromagnets 6 serve to move the holders 2-5 in one direction, and the springs 7 to move the holders 2-5 in the opposite direction. The device also contains transverse restriction plates 8 and longitudinal restrictive plates (not shown in FIG.).

The method of orienting wood particles is as follows.

, то соотношение скоростей в данных направлениях имеет видThe pause period t ₂ between the sawtooth pulses is set equal to the opening time of the spring 7 (for example, t ₂ = 0.2 s), and the feed period of the sawtooth voltage t _{1 is} set according to the expression t ₁ = (3 ... 10) t ₂ , (for example, t ₁ = 1.5 s). As the voltage supplied to the inputs a and b increases during the period t ₁ , the rods of the electromagnets 6 are retracted, the springs 7 are compressed, while the holders 2 and 3 move in one direction, and the holders 4 and 5 in the opposite direction, adjacent guide elements 1 move in opposite directions with uniform speed V ₁ . During the pause period t _{2, the} springs 7 open, moving the holders 2-5 in the opposite directions with a speed of V ₂ . Because distance traveled by holders 2-5 in both directions equally

, then the ratio of speeds in these directions has the form

that is, the movement of the guide elements 1 in the orientation direction is carried out at a speed of 3-10 times higher than the speed of movement against the direction of orientation.

Wood particles are fed between the transverse restriction plates 8 and the longitudinal restrictive plates (not shown in FIG.) To the guiding elements 1. Part of the particles falling mainly along the orientation direction fall between the elements 1. The remaining particles falling across or diagonally to the elements 1, in the period t _{1 are} deployed by adjacent guide elements 1 moving at a low speed V ₁ in the orientation direction. In this case, the short particles fall through and fit into the chip carpet (not shown in FIG.), And the long particles remain “half-expanded” on the guide elements 1. During the pause period t _{2, the} guide elements move in the opposite direction with a high speed V ₂ located on them particles slip, mainly maintaining their position. In the following periods t _1, underdeveloped particles are given one or more additional turns until they completely pass between the guide elements 1 and lay in a chip carpet. This prevents clogging of the device with newly supplied particles, i.e. violation of the particle orientation process is eliminated and its quality is improved.

The invention improves the quality of orientation of wood particles and, therefore, increase the strength of particle boards from oriented chips, as well as reduce the transverse dimensions of the device.

Claims (2)

1. The method of orienting wood particles, including the supply of particles to the guiding elements and the reciprocating movement of adjacent guiding elements along and against the direction of orientation, characterized in that the movement of the guiding elements in the orientation direction is carried out at a speed 3-10 times higher than the speed of movement against orienteering directions. 2. A device for orienting wood particles, including guide elements that are placed on holders connected to the drives, made with the possibility of reciprocating movement of adjacent guide elements in the forward and reverse directions, characterized in that the drives are made in the form of electromagnets and springs with the possibility of movement guiding elements in the forward and reverse directions with different speeds.

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