SU1595642A1 - Apparatus for orienting wood particles - Google Patents

Abstract

The invention relates to the woodworking industry, in particular to the production of chipboard. The purpose of the invention is to improve the quality of orientation of wood particles. The device comprises an orienting grid 1 mounted on springs 2 with the possibility of oscillating motion in a vertical plane by means of a drive with a crank-connecting rod mechanism. New is the arrangement between the crank mechanism and the orienting grid 1 of the lever 3 with a variable ratio of arms mounted on the movable support 8, which is adapted to move with the help of an electromagnet 11, the introduction of a sensitive element 12 installed in a stream of wood particles, an amplitude detector 13 , a smoothing filter 14 and a power amplifier 15, and the output of the sensitive element 12 is connected via an amplitude detector 13, a smoothing filter 14 and a power amplifier 15 to the electric winding gnita 11. The essence of the invention consists in expanding the range of sizes of orientable particles by creating high-frequency and low-frequency vibrations of the orienting grid 1. 2 Il.

Description

1

The invention relates to the woodworking industry, in particular to the production of chipboard. The purpose of the invention is to improve the quality of orientation of wood particles.

Fig. 1 is a schematic of the device for the orientation of wood particles; Fig. 2 shows the characteristic of the mechanical oscillations created by the proposed device (fe is the high-frequency component of the oscillations; n is the low-frequency component of the oscillations).

The device for orientation of wood particles contains an orienting grid 1 mounted on springs 2 and connected to the lever arm 3, to the other arm of which a connecting rod 4 connected to crank 5, which is mounted on an asynchronous electric motor, is connected. The lever 3 is made with a variable ratio of shoulders and contains a groove 7, in which the shoulder of the movable support 8 is mounted for movement along the lever 3, the other shoulder of the mobile support .8 is connected to the return spring 9 and the rod 10 of the electromagnet 11, the device also contains mounted in the flow of wood particles above the orienting grid the sensitive element 12, made, for example, in a thin plate, on the bottom surface of which an electro-acoustic transducer is fixed, for example, from barium titanate, amplitude detector 13, the smoothing filter 14 and power amplifier 15, whose output is connected to the coil of the electromagnet 11.

The device works as follows.

Include engine 6, crank 5

the rod 4 sets in oscillatory movements the lever arm 3, the other arm of which leads in an oscillatory movement in the vertical plane to the orienting lattice with the frequency fa. equal to, for example, 25-50 Hz and determined from the expression

f. -

in gQ.

where n is the speed of rotation of the engine 6, rpm,

The flow of wood particles is fed through the orienting grid 1 to the forming conveyor (not shown). Particles that feed parallel to the orienting cells of the lattice 1. pass through the lattice, while those falling diagonally or perpendicularly to the cells are tossed up with a lattice until they are turned parallel to the cells. Under the influence of the incident: particles in the plate of the sensing element 12, elastic oscillations are excited with an amplitude proportional to the mass, t, e, the particle size, and with a frequency proportional to the number of particles. These oscillations are converted by the sensing element 12 into electrical signals and are fed to the input of the amplitude detector 13, where they are converted to unipolar. Further, these signals pass a smoothing filter 14, the output of which will be unipolar with a voltage particles incident on the orienting grid 1, the voltage is amplified by the power amplifier 15 and is fed to the winding of the ferromagnetic 11, the rod 10 of which is drawn in by an amount proportional to this voltage rotates to the starting position for return spring 9, and the rod is drawn in the stronger, the larger the size of the large particles in the flow. The shoulder of the movable support 8 reciprocates in the slot 7 of the lever 3. The ratio of the arms of this lever changes and the orienting grid 1, besides high-frequency vibrations with frequency fs due to the connecting rod 4, also receives a low-frequency component of oscillations due to a change in the ratio of arms of lever 3 with a frequency fn equal, for example, 2-10 Hz and proportional to the number of large wood particles per unit area of flow, and with an amplitude proportional to the size of large particles. In this case, high-frequency oscillations (vibrations) of the orienting lattice 1 throw up small wood particles, and low-frequency oscillations are large particles, there is a complete orientation of all wood flow particles, and large particles do not prevent further flow of particles through the orienting grid 1,

Claims (1)

An apparatus for orienting tree particles, comprising an orienting grid mounted on springs with the possibility of oscillating motion in a vertical plane by means of a drive with a crank mechanism, characterized in that, in order to improve the quality of orientation of tree particles, it is equipped with a sensitive element, an amplitude detector a smoothing filter, a power amplifier and an electromagnet, with a lever located between the crank mechanism and the orienting grid. g with a variable ratio of shoulders mounted on a support movable and kinematically zan- hydrochloric communication with electromagnet ,, wherein the sensor is mounted above it is associated with a series-connected amplitude detector, a smoothing filter, and a power amplifier, the output of which is connected to the electrical winding o. the orientation lattice, and the output of the last- 5 romagnet. h