SU1604616A1 - Line for production of wood-particle boards - Google Patents

Abstract

The invention relates to the woodworking industry and can be used for the manufacture of chipboard. The purpose of the invention is to improve the quality of particle boards by gradually controlling and controlling the moisture of the chips. The chips coming from the chip machine 1 to the dryer 2 are controlled by the device 11 for determining the humidity of raw chips, and when leaving it by the device 12 for determining the humidity of dry chips, then the chips pass through the mixer 5, into which the binder, is mixed and fed into a forming machine 8, at the entrance into which the chips are controlled by a device 13 for determining the humidity of the tarred chips, which forms the carpet and, via the main conveyor, is sent to a hot press 10 for thermal processing. The attachments 11, 12, and 13, each of which is made up of an optical radiation source 14, an optical assembly 15, photodetectors 16 with amplifiers 17, and a block 18, are an assembly for estimating the fluid humidity of the chip. The luminous flux from source 14 is reflected from the material under study 21 and is focused by the optical system 19 into a narrow beam, which is decomposed by the optical prism 20 into reference and measuring rays incident on the corresponding photodetectors. In block 18, the ratio of the wavelengths of the reference and measurement beams is measured, since the ratio of the signals of the measurement and reference channels depends only on the humidity. 2 Il.

Description

The invention relates to the woodworking industry and can be used to make wood ecHocTpysve4Hbix boards.

The purpose of the invention is to improve the quality of particle boards by gradually controlling and controlling the moisture of the chips.

FIG. 1 is a schematic of the line in FIG. 2 is an optical line diagram.

The lines for the manufacture of chipboard includes successively installed and kinematically connected machine chip 1, a dryer 2 with a fuel agent supply controller 3 and an automatic control device 4, a mixer 5 with a binder supply controller 6 and a control unit 7 forming Maschina 8, the main conveyor 9 and the hot press 10, Lini is also equipped with a unit for estimating the current moisture of the chips in the form of moisture measuring devices installed in front of the dryer 2j and the forming machine 8 naturally raw 11, dry 12 and tar 13 chips, each of which is made as an optical radiation source 14, an optical node 15 and photo detectors 16 with amplifiers 17 and a measuring unit 18, and the output of the device 11 for gradually determining the humidity of raw chips is electrically connected the automatic control device 4, the outputs of the dry chip moisture detection device 12 are electrically connected to the control unit 7 and the automatic control device 4 7, and the output of the humidity detection device 13 is and the tar resin is electrically connected to the control unit 7, the output of the automatic control device 4 is connected to the drying unit 2 via the fuel agent supply controller 3, and the output of the control unit 7 is electrically connected to the mixer 5 through controller 6 -, binder, optical node 15 is implemented as a focusing 19 and decomposing 20 elements, the latter being in the form of an optical prism. The test material 21 is placed in front of the focusing element.

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The line operates as follows. Chip from the chip machine 1 is sent to the dryer 2, while its humidity is controlled by means of an adaptation. By determining the humidity 11, and by leaving the dryer by means of the device 12, the luminous flux from the radiation source 14 is reflected from the material under study 21 or passes through it (depending on its location with respect to the material under study) and is focused by the optical system into a narrow beam, which is decomposed by an optical prism 20 into reference and measuring, perceived by each photoreceiver 1 6,

The measuring beam has a length. waves corresponding to the maximum absorption of water (e.g., 0.76; 0.98; 1.45; 1, 93 microns, etc.); and the reference beam has a wavelength at which absorption is minimal (for example, 0.6; 0.88; 1.2; 1.8 μm, etc. (up to). The measuring and reference beams, together with their photodetectors and amplifiers, form measuring and reference channels, the signals from which are sent to measuring unit 18, where their ratio is measured. In the presence of moisture in the material under study, the signal of the measuring channel is proportional to humidity due to the fact that the radiation intensity with a given wavelength depends on the moisture content, and the signal of the reference channel remains the same, i.e., the ratio of the signals of the measuring and reference channels depends only on humidity. To improve the accuracy of measurements in this device several measuring and reference channels can be used.

The proposed automatic control device controls the supply of the fuel agent through a dual-control system. The first control loop generates a signal to the fuel agent supply controller 3 according to the proportional law (P-law) of regulation depending on the humidity of the raw chips. The second control loop generates a control action on the valve according to the proportional-integral law (PI law) of control taking into account the time 516046

characteristics of the dryer and the moisture content of dry chips.

The control unit of the binder supply controller provides a control to the binder supply controller 6 depending on the difference between the moisture of the tar and dry chips. A stable moisture gumbo strand is formed into a carpet by a shaping machine 8 and sent along a main conveyor 9 to a hot press 10 for heat treatment.

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Claims (2)

1. A line for the manufacture of chipboard, consisting of sequentially installed and kinematically interconnected straddle legs with a machine, with a earhook and with a fuel agent regulator and an automatic control device, a mixer with a regulator a control unit, a forming machine, a main conveyor and a hot press, characterized in that, in order to improve the quality of chipboard, the line is equipped with a mixer installed before the mixer and a forming mask, 0 five 0 5 o 66 instruments for determining the moisture content respectively of wet, dry and resinous chips, each of which is made in the form of an optically coupled source of optical radiation, an optical assembly and photodetectors with corresponding amplifiers, the outputs of which are connected to the inputs of the measuring unit associated with the first input of the automatic regulation device, dry chips - with the second input of the automatic regulation device and the first input of the control unit and, the second input of which is connected to the output of the device for the stepwise determination of the humidity of the tar resin, and the output of the control unit is connected to the mixer via the binder supply controller, the output of the automatic control device is connected to the dryer via the fuel agent supply controller. I 2. The line pop. 1, which differs from the fact that the optical assembly is made in the form of a focusing element and an optical prism connected with it. 1and LI 2f. IS (Rig2