Line to manufacture particle boards

FIELD: wood working industry.

SUBSTANCE: invention relates to wood working industry and may be used in production of multilayer particle boards. A line to manufacture particle boards comprises a belt conveyor, a machine to generate a chip carpet, a press and a spraying plant installed upstream the press with a valve to supply water. At the same time the line is equipped with an additional spraying plant with a valve installed upstream a shaping machine and a unit to measure warpage of boards installed downstream the press. Outlets of the unit to measure warpage are connected to control inlets of spraying plant valves. Due to development of moisture asymmetry of surfaces in the initial chip carpet, as a result of which mechanical stress occurs in a formed board during pressing that compensate for its warpage, which starts immediately after unloading of a board from the press, warpage in finished boards is eliminated.

EFFECT: invention may be used in production of multilayer wooden boards.

2 dwg

 

The invention relates to woodworking industry and can be used in the production of laminated wood boards.

The known method and device for the manufacture of plate materials [German patent DE 10315922 A1, MKI B27N 3/18 Verfahren und Anlage zur Herstellung von Plattenwerkstoffen]. The device comprises a conveyor belt forming machine, placed between forming machines sprinkler installation and press.

In the known device the water or water vapor serves sprinkler installation in the Central part of the bonded carpet to create steam blow during pressing. Thus pokeronline finished plates persists.

Known farmhouse-extrusion line for the production of chipboards [Handbook for the production of chipboard. / Youthlaw and others - 2nd ed. Rev. and supplementary): genre differences. prom the terrain, 1990, page 236], which includes a belt conveyor, machine for forming bonded carpet, press and installed before the pressure of a sprinkler with a valve to supply water.

In the famous line sprinkler is used to create steam blow during pressing, designed to reduce the time of pressing. However, in the process of production of chips from the upper layers of the carpet is screened at the bottom as a result of vibration, the upper surface of the bonded Cove is and dries or it may be waterlogged because of the inaccuracy of working sprinklers, and when there is a pressing asymmetry of the temperatures of the upper and lower pressing plates to 5-8°C [Galimov V.G. Equipment for pressing wood-fiber. - M.: Genre Differences. prom the terrain, 1983. - 56 S.] These and other causes humidity, structural and thermal asymmetry of the mode of production of chipboard, which causes them to warp.

The invention solves the problem of eliminating warp manufactured chipboard.

The technical result from the use of the invention is the reduction or complete elimination of warp manufactured boards by creating asymmetry humidity of the upper and lower surfaces of the compression bonded carpet, resulting in the slab arise mechanical stress, which compensate for pokeronline caused any technological errors.

This technical result is achieved by the fact that in line for the manufacture of chipboard, including belt conveyor, machine for forming bonded carpet, press and installed before the pressure sprinkler with valve for water supply, according to the invention the line is supplied with additional sprinkler installation with valve placed before forming machine, and the unit of measurement warp plates, placed after the pre is sa, moreover, the outputs of the measuring unit of warp is connected with the control inputs of gates sprinkler.

Declare line for the manufacture of chipboard is placing before forming machine additional sprinklers from the valve, the introduction of the measurement unit warp plates, placed after the press, and the connection of the outputs of the measuring unit of warp with the control inputs of gates sprinkler.

Eliminating warp ready plates is achieved by creating a humid asymmetry surfaces of the original strand Mat, which when pressed into the formed slab arise mechanical stress, compensating its warping, which begins immediately after unloading plates from the press.

Figure 1 shows the structural diagram of the line, figure 2 - schematic diagram of the measuring unit of warp.

Line for the production of chipboards and includes a belt conveyor 1, machine 2 for the formation of a bonded carpet (one or more depending on the number of layers of manufactured boards), press 3, made for example in the form of a continuous press action water sprinkler 4 located in front of the press 3, and a sprinkler 5 posted before forming machine 2. Poda is and water sprinklers 4 and 5 is carried out respectively by the valves 6 and 7, performed, for example, in the form of electromagnetic. The line also contains the block 8 measuring the warp of finished plates placed after the press, and the first and the second output unit 8 measurement warp connected to control inputs, respectively, of the valves 6 and 7. Unit 8 measurement warp contains is included in a bridge circuit the potentiometer 9, the engines are connected with the rollers 10 on the surface of the plate, and amplifiers 11-15.

The hotline is as follows.

Drive the conveyor belt 1 on which the forming machine 2 takes the chips, forming a bonded carpet. In the absence of steam blow when pressed sets the voltage at the control input unit 8 measurement warp is not available, Uass=0. If necessary, create a steam blow on the control input unit 8 serves specifies the voltage Uass. When the valves 6 and 7 are opened by the same amount, sprinklers 4 and 5 scatter on the conveyor belt 1 and the upper surface of the bonded carpet the same amount of water. In the absence of steam blow Uass=0 and the water through the valves 6 and 7 are supplied. Produce pressing in the press 3, after which the plate begins to warp. The magnitude and direction of the warp of the obtained plates are measured bloxom dimension warp, selected after you press 3.

In the absence of ready plates warp voltages at the outputs 1 and 2 of block 8 is equal to setpoint voltage Uassthrough valves 6 and 7 in sprinklers 4 and 5 is the same amount of water or water is not served at all. In the case of bending the middle of the plate (e.g., in the longitudinal direction) down the voltage at the output 2 of block 8 is only asking Uassand the voltage at the output of 1 is equal to the sum of the sets Uassand voltage of the amplifier 14, is proportional to the magnitude of the warp pointing down. Through the valve 6 serves more water than through the valve 7, the upper surface of the bonded carpet is moist stronger than the bottom, so after exiting the press 3 mid-ready plates warped up [see carpenters S.M. Study of warp chipboard with an asymmetric structure. / Izv. higher education institutions. Forest log. - 1989 - No. 1, p.53], compensating available pokeronline. In the case of bending the middle of the plate up output voltage 1 unit 8 is only asking Uassand the voltage at the output 2 is the sum of the sets Uassand voltage amplifier 15, is proportional to the magnitude of the warp upward. Through the valve 6 is served less water than through the valve 7, the lower surface of drugacnega carpet is moist stronger than the top, so after exiting the press 3 mid-ready plates warped down.

Line for the production of chipboards, including belt conveyor, machine for forming bonded carpet, press and installed before the pressure of a sprinkler with a valve to supply water, characterized in that the line is supplied with additional sprinkler installation with valve placed before forming machine, and the unit of measurement warp plates, placed after the press, and the outputs of the measuring unit of warp is connected with the control inputs of gates sprinkler.



 

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