Device for orientation of wood particles

FIELD: construction.

SUBSTANCE: device for orientation of wood particles comprises detector of chip mattress thickness, detector of wood particles weight, detector, three blocks of setting, distraction block, rooting block, two division blocks, non-linearity block, multiplication block, switch and amplifier, at that blocks are interrelated with each other. Displacement of flexible component happens with such speed, at which maximum orientation of wood particles takes place, independently on length of particles and thickness of formed chip mattress. At this speed of flexible component displacement, angle of orientation of wood particles in chip mattress is minimum, and strength of manufactured wood-particle boards is maximum.

EFFECT: increased quality of orientation due to reduction of wood particle orientation angle, increased strength of manufactured wood-particle boards.

2 dwg

 

The invention relates to woodworking industry and can be used in the production of chipboard.

A device for orientation of lignocellulosic particles, comprising a guide member made in the form of an endless flexible belt, and the drive to move the adjacent branches of the guide body in opposite directions with a constant speed of [the Federal Republic of Germany Patent No. 2730403, MCL5B29J 5/04. Vorrichtung zum Ausrichten von mit einem Bindemittel versehenen lignozellulosehaltigen Teilchen, 1980].

A device for the orientation of the wood particles, comprising an endless flexible body configured to move its neighboring branches in opposite directions at a constant speed by means of drive [A.S. USSR №1449344, MCL6B27N 3/14. Device for orienting wood particles, 1989, BI No. 1].

A disadvantage of the known devices is that by changing the length oriented wood particles and/or changing the thickness of the formed carpet at a constant rate of displacement of the flexible body, the angle of orientation of particles increases, resulting in decrease in strength produced chipboard.

A device for the orientation of the wood particles, comprising placed in a horizontal plane, an endless flexible body, adjacent branches which are mounted with the possibility of the spine move in opposite directions at a constant speed by means of drive [A.S. The USSR №1544568, MCL6B27N 3/14. Device for orienting wood particles, 1990, BI No. 7].

A disadvantage of the known device is that the constant speed movement of the flexible body is optimal only for a certain length of oriented particles, in which the strength of the manufactured plates maximum. In the manufacture of plates of particles of greater or lesser length of the orientation angle α increases, which causes a decrease in the strength of manufactured boards.

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

The technical result from the use of the invention is to improve the quality orientation by reducing the angle of orientation of the wood particles, which increases the strength of manufactured chipboard.

This is achieved by a device for the orientation of the wood particles, comprising placed in a horizontal plane, an endless flexible body, adjacent branches which are mounted for movement in opposite directions at a constant speed by means of a drive according to the invention is equipped with a sensor thickness bonded carpet, the sensor mass of wood particles, detector, three blocks of tasks, a subtraction unit, a unit root extraction, two units of the division, a unit of nonlinearity, block multiplication, switch elem and amp moreover, the outputs of the first block of the task and the output of the thickness gauge bonded carpet connected with the inputs of the subtraction unit, the output of which through the unit root extraction is connected with the second input of the first unit, the output of the second unit assignments connected to the first inputs of the units of the division, to the second input of the second unit through the detector connected to the output of the sensor mass of wood particles, the output of the second unit through the power of nonlinearity is connected with the second input of the multiplication to the first input of which is connected to the output of the first unit, the output of block multiplication connected with the second input, the first input connected the output of the third block of the task and the output through the amplifier - driven flexible body.

The proposed device for the orientation of the wood particles is distinguished by the introduction of the thickness gauge bonded carpet, the sensor mass of wood particles, detector, three blocks of tasks, block subtraction unit root extraction, two blocks dividing unit nonlinearities block multiplication, switch and amplifier, and connections between the blocks.

Improving the quality of orientation is achieved by moving the flexible body with the speed at which there is maximum orientation of wood particles, regardless of the length of the particles and the thickness of the formed strand of carpet.

In Fig. presents a structural diagram of the device, figure 2 - characteristics of the block nonlinearity.

Device for orienting wood particles contains placed in a horizontal plane, an endless flexible (aka smart) body 1, made in the form of endless filaments or tape, envelope rollers 2 and the drive roller 3, which is driven by a drive 4, made for example in the form of an electric motor with a gearbox (not shown). The device is equipped with a sensor 5 mass of wood particles, made for example in the form of sensor IRDM-1 [Youthlaw Intensification of production of chipboards.- M: Genre Differences. Prost, 1989. - 192 S., str], placed over the flexible body in the stream of wood particles, the detector 6, 7 gauge thickness bonded carpet, made for example in the form of a potentiometer. The device also contains three blocks of tasks 8, 9 and 10, block 11 subtraction unit 12 root extraction, two unit 13, and 14, block 15 of nonlinearity, block 16 multiplication, the switch 17 and the amplifier 18, and the output of the first block 8 of the job and the output of the sensor 7 of the chip thickness of the Mat is connected to the input unit 11 subtraction, the output of which through the block 12 root extraction is connected with the second input of the first block of the 13th division, the output of the second unit 9 jobs connected to the first inputs of blocks of division 13 and 14, to the second input of the second block 14 division through the detector 6 is connected to the output of the sensor is 5 mass of wood particles, the output of the second block 14 division connected through the block 15 of the nonlinearity with the second input unit 16 of the multiplication to the first input of which is connected to the output of the first block 13 division output unit 16 multiplication connected with the second input of the switch 17, the first input of which is connected to the output of the third unit 10 jobs, and output through an amplifier 18 to the actuator 4 of the flexible body 1.

The device operates as follows. The voltage of the first unit of task 8, is set proportional to the distance H0between the plane of the flexible body 1 and the plane of the forming conveyor, the voltage of the second unit of task 9 is proportional to the distance h between the adjacent branches of the flexible body 1 (step orientation), and the voltage of the third block of task 10 is proportional to the initial velocity V of movement of the flexible body 1, the Switch 17 is set in position 1.

By means of the actuator 4 moves the flexible body 1, adjacent branches which move in opposite directions with speeds proportional to the voltage supplied from the third unit assignments 10. Drive the forming conveyor, the chips are served on the flexible body 1, and a portion of the particle stream flows around the sensor 5 mass of wood particles. After the thickness of the bonded carpet reaches the calculated value of Hto(via 4-20 seconds after the structure is key), the switch 17 is installed in position 2.

Edge angle at which the gathering particles from the branches of the flexible body:

where h is the distance between adjacent branches of the flexible body 1 (step orientation), m;

l is the length of the oriented particles, m

Particles impinging at an angle smaller αbegpass flexible body l without rotation, and the particles impinging at an angle greater αbegfold the branches of the flexible body 1 and placed on the forming conveyor in bonded carpet. The thickness of the formed strand Mat is measured by the thickness gauge particle Mat 7, and the sensor 7 is configured so that the signal at its output proportional to half the thickness of bonded carpet N0. The signal at the output of the subtractor 11 is proportional to the value (H0-0,5·Hto), the output unit root extraction 12 - sizeand the output of the first block 13 dividing the magnitude of the sensor outputFrom the output of the sensor 5 mass of wood particles pulse signal (the number of pulses is proportional to the number of particles, and the amplitude of the mass of particles) to the input of the detector 6, the output of which is an analog signal proportional to the average mass, and, consequently, the average length of wood particles l. With the release of the second block 14 dividing the signal is, proportional to the ratio h/l, is fed to the input of block 15 of the nonlinearity, the output of which a signal is generated U15proportional to the value ofIn block 16 multiplying this signal is multiplied by the output signal of the first block of the 13th division, and the output unit 16, a signal is generated proportional to the value ofThis signal through the switch 17 and the amplifier 18 and is supplied to the actuator 4, which moves the flexible body 1 with a speed:

where the coefficient 0,0193 is the product of the amplification unit multiplying 16, amplifier 18, the gear ratio of the actuator 4, consisting of a gear ratio of the motor gear ratio of the gearbox and the radius of the drive roller 3 and has the dimension. The speed of the flexible body V has dimensionThe speed of the flexible body V has the dimension of m/S.

By increasing the length l oriented wood particles the initial angle at which the gathering particles from the branches of the flexible body is reduced, the particles are placed in the carpet "Prirazlomnoye". The amplitude of the signal at the output of the sensor 5 mass of wood particles increases, the signal at the second input of the second unit 14 increases and output decreases, the signal U15 output unit 15 of the nonlinearity decreases the dependence in figure 2), the signals at the output of block 16 of multiplication and the output of the amplifier 18 is also reduced, the moving speed of the flexible body 1 is reduced, and the turn angle of the particles during the fall in bonded carpet is also reduced, so the angle of packing of particles in the carpet (orientation angle) will be minimal.

With increasing thickness of the bonded carpet Ntofor example, because of the transition to the manufacture of plates of greater thickness, the angle of spread of wood particles during their fall to the carpet is reduced, the particles are placed in the carpet "nedorazvitie". The signal at the output of the sensor 7 thickness bonded carpet increases, and at the outputs of block 11 and subtraction unit 12 root extraction is reduced, therefore, the signals at the output of block 13 division, block 16 multiplication and amplifier 18 increases, the speed of the flexible body is increased, and the angle of spread of the particles also increases. The angle of orientation of particles will also be minimal.

Thus, the proposed device implements the method of the orientation of the wood particles [Patent 2315689 Russian Federation, IPC B27N 3/14. The way the orientation of the wood particles / carpenters S.M.; applicant and patentee Sibir. technologist, in-so - Bid No. 2006122908/12; Appl. 27.06.2006; publ. 27.01.2008. Bulletin no.3]. At this speed flexible (guide) body orientation angle, stacked in a bonded carpet wood particles m is the minimum, and durability of manufactured chipboard maximum.

Device for orienting wood particles, comprising placed in a horizontal plane, an endless flexible body, adjacent branches which are mounted for movement in opposite directions at a constant speed by means of the actuator, characterized in that the device is provided with a thickness gauge bonded carpet, the sensor mass of wood particles, detector, three blocks of tasks, a subtraction unit, a unit root extraction, two units of the division, a unit of nonlinearity, block multiplication, a switch and an amplifier, and the output of the first unit assignments and the output of the thickness gauge strand Mat are connected to the inputs of the subtraction unit, the output of which through the unit root extraction is connected with the second input of the first unit, the output of the second unit assignments connected to the first inputs of the units of the division, to the second input of the second unit through the detector connected to the output of the sensor mass of wood particles, the output of the second unit through the power of nonlinearity is connected with the second input of the multiplication to the first input of which is connected to the output of the first unit, the output of block multiplication connected with the second input, the first input connected to the output of the third block of the task and the output through the amplifier - driven flexible body.



 

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