Device for wood particles orientation

FIELD: mechanics.

SUBSTANCE: device consists of endless working tool, located in horizontal plane above shaping conveyer, neighbour branches of the working tool are able to move into opposite directions by means of drive. Device also comprises the task setting unit, generator of ultrasonic oscillations, two pairs of ultrasonic emitters-receivers, two detectors, two differential amplifiers and regulator.

EFFECT: increase of durability of fabricated wood-particle boards.

2 dwg

 

The invention relates to woodworking industry and can be used in the production of wood-based panels of oriented chips (OSB plates).

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, M CL529J 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 [SU # 1449344, M CL627N 3/14. Device for orienting wood particles, 1989, BI No. 1].

A disadvantage of the known device lies in the fact that with the change of the length of oriented wood particles at a constant rate of displacement of the flexible body, the angle of orientation of the particles increases, and the strength of manufactured wood boards is reduced.

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 the opposite healthy lifestyles is at a constant speed by means of drive [SU # 1544568, M CL627N 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 plate maximum. In the manufacture of plates of chips of a different size, the orientation angle shavings α increases, which leads to loss of 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 can increase the strength of the produced particle Board.

The technical result is achieved in that the device for orientation of wood particles, comprising placed over a forming conveyor in a horizontal plane, an endless flexible body, adjacent branches which are located at a distance h from each other and arranged to move in opposite directions by means of a drive according to the invention, equipped with a unit job, the generator of ultrasonic vibrations, the two detectors, two differential amplifiers, controller, and two pairs of ultrasonic shall luchtel receiver, posted by angle ±(30...60°) relative to the longitudinal axis of the strand carpet, located at a distance h/2 from its edge, and the generator output is connected to the emitters, the outputs of the receivers through the detectors are connected to inputs of the first differential amplifier, the output of which is connected to the second input of the second differential amplifier, the first input connected to the block of the task and the output through the controller connected to the actuator flexible body.

The proposed device for the orientation of the wood particles is distinguished by the introduction of unit assignments, generator of ultrasonic vibrations, two pairs of ultrasonic emitter-receiver, two detectors, two differential amplifiers and controller.

Improving the quality of orientation is achieved by automatically maintaining such speed of movement of the flexible body, in which the orientation angle (stacking) of wood particles relative to the direction of motion of the particle Mat is minimal.

Figure 1 presents the layout of the device, figure 2 - structural diagram of the device.

Device for orienting wood particles contains placed in the horizontal plane of the flexible body 1, made in the form of endless filaments or tape, envelope rollers 2. Neighboring branches of the flexible body is located at a distance h each on the other and is arranged to move in opposite directions. The drive roller 3 is driven in rotation by the actuator 4, made for example in the form of an electric motor with a gearbox (not shown in figure 1). The device has a unit of task 5, the generator 6 of the ultrasonic oscillation frequency 40...60 kHz, two pairs of ultrasonic emitter-receiver 7-9 and 8-10 installed symmetrically at an angle β=±(30...60°) relative to the longitudinal axis of the strand carpet stretching over a distance h/2 from the edge of the carpet. The device also contains two detector 11 and 12, two differential amplifier 13, 14 and the controller 15, made for example in the form of the PID controller, and the output of the generator 6 is connected to the emitters 7 and 8, the outputs of the receivers 9 and 10 through the detectors, respectively 11 and 12 are connected to inputs of the first differential amplifier 13, the output of which is connected to the second input of the second differential amplifier 14, a first input connected to the unit task 5, and the output through the controller 15 is connected to the actuator 4 of the flexible body.

The device operates as follows.

The output voltage of the unit task 5 set the speed V of movement of the flexible body 1. By means of the actuator 4 moves the flexible body 1, adjacent branches which move in opposite directions. Chips are served on the flexible body 1. Edge angle at which the gathering particles from the branches of the flexible body, one is by the initial turn angle of the particles in the fall

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 less αbegpass the flexible body 1 without rotation, and the particles impinging at an angle greater αbegfold the branches of the flexible body 1 and placed on the forming conveyor (Fig. not labeled) in a bonded carpet, and the final angle stacking α and (orientation angle) depends on the initial angle αbegi.e. the length of the particle and the speed of its spread, i.e. the speed of the flexible body 1 V.

The emitter 7, the radiation direction which makes an angle β=+(30...60)° relative to the longitudinal axis of the strand carpet, emits ultrasonic vibrations of a frequency of 40...60 kHz, which, reflected from the surface bonded carpet, recovered by the receiver 9, and the closer the angle |α1| (between the axis of the chip and the radiation direction of the emitter 7) to 90°, the more scattered ultrasonic vibrations, and the smaller the signal sensed by the receiver 9, and the smaller the angle |α1|, the greater the magnitude of the signal picked up by the receiver 9. Works similarly a pair of emitter 8-receiver 10, the radiation direction which makes an angle β=-(30...60)° relatively lengthwise the axis of the strand carpet.

The output signal of the receiver 9 is detected by the detector 11 and is supplied to the second (negative) input of the amplifier 13 and the output signal of the receiver 10 is detected by the detector 12 and is supplied to the first (positive) input of the amplifier 13. The output signal of the differentiating amplifier 13 is proportional to the difference of the signals at its first and second inputs, i.e. proportional to the angle of orientation of the chip α (relative to the direction of movement of the carpet) on the side surface of the bonded carpet. Since the step orientation h of all branches of the flexible body 1 is the same, the orientation angle shavings α absolute value will be the same across the surface of the carpet. The output signal of the amplifier 13 is supplied to the second (negative) input of the differential amplifier 14, the first (positive) input of which is fed sets the signal from the unit assignments 5. The output signal of the amplifier 14 is proportional to the difference between the signals at its first and second inputs, via the controller 15 is supplied to the actuator 4 and sets the moving speed of the flexible body 1.

With increasing length applied to the chip control the angle of vanishing branches with flexible body αbegdecreases, the thickness of the carpet is Prirazlomnoe", in this case the angle between the axis of the chip and the radiation direction of the emitter 7 |α1| becomes greater than the angle between the axis of chips and such is the pressure of the radiation emitter 8 |α 2| (figure 2), the signal at the first input of the amplifier 13 will have a better signal on its second input, the output voltage of the amplifier 13 is positive, this voltage is subtracted from the voltage reference in the differential amplifier 14, the output voltage of the amplifier 14 is reduced, this reduction through the regulator 15 is transmitted to the actuator 4, the moving speed of the flexible body 1 will be reduced, and the turn angle of the chip is also reduced, tending to zero the corner.

If the length of the supplied chip will decrease the angle αbegwill increase, the chips in the carpet will be "nedorazvitosti", and the angle |α1| will be less than the angle |α2|, the signal at the first input of the amplifier 13 will be less than the signal at its second input, the output voltage of the amplifier 13 becomes negative, the output voltage of amplifier 14 increases, the speed of movement of the flexible body 1 will increase, and the turn angle of the chip will increase, tending to zero the corner.

The signals on the first and second inputs of the amplifier 13 will be equal in magnitude, the output signal of this amplifier will be zero, and the moving speed of the flexible body 1 does not change when the minimum angle of orientation of the chip, i.e. α=min if |α1|=|α2|. Thus, the signals from the detectors 12 and 13 automatically set the speed of movement of the flexible body 1, when the cat is Roy orientation angle of the total number of chips on the surface of the carpet is minimal.

The optimum speed of movement of the flexible body of the proposed device also automatically installs when you change the thickness of the supplied chips. For example, increasing the thickness of the chip rate of fall increases, the time of flight before laying the carpet is reduced, the chip is "nedorazvitosti", and the process of controlling the speed of movement of the flexible body is repeated.

The invention will improve the quality of wood-based panels of oriented chips (OSB plates).

Device for orienting wood particles, comprising placed over a forming conveyor in a horizontal plane, an endless flexible body, adjacent branches which are located at a distance h from each other and arranged to move in opposite directions by means of the actuator, characterized in that the device is provided with a unit job, the generator of ultrasonic vibrations, the two detectors, two differential amplifiers, controller, and two pairs of ultrasonic emitters-receivers placed at an angle ±(30-60°) relative to the longitudinal axis of the strand carpet, located at a distance h/2 from its edge, and the generator output is connected to the emitters, the outputs of the receivers through the detectors are connected to inputs of the first differential amplifier, the output is d which is connected to the second input of the second differential amplifier, first input connected to the block of the task and the output through the controller connected to the actuator flexible body.



 

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