Wood particle orientation device

FIELD: mechanics.

SUBSTANCE: wood particle orientation device incorporates chip mass pickup connected, via amplitude detector and filter, to the first multiplication unit, its second input being connected to the mat thickness pickup. The multiplication unit output is connected, via evolution unit and scaling amplifier, to the summing amplifier first input, its second input being connected to the positioning drive input. Note that the positioning drive con-rod is linked up with one of the plates arranged parallel to orientation direction.

EFFECT: higher quality of wood particles orientation.

1 dwg

 

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

A device for orientation pitched lignocellulosic particles, comprising a flexible body made in the form of an endless belt, a neighboring branch which is arranged to move in opposite directions [the Federal Republic of Germany Patent No. 2730403, M CL529J 5/04. Vorrichtung zum Ausrichten von mit einem Bindemittel versehenen lignozellulosehaltigen Teilchen. 1980].

The disadvantage of this device lies in the constant distance between the branches of the flexible body. Short oriented particles are flexible body without rotation (orientation), and long particles directly into three or more branches, are not flexible body. Thus, in this unit as guidance reduced.

A device for the orientation of the wood particles, comprising a system of interconnected articulated slats placed on them rollers, around endless flexible body adjacent the working branch which move in opposite directions, pneumatic cylinder, the piston rod of which is connected to one of the bars parallel to the direction of orientation, the processing unit, direct and inverted outputs of which through the power amplifiers connected to the electromagnetic who itim valves, placed at the inlet and outlet pipes of the pneumatic cylinder [SU # 161334, M CL B27N 3/14. Device for orienting wood particles, 1990, BI No. 46].

In the known device automatic cleaning of the flexible body from large particles, however, the step orientation can only accidentally match the length of the oriented particles, and therefore the quality of the orientation will be low.

A device for the orientation of the wood particles, including a system of interconnected articulated slats placed on them rollers, around endless flexible body adjacent workers whose branches are moving in opposite directions [SU # 1449344, M CL6B27N 3/14. Device for orienting wood particles, 1989, BI No. 1].

In this device, the change of the distance between adjacent working branches of the flexible body (step orientation hg) is only possible manually. However, the dimensions of the oriented particles are changed in the production process, so step orientation not always be optimal (according to the criterion of maximum number of oriented particles). This reduces the quality of the orientation, i.e. the quality of the finished plate.

The greatest number of particles without clogging the device will be oriented at a ratio of hg/l=0.5, where hg- the distance between adjacent working branches of the flexible body (step orientation);

l is the length of the oriented particles.

When the ratio of hg/l less than 0.5, the probability of clogging device particles fallen by more than two branches of the flexible body. When the ratio of hg/l more than 0.5 decreases the number of oriented particles. When hg>l particles either do not fall on the branches of the flexible body, or fall only on one branch, so their spread (orientation) will not, as the orientation is deteriorating.

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 of the wood particles.

The technical result is achieved in that the device for orientation of wood particles, comprising a system of interconnected articulated slats placed on them rollers, around endless flexible body adjacent the working branch which move in opposite directions, according to the invention includes a weight sensor chip, the sensor thickness of the carpet, the displacement sensor rod, the amplitude detector, the filter, the power multiplication unit root extraction, scaling and summing amplifiers and positional actuator, and a weight sensor chip through the amplitude detector and a filter connected to the first input of the multiplication to the second input of which is connected to the gauge thickness of the carpet, the output of block multiplication through the unit root extraction and scaling amplifier connected to the first input of summing amplifier, the second input is connected to the displacement transducer shaft, and the output connected to the input position of the actuator, the stem of which is connected to one of the bars parallel to the direction of orientation.

The proposed device for the orientation of the wood particles has a weight sensor chip, the sensor thickness of the carpet, displacement sensor rod, the amplitude detector, filter, block multiplication unit root extraction, scaling and summing amplifiers and position of the actuator, as well as relationships between data elements.

Improving the quality orientation of the wood particles is achieved by automatically maintaining the optimal ratio of the step orientation and length of the oriented particles, which focuses max particles without clogging the device.

The drawing shows a block diagram of the device.

Device for orienting wood particles consists of a system of bars 1, connected by a hinge, placed on them by the rollers 2, around an endless flexible body 3 adjacent the working branch which is arranged to move in opposite directions on the box 4 through the drive rollers 5. Device which contains about sensor 6 mass shavings, for example, the type of IRDM-1 [ULEV I.A. Intensification of production of chipboards. - M.: Genre Differences. prom the terrain, 1989, page 149]installed in the stream fed to the orientation of the chip. The sensor 7, the thickness of the carpet is installed over the formed strand carpet directly after orienting device and executed, for example, in the form of a potentiometer. The device also includes a sensor 8 move the rod, the amplitude detector 9, a filter 10, block multiplication 11, unit root extraction 12, the scaling amplifier 13, summing amplifier 14 and the positional actuator 15, made for example in the form of a direct current motor and transmission screw-nut, which is connected with the rod 16. The sensor 6 of the mass of the chips through the amplitude detector 9 and a filter 10 connected to the first input of block multiplication 11, to the second input of which is connected to the sensor 7, the thickness of the carpet, the output of block multiplication 11 through the block to retrieve the root 12 and the scaling amplifier 13 is connected to the first input of summing amplifier 14, the second input is connected to the sensor 8 of the moving rod, and the output connected to the input position of the actuator 15, the piston rod 16 of which is connected to one of the bars 1, parallel to the direction of orientation. Stroke length D of the stem 16:

D=dmax-dmin,

where dmaxdmin, respectively, the distance between the extreme working ve is vami flexible body in the uncompressed and the compressed position of the slats 1.

Step orientation hgand the length D of the piston rod 16 connected by the relation

m - number of employees of the branches of the flexible body (in the drawing, m=6. Here d=dminhg=min because of the strap l is shown in a compressed position).

Considering the optimal ratio of hg/l=0.5, subject of formula (1) will get necessary to maintain the optimal ratio of hg/l change the stroke length of the spindle 16:

where Δl - change the length of the wood particles.

The amount of wood particles (chips) equals l·b·h,

where l, b, h are respectively the length, width and thickness of a particle.

Length, width and thickness of the chip are connected by a certain ratio, so the amount of particles can be expressed through one of its linear dimensions, for example through the length of it · l3,

where K - coefficient of proportionality.

For example, in [Potashev PU, Lapshin YG Mechanics of wood-based panels. - M.: Genre Differences. prom the terrain, 1982, pages 49-50] it is recommended that a rational ratio of 1:b:h=100:10:1. When this is expressed in the length of the particle volume is equal to l·10-3i.e. the proportionality factor K=10-3.

The device operates as follows.

The distance between adjacent branches of the flexible body 3 (step orientation hg), located above the window 4 set such that it is taulealo half medium length oriented particles. The gain of the amplifier 13 is set tofor example , when m=10, K=10, this ratio has a value of 45.

Drive the drive rollers 5, which moves the flexible body 3, and its neighboring branches move in opposite directions. Drive the forming conveyor (the drawing is not marked). Wood particles through the window 4 and serves on the formation of the Mat. Particles that fell parallel to the branches of the flexible body 3 (direction of orientation), fail to form the conveyor, and the particles that fell perpendicularly or diagonally to the direction of orientation, are deployed in adjacent branches of the flexible body 3 and fail to form the conveyor parallel to the direction of orientation. Thus, by forming the conveyor is formed by a Mat of oriented particles.

When resizing supplied to the orientation of the particle pulses from the sensor 6 of the mass of chips will vary in proportion l3. This signal is detected in a peak detector 9 and is fed to the input of the filter 10, the time constant is chosen inversely proportional to the period of particle collisions with the sensor 6 (the drawing is not marked). At the output of filter 10 is a signal proportional to the average mass of a particle, i.e. proportional to the amount the e ρ d··l3,

where ρdthe density of wood particles (chips).

This signal is fed to the first input of the multiplication 11. When working forming machine with volumetric mass dosing [Schwartzman G.M., Generously D.A. Manufacture of chipboard. - M.: Genre Differences. prom the terrain, 1987, str] with the increasing density of the chip is automatically reduced the quantity of chips, i.e. decreasing the thickness of the formed strand of carpet in the constancy of its mass. Therefore, the thickness bonded carpet Ntowill be inversely proportional to the density of wood shavings ρd. The output signal from the sensor 7, the thickness of the carpet, proportional to the value of l/ρd, is applied to a second input of the multiplication 11, the output of which is a signal proportional to·l3. This signal is fed to the input of unit root extraction 12, the magnitude of the signal is extracted cube root, and the output of block 12 is a signal proportional to the length of the oriented chips. This signal is input to the scaling amplifier 13 with a gain equal toat the output of the amplifier 13 is a signal proportional to the stroke length of the piston rod 16, corresponding to the formula (2). This signal is fed to the first (negative) input of summing is silicula 14, on the second (positive) input of which is fed the signal from the sensor 8 move the piston rod 16. Differential amplified signal output from the amplifier 15 is applied to the input position of the actuator 15, which moves the rod 16 to the amount at which the signals on the first and second inputs of the summing amplifier will not be compared. When the rod 16 is ejected position by the actuator 15 to the value, at which step the orientation of the flexible body 3 hgwill be half the length of the oriented particles.

When increasing the length of the oriented particles the signal at the output of the filter 10 will increase the signal at the output of block multiplication 11 increases, the signal at the output of the scaling amplifier 13 will also increase, and the output of summing amplifier 14 will decrease. The piston rod 16 moves in the direction in which step the orientation of the flexible body 3 will increase and become equal to half the length of oriented wood particles.

When increasing the density of the oriented particles without increasing their length (for example, when wood is more hard rock) the signal at the output of the filter 10 and the first input of the multiplication 11 will increase the height of the bonded carpet will decrease, so the signal at the second input of the multiplication 11 is also reduced, the signal at the output of block multiplication 11 will not change. The position of the rod 16 and the step orientation will not change.

The device on which iently wood particles, comprising a system of interconnected articulated slats placed on them rollers, around endless flexible body adjacent branch which is arranged to move in opposite directions, characterized in that the device comprises a weight sensor chip, the sensor thickness of the carpet, the displacement sensor rod, the amplitude detector, the filter, the power multiplication unit root extraction, scaling and summing amplifiers and positional actuator, and a weight sensor chip through the amplitude detector and a filter connected to the first input of the multiplication to the second input of which is connected to the gauge thickness of the carpet, the output of block multiplication through the unit root extraction and the scaling amplifier connected to the first input of summing amplifier, the second input is connected to the displacement transducer shaft, and the output connected to the input position of the actuator, the stem of which is connected to one of the bars parallel to the direction of orientation.



 

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