KR101544362B1 - Sorting device for wood flour - Google Patents

Abstract

The present invention relates to a selector for a wood powder production apparatus wherein the wood power production apparatus pulverizes wood material to powder-shaped wood powder and thereby manufactures wood powder and the selector separates an put pulverization material into wood powder of substandard particle size and wood powder of above-standard particle size wherein the selector comprises: a rotating shaft rotating in the opposite direction of a screen drum on a receiving portion of the screen drum so that a selection efficiency can be maximized; and a separation means coupled to the rotary shaft and comprising a first and second rotators each having a brush and a blowing wing.

Description

[0001] SORTING DEVICE FOR WOOD FLOUR [0002]

The present invention relates to a sorting machine for sorting a pulverized material into pulverized material having a particle size smaller than a reference particle size and a non-pulverized particle having a larger particle size than a reference particle size in a wood particle manufacturing apparatus manufactured by pulverizing a wood raw material into powdered wood powder, And a second rotating powder body which is coupled to the rotating shaft and has a brush and an air blading blade, the rotating shaft being rotatable in a direction opposite to the screen drum on the receiving portion of the screen drum, The present invention relates to a discriminating apparatus for a wood-milling apparatus.

Generally, wood flour refers to wood particles having a certain particle size (about 0.3 mm) or less produced by crushing or crushing various kinds of wood raw materials, and is widely used for industrial use, industrial use such as pile materials for pens, agricultural use, and crops.

These wood floures need to be screened by particle size according to the application or to screen the pulverized or unbranched pulverized material. In other words, since the wood powder has commercial properties only if uniformity below the reference particle size is ensured according to the application, the wood powder production apparatus includes a pulverizer and a separator other than the rectifier.

In general, a sorting machine equipped with a screwdriver is used as a sorting machine provided in a wood-block manufacturing apparatus. A screwdriver is used as a sorting machine. The screwdriver is installed in a cylindrical drum having a screening net on the bottom surface thereof so as to rotate the screw, , And the lower and upper grades of wood are selected and discharged through the screening net on the floor, respectively.

In this way, the non-wood particles selected by the screw separator are introduced into a pulverizing machine and then pulverized or crushed again, and then re-screened again through a screwdriver, so that only wood having a reference particle size or less is put into the machine, do.

However, in the conventional screw sorting machine, since the selection of the wood and the non-wood is performed only at the bottom of the pipe, not only the selection amount is smaller than the selection time but also the screening efficiency is lowered due to the aggregation of the pulverized material at the bottom of the pipe at the time of sorting, There is a problem.

Particularly, when the water content of the pulverized product is a function of water, the pulverized product is more easily aggregated, so that the screening efficiency and screening time become very long, and the inside of the tube of the screw separator is frequently cleaned.

For reference, as a prior art relating to a sorting machine that can be employed in a wood flour manufacturing apparatus, Japanese Patent Registration No. 10-0960366 (May 20, 2010) entitled " sawdust shredding machine using pulpwood, sawdust and wood flour manufacturing apparatus using the same, Japanese Patent No. 10-1437854 entitled "Sawdust or Wood Chip Sorter ", and Registered Patent No. 10-0462813" Aggregate Production Apparatus ".

Accordingly, the present invention has been made to solve the above-mentioned problems,

It is possible to prevent the aggregation of the pulverized product at the time of sorting, thereby improving the sorting efficiency of the wood and non-wood products, and making it possible to perform continuous sorting without requiring any separate cleaning work, thereby shortening the sorting time and increasing the sorting amount And a brush which contacts the inner wall of the screen netting, and which is installed to rotate in a state where the screen drum is inclined toward the non-mass outlet, And a tearing means composed of at least one first rotating powder and at least one second rotating powder having a plurality of blades.

In order to minimize the mutual interference between the brushes and the blades and to improve the screening efficiency due to the centrifugal force, the first and second rotating powders each have a rear end with respect to the rotation axis, And is connected in a slant or spiral manner so as to be positioned in the direction of rotation.

Further, according to the present invention, even if the rotational speed of the tearing means is not increased, the wind pressure generated by the air blades is increased so that the amount of wood powder to be separated by the centrifugal force is increased in a short time, And a striking plate striking an inner wall of the screen net by swinging so as to improve the desorption effect of the pulverized material sandwiched by the screen netting.

In order to accomplish the above object, the present invention provides a wood-

A wood powder manufacturing apparatus for pulverizing a wood raw material into a powder form, comprising: a sorting device for sorting the pulverized material into a powder having a particle size smaller than a reference particle size and a particle size greater than a reference particle size,

A screen drum having a receiving portion formed in a screen net having a plurality of wood particle discharging holes, a pulverized water input port communicating with one side of the receiving portion, and a non-magnetic particle outlet connected to the other side of the receiving portion;

Rotating means for rotating the screen drum in one direction;

Height adjusting means for adjusting the height of the screen drum so that the screen drum is inclined downward from the charging port toward the discharging port; And

At least one first rotating powder having a rotating shaft installed to rotate in a direction opposite to the screen drum in the receiving portion and a brush coupled to the rotating shaft and contacting the inner wall of the screen netting, And at least one second rotating powder body having an air blading blade.

In the separator for a wood-powder manufacturing apparatus according to the present invention

The first rotating powder and the second rotating powder are

And the rear end is coupled to the rotary shaft such that the rear end thereof is positioned in the rotational direction of the rotary shaft rather than the front end.

Further, in the discriminating device for a wood-powder manufacturing apparatus according to the present invention

The blades

And the rear end of the second rotating powder is connected to the second rotating powder in an oblique or spiral shape so that the rear end is located in the rotational direction of the rotating shaft rather than the front end.

Further, in the sorting apparatus for a wood-powder manufacturing apparatus according to the present invention,

The tearing means

And a striking plate installed on the receiving part through an elastic body and striking an inner wall of the screen net by swinging.

The discriminating apparatus for a wood-powder manufacturing apparatus according to the present invention is characterized in that the pulverized material is sorted into wood and non-wood by centrifugal force to increase the sorting amount, and particularly to the brush and the brush which rotate on the receiving portion of the screen drum in the direction opposite to the rotation of the screen drum It is possible to prevent separation of the pulverized material in the screen drum and to prevent the pulverized material from being caught in the screen netting and to improve the screening efficiency so that a large amount of wood and non- It is very versatile and effective because it can be sorted.

In addition, according to the present invention, there is provided a sorting device for a wood-powder manufacturing apparatus, comprising: a first rotating powder having a brush; a second rotating powder-containing blade having blades; and a blades It is advantageous in that it is excellent in the effect of separating and sorting the pulverized material through the brush and the air blades, and it is not necessary to separately perform internal cleaning of the screen drum.

In addition, the separator for a wood-powder manufacturing apparatus according to the present invention is a tear-off means that introduces a striking plate striking an inner wall of a screen net by rotational vibration of a clean drum to perform dropping of wood powder through a wood- It is possible to improve both the efficiency of discharging the non-aliquot through the non-aliquot outlet.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view for explaining the entire configuration of a wood-powder production apparatus employing a sorter according to the present invention; Fig.
2 is a view for explaining a configuration of a sorter according to the present invention.
FIG. 3 and FIG. 4 are an assembled perspective view and a first exploded perspective view of a screen drum in the sorter according to the present invention. FIG.
5 is a cross-sectional view and a longitudinal cross-sectional view of Fig.

While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

 In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

It is to be understood that the first to second aspects described in the present specification are merely referred to in order to distinguish between different components and are not limited to the order in which they are manufactured, It may not match.

In the description of the sorter for a wood-powder manufacturing apparatus according to the present invention, when an unambiguous approximate direction reference is specified with reference to FIG. 3 for convenience, the direction in which the gravity acts on the basis of the non- The directions are specified in accordance with these standards unless otherwise specified in the detailed description and claims of the invention relating to other drawings.

First, referring to FIG. 1, a wood powder manufacturing apparatus capable of employing the sorter according to the present invention will be described. The wood powder manufacturing apparatus mainly comprises a hopper 10 into which pulverized products obtained by first pulverizing wood raw materials are charged, (Not shown) for sorting and separating foreign matter from the selected wood powder, and conveying means 20 for separating and conveying the pulverized material, wood powder, and non-wood powder separately from the selected wood powder ).

Firstly, the pulverized product of the present invention means a pulverized product obtained by pulverizing wood materials such as sawdust, wood chip, and waste wood produced after wood processing in various industrial fields through primary pulverization (in case of sawdust, ) Means all kinds of wood.

The hopper 10 and the sorter 100 are provided with first and second screw conveyors 11 and 111 under the hopper 10 and the separator 100. The first and second screw conveyors 11 and 111 are disposed below the hopper 10 and the sorter 100, Third and fourth screw conveyors 21 and 22 are provided as the conveying means 20 and a fifth screw conveyor 112 is provided at the non-concentrate discharge port 125 of the sorter 100.

The pulverized material transferred from the hopper 10 through the first and third screw conveyors 11 and 21 is sorted into a fraction less than the reference particle size and a non-particle fraction larger than the reference particle size in the sorter 100,

The wood flour selected in the sorting machine 100 is introduced into the regulator through the second and fourth screw conveyors 111 and 22 so that the foreign substances are secondarily sorted,

The selected fractions are introduced into a hopper 10 through a fifth screw conveyor 112, and are then secondarily crushed and then introduced into the hopper 10 again.

The sorting and the sorting of foreign matter are performed repeatedly at the separator 100 and the rectifier so that only fine powder-like particles having a particle size below the reference particle size are finally shipped.

The hopper 10, the rectifier, the crusher, and the first to fifth screw conveyors 11, 21, 22, 111, and 112 are known techniques that can be employed in a conventional general wood- The description of the structure and configuration is omitted.

The present invention relates to a sorter (100) that can be employed in a wood powder manufacturing apparatus in which the above operation is performed,

2 to 5, a discriminating apparatus 100 for a wood-powder manufacturing apparatus according to the present invention will be described with reference to the accompanying drawings.

The separator 100 according to the present invention includes a screen drum 120 installed at an upper portion of a frame 101, a rotating means 130 for rotating the screen drum 120, a screen drum 120, A tearing means 150 installed to rotate inside the screen drum 120 and a discharge means 110 installed at a lower portion and a front portion of the screen drum 120, ).

The screen drum 120 is a drum-shaped member having a predetermined length and is housed in a housing 102 fixedly coupled to an upper portion of the frame 101. The housing 102 is provided with an openable / (Cleaning is carried out in order to prevent the inclusion of pulverized material in the case of sorting different kind of pulverized material (for example, pulverized material having different kinds of wood) through one sorting device 100 , Which should be understood in a different meaning from cleaning to remove lumps and creases of the crushed material described later).

As a discharge means 110 of the present invention, the second screw conveyor 111 is installed at a lower portion of the screen drum 120 to collect wood particles dropped through the screen drum 120, and discharge the wood particles to the third screw conveyor 21 And the fifth screw conveyor 112 is disposed on the particle outlet 125 of the screen drum 120 so as to discharge and discharge the separated particles discharged through the screening to the crusher. As described above, In the following description, a detailed description of the present invention will be omitted for the sake of conciseness.

2 to 5, the screen drum 120 is constituted by a screen net 121 in which a plurality of wood particle discharging holes 122 are perforated, and the inside thereof is connected to the ground water receiving portion 123, And a particle discharge port 125 is provided on the other side of the receiving part 123. The discharge port 123 is provided at the other end of the receiving part 123,

The pulverized water inlet 124 and the non-monochromic water outlet 125 may be formed with openings at the front and rear ends of the screen net 121, and may be additionally provided with additional opening and closing members.

The wood particle discharging hole 122 has a diameter corresponding to the reference particle size so that only wood particles having a reference particle size or less can be dropped from the screen net 121 and sorted. When the screen drum 120 rotates, the pulverized material is spread and spread over the entire inner wall of the screen net 121 by the centrifugal force, so that only the wood particles falling below the reference particle size fall through the wood particle discharging hole 122 And the unsprung portion having a reference particle size or more is not passed through the wood particle discharging hole 122 but falls down on the screen net 121 due to its own weight and is discharged to the particle discharging port 125 and is introduced into the pulverizer.

One or more rails 126 formed along the circumferential direction are coupled to the outer circumferential surface of the screen net 121 in order to rotate the screen drum 120. One or more rotary rolls 131 may be used as the rotating unit 130, Is inserted into the rail 126 around the screen net 121. When the rotary roll 131 is rotated in the other direction by the motor, the rotary roll 131 and the rail 126 By the contact, the screen net 121, i.e., the screen drum 120 is rotated in one direction.

This rotation means 130 is caused by the fact that the driving shaft is difficult to engage in the longitudinal direction of the screen net 121 because the front and rear ends of the screen drum 120 are opened in the state where the screen drum 120 is embedded in the housing 102.

In the figure, a plurality of rails 126 are provided in the longitudinal direction of the screen net 121, and a pair of rotary rolls 131 are installed on both sides of the screen net 121, A screen drum 120 is shown in which a pair of rotary rolls 131 are disposed and rotated.

Reference numeral 132 denotes a motor for rotating power, 133 is a drive shaft connecting rotating rolls 131 arranged on the same line, and 134 is a chain connecting rotating rolls 131 arranged on different lines.

The height adjustment means 140 adjusts the height of the front and rear ends of the screen drum 120 to be different from each other such that the screen drum 120 is inclined downward from the charging port 124 toward the discharging port 125 And a hydraulic cylinder (not shown) capable of adjusting the height of a rear portion of the screen drum 120, that is, a portion where the inlet 124 is formed. In the figure, the front leg portion 101A of the frame 101 is height- A means is provided in which the second screw conveyor 111 together with the screen drum 120 can be inclined downward simultaneously.

The height adjusting means 140 adjusts the downward inclination of the screen drum 120 according to the average size or the number of the water drops contained in the pulverized product to adjust the sorting amount of the wood flour .

That is, when the average size of the pulverized product is large, the downward inclination of the screen drum 120 is increased so that the pulverized product can be quickly discharged onto the discharge port 125 to quickly perform the second pulverizing operation. When the average size of the pulverized product is small, The downward inclination of the screen drum 120 is lowered so that the time during which the pulverized material remains on the receiving portion 123 is increased so that the screening of the wood particles can be performed for a sufficient time.

In addition, when the water content of the pulverized product is large, the downward inclination of the screen drum 120 is increased to prevent the pulverized products from being bundled, and the pulverized pulverized product is quickly discharged onto the discharge port 125 to be secondarily pulverized, When the moisture content of the pulverized product is low, the downward inclination of the screen drum 120 is lowered so that a large amount of pulverized product is spread evenly over the screen net 121 when the screen drum 120 is rotated, thereby enabling sufficient grain sorting.

The height adjusting means 140 of the present invention satisfies the configuration in which the screen drum 120 can adjust the downward inclination, and the specific method and configuration are not limited.

Next, a description will be made of a tearing means 150 which rotates in the opposite direction to the rotation of the screen drum 120 on the receiving portion 123. FIG.

3 to 5, the tearing means 150 includes a rotation shaft 151 provided to longitudinally transverse the receiving portion 123, at least one first (not shown) And second rotating powder 152 and 155. The first and second rotating powder 152 and 155 are provided with a brush 153 and a plurality of blades 156 respectively.

Although not shown in the drawing, the rotary shaft 151 is connected to a drive means (not shown) such as a motor and rotates in the other direction, and one side (more preferably, the front side in which the inlet 124 is formed) It may be installed anywhere inside or outside the housing 102.

The first and second rotating powder 152 and 155 as the tearing means 150 are members having a length corresponding to the rotating shaft 151 and are respectively connected to the rotating shaft 151 and the plurality of connecting pieces 152A 155A,

A brush 153 provided along the longitudinal direction of the first rotating powder 152 is provided to be in contact with an inner wall of the screen net 121 and a plurality of brushes 153 provided along the longitudinal direction of the second rotating powder 155 The air blading blade 156 generates air blowing in the receiving portion 123 by rotating the rotating shaft 151,

It is possible to separate the pulverized material from the screen netting 121 or the wood netting hole 122 of the screen netting 121 or the like using the contact and the wind pressure of the brush 153 so as to efficiently sort the wood and the non- do.

Therefore, if the contact and wind pressure of the brush 153 is used, there is no need to separately clean the inside of the screen net 121 during screening,

Even if the rotating speed of the screen drum 120 is not increased, the pulverized material separated by the tearing means 150 is screened by the centrifugal force of the screen drum 120 while staying on the receiving portion 123 for a long time, The pulverized product can be selected.

Particularly, it is a main factor of the screening efficiency to be lowered that the particles of the reference particle size or more are clumped or clipped in the screen netting 121. The present invention is characterized in that, It is possible to prevent the wood particle discharging hole 122 from being clogged, and at the same time, the particle can be discharged quickly.

The first and second rotating powder 152 and 155 are connected to the rotating shaft 151 by a plurality of connecting pieces 152A and 155A. Shaped or helical shape so that the combined rotating powder is positioned in the rotational direction of the rotational shaft 151 with respect to the rotational shaft 151 at the rear end than at the front end of the rotational shaft 151, (A shape similar to the rotating blades of an electric fan).

Accordingly, when the tearing means 150 rotates, the direction of the pressure generated by the rotating powders (the direction in which the pulverized material desorbed from the screen netting 121 is tilted by the contact of the brush 153, So that the crushed material contained in the rear of the screen net 121 is uniformly distributed all the way forward so that the crushed material and the non-crushed material can be sorted.

In other words, the pulverized material that comes into contact with the rear end of the brush 153 relatively moves toward the front due to the downward inclination structure of the screen net 121 and the inclined structure of the brush 153, The generated wind pressure is not generated in a radial direction orthogonal to the longitudinal direction of the rotary shaft 151 but is generated toward the front outer side so that the pulverized product spreads evenly throughout the screen net 121, And force the compartments to move to the wood particle outlet 125 to be discharged, thereby maximizing the sorting efficiency.

The structure of the rotating powder similar to the rotating blades of the fan is also applied to the blades 156 provided in the second rotating powder 155.

That is, the fan blades 156 provided in the longitudinal direction of the second rotating powder body 155 are also inclined with respect to the second rotating powder body 155 such that the rear end is positioned in the rotating direction of the rotating shaft 151, Shaped or spiral-shaped so that each of the air blades 156 generates blowing air individually toward the front, so that even if the rotating shaft 151 rotates at a low speed, the air-wind pressure generated thereby is kept at the maximum, To increase the centrifugal force.

When the plurality of blades are arranged in a straight line in the same direction as the longitudinal direction of the second rotary powder 155 (or the integrated blades are provided) in the oblique second rotary powder 155,

Or in the case where the second rotating powder having the same straight line shape as the longitudinal direction of the rotating shaft 151 is provided with the fan blades 156 having an oblique shape,

The blowing pressure generated by the blowing blades 156 having a double slanting structure is increased as in the present invention, and the sorting efficiency can be improved.

5, the tearing means 150 of the present invention includes first and second rotary powder 152 and 155 having the brush 153 and the air bladder 156, And a striking plate 158 directly striking the inner wall of the net body 121.

The striking plate 158 is provided on the receiving portion 123 of the screen netting 121 as a plate-like member and has elastic members 159 connected to the screen netting 121 on both sides of the striking plate 158 So as to be elastically supported.

Both sides of the striking plate 158 refer to both the front and rear sides or both the right and left sides of the striking plate 158. A pair of striking plates 158 are connected to a pair of striking plates 158 or a plurality of striking plates 159 And the corresponding striking plate 158 are connected to each other so as to intersect with each other, and the inner wall of the screen net 121 can be hit by an elastic force.

Therefore, the impact plate 158 is rotated about the elastic member 159 in the forward, backward, up and down directions by the centrifugal force generated by the rotation of the screen drum 120, the vibration and the contact of the brush 153 and the wind pressure of the air bladder 156 The swing plate 158 is directly struck on the inner wall of the screen net 121 by the swinging motion so that the pulverized material (including both the wood and the non-split material) caught in the screen net 121 or agglomerated Separating and releasing means 150 for separating and releasing the toner.

That is, when the screen netting 121 and the rotary shaft 151 are rotated in opposite directions, first, centrifugal force and vibration are generated by the rotation operation of the screen netting 121, and the brush 153 is rotated by the impact plate 158 The striking plate 158 is pivoted by the pressure and the wind pressure generated by contacting the striking plate 158 and the elastic body 159. At this time, the elastic force of the elastic body 159 is added to increase the swinging width, By blowing on the inner wall of the screen net 121, the pulverized material can be desorbed.

In this case, when the cover plate 158 covers the wood particle discharging hole 122, the amount of the wood particle passing through the wood particle discharging hole 122 may be reduced. Therefore, the number of the striking plate 158, Size and the like of the screen drum 120 are suitably selected according to the specifications of the screen drum 120, that is, the front-rear length and the lateral width of the screen net 121, the diameter of the wood-

As described above, according to the present invention, by using the pressure applied to the centrifugal force and the frontward outward while the pulverized material in the receiving portion 123 spreads over the entire screen net 121 through the height adjusting means and the tearing means 150 The sorting efficiency of the wood powder and the non-wood powder is remarkably improved as compared with the conventional separator 100, thereby shortening the sorting time, increasing the sorting amount, and facilitating the use It is possible to secure both.

While the present invention has been particularly shown and described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the details of the illustrated embodiments. It will be apparent to those skilled in the art that various modifications, And substitutions are to be construed as falling within the scope of protection of the present invention.

10: hopper 11: first screw
20: a selector machine 30: a crusher
40: conveying means 21, 22: third and fourth screw conveyors
100: selector 110: exhausting means
111, 112: second and fifth screw conveyors
120: Screen drum 121: Screen screen
122: wood powder discharging hole 123: receiving portion
124: Grinding water inlet port 125: Non-particle outlet port
126: Le Mans
130: rotating means 131: rotating roll
132: motor 133: drive shaft
134: Chain
140: Height adjusting means 121: Hydraulic cylinder
150: tearing means 151:
152, 155: first and second rotating powder 153, 156: connecting piece
154: Brush 157: Air blades
158: Striking plate 159: Elastic body

Claims (4)

1. A sorter (100) for sorting a pulverized material into a powder having a particle size smaller than a reference particle size and a particle size smaller than a reference particle size in a wood powder producing apparatus for pulverizing a wood raw material into a powder form,
A receiving portion 123 formed of a screen net 121 having a plurality of wood particle discharging holes 122, a pulverized water inlet 124 communicating with one side of the receiving portion 123, A screen drum 120 having a barrel outlet 125 connected to the screen drum 120;
Rotating means (130) for rotating the screen drum (120) in one direction;
A height adjusting means 140 for adjusting the height of the screen drum 120 so as to be inclined downward from the charging port 124 toward the discharging port 125; And
A rotating shaft 151 installed to rotate in the receiving portion 123 in a direction opposite to the screen drum 120 and a brush 154 coupled to the rotating shaft 151 and contacting the inner wall of the screen net 121, And at least one second rotating powder body 155 coupled to the rotating shaft 151 and having a plurality of fan blades 157, 150, < / RTI >
The tearing means 150 includes a striking plate 158 mounted on the receiving portion 123 and striking an inner wall of the screen net 121 by swinging,
The striking plate 158 is a plate-shaped member and is elastically supported on both sides of the striking plate 158 by elastic bodies 159 connected to the screen netting 121,
The striking plate 158 is rotated about the axis of the elastic body 159 by the centrifugal force generated by the rotation of the screen drum 120 and the vibration of the brush drum 154 and the wind pressure of the blades, And the striking plate 158 directly strikes the inner wall of the screen net 121 by the swing motion to separate or separate the pulverized material that is caught in the screen net 121 or aggregated. . The method according to claim 1,
The first rotating powder 152 and the second rotating powder 155 are
Characterized in that the rear end is coupled to the rotary shaft (151) in an oblique or spiral manner so that the rear end thereof is positioned in the rotational direction of the rotary shaft (151) rather than the front end. 3. The method of claim 2,
The air blades (157)
And the rear end of the second rotary powder body (155) is connected to the second rotary powder body (155) so that the rear end thereof is positioned in the rotational direction of the rotary shaft (151) rather than the front end thereof. 4. The method according to any one of claims 1 to 3,
And a discharging unit (110) installed at a lower portion of the screen drum (120), the discharging unit comprising a screw conveyor (111) for collecting and discharging wood flour falling through sorting. .

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