JP4832413B2 - Crusher - Google Patents

Description

  The present invention relates to a pulverizer.

  As a crusher for crushing various unnecessary items such as runners and sprues that occur during the production of resin molded products, a rotating shaft is installed horizontally in a box-shaped casing and aligned in the axial direction with respect to this rotating shaft. There is a thin blade and a rough blade longer than the thin blade, and a fixed blade which is engaged with each blade along with the rotation of the rotating shaft and generates a breaking or crushing action is provided in the casing. In this type of pulverizer, a part of the casing may be opened and closed for maintenance such as cleaning around the fixed blade and removal of clogging.

  For example, with the pair of front and rear walls in the casing as fixed walls, a fulcrum shaft is provided separately for the lower left corner of the front fixed wall and the lower left corner of the rear fixed wall, and the left side of these front and rear fulcrum shafts The lower end of the wall is held in a swingable manner, and a separate fulcrum shaft is provided for the lower right corner of the front fixed wall and the lower right corner of the rear fixed wall, and the lower end of the right wall is placed between these front and rear fulcrum shafts. A structure that is held so as to be swingable is known (see, for example, Patent Document 1).

In the case of this structure, the left and right walls are openable and closable walls that can swing open and close in the direction of tilting or raising their upper ends outward. In order to give the casing a box-like rigidity, the front and rear fixed walls are connected and reinforced with tie rods.
The tie rod is disposed at a receiving position (opening limit position) that prevents over-opening when the left and right open / close walls are opened. In addition, since the base (base frame for installing the pulverizer at a predetermined height) is provided at the lower part of the fixed wall, it also has an effect of preventing the opening / closing wall from colliding with the base. Guessed.

Thus, providing the tie rod and the fulcrum shaft separately (arranging the fulcrum shaft on the inner side in the left-right direction from the tie rod) means that the fixed blade provided on the open / close wall is meshed with the coarse blade and the fine blade. It was reasoned that it was a necessary measure to make sure.
JP 2006-55797 A

As described above, the front fixed wall and the front lower end of each opening / closing wall are supported by the front fulcrum shaft, and the rear fixed wall and the rear lower end of each opening / closing wall are supported by the rear fulcrum shaft. Then, the opening and closing wall itself is in a two-point support state separated in the front-rear direction. That is, there is nothing that supports the wall center of the open / close wall (the fulcrum shaft does not pass).
However, the fixed blade provided on the open / close wall is subject to processing stress due to the breaking or crushing action of the coarse blade and fine blade throughout the entire longitudinal direction, and the open / close wall is induced to bend outwardly in the center of the wall. As a result, the processing (breaking or pulverizing) ability of the fixed blade and the rough blade or the fixed blade and the thin blade was uneven, leading to a decrease in the ability.

  In addition, the tie rod and the base underneath make it difficult to open the open / close wall sufficiently, and the fixed blade, coarse blade, and fine blade cannot be exposed sufficiently, making cleaning and maintenance difficult. There was a thing. Therefore, a structure that can remove the opening and closing wall (a structure that can be disassembled and assembled relatively easily) is required, and at the time of cleaning and maintenance, it is necessary to remove the opening and closing wall each time using this structure.

  The present invention has been made in view of the above circumstances, and can improve the strength without incurring the complexity of the structure, thereby improving the crushing ability and sufficiently opening the opening / closing wall. Thus, an object of the present invention is to provide a pulverizer capable of quickly and simplifying maintenance work.

In order to achieve the above object, the present invention has taken the following measures.
In other words, the pulverizer 1 according to the present invention has a pair of front and rear fixed walls 10 and 11 and a pair of left and right opening and closing walls 12 and 13, each having an inlet 15 at the top and a discharge 16 at the bottom. A casing 2, a rotating shaft 3 rotatably supported by the front and rear fixed walls 10 and 11 in the casing 2, a fine blade 4 provided on the rotating shaft 3, and a rough blade 5 longer than the thin blade 4. And have.

The left and right open / close walls 12 and 13 are formed with a fixed fine blade 33 that meshes with the fine blade 4 and a drop passage 28 below the fine blade 4, and a fixed coarse blade 32 that meshes with the coarse blade 5 and coarse pulverization. A coarse blade guide 35 is formed to carry the object to the insertion port 15 side, and the fixed fine blade 33 and the fixed coarse blade 32 of the left and right open / close walls 12 and 13 are engaged with the fine blade 4 and the coarse blade 5. The left and right open / close walls 12 and 13 are provided with bearing portions 36A and 36B projecting downward, respectively, and shaft through holes 37A formed in the respective bearing portions 36A and 36B. , 37B are aligned in the axial direction, and one open / close shaft 25 installed on the front and rear fixed walls 10, 11 is passed through the shaft through holes 37A, 37B directly below the rotary shaft 3 and in parallel therewith. These bearing parts 36A, 36B Lateral closing walls 12, 13 in a state that is common pivoted in closing shaft 25 is the left-right direction openably held.

In this way, the left and right opening and closing walls 12 and 13 are configured to be pivotally supported by a single opening and closing shaft 25 installed in parallel with and directly below the rotating shaft 3. It is in a state of being installed along the entire longitudinal direction.
Therefore, the left and right open / close walls 12 and 13 form a structure via the open / close shaft 25, which leads to an improvement in strength. Accordingly, the breaking action and the fine blade generated between the rough blade 5 and the fixed coarse blade 32 are achieved. Due to the crushing action that occurs between 4 and the fixed thin blade 33, the wall centers of the left and right open / close walls 12, 13 do not bend in the outward expansion direction.

As a result, the rupture or crushing ability of the coarse blade 5 and the fixed coarse blade 32 or the fine blade 4 and the fixed fine blade 33 is not uneven, and the ability is not reduced.
Two sets of the coarse blade 5, the fixed coarse blade 32, and the coarse blade guide 35 are provided at intervals along the rotary shaft 3, and the fine blade 4, the fixed fine blade 33, and the drop passage 28 are fixed in each set. Three pairs of coarse blades 32 are provided, and bearing portions 36A and 36B that protrude downward and are commonly pivotally supported by the opening and closing shaft 25 are provided on the rough blade guides 35 of the left and right opening and closing walls 12 and 13, respectively. Is formed.

Thus, if the bearing portions 36A and 36B for the opening and closing shaft 25 are provided in a state of projecting downward with respect to the rough blade guide 35 of the left and right opening and closing walls 12 and 13, the strength of the left and right opening and closing walls 12 and 13 is further increased. It will be.
In addition, the left and right open / close walls 12 and 13 are supported by the open / close shaft 25 via the bearing portions 36A and 36B in the vicinity of the occlusal position of the coarse blade 5 and the fixed coarse blade 32 where deformation stress is generated most. Therefore, it can be said that it is the most effective for preventing deformation of the left and right open / close walls 12 and 13.

Further, in the axial direction of the rotary shaft 3, the fine blades 4 are arranged on both end sides, the coarse blades 5 are arranged next to each other, and further between the coarse blade 5 and the coarse blade 5 (the center of the rotary shaft 3). ), The arrangement of the coarse blade guide 35 is also closer to the center of the rotary shaft 3, which is more suitable for improving the strength of the opening and closing walls 12 and 13.
The left and right upper and lower fixed walls 10 and 11 are detachably connected at their left and right upper portions by a pair of left and right upper bars 24, and their lower portions are detachably connected by the opening and closing shaft 25. The upper part of the casing 2 is detachably attached to the upper bar 24, and a space is formed in the casing 2 so that the upper part of the left and right open / close walls 12 and 13 can be opened below the fine blade 4 on the left and right sides and below. ing.

  In this way, by forming a predetermined space on the left and right sides and below the casing 2, a large opening angle between the left and right opening and closing walls 12 and 13 can be secured. Therefore, when the left and right opening and closing walls 12 and 13 are opened, the fixed coarse blade 32, the fixed fine blade 33, the coarse blade 5, the fine blade 4, the coarse blade guide 35, etc. can be sufficiently exposed, Cleaning and maintenance can be performed quickly and easily.

  In the pulverizer according to the present invention, the strength can be improved without causing a complicated structure, and the pulverization ability can be increased. In addition, the opening and closing wall can be sufficiently opened while simplifying the structure, so that the maintenance work can be performed quickly and easily.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 11 show an embodiment of a pulverizer 1 according to the present invention. The pulverizer 1 includes a casing 2, a rotary shaft 3 provided in a substantially horizontal state in the casing 2, and a fine blade 4 and a rough blade 5 provided on the rotary shaft 3.
The casing 2 has a pair of front and rear fixed walls 10 and 11 and a pair of left and right opening and closing walls 12 and 13 and is formed in a box shape vertically penetrating, with an inlet 15 at the top and an outlet 16 at the bottom. Are formed.

With respect to the inside of the casing 2, the rotary shaft 3 is provided so as to span between the fixed walls 10 and 11, and is rotatable by bearing portions 20 and 21 provided on the fixed walls 10 and 11. Is supposed to be retained. One fixed wall 10 is connected to a motor 23 that rotationally drives the rotary shaft 3.
In the following description, the fixed wall 10 to which the motor 23 is connected is referred to as a “front fixed wall” and the other fixed wall 11 is referred to as a “rear fixed wall”, and the front fixed wall 10 is viewed from the rear fixed wall 11. The open / close wall 12 on the left side (left side in FIG. 1) is referred to as “left open / close wall”, and the open / close wall 13 on the right side (right side in FIG. 1) is referred to as “right open / close wall”.

The front fixed wall 10 and the rear fixed wall 11 are detachably connected to each other at the upper left part and between the upper right parts by a pair of left and right upper bars 24 by bolting or the like, and the lower parts are directly below the rotary shaft 3. A single opening / closing shaft 25 installed between the front and rear fixed walls 10 and 11 so as to be parallel to each other is detachably connected by bolting or the like.
Each of the fine blade 4 and the coarse blade 5 protrudes in the radial direction on the outer peripheral surface of the rotating shaft 3 and is counterclockwise in a state where the front fixed wall 10 is viewed from the rear fixed wall 11 in the rotational direction. It is provided with the cutting edge directed in the direction of rotation). The thin blade 4 is formed with a small protrusion along the radial direction of the rotary shaft 3, and the coarse blade 5 is formed to protrude longer than the thin blade 4. The fine blade 4 and the coarse blade 5 rotate integrally with the rotary shaft 3.

As shown in FIG. 4, in the present embodiment, a plurality of the thin blades 4 continuously project around the rotating shaft 3 to form a saw blade shape, and sandwich a predetermined circumferential gap 26 (see FIG. 7) in the axial direction. However, a large number are arranged side by side, and a cylindrical (drum-type) rotary blade is formed as a whole (hereinafter, referred to as “drum-type rotary blade by the thin blade 4”).
On the other hand, the coarse blade 5 is provided at two opposite positions (180 ° position) around the rotary shaft 3 so as to exhibit a Z-shaped flat rotary blade (hereinafter referred to as “coarse blade”). 5) ".

Further, in the casing 2, the flat rotary blades by the coarse blade 5 are provided at two locations at a predetermined interval in the substantially central portion of the rotary shaft 3, and the drum-type rotary blade by the thin blade 4 is provided by the coarse blade 5. Are provided at a total of three locations on the front side and on the rear side with respect to the axial arrangement of the two rough blades 5.
The left and right open / close walls 12 and 13 have a taper that extends upward from the rotary shaft 3 to form a hopper portion 27. I am letting.

Further, the left and right opening and closing walls 12 and 13 are formed by hanging a portion narrowed down as a lower end of the hopper portion 27 at a position close to the rotating shaft 3 straightly downwardly toward the lower portion of the rotating shaft 3. The drop passage 28 corresponding to the drum type rotary blade is individually formed, and the narrow opening in the left and right direction formed at the lower end thereof is the discharge port 16 described above.
The left and right open / close walls 12 and 13 are formed in a cross-sectional shape bent in a “<” shape to form the hopper portion 27 and the drop passage 28, respectively. Ribs 29 are formed to increase the rigidity (see FIGS. 5 and 6).

Of the left and right open / close walls 12 and 13, the coarse open blade (the left open / close wall 12 in the present embodiment) on the secondary side in the direction in which the rotating coarse blade 5 passes through the hopper 27 has a coarse blade. A fixed coarse blade 32 that engages with 5 and crushes the input material, and a fixed fine blade 33 that engages with the fine blade 4 and crushes the input material more finely.
The fixed coarse blade 32 and the fixed fine blade 33 are provided with a rectangular cutout for allowing the coarse blade 5 and the fine blade 4 to pass therethrough, and the gap between the coarse blade 5 and the fine blade 4 and the inner surface of each cutout is reduced. In addition, the opening edge of each notch is quenched or formed of a hard material (special steel, tool steel, titanium, or the like), or a hard tip is fixed to the opening edge of each notch.

As described above, since the flat rotary blades using the coarse blades 5 are provided at two locations along the rotary shaft 3, the fixed coarse blades 32 are also provided at two predetermined intervals. Moreover, since the drum-type rotary blades by the thin blades 4 are provided at three locations along the rotation shaft 3, the fixed thin blades 33 are also provided at three locations at predetermined intervals.
In the present embodiment, a single strip-shaped positioning member 38 and a plate 34 divided into three along the rotation shaft 3 are respectively fixed to the upper portion of the left opening / closing wall 12 by bolts 40. The fixed thin blade 33 is formed on the lower edge facing the rotation shaft 3 of the first plate, and the fixed coarse blade 32 is formed by providing blade portions on both ends of the central plate 34 and the side ends of the front and rear plates 34 facing the central plate 34. ing.

  The plate 34 can be integrally formed without being divided into three parts, but the divided type is easier to manufacture and the fixed coarse blade 32 can be formed easily. Further, the positioning member 38 is made of different plate widths, and a shim is interposed between the left opening / closing wall 12 or the plate 34, whereby the fixed coarse blade 32 and the fixed fine blade 33 are roughened. Perspective positions can be made with respect to the blade 5 and the thin blade 4, and the biting can be adjusted.

The fixed coarse blade 32 and the fixed thin blade 33 can be removed from the left opening / closing wall 12 by loosening the bolt 40, which is convenient for replacement and maintenance.
Further, on the left and right open / close walls 12 and 13, a coarse blade guide 35 is formed so that a coarsely pulverized material generated by the engagement of the coarse blade 5 and the fixed coarse blade 32 can be carried to the inlet 15 side. . The coarse blade guide 35 is in a rotation region until the coarse blade 5 comes out of the hopper portion 27 after passing through the fixed coarse blade 32 and passes below the rotary shaft 3 and returns to the hopper portion 27. On the other hand, it is formed in a bag shape that covers it from below.

The rough blade guide 35 joins a guide half body 35A provided on the left opening / closing wall 12 and a guide half body 35B provided on the right opening / closing wall 13 in a butted manner at the center of the left and right sides of the casing 2. Formed with.
As shown in FIG. 2, the guide half body 35 </ b> A of the left opening / closing wall 12 and the guide half body 35 </ b> B of the right opening / closing wall 13 are provided with bearing portions 36 </ b> A and 36 </ b> B that protrude downward, respectively. 36A and 36B are formed with shaft through holes 37A and 37B, respectively.

With the shaft through holes 37A and 37B aligned in the axial direction, the open / close shaft 25 is penetrated in a skewered manner so that the bearing portions 36A and 36B are pivotally supported by the open / close shaft 25 (open / close shaft 25 The left and right open / close walls 12 and 13 are swingably held.
As shown in FIG. 6, a scraper 41 may be provided on the right opening / closing wall 13 instead of the plate 34 on which the fixed coarse blade 32 and the fixed thin blade 33 are formed. The scraper 41 may be integrally formed, but is divided into three parts, and a rough blade through hole 42 through which the rough blade 5 passes is formed between both side edges of the central scraper 41 and the opposite side edges of the front and rear scraper 41. A fine blade through-hole 43 through which the fine blade 4 passes is formed at the lower edge of the scraper 41.

A positioning member 38 is also arranged on the upper side of the scraper 41, and both are fixed to the right opening / closing wall 13 by bolts 44 inserted from the outside of the right opening / closing wall 13. Therefore, the scraper 41 can be adjusted in position with respect to the rotary shaft 3 and can be detached from the right opening / closing wall 13, which is convenient for replacement and maintenance.
The scraper 41 is replaced with a plate 34 on which the fixed coarse blade 32 and the fixed fine blade 33 are formed, and the rotation direction of the rotary shaft 3 is reversed by reversing the mounting direction (rotation direction) of the fine blade 4 and the coarse blade 5. It can also be used with the direction reversed.

A connecting plate 45 is fixed to the upper portions of the left and right open / close walls 12 and 13 by bolts 46. The connecting plate 45 protrudes upward to a height at which it abuts on the outer surface of the upper crosspiece 24 of the casing 2, and a lever base 47 is fixed to the protruding portion by welding or the like. Yes.
A clamp lever 48 having a male screw is rotatably held on the lever base 47, and the male screw is provided inside the left and right opening and closing walls 12 and 13 by rotating the clamp lever 48. The left and right open / close walls 12 and 13 are detachably attached to the upper bar 24 by being screwed into screw holes (not shown).

Note that the lower end portion of the connecting plate 45 protrudes downward, and a clearance for handling is formed between the side surface and the outer surface of the hopper portion 27. For this reason, when the left and right opening and closing walls 12 and 13 are opened, a hand can be put on the lower end portion of the connecting plate 45, and the operation is convenient.
As described above, the left and right open / close walls 12 and 13 have a cross-sectional “<” shape to form the hopper portion 27 and the drop passage 28, and the upper crosspiece 24 and open / close between the front and rear fixed walls 10 and 11. Except for the shaft 25, there is no member to be connected. That is, on the left and right sides of the casing 2 and below, spaces are formed so that the upper portions of the left and right opening and closing walls 12 and 13 can be opened below the thin blade 4. Has a sufficient opening.

In the crusher 1 of the present invention having such a configuration, the fine blade 4 and the coarse blade 5 are rotated in the casing 2 by rotating the rotating shaft 3 by starting the motor 23.
Therefore, when an input such as a runner or a sprue generated during the production of the resin molded product is input from the input port 15 toward the hopper portion 27, the coarse blade 5 protruding greatly draws the input into the fixed coarse blade 32. Become.

The input material is finely crushed by the engagement of the coarse blade 5 and the fixed coarse blade 32, and the crushed coarsely pulverized material is carried around the coarse blade guide 35 to the input port 15 side along with the coarse blade 5. It becomes. The coarsely pulverized product is further finely pulverized by the engagement of the fine blade 4 and the fixed fine blade 33 and is dropped and discharged from the discharge port 16 through the drop passage 28.
In the left and right open / close walls 12 and 13, the open / close shaft 25 is in contact with the entire front / rear direction. Therefore, the left and right open / close walls 12 and 13 constitute a structure via the open / close shaft 25. The strength is improved.

Further, since the bearing portions 36A and 36B for the opening / closing shaft 25 are provided in the rough blade guide 35 (the guide halves 35A and 35B in the left and right opening and closing walls 12 and 13), the strength of the left and right opening and closing walls 12 and 13 is improved. Is being raised more and more.
With respect to these bearing portions 36A and 36B, the opening and closing shaft 25 supports the vicinity of the occlusal position between the coarse blade 5 and the fixed coarse blade 32 that generate the most deformation stress with respect to the left and right opening and closing walls 12 and 13. Therefore, it can be said that it is the most effective for preventing deformation of the left and right open / close walls 12 and 13.

From these facts, the center of the wall of the left and right open / close walls 12 and 13 is caused by the breaking action generated between the coarse blade 5 and the fixed coarse blade 32 and the crushing action produced between the fine blade 4 and the fixed fine blade 33. Will not bend in the direction of outward expansion. As a result, there is no unevenness in the breaking or crushing ability, and the ability does not decrease.
After performing pulverization in this way, to perform various maintenance such as cleaning inside the casing 2 or removing clogging of the fixed coarse blade 32 and the fixed thin blade 33, after the motor 23 is stopped, the left and right opening and closing walls 12, All of the clamp levers 48 provided on 13 are pivoted to release the engaged state, the left opening / closing wall 12 is moved to the left, the right opening / closing wall 13 is moved to the right, and the opening / closing shaft 25 is used as a fulcrum. Respectively to swing open.

In the casing 2, there are no spaces on the left and right sides and below, so that the left and right open / close walls 12 and 13 have a large opening angle, so that the fixed coarse blade 32 and the fixed fine blade 33 are of course used. The rough blade 5 and the fine blade 4 can be sufficiently exposed. Therefore, cleaning and maintenance for them can be performed quickly and easily.
By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.

For example, the number of the coarse blades 5 and the fine blades 4 provided around the rotation shaft 3 (circumferential direction), the number of the coarse blades 5 and the fine blades 4 provided in the axial direction of the rotation shaft 3, the coarse blades 5 and the fine blades 4 The length in the radial direction, the blade shape, and the like can be appropriately changed according to the material and size of the input to be pulverized, the required processing capacity, the degree of pulverization (fineness), and the like.
The left and right open / close walls 12 and 13 may be divided into a plurality of parts in the front-rear direction (the pivotal support with respect to the open / close shaft 25 is coaxial).

  The material of the input material (in short, use as a pulverizer) is not limited at all.

FIG. 4 is a sectional view taken along line AA in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is the perspective view which showed one Embodiment of the grinder which concerns on this invention. It is the perspective view which showed clearly the attachment relationship of a rough blade and a thin blade, and a rotating shaft. It is the perspective view which showed the right and left opening-and-closing wall. It is the perspective view shown so that those inner surfaces might appear about a right-and-left opening-and-closing wall. It is the perspective view which showed the occlusal relationship of a thin blade and a fixed thin blade clearly. It is the arrow line view which showed the left part opening-and-closing wall seen from the arrow C direction of FIG. It is the arrow line view which showed the left part opening-and-closing wall seen from the arrow D direction of FIG. It is the EE sectional view taken on the line of FIG. It is a FF line arrow directional view of FIG.

DESCRIPTION OF SYMBOLS 1 Crusher 2 Casing 3 Rotating shaft 4 Fine blade 5 Coarse blade 10 Front fixed wall 11 Rear fixed wall 12 Left open / close wall 13 Right open / close wall 15 Input port 16 Discharge port 24 Upper beam 25 Open shaft 28 Falling passage 32 Fixed Coarse blade 33 Fixed thin blade 35 Coarse blade guide 36A, 36B Bearing

Claims (3)

A casing (2) having a pair of front and rear fixed walls (10, 11) and a pair of left and right open / close walls (12, 13), each having an inlet (15) at the top and an outlet (16) at the bottom. ), A rotating shaft (3) rotatably supported by the front and rear fixed walls (10, 11) in the casing (2), a fine blade (4) provided on the rotating shaft (3), and A coarse blade (5) longer than the fine blade (4),
The left and right open / close walls (12, 13) are formed with a fixed thin blade (33) meshing with the thin blade (4) and a drop passage (28) below the fixed blade (28), and the coarse blade (5) A fixed coarse blade (32) to be engaged and a coarse blade guide (35) to carry the coarsely pulverized product to the inlet (15) side are formed, and the fixed fine blade (12, 13) of the left and right open / close walls (12, 13) is formed. 33) and the fixed coarse blade (32) are formed so as to be able to pulverize the input by meshing with the fine blade (4) and the coarse blade (5),
The left and right open / close walls (12, 13) are respectively provided with bearing portions (36A, 36B) projecting downward, and shaft through holes (37A, 37B) formed in the respective bearing portions (36A, 36B) are shafts. One open / close shaft (25) that is aligned in the direction and is installed on the front and rear fixed walls (10, 11) in parallel to and directly below the rotary shaft (3) with respect to both shaft through holes (37A, 37B ) The left and right opening / closing walls (12, 13) are held openably and closably in the left-right direction in a state where these bearing portions (36A, 36B) are pivotally supported by the opening / closing shaft (25). And crusher. Two sets of the coarse blade (5), the fixed coarse blade (32), and the coarse blade guide (35) are provided at intervals along the rotation axis (3), and the fine blade (4), the fixed fine blade (33) and three sets of drop passages (28) are provided so as to sandwich each set of fixed coarse blades (32),
A pair of coarse blade guides (35) of the left and right open / close walls (12, 13) are formed with bearing portions (36A, 36B) that protrude downward and are pivotally supported by the open / close shaft (25). The pulverizer according to claim 1. The left and right upper portions of the front and rear fixed walls (10, 11) are detachably connected by a pair of left and right upper bars (24), and the lower portions are detachably connected by the opening / closing shaft (25),
The left and right open / close walls (12, 13) are detachably mounted at the upper part thereof on the upper beam (24),
The left and right sides and the lower side of the casing (2) are formed with spaces that allow the upper part of the left and right open / close walls (12, 13) to be opened below the fine blade (4). The pulverizer according to claim 1 or 2.

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